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Merge from eCos master repository on 2001-02-12-23:44:24-GMT
author jlarmour
date Tue, 13 Feb 2001 01:23:16 +0000
parents 6b5f480c6929
children f935b880e96c
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1 //==========================================================================
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2 //
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3 // signal.cxx
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4 //
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5 // POSIX signal functions implementation
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6 //
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7 //==========================================================================
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8 //####COPYRIGHTBEGIN####
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9 //
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10 // -------------------------------------------
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11 // The contents of this file are subject to the Red Hat eCos Public License
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12 // Version 1.1 (the "License"); you may not use this file except in
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13 // compliance with the License. You may obtain a copy of the License at
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14 // http://www.redhat.com/
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15 //
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16 // Software distributed under the License is distributed on an "AS IS"
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17 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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18 // License for the specific language governing rights and limitations under
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19 // the License.
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20 //
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21 // The Original Code is eCos - Embedded Configurable Operating System,
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22 // released September 30, 1998.
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23 //
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24 // The Initial Developer of the Original Code is Red Hat.
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25 // Portions created by Red Hat are
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26 // Copyright (C) 1998, 1999, 2000 Red Hat, Inc.
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27 // All Rights Reserved.
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28 // -------------------------------------------
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29 //
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30 //####COPYRIGHTEND####
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31 //==========================================================================
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32 //#####DESCRIPTIONBEGIN####
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33 //
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34 // Author(s): nickg
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35 // Contributors: nickg
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36 // Date: 2000-03-27
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37 // Purpose: POSIX signal functions implementation
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38 // Description: This file contains the implementation of the POSIX signal
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39 // functions.
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40 //
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41 //
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42 //
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43 //####DESCRIPTIONEND####
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44 //
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45 //==========================================================================
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46
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47 #include <pkgconf/posix.h>
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48
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49 #ifdef CYGPKG_POSIX_SIGNALS
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50
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51 #include <pkgconf/hal.h>
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52 #include <pkgconf/kernel.h>
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53 #include <pkgconf/isoinfra.h>
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54
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55 #include <cyg/kernel/ktypes.h> // base kernel types
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56 #include <cyg/infra/cyg_trac.h> // tracing macros
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57 #include <cyg/infra/cyg_ass.h> // assertion macros
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58
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59 #include "pprivate.h" // POSIX private header
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60
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61 #include <signal.h> // our header
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62 #include <setjmp.h>
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63 #include <unistd.h> // _exit
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64
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65 #include <cyg/kernel/clock.hxx>
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66
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67 #include <cyg/kernel/clock.inl>
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68
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69 // -------------------------------------------------------------------------
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70 // Internal definitions
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71
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72 // Handle entry to a signal package function.
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73 #define SIGNAL_ENTRY() CYG_REPORT_FUNCTYPE( "returning %d" );
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74
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75 // Do a signal package defined return. This requires the error code
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76 // to be placed in errno, and if it is non-zero, -1 returned as the
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77 // result of the function. This also gives us a place to put any
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78 // generic tidyup handling needed for things like signal delivery and
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79 // cancellation.
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80 #define SIGNAL_RETURN(err) \
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81 CYG_MACRO_START \
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82 int __retval = 0; \
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83 if( err != 0 ) __retval = -1, errno = err; \
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84 CYG_REPORT_RETVAL( __retval ); \
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85 return __retval; \
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86 CYG_MACRO_END
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87
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88 // Similarly for functions that have valid non-zero returns
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89 #define SIGNAL_RETURN_VALUE(val) \
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90 CYG_MACRO_START \
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91 CYG_REPORT_RETVAL( val ); \
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92 return val; \
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93 CYG_MACRO_END
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94
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95 // Range check on a signal value.
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96 #define SIGNAL_VALID(_sig_) (((_sig_) > 0) && ((_sig_) < ((int)sizeof(sigset_t)*8)))
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97
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98 //==========================================================================
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99 // Signal management structures
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100
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101 typedef struct signal_info
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102 {
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103 struct signal_info *next; // link in list of pending signals
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104 siginfo_t si; // siginfo to pass to handler
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105 } signal_info;
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106
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107 typedef struct
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108 {
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109 struct sigaction sa; // Sigaction defining what to do
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110 signal_info *pending; // List of pending signals - this is
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111 // a circular list with pending pointing
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112 // to the tail element (or NULL if empty).
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113 } signal_state;
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114
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115 //==========================================================================
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116 // Signal management variables
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117
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118 // Lock used to protect signal management structures
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119 Cyg_Mutex signal_mutex CYGBLD_POSIX_INIT;
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120
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121 // Condition variable for all threads in sigsuspend() and sigwait()
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122 // to wait on.
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123 Cyg_Condition_Variable signal_sigwait( signal_mutex ) CYGBLD_POSIX_INIT;
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124
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125 // Global pending signal set
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126 sigset_t sig_pending;
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127
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128 // Array controlling signal states
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129 static signal_state sigstate[sizeof(sigset_t)*8];
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130
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131 // Array of available signal_info objects for queueing signals
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132 static signal_info siginfo[SIGQUEUE_MAX];
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133
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134 // List of free signal_info objects
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135 static signal_info *siginfo_next = NULL;
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136
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137 //==========================================================================
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138 // Variables used to support alarm()
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139
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140 // Forward def of action function
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141 static void sigalrm_action( Cyg_Alarm *alarm, CYG_ADDRWORD data );
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142
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143 // Kernel alarm object
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144 static Cyg_Alarm sigalrm_alarm( Cyg_Clock::real_time_clock, sigalrm_action, 0 ) CYGBLD_POSIX_INIT;
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145
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146 // Set true when alarm is armed
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147 volatile cyg_bool sigalrm_armed = false;
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148
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149 // Set true when alarm has fired and is waiting to be delivered
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150 volatile cyg_bool sigalrm_pending = false;
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151
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152 //==========================================================================
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153 // Implementation functions.
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154 // These are where the real work of the signal mechanism gets done.
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155
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156 externC void cyg_posix_signal_start()
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157 {
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158 // Chain all free signal_info objects together
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159 for( int i = 0; i < SIGQUEUE_MAX; i++ )
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160 {
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161 siginfo[i].next = siginfo_next;
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162 siginfo_next = &siginfo[i];
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163 }
134
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164
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165 // initialize all signal actions to SIG_DFL
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166 for ( unsigned int i=0; i<(sizeof(sigstate)/sizeof(signal_state)); i++ )
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167 {
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168 sigstate[i].sa.sa_handler = SIG_DFL;
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169 }
115
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170
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171 // Clear the pending signal set
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172 sigemptyset( &sig_pending );
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173 }
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174
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175 // -------------------------------------------------------------------------
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176 // Generate a signal
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177
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178 cyg_bool cyg_sigqueue( const struct sigevent *sev, int code,
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179 pthread_info *thread )
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180 {
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181 if( sev->sigev_notify == SIGEV_NONE )
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182 {
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183 // Do nothing
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184 return true;
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185 }
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186
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187 if( sev->sigev_notify == SIGEV_THREAD )
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188 {
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189 // create a thread to run the notification
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190 // function.
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191 // FIXME: implement SIGEV_THREAD
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192 return true;
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193 }
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194
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195 // Otherwise we must have a SIGEV_SIGNAL notification
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196
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197 // Find out whether the current thread already has the mutex
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198 // locked. This is a distinct possibility if this function is
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199 // called from the ASR while exiting the signal_sigwait condvar in
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200 // pause() and sigtimedwait().
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201
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202 pthread_info *self = pthread_self_info();
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203 cyg_bool locked = (self != NULL) && (signal_mutex.get_owner() == self->thread);
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204
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205 // Lock the mutex only if we do not already own it
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206 if( !locked ) signal_mutex.lock();
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207
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208 int signo = sev->sigev_signo;
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209 signal_state *ss = &sigstate[signo];
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210
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211 if( ss->sa.sa_flags & SA_SIGINFO )
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212 {
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213 // We have a queuable signal, allocate a signal_info
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214 // object and add it to the queue.
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215
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216 if( siginfo_next == NULL )
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217 {
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218 if( !locked ) signal_mutex.unlock();
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219 return false;
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220 }
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221
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222 signal_info *si = siginfo_next;
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223 siginfo_next = si->next;
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224
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225 si->si.si_signo = signo;
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226 si->si.si_code = code;
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227 si->si.si_value = sev->sigev_value;
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228
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229 if( ss->pending == NULL )
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230 {
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231 si->next = si;
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232 }
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233 else
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234 {
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235 si->next = ss->pending->next;
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236 ss->pending->next = si;
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237 }
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238
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239 ss->pending = si;
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240 }
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241 // else A non-queuable signal, just set it pending
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242
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243 if( thread != NULL )
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244 sigaddset( &thread->sigpending, signo );
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245 else sigaddset( &sig_pending, signo );
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246
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247 // Wake up any threads in sigsuspend() and sigwait().
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248 signal_sigwait.broadcast();
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249
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250 if( !locked ) signal_mutex.unlock();
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251
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252 return true;
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253 }
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254
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255 // -------------------------------------------------------------------------
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256 // Deliver any pending unblocked signals to the current thread
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257 // Returns true if a signal handler was called.
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258
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259 cyg_bool cyg_deliver_signals()
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260 {
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261 cyg_bool res = false;
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262
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263 pthread_info *self = pthread_self_info();
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264
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265 // If there is no pthread_info pointer for this thread then
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266 // it is not a POSIX thread and cannot have signals delivered
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267 // to it.
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268
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269 if( self == NULL ) return false;
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270
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271 // If there are no pending signals our work is done
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272 if( sig_pending == 0 && self->sigpending == 0 )
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273 return false;
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274
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275 // If there are no unmasked pending signals our
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276 // work is also done
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277 if( ((sig_pending | self->sigpending) & ~self->sigmask) == 0 )
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278 return false;
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279
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280 // As with cyg_sigqueue(), this function can get called from an
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281 // ASR where the signal_mutex is already locked. Check here to
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282 // avoid relocking...
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283
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284 cyg_bool locked = signal_mutex.get_owner() == self->thread;
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285
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286 if( !locked ) signal_mutex.lock();
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287
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288 sigset_t todo;
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289
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290 // Since a signal handler may raise another signal, or unmask an existing
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291 // signal, we loop here while there are no more unblocked signals pending.
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292 while( (todo = ((sig_pending | self->sigpending) & ~self->sigmask)) != 0 )
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293 {
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294 // Here todo is a mask of the signals available for delivery
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295
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296 int signo = 0;
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297
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298 // This prioritizes low numbered signals
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299 HAL_LSBIT_INDEX( signo, todo );
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300
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301 signal_state *ss = &sigstate[signo];
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302 sigset_t sigbit = 1L<<signo;
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303
134
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304 if( ss->sa.sa_handler != SIG_IGN )
115
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305 {
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306 sigset_t oldmask = self->sigmask;
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307 siginfo_t lsi;
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308
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309 if(ss->pending != NULL)
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310 {
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311 // There is a queued signal. Dequeue it and copy the
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312 // siginfo object to a local copy.
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313
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314 signal_info *si = ss->pending->next;
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315
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316 // Make a local copy of the siginfo object
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317 lsi = si->si;
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318
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319 // Remove the head signal_info object from the
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320 // circular list.
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321 if( ss->pending == si )
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322 ss->pending = NULL;
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323 else
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324 ss->pending->next = si->next;
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325
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326 // Return it to the free list
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327 si->next = siginfo_next;
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328 siginfo_next = si;
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329 }
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330 else
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331 {
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332 // There are no signals queued. Set up the local siginfo_t
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333 // object with default values.
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334
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335 lsi.si_signo = signo;
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336 lsi.si_code = SI_USER;
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337 lsi.si_value.sival_int = 0;
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338 }
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339
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340 // Clear the bit from the pending masks. If the pending
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341 // queue is not empty, leave the bits set, otherwise clear
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342 // them. Do this now so that if the signal handler longjumps
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343 // out, the signal subsystem is clean.
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344
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345 if( ss->pending == NULL )
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346 {
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347 // Clear the bit in both masks regardless of which
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348 // one it actually came from. This is cheaper than
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349 // trying to find out.
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350 sig_pending &= ~sigbit;
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351 self->sigpending &= ~sigbit;
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352 }
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353
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354 // Add the mask set and the signal itself to the
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355 // mask while we call the signal handler
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356 self->sigmask = oldmask | ss->sa.sa_mask | sigbit;
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357
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358 // Unlock now so that a longjmp out of the handler
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359 // does the right thing. We do this even if we did not
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360 // lock the mutex since it will only recently have been
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361 // relocked and thus all data is still consistent.
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362
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363 signal_mutex.unlock();
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364
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365 if( ss->sa.sa_flags & SA_SIGINFO )
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366 {
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367 // A sigaction delivery
134
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368 CYG_CHECK_FUNC_PTR( ss->sa.sa_sigaction,
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369 "Bad sa_sigaction signal handler" );
115
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370 ss->sa.sa_sigaction( signo, &lsi, NULL );
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371 }
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372 else if ( ss->sa.sa_handler == SIG_DFL )
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373 {
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374 // FIXME: should do something better here
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375 #if CYGINT_ISO_EXIT
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376 _exit( -signo );
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377 #endif
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378 CYG_FAIL("Unhandled POSIX signal");
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379 }
115
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380 else
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381 {
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382 // This is a standard signal delivery.
134
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383 CYG_CHECK_FUNC_PTR( ss->sa.sa_handler,
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384 "Bad sa_handler signal handler" );
115
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385
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386 ss->sa.sa_handler( signo );
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387 }
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388
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389 // Relock the mutex
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390 signal_mutex.lock();
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391
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392 // Restore original signal mask
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393 self->sigmask = oldmask;
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394
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395 // return that we have handled a signal
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396 res = true;
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397 }
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398 }
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399
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400 if( !locked ) signal_mutex.unlock();
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401
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402 return res;
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403 }
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404
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405 // -------------------------------------------------------------------------
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406 // Action routine called from kernel alarm to deliver the SIGALRM signal.
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407 // We cannot call any signal delivery functions directly here, so we simply
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408 // set a flag and schedule an ASR to be called.
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409
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410 static void sigalrm_action( Cyg_Alarm *alarm, CYG_ADDRWORD data )
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411 {
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412 sigset_t mask;
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413 sigalrm_armed = false;
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414 sigalrm_pending = true;
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415 sigemptyset( &mask );
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416 sigaddset( &mask, SIGALRM );
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417 // Wake up any threads in sigsuspend() and sigwait() in case they
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418 // are waiting for an alarm, and would have SIGALRM masked
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419 signal_sigwait.broadcast();
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420
115
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421 cyg_posix_pthread_release_thread( &mask );
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422 }
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423
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424 // -------------------------------------------------------------------------
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425 // Check for SIGALRMs. This is called from the ASR and sigtimedwait()
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426 // as alarms need to be handled as a special case.
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427
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428 static __inline__ void check_sigalarm(void)
115
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429 {
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430 // If there is a pending SIGALRM, generate it
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431 if( sigalrm_pending )
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432 {
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433 sigalrm_pending = false;
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434
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435 struct sigevent sev;
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436
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437 sev.sigev_notify = SIGEV_SIGNAL;
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438 sev.sigev_signo = SIGALRM;
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439 sev.sigev_value.sival_int = 0;
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440
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441 // generate the signal
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442 cyg_sigqueue( &sev, SI_USER );
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443 }
134
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444 }
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445
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446 // -------------------------------------------------------------------------
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447 // signal ASR function. This is called from the general POSIX ASR to
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448 // deal with any signal related issues.
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449
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450 externC void cyg_posix_signal_asr(pthread_info *self)
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451 {
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452 check_sigalarm();
115
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453
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454 // Now call cyg_deliver_signals() to see if we can
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455 // handle any signals now.
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456
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457 cyg_deliver_signals();
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458 }
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459
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460 //==========================================================================
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461 // Per-thread initialization and destruction
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462
136
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463 externC void cyg_posix_thread_siginit( pthread_info *thread,
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464 pthread_info *parentthread )
115
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465 {
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466 // Clear out signal masks
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467 sigemptyset( &thread->sigpending );
136
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468 // but threads inherit signal masks
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469 if ( NULL == parentthread )
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470 sigemptyset( &thread->sigmask );
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471 else
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472 thread->sigmask = parentthread->sigmask;
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473
115
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474 cyg_pthread_exception_init( thread );
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475 }
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476
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477 externC void cyg_posix_thread_sigdestroy( pthread_info *thread )
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478 {
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479 cyg_pthread_exception_destroy( thread );
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480 }
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481
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482 //==========================================================================
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483 // Functions to generate signals
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484
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485 // -------------------------------------------------------------------------
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486 // Deliver sig to a process.
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487 // eCos only supports the value 0 for pid.
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488
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489 externC int kill (pid_t pid, int sig)
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490 {
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491 SIGNAL_ENTRY();
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492
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493 if( !SIGNAL_VALID(sig) )
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494 SIGNAL_RETURN(EINVAL);
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495
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496 if( pid != 0 )
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497 SIGNAL_RETURN(ESRCH);
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498
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499 struct sigevent sev;
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500
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501 sev.sigev_notify = SIGEV_SIGNAL;
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502 sev.sigev_signo = sig;
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503 sev.sigev_value.sival_int = 0;
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504
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505 cyg_sigqueue( &sev, SI_USER );
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506
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507 cyg_deliver_signals();
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508
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509 SIGNAL_RETURN(0);
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510 }
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511
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512 // -------------------------------------------------------------------------
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513
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514 externC int pthread_kill (pthread_t threadid, int sig)
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515 {
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516 SIGNAL_ENTRY();
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517
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518 if( !SIGNAL_VALID(sig) )
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519 SIGNAL_RETURN(EINVAL);
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520
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521 struct sigevent sev;
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522
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523 pthread_info *thread = pthread_info_id(threadid);
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524
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525 if( thread == NULL )
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526 SIGNAL_RETURN(ESRCH);
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527
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528 sev.sigev_notify = SIGEV_SIGNAL;
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529 sev.sigev_signo = sig;
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530 sev.sigev_value.sival_int = 0;
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531
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532 cyg_sigqueue( &sev, SI_USER, thread );
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533
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534 cyg_deliver_signals();
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535
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536 SIGNAL_RETURN(0);
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537 }
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538
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539 //==========================================================================
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540 // Functions to catch signals
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541
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542 // -------------------------------------------------------------------------
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543 // Install signal handler for sig.
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544
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545 externC int sigaction (int sig, const struct sigaction *act,
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546 struct sigaction *oact)
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547 {
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548 SIGNAL_ENTRY();
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549
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550 if( !SIGNAL_VALID(sig) )
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551 SIGNAL_RETURN(EINVAL);
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552
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553 signal_state *ss = &sigstate[sig];
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554
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555 signal_mutex.lock();
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556
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557 if( oact != NULL )
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558 *oact = ss->sa;
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559
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560 ss->sa = *act;
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561
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562 if( ss->sa.sa_handler == SIG_IGN )
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563 {
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564 // Setting the handler to SIG_IGN causes any pending
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565 // signals to be discarded and any queued values to also
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566 // be removed.
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567
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568 pthread_info *self = pthread_self_info();
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569 sigset_t sigbit = 1<<sig;
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570
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571 if( (sig_pending | self->sigpending) & sigbit )
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572 {
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573 // This signal is pending, clear it
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574
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575 sig_pending &= ~sigbit;
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576 self->sigpending &= ~sigbit;
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577
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578 // Clean out any queued signal_info objects
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579 while( ss->pending != NULL )
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580 {
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diff changeset
581 signal_info *si = ss->pending->next;
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diff changeset
582
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diff changeset
583 // Remove the head signal_info object from the
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diff changeset
584 // circular list.
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diff changeset
585 if( ss->pending == si )
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586 ss->pending = NULL;
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587 else
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588 ss->pending->next = si->next;
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589
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diff changeset
590 // Return it to the free list
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591 si->next = siginfo_next;
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592 siginfo_next = si;
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593 }
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594 }
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595 }
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diff changeset
596
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597 cyg_deliver_signals();
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598
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diff changeset
599 signal_mutex.unlock();
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600
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601 SIGNAL_RETURN(0);
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diff changeset
602 }
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603
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604
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diff changeset
605 // -------------------------------------------------------------------------
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diff changeset
606 // Queue signal to process with value.
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607
134
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608 externC int sigqueue (pid_t pid, int sig, const union sigval value)
115
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609 {
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610 SIGNAL_ENTRY();
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611
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612 if( !SIGNAL_VALID(sig) )
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diff changeset
613 SIGNAL_RETURN(EINVAL);
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614
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615 struct sigevent sev;
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616
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617 sev.sigev_notify = SIGEV_SIGNAL;
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618 sev.sigev_signo = sig;
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diff changeset
619 sev.sigev_value = value;
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620
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621 cyg_sigqueue( &sev, SI_QUEUE );
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622
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623 cyg_deliver_signals();
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624
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625 SIGNAL_RETURN(0);
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626 }
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627
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628 //==========================================================================
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diff changeset
629 // Functions to deal with current blocked and pending masks
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diff changeset
630
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631 // -------------------------------------------------------------------------
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632 // Set process blocked signal mask
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633 // Map this onto pthread_sigmask().
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634
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635 externC int sigprocmask (int how, const sigset_t *set, sigset_t *oset)
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636 {
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637 return pthread_sigmask( how, set, oset);
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638 }
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639
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640
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641 // -------------------------------------------------------------------------
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diff changeset
642 // Set calling thread's blocked signal mask
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643
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644 externC int pthread_sigmask (int how, const sigset_t *set, sigset_t *oset)
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645 {
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646 int err = 0;
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647
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648 SIGNAL_ENTRY();
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649
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650 pthread_info *self = pthread_self_info();
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651
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652 // Save old set
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653 if( oset != NULL )
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654 *oset = self->sigmask;
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655
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656 if( set != NULL )
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657 {
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658 switch( how )
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659 {
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660 case SIG_BLOCK:
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661 self->sigmask |= *set;
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662 break;
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663
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664 case SIG_UNBLOCK:
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665 self->sigmask &= ~*set;
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666 break;
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667
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668 case SIG_SETMASK:
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669 self->sigmask = *set;
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670 break;
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671
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672 default:
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673 err = EINVAL;
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674 break;
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675 }
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676 }
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diff changeset
677
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678 // Deliver any newly unblocked signals
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679 cyg_deliver_signals();
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680
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681 SIGNAL_RETURN(err);
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682 }
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683
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diff changeset
684 // -------------------------------------------------------------------------
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685 // Get set of pending signals for this process
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diff changeset
686
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687 externC int sigpending (sigset_t *set)
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jlarmour
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diff changeset
688 {
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diff changeset
689 SIGNAL_ENTRY();
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diff changeset
690
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691 if( set == NULL )
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diff changeset
692 SIGNAL_RETURN(EINVAL);
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diff changeset
693
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diff changeset
694 pthread_info *self = pthread_self_info();
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diff changeset
695
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696 *set = self->sigpending | sig_pending;
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diff changeset
697
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diff changeset
698 SIGNAL_RETURN(0);
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diff changeset
699 }
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diff changeset
700
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diff changeset
701
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diff changeset
702 //==========================================================================
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diff changeset
703 // Wait for or accept signals
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diff changeset
704
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705 // -------------------------------------------------------------------------
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diff changeset
706 // Block signals in set and wait for a signal
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parents:
diff changeset
707
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jlarmour
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diff changeset
708 externC int sigsuspend (const sigset_t *set)
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diff changeset
709 {
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diff changeset
710 SIGNAL_ENTRY();
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jlarmour
parents:
diff changeset
711
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jlarmour
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diff changeset
712 pthread_info *self = pthread_self_info();
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diff changeset
713
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diff changeset
714 signal_mutex.lock();
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diff changeset
715
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716 // Save the old mask and set the current mask to
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jlarmour
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diff changeset
717 // the one supplied.
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718 sigset_t old = self->sigmask;
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719 self->sigmask = *set;
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diff changeset
720
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diff changeset
721 // Loop until a signal gets delivered
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diff changeset
722 while( !cyg_deliver_signals() )
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diff changeset
723 signal_sigwait.wait();
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diff changeset
724
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725 self->sigmask = old;
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diff changeset
726
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727 signal_mutex.unlock();
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diff changeset
728
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diff changeset
729 SIGNAL_RETURN(EINTR);
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730 }
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diff changeset
731
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jlarmour
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diff changeset
732
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jlarmour
parents:
diff changeset
733 // -------------------------------------------------------------------------
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jlarmour
parents:
diff changeset
734 // Wait for a signal in set to arrive
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jlarmour
parents:
diff changeset
735 // Implement this as a variant on sigtimedwait().
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
736
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jlarmour
parents:
diff changeset
737 externC int sigwait (const sigset_t *set, int *sig)
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
738 {
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jlarmour
parents:
diff changeset
739 SIGNAL_ENTRY();
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jlarmour
parents:
diff changeset
740
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jlarmour
parents:
diff changeset
741 siginfo_t info;
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jlarmour
parents:
diff changeset
742
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jlarmour
parents:
diff changeset
743 int ret = sigtimedwait( set, &info, NULL );
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jlarmour
parents:
diff changeset
744
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jlarmour
parents:
diff changeset
745 if( ret == -1 )
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jlarmour
parents:
diff changeset
746 SIGNAL_RETURN(errno);
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jlarmour
parents:
diff changeset
747
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jlarmour
parents:
diff changeset
748 *sig = ret;
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jlarmour
parents:
diff changeset
749
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jlarmour
parents:
diff changeset
750 SIGNAL_RETURN(0);
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jlarmour
parents:
diff changeset
751 }
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jlarmour
parents:
diff changeset
752
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jlarmour
parents:
diff changeset
753 // -------------------------------------------------------------------------
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jlarmour
parents:
diff changeset
754 // Do the same as sigwait() except return a siginfo_t object too.
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
755 // Implement this as a variant on sigtimedwait().
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
756
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jlarmour
parents:
diff changeset
757 externC int sigwaitinfo (const sigset_t *set, siginfo_t *info)
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
758 {
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jlarmour
parents:
diff changeset
759 SIGNAL_ENTRY();
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jlarmour
parents:
diff changeset
760
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jlarmour
parents:
diff changeset
761 int ret = sigtimedwait( set, info, NULL );
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parents:
diff changeset
762
134
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parents: 130
diff changeset
763 SIGNAL_RETURN_VALUE(ret);
115
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jlarmour
parents:
diff changeset
764 }
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jlarmour
parents:
diff changeset
765
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jlarmour
parents:
diff changeset
766 // -------------------------------------------------------------------------
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jlarmour
parents:
diff changeset
767 // Wait either for a signal in the given set to become pending, or
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
768 // for the timeout to expire. If timeout is NULL, wait for ever.
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jlarmour
parents:
diff changeset
769
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jlarmour
parents:
diff changeset
770 externC int sigtimedwait (const sigset_t *set, siginfo_t *info,
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
771 const struct timespec *timeout)
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jlarmour
parents:
diff changeset
772 {
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
773 SIGNAL_ENTRY();
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jlarmour
parents:
diff changeset
774
151
25e238959bae Merge from eCos master repository on 2001-02-12-23:44:24-GMT
jlarmour
parents: 143
diff changeset
775 // check for cancellation first.
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jlarmour
parents: 143
diff changeset
776 pthread_testcancel();
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jlarmour
parents: 143
diff changeset
777
115
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jlarmour
parents:
diff changeset
778 int err = 0;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
779 cyg_tick_count ticks;
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jlarmour
parents:
diff changeset
780
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jlarmour
parents:
diff changeset
781 if( timeout == NULL ) ticks = 0;
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jlarmour
parents:
diff changeset
782 else ticks = cyg_timespec_to_ticks( timeout ) +
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
783 Cyg_Clock::real_time_clock->current_value();
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jlarmour
parents:
diff changeset
784
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jlarmour
parents:
diff changeset
785 pthread_info *self = pthread_self_info();
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jlarmour
parents:
diff changeset
786
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jlarmour
parents:
diff changeset
787 signal_mutex.lock();
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jlarmour
parents:
diff changeset
788
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
789 sigset_t todo;
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jlarmour
parents:
diff changeset
790
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
791 // Wait for a signal in the set to become pending
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
792 while( (todo = (*set & (sig_pending | self->sigpending))) == 0 )
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
793 {
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jlarmour
parents:
diff changeset
794 // If timeout is not NULL, do a timed wait on the
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
795 // sigwait condition variable. If it is NULL - wait
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
796 // until we are woken.
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
797 if( timeout )
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
798 {
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
799 if( ticks == 0 || !signal_sigwait.wait(ticks) )
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
800 {
151
25e238959bae Merge from eCos master repository on 2001-02-12-23:44:24-GMT
jlarmour
parents: 143
diff changeset
801 // first check we weren't woken up to be cancelled
25e238959bae Merge from eCos master repository on 2001-02-12-23:44:24-GMT
jlarmour
parents: 143
diff changeset
802 pthread_testcancel_unlock( (pthread_mutex_t *)&signal_mutex );
25e238959bae Merge from eCos master repository on 2001-02-12-23:44:24-GMT
jlarmour
parents: 143
diff changeset
803
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
804 // If the timeout is actually zero, or we have waited and
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
805 // timed out, then we must quit with an error.
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
806 err = EAGAIN;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
807 break;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
808 }
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
809 }
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
810 else signal_sigwait.wait();
134
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jlarmour
parents: 130
diff changeset
811
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jlarmour
parents: 130
diff changeset
812 // Special case check for SIGALRM since the fact SIGALRM is masked
d2f49caf9e38 Merge from eCos master repository on 2000-11-03-09:00:49-GMT
jlarmour
parents: 130
diff changeset
813 // would have prevented it being set pending in the alarm handler.
d2f49caf9e38 Merge from eCos master repository on 2000-11-03-09:00:49-GMT
jlarmour
parents: 130
diff changeset
814 check_sigalarm();
151
25e238959bae Merge from eCos master repository on 2001-02-12-23:44:24-GMT
jlarmour
parents: 143
diff changeset
815
25e238959bae Merge from eCos master repository on 2001-02-12-23:44:24-GMT
jlarmour
parents: 143
diff changeset
816 // check we weren't woken up to be cancelled
25e238959bae Merge from eCos master repository on 2001-02-12-23:44:24-GMT
jlarmour
parents: 143
diff changeset
817 pthread_testcancel_unlock( (pthread_mutex_t *)&signal_mutex );
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
818 }
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jlarmour
parents:
diff changeset
819
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
820 if( err == 0 )
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
821 {
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
822 // There is a signal in the set that is pending: deliver
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
823 // it. todo contains a mask of all the signals that could be
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
824 // delivered now, but we only want to deliver one of them.
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
825
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
826 int signo = 0;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
827
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
828 // Select the lowest numbered signal from the todo mask
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
829 HAL_LSBIT_INDEX( signo, todo );
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
830
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
831 signal_state *ss = &sigstate[signo];
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
832 sigset_t sigbit = 1L<<signo;
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jlarmour
parents:
diff changeset
833
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
834 if( (ss->sa.sa_flags & SA_SIGINFO) && (ss->pending != NULL) )
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
835 {
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
836 // If the SA_SIGINFO bit is set, then there
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
837 // will be a signal_info object queued on the
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
838 // pending field.
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
839
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
840 signal_info *si = ss->pending->next;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
841 *info = si->si;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
842
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
843 // Remove the head signal_info object from the
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
844 // circular list.
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
845 if( ss->pending == si )
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
846 ss->pending = NULL;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
847 else
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
848 ss->pending->next = si->next;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
849
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
850 si->next = siginfo_next;
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jlarmour
parents:
diff changeset
851 siginfo_next = si;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
852
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
853 }
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
854 else
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
855 {
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
856 // Not a queued signal, or there is no signal_info object
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
857 // on the pending queue: fill in info structure with
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
858 // default values.
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
859 info->si_signo = signo;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
860 info->si_code = SI_USER;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
861 info->si_value.sival_int = 0;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
862 }
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
863
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
864 // Clear the bit from the pending masks. If the pending
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
865 // queue is not empty, leave the bits set, otherwise clear
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
866 // them.
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
867
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
868 if( ss->pending == NULL )
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
869 {
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
870 // Clear the bit in both masks regardless of which
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
871 // one it actually came from. This is cheaper than
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
872 // trying to find out.
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
873 sig_pending &= ~sigbit;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
874 self->sigpending &= ~sigbit;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
875 }
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
876
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
877 // all done
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
878 }
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jlarmour
parents:
diff changeset
879
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jlarmour
parents:
diff changeset
880 signal_mutex.unlock();
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parents:
diff changeset
881
134
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parents: 130
diff changeset
882 if (err)
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parents: 130
diff changeset
883 SIGNAL_RETURN(err);
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diff changeset
884 else
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parents: 130
diff changeset
885 SIGNAL_RETURN_VALUE( info->si_signo );
115
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parents:
diff changeset
886 }
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jlarmour
parents:
diff changeset
887
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
888 //==========================================================================
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jlarmour
parents:
diff changeset
889 // alarm, pause and sleep
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jlarmour
parents:
diff changeset
890
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jlarmour
parents:
diff changeset
891 // -------------------------------------------------------------------------
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jlarmour
parents:
diff changeset
892 // Generate SIGALRM after some number of seconds
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jlarmour
parents:
diff changeset
893
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jlarmour
parents:
diff changeset
894 externC unsigned int alarm( unsigned int seconds )
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jlarmour
parents:
diff changeset
895 {
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jlarmour
parents:
diff changeset
896 int res = 0;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
897 struct timespec tv;
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jlarmour
parents:
diff changeset
898 cyg_tick_count trigger, interval;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
899
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jlarmour
parents:
diff changeset
900 SIGNAL_ENTRY();
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jlarmour
parents:
diff changeset
901
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jlarmour
parents:
diff changeset
902 signal_mutex.lock();
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jlarmour
parents:
diff changeset
903
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jlarmour
parents:
diff changeset
904 if( sigalrm_armed )
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jlarmour
parents:
diff changeset
905 {
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jlarmour
parents:
diff changeset
906 sigalrm_alarm.disable();
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jlarmour
parents:
diff changeset
907
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jlarmour
parents:
diff changeset
908 sigalrm_alarm.get_times( &trigger, &interval );
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
909
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jlarmour
parents:
diff changeset
910 // Convert trigger time back to interval
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jlarmour
parents:
diff changeset
911 trigger -= Cyg_Clock::real_time_clock->current_value();
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
912
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jlarmour
parents:
diff changeset
913 cyg_ticks_to_timespec( trigger, &tv );
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jlarmour
parents:
diff changeset
914
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jlarmour
parents:
diff changeset
915 res = tv.tv_sec;
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jlarmour
parents:
diff changeset
916
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jlarmour
parents:
diff changeset
917 sigalrm_armed = false;
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jlarmour
parents:
diff changeset
918 }
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jlarmour
parents:
diff changeset
919
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jlarmour
parents:
diff changeset
920 if( seconds != 0 )
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jlarmour
parents:
diff changeset
921 {
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jlarmour
parents:
diff changeset
922 // Here we know that the sigalrm_alarm is unarmed, set it up
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jlarmour
parents:
diff changeset
923 // to trigger in the required number of seconds.
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jlarmour
parents:
diff changeset
924
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jlarmour
parents:
diff changeset
925 tv.tv_sec = seconds;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
926 tv.tv_nsec = 0;
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jlarmour
parents:
diff changeset
927
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jlarmour
parents:
diff changeset
928 trigger = cyg_timespec_to_ticks( &tv );
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
929
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jlarmour
parents:
diff changeset
930 // Convert trigger interval to absolute time
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jlarmour
parents:
diff changeset
931 trigger += Cyg_Clock::real_time_clock->current_value();
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
932
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jlarmour
parents:
diff changeset
933 sigalrm_alarm.initialize( trigger, 0 );
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parents:
diff changeset
934
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jlarmour
parents:
diff changeset
935 sigalrm_armed = true;
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jlarmour
parents:
diff changeset
936 }
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jlarmour
parents:
diff changeset
937
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
938 signal_mutex.unlock();
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jlarmour
parents:
diff changeset
939
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jlarmour
parents:
diff changeset
940 CYG_REPORT_RETVAL(res);
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jlarmour
parents:
diff changeset
941
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jlarmour
parents:
diff changeset
942 return res;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
943 }
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jlarmour
parents:
diff changeset
944
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
945 // -------------------------------------------------------------------------
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jlarmour
parents:
diff changeset
946 // Wait for a signal to be delivered.
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jlarmour
parents:
diff changeset
947
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jlarmour
parents:
diff changeset
948 externC int pause( void )
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jlarmour
parents:
diff changeset
949 {
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jlarmour
parents:
diff changeset
950 SIGNAL_ENTRY();
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jlarmour
parents:
diff changeset
951
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jlarmour
parents:
diff changeset
952 signal_mutex.lock();
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jlarmour
parents:
diff changeset
953
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jlarmour
parents:
diff changeset
954 // Check for any pending signals that can be delivered and
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jlarmour
parents:
diff changeset
955 // if there are none, wait for a signal to be generated
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jlarmour
parents:
diff changeset
956 if( !cyg_deliver_signals() )
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jlarmour
parents:
diff changeset
957 signal_sigwait.wait();
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jlarmour
parents:
diff changeset
958
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jlarmour
parents:
diff changeset
959 // Now check again for some signals to deliver
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jlarmour
parents:
diff changeset
960 cyg_deliver_signals();
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jlarmour
parents:
diff changeset
961
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jlarmour
parents:
diff changeset
962 signal_mutex.unlock();
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jlarmour
parents:
diff changeset
963
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jlarmour
parents:
diff changeset
964 SIGNAL_RETURN(EINTR);
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jlarmour
parents:
diff changeset
965 }
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jlarmour
parents:
diff changeset
966
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jlarmour
parents:
diff changeset
967 // -------------------------------------------------------------------------
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jlarmour
parents:
diff changeset
968 // Wait for a signal, or the given number of seconds
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jlarmour
parents:
diff changeset
969
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jlarmour
parents:
diff changeset
970 externC unsigned int sleep( unsigned int seconds )
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jlarmour
parents:
diff changeset
971 {
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jlarmour
parents:
diff changeset
972 SIGNAL_ENTRY();
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jlarmour
parents:
diff changeset
973
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
974 struct timespec timeout;
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jlarmour
parents:
diff changeset
975
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
976 timeout.tv_sec = seconds;
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jlarmour
parents:
diff changeset
977 timeout.tv_nsec = 0;
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jlarmour
parents:
diff changeset
978
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
979 if( nanosleep( &timeout, &timeout ) != 0 )
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
980 {
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jlarmour
parents:
diff changeset
981 CYG_REPORT_RETVAL(timeout.tv_sec);
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jlarmour
parents:
diff changeset
982 return timeout.tv_sec;
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jlarmour
parents:
diff changeset
983 }
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jlarmour
parents:
diff changeset
984
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
985 CYG_REPORT_RETVAL(0);
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jlarmour
parents:
diff changeset
986 return 0;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
987 }
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jlarmour
parents:
diff changeset
988
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
989 //==========================================================================
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jlarmour
parents:
diff changeset
990 // Signal sets
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jlarmour
parents:
diff changeset
991
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
992 // -------------------------------------------------------------------------
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jlarmour
parents:
diff changeset
993 // Clear all signals from set.
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jlarmour
parents:
diff changeset
994
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
995 externC int sigemptyset (sigset_t *set)
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
996 {
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
997 SIGNAL_ENTRY();
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jlarmour
parents:
diff changeset
998
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
999 *set = 0;
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jlarmour
parents:
diff changeset
1000
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
1001 SIGNAL_RETURN(0);
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
1002 }
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
1003
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
1004
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
1005 // -------------------------------------------------------------------------
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jlarmour
parents:
diff changeset
1006 // Set all signals in set.
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jlarmour
parents:
diff changeset
1007
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
1008 externC int sigfillset (sigset_t *set)
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
1009 {
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
1010 SIGNAL_ENTRY();
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
1011
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
1012 *set = ~0;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
1013
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
1014 SIGNAL_RETURN(0);
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
1015 }
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
1016
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
1017
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
1018 // -------------------------------------------------------------------------
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jlarmour
parents:
diff changeset
1019 // Add signo to set.
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jlarmour
parents:
diff changeset
1020
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
1021 externC int sigaddset (sigset_t *set, int signo)
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
1022 {
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
1023 SIGNAL_ENTRY();
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
1024
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
1025 int err = 0;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
1026
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
1027 if( !SIGNAL_VALID(signo) )
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jlarmour
parents:
diff changeset
1028 err = EINVAL;
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jlarmour
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diff changeset
1029 else *set |= 1<<signo;
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1030
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1031 SIGNAL_RETURN(err);
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1032 }
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1033
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1034
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1035 // -------------------------------------------------------------------------
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1036 // Remove signo from set.
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1037
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1038 externC int sigdelset (sigset_t *set, int signo)
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1039 {
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1040 SIGNAL_ENTRY();
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1041
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1042 int err = 0;
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1043
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1044 if( !SIGNAL_VALID(signo) )
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1045 err = EINVAL;
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1046 else *set &= ~(1<<signo);
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1047
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1048 SIGNAL_RETURN(err);
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1049 }
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1050
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1051
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1052 // -------------------------------------------------------------------------
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1053 // Test whether signo is in set
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1054
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1055 externC int sigismember (const sigset_t *set, int signo)
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1056 {
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1057 SIGNAL_ENTRY();
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1058
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1059 int ret = 0;
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1060
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1061 if( !SIGNAL_VALID(signo) )
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1062 SIGNAL_RETURN(EINVAL);
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1063
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1064 if( *set & (1<<signo) ) ret = 1;
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1065
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1066 CYG_REPORT_RETVAL( ret );
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1067 return ret;
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1068 }
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1069
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1070 //==========================================================================
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1071 // ISO C compatibility functions
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1072
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1073 // -------------------------------------------------------------------------
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1074 // Installs a new signal handler for the specified signal, and returns
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1075 // the old handler
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1076
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1077 externC sa_sighandler_t signal(int sig, sa_sighandler_t handler)
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1078 {
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1079 SIGNAL_ENTRY();
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1080
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1081 int err;
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1082 sa_sighandler_t ret;
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1083 struct sigaction new_action;
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1084 struct sigaction old_action;
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1085
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1086 sigemptyset( &new_action.sa_mask );
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1087 new_action.sa_flags = 0;
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1088 new_action.sa_handler = handler;
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1089
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1090 err = sigaction( sig, &new_action, &old_action );
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1091
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1092 if( err < 0 )
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1093 ret = SIG_ERR;
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1094 else ret = old_action.sa_handler;
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1095
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1096 CYG_REPORT_RETVAL( ret );
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1097 return ret;
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1098 }
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1099
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1100 // -------------------------------------------------------------------------
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1101 // raise() - ISO C 7.7.2 //
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1102 //
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1103 // Raises the signal, which will cause the current signal handler for
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1104 // that signal to be called
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1105
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1106 externC int raise(int sig)
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1107 {
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1108 return kill( 0, sig );
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1109 }
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1110
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1111 // -------------------------------------------------------------------------
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1112 // siglongjmp()
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1113 // Restores signal mask and longjumps.
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1114
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1115 __externC void siglongjmp( sigjmp_buf env, int val )
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1116 {
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1117 CYG_REPORT_FUNCNAME( "siglongjmp" );
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1118 CYG_REPORT_FUNCARG2( "&env=%08x, val=%d", &env, val );
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1119
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diff changeset
1120 // ISO C says that if we are passed val == 0, then we change it to 1
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1121 if( val == 0 )
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1122 val = 1;
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diff changeset
1123
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1124 if( *(int *)&env[sizeof(hal_jmp_buf)] )
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1125 pthread_sigmask( SIG_SETMASK, (sigset_t *)&(env)[sizeof(hal_jmp_buf)+sizeof(int)], NULL );
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1126
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1127 HAL_REORDER_BARRIER(); // prevent any chance of optimisation re-ordering
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1128 hal_longjmp( (hal_jmp_buf)env, val );
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1129 HAL_REORDER_BARRIER(); // prevent any chance of optimisation re-ordering
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1130
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1131 #ifdef CYGDBG_USE_ASSERTS
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1132 CYG_ASSERT( 0, "siglongjmp should not have reached this point!" );
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1133 #else
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1134 for (;;)
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1135 CYG_EMPTY_STATEMENT;
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1136 #endif
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1137
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1138 }
115
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1139
151
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1140 #endif // ifdef CYGPKG_POSIX_SIGNALS
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1141
115
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1142 // -------------------------------------------------------------------------
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1143 // EOF signal.cxx