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annotate packages/net/tcpip/current/src/lib/select.c @ 174:38892b97b685

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Merge from eCos master repository on 2001-07-28-00:17:32-BST
author jlarmour
date Sun, 29 Jul 2001 02:00:07 +0000
parents 0c2b7be0d798
children e0c0827131d1
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1 //==========================================================================
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2 //
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3 // lib/select.c
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4 //
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5 // 'select()' system call
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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 //####BSDCOPYRIGHTBEGIN####
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32 //
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33 // -------------------------------------------
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34 //
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35 // Portions of this software may have been derived from OpenBSD or other sources,
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36 // and are covered by the appropriate copyright disclaimers included herein.
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37 //
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38 // -------------------------------------------
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39 //
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40 //####BSDCOPYRIGHTEND####
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41 //==========================================================================
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42 //#####DESCRIPTIONBEGIN####
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43 //
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44 // Author(s): gthomas
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45 // Contributors: gthomas
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46 // Date: 2000-01-10
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47 // Purpose:
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48 // Description: eCos implementation of 'select()' system call
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49 //
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50 //
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51 //####DESCRIPTIONEND####
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52 //
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53 //==========================================================================
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54
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55 #include <sys/param.h>
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56 #include <cyg/io/file.h>
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57 #include <cyg/kernel/kapi.h>
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58 #include <sys/select.h>
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59 #include <sys/bsdselect.h>
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60
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61 static cyg_flag_t select_flag;
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62 static cyg_bool select_flag_init = false;
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63 #define SELECT_WAKE 0x01
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64 #define SELECT_ABORT 0x02
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65
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66 //
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67 // Private function which does all the work for 'select()'
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68 //
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69 static int
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70 _cyg_select(int nfd, fd_set *in, fd_set *out, fd_set *ex,
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71 struct timeval *tv, cyg_bool_t abortable)
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72 {
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73 int fd, mode, num, ticks;
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74 struct file *fp;
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75 fd_set in_res, out_res, ex_res; // Result sets
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76 fd_set *selection[3], *result[3];
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77 cyg_tick_count_t now, then;
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78 int mode_type[] = {FREAD, FWRITE, 0};
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79 cyg_flag_value_t flag, wait_flag;
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80
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81 // Note: since this is called by application programs, it needs no protection
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82 if (!select_flag_init) {
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83 select_flag_init = true;
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84 cyg_flag_init(&select_flag);
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85 }
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86 wait_flag = SELECT_WAKE;
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87 if (abortable) wait_flag |= SELECT_ABORT;
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88 FD_ZERO(&in_res);
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89 FD_ZERO(&out_res);
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90 FD_ZERO(&ex_res);
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91 // Set up sets
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92 selection[0] = in; result[0] = &in_res;
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93 selection[1] = out; result[1] = &out_res;
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94 selection[2] = ex; result[2] = &ex_res;
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95 // Compute end time
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96 if (tv) {
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97 now = cyg_current_time();
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98 ticks = (tv->tv_sec * 100) + (tv->tv_usec / 10000);
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99 then = now + ticks;
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100 } else {
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101 then = 0; // Compiler warnings :-(
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102 ticks = 0;
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103 }
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104 // Scan sets for possible I/O until something found, timeout or error.
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105 while (true) {
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106 num = 0; // Total file descriptors "ready"
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107
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108 cyg_scheduler_lock(); // Scan the list atomically wrt electing to sleep
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109
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110 for (mode = 0; mode < 3; mode++) {
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111 if (selection[mode]) {
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112 for (fd = 0; fd < nfd; fd++) {
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113 if (FD_ISSET(fd, selection[mode])) {
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114 if (getfp(fd, &fp)) {
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115 cyg_scheduler_unlock(); // return.
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116 errno = EBADF;
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117 return -1;
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118 }
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119 if ((*fp->f_ops->fo_select)(fp, mode_type[mode])) {
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120 FD_SET(fd, result[mode]);
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121 num++;
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122 }
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123 }
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124 }
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125 }
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126 }
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127 if (num) {
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128
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129 cyg_scheduler_unlock(); // Happy, about to return.
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130
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131 // Found something, update user's sets
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132 if (in) {
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133 memcpy(in, &in_res, sizeof(in_res));
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134 }
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135 if (out) {
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136 memcpy(out, &out_res, sizeof(out_res));
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137 }
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138 if (ex) {
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139 memcpy(ex, &ex_res, sizeof(ex_res));
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140 }
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141 return num;
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142 }
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143 // Nothing found, see if we want to wait
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144 if (tv) {
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145 if (ticks == 0) {
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146 // Special case of "poll"
128
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147 cyg_scheduler_unlock(); // About to return.
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148 return 0;
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149 }
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150 flag = cyg_flag_timed_wait(&select_flag, wait_flag,
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151 CYG_FLAG_WAITMODE_OR,
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152 then);
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153 } else {
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154 // Wait forever (until something happens)
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155 flag = cyg_flag_wait(&select_flag, wait_flag,
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156 CYG_FLAG_WAITMODE_OR);
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157 }
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158
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159 cyg_scheduler_unlock(); // waited atomically
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160
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161 if (flag & SELECT_ABORT) {
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162 errno = EINTR;
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163 return -1;
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164 }
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165 if (!flag) {
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166 return 0; // meaning no activity, ergo timeout occurred
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167 }
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168 }
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169 errno = ENOSYS;
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170 return -1;
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171 }
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172
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173 //
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174 // This function is called by the lower layers to record the
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175 // fact that a particular 'select' event is being requested.
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176 //
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177 void
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178 selrecord(void *selector, struct selinfo *info)
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179 {
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180 // Unused by this implementation
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181 }
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182
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183 //
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184 // This function is called to indicate that a 'select' event
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185 // may have occurred.
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186 //
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187 void
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188 selwakeup(struct selinfo *info)
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189 {
128
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190 // Need these ops to be atomic to make sure the clear occurs -
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191 // otherwise a higher prio thread could hog the CPU when its fds are
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192 // not ready, but the flag is (already) set, or set for someone else.
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193 cyg_scheduler_lock();
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194 cyg_flag_setbits(&select_flag, SELECT_WAKE);
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195 cyg_flag_maskbits(&select_flag, 0 ); // clear all
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196 cyg_scheduler_unlock();
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197 }
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198
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199 //
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200 // The public function used by 'normal' programs. This interface does not allow
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201 // the 'select()' to be externally interrupted.
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202 //
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203 int
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204 select(int nfd, fd_set *in, fd_set *out, fd_set *ex,
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205 struct timeval *tv)
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206 {
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207 return _cyg_select(nfd, in, out, ex, tv, false);
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208 }
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209
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210 //
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211 // The public function used by programs which wish to allow interruption,
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212 // using the 'cyg_select_abort()' function below.
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213 //
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214 int
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215 cyg_select_with_abort(int nfd, fd_set *in, fd_set *out, fd_set *ex,
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216 struct timeval *tv)
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217 {
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218 return _cyg_select(nfd, in, out, ex, tv, true);
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219 }
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220
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221 //
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222 // This function can be called by the user to forceably abort any
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223 // current selects.
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224 //
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225 void
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226 cyg_select_abort(void)
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227 {
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228 // See comments in selwakeup()...
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229 cyg_scheduler_lock();
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230 cyg_flag_setbits(&select_flag, SELECT_ABORT);
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231 cyg_flag_maskbits(&select_flag, 0 );
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232 cyg_scheduler_unlock();
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233 }
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234
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235