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annotate packages/net/tcpip/current/src/lib/select.c @ 112:02ea4320376c ecos-sw-2000-07-21

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Merge from eCos master repository on 2000-07-21-21:01:39-BST
author jlarmour
date Fri, 21 Jul 2000 21:34:11 +0000
parents ced4577552cd
children 0c2b7be0d798
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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
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60 static cyg_flag_t select_flag;
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61 static cyg_bool select_flag_init = false;
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62 #define SELECT_WAKE 0x01
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63 #define SELECT_ABORT 0x02
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64
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65 //
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66 // Private function which does all the work for 'select()'
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67 //
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68 static int
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69 _cyg_select(int nfd, fd_set *in, fd_set *out, fd_set *ex,
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70 struct timeval *tv, cyg_bool_t abortable)
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71 {
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72 int fd, mode, num, ticks;
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73 struct file *fp;
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74 fd_set in_res, out_res, ex_res; // Result sets
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75 fd_set *selection[3], *result[3];
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76 cyg_tick_count_t now, then;
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77 int mode_type[] = {FREAD, FWRITE, 0};
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78 cyg_flag_value_t flag, wait_flag;
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79
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80 // Note: since this is called by application programs, it needs no protection
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81 if (!select_flag_init) {
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82 select_flag_init = true;
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83 cyg_flag_init(&select_flag);
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84 }
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85 wait_flag = SELECT_WAKE;
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86 if (abortable) wait_flag |= SELECT_ABORT;
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87 FD_ZERO(&in_res);
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88 FD_ZERO(&out_res);
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89 FD_ZERO(&ex_res);
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90 // Set up sets
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91 selection[0] = in; result[0] = &in_res;
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92 selection[1] = out; result[1] = &out_res;
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93 selection[2] = ex; result[2] = &ex_res;
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94 // Compute end time
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95 if (tv) {
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96 now = cyg_current_time();
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97 ticks = (tv->tv_sec * 100) + (tv->tv_usec / 10000);
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98 then = now + ticks;
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99 } else {
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100 then = 0; // Compiler warnings :-(
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101 ticks = 0;
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102 }
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103 // Scan sets for possible I/O until something found, timeout or error.
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104 while (true) {
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105 num = 0; // Total file descriptors "ready"
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106 for (mode = 0; mode < 3; mode++) {
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107 if (selection[mode]) {
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108 for (fd = 0; fd < nfd; fd++) {
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109 if (FD_ISSET(fd, selection[mode])) {
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110 if (getfp(fd, &fp)) {
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111 errno = EBADF;
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112 return -1;
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113 }
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114 if ((*fp->f_ops->fo_select)(fp, mode_type[mode])) {
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115 FD_SET(fd, result[mode]);
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116 num++;
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117 }
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118 }
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119 }
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120 }
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121 }
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122 if (num) {
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123 // Found something, update user's sets
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124 if (in) {
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125 memcpy(in, &in_res, sizeof(in_res));
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126 }
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127 if (out) {
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128 memcpy(out, &out_res, sizeof(out_res));
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129 }
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130 if (ex) {
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131 memcpy(ex, &ex_res, sizeof(ex_res));
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132 }
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133 return num;
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134 }
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135 // Nothing found, see if we want to wait
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136 if (tv) {
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137 if (ticks == 0) {
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138 // Special case of "poll"
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139 return 0;
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140 }
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141 flag = cyg_flag_timed_wait(&select_flag, wait_flag,
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142 CYG_FLAG_WAITMODE_OR,
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143 then);
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144 } else {
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145 // Wait forever (until something happens)
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146 flag = cyg_flag_wait(&select_flag, wait_flag,
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147 CYG_FLAG_WAITMODE_OR);
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148 }
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149 if (flag & SELECT_ABORT) {
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150 errno = EINTR;
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151 return -1;
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152 }
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153 if (!flag) {
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154 return 0; // meaning no activity, ergo timeout occurred
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155 }
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156 }
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157 errno = ENOSYS;
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158 return -1;
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159 }
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160
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161 //
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162 // This function is called by the lower layers to record the
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163 // fact that a particular 'select' event is being requested.
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164 //
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165 void
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166 selrecord(void *selector, struct selinfo *info)
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167 {
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168 // Unused by this implementation
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169 }
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170
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171 //
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172 // This function is called to indicate that a 'select' event
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173 // may have occurred.
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174 //
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175 void
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176 selwakeup(struct selinfo *info)
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177 {
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178 cyg_scheduler_lock(); // Need this test to be indivisible
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179 if (cyg_flag_waiting(&select_flag)) {
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180 // Signal any threads doing a 'select()' that I/O may be possible
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181 cyg_flag_setbits(&select_flag, SELECT_WAKE);
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182 cyg_flag_maskbits(&select_flag, 0 ); // clear all
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183 }
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184 cyg_scheduler_unlock();
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185 }
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186
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187 //
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188 // The public function used by 'normal' programs. This interface does not allow
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189 // the 'select()' to be externally interrupted.
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190 //
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191 int
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192 select(int nfd, fd_set *in, fd_set *out, fd_set *ex,
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193 struct timeval *tv)
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194 {
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195 return _cyg_select(nfd, in, out, ex, tv, false);
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196 }
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197
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198 //
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199 // The public function used by programs which wish to allow interruption,
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200 // using the 'cyg_select_abort()' function below.
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201 //
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202 int
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203 cyg_select_with_abort(int nfd, fd_set *in, fd_set *out, fd_set *ex,
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204 struct timeval *tv)
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205 {
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206 return _cyg_select(nfd, in, out, ex, tv, true);
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207 }
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208
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209 //
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210 // This function can be called by the user to forceably abort any
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211 // current selects.
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212 //
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213 void
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214 cyg_select_abort(void)
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215 {
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216 cyg_scheduler_lock(); // Need this test to be indivisible
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217 if (cyg_flag_waiting(&select_flag)) {
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218 // Signal any threads doing a 'select()' that I/O may be possible
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219 cyg_flag_setbits(&select_flag, SELECT_ABORT);
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220 cyg_flag_maskbits(&select_flag, 0 ); // clear all
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221 }
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222 cyg_scheduler_unlock();
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223 }
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224
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225