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annotate packages/net/tcpip/current/src/lib/select.c @ 3292:7f8e529b4d82 default tip

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Fix FREESCALE_EDMA_NBYTES_MLOFFYES_MLOFF() so it works with negative offsets.
author vae
date Wed, 29 Apr 2015 23:31:48 +0000
parents 74dbf4c3f2e1
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 //==========================================================================
2729
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8 // ####BSDALTCOPYRIGHTBEGIN####
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9 // -------------------------------------------
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10 // Portions of this software may have been derived from OpenBSD
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11 // or other sources, and if so are covered by the appropriate copyright
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12 // and license included herein.
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13 // -------------------------------------------
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14 // ####BSDALTCOPYRIGHTEND####
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15 //==========================================================================
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16 //#####DESCRIPTIONBEGIN####
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17 //
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18 // Author(s): gthomas
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19 // Contributors: gthomas
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20 // Date: 2000-01-10
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21 // Purpose:
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22 // Description: eCos implementation of 'select()' system call
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23 //
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24 //
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25 //####DESCRIPTIONEND####
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26 //
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27 //==========================================================================
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28
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29 #include <sys/param.h>
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30 #include <cyg/io/file.h>
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31 #include <cyg/kernel/kapi.h>
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32 #include <sys/select.h>
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33 #include <sys/bsdselect.h>
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34
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35 static cyg_flag_t select_flag;
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36 static cyg_bool select_flag_init = false;
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37 #define SELECT_WAKE 0x01
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38 #define SELECT_ABORT 0x02
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39
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40 //
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41 // Private function which does all the work for 'select()'
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42 //
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43 static int
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44 _cyg_select(int nfd, fd_set *in, fd_set *out, fd_set *ex,
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45 struct timeval *tv, cyg_bool_t abortable)
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46 {
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47 int fd, mode, num, ticks;
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48 struct file *fp;
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49 fd_set in_res, out_res, ex_res; // Result sets
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50 fd_set *selection[3], *result[3];
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51 cyg_tick_count_t now, then;
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52 int mode_type[] = {FREAD, FWRITE, 0};
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53 cyg_flag_value_t flag, wait_flag;
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54
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55 // Note: since this is called by application programs, it needs no protection
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56 if (!select_flag_init) {
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57 select_flag_init = true;
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58 cyg_flag_init(&select_flag);
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59 }
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60 wait_flag = SELECT_WAKE;
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61 if (abortable) wait_flag |= SELECT_ABORT;
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62 FD_ZERO(&in_res);
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63 FD_ZERO(&out_res);
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64 FD_ZERO(&ex_res);
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65 // Set up sets
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66 selection[0] = in; result[0] = &in_res;
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67 selection[1] = out; result[1] = &out_res;
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68 selection[2] = ex; result[2] = &ex_res;
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69 // Compute end time
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70 if (tv) {
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71 now = cyg_current_time();
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72 ticks = (tv->tv_sec * 100) + (tv->tv_usec / 10000);
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73 then = now + ticks;
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74 } else {
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75 then = 0; // Compiler warnings :-(
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76 ticks = 0;
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77 }
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78 // Scan sets for possible I/O until something found, timeout or error.
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79 while (true) {
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80 num = 0; // Total file descriptors "ready"
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81
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82 cyg_scheduler_lock(); // Scan the list atomically wrt electing to sleep
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83
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84 for (mode = 0; mode < 3; mode++) {
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85 if (selection[mode]) {
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86 for (fd = 0; fd < nfd; fd++) {
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87 if (FD_ISSET(fd, selection[mode])) {
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88 if (getfp(fd, &fp)) {
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89 cyg_scheduler_unlock(); // return.
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90 errno = EBADF;
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91 return -1;
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92 }
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93 if ((*fp->f_ops->fo_select)(fp, mode_type[mode])) {
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94 FD_SET(fd, result[mode]);
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95 num++;
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96 }
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97 }
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98 }
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99 }
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100 }
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101 if (num) {
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102
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103 cyg_scheduler_unlock(); // Happy, about to return.
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104
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105 // Found something, update user's sets
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106 if (in) {
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107 memcpy(in, &in_res, sizeof(in_res));
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108 }
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109 if (out) {
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110 memcpy(out, &out_res, sizeof(out_res));
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111 }
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112 if (ex) {
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113 memcpy(ex, &ex_res, sizeof(ex_res));
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114 }
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115 return num;
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116 }
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117 // Nothing found, see if we want to wait
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118 if (tv) {
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119 if (ticks == 0) {
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120 // Special case of "poll"
128
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121 cyg_scheduler_unlock(); // About to return.
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122 return 0;
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123 }
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124 flag = cyg_flag_timed_wait(&select_flag, wait_flag,
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125 CYG_FLAG_WAITMODE_OR,
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126 then);
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127 } else {
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128 // Wait forever (until something happens)
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129 flag = cyg_flag_wait(&select_flag, wait_flag,
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130 CYG_FLAG_WAITMODE_OR);
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131 }
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132
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133 cyg_scheduler_unlock(); // waited atomically
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134
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135 if (flag & SELECT_ABORT) {
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136 errno = EINTR;
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137 return -1;
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138 }
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139 if (!flag) {
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140 return 0; // meaning no activity, ergo timeout occurred
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141 }
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142 }
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143 errno = ENOSYS;
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144 return -1;
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145 }
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146
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147 //
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148 // This function is called by the lower layers to record the
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149 // fact that a particular 'select' event is being requested.
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150 //
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151 void
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152 selrecord(void *selector, struct selinfo *info)
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153 {
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154 // Unused by this implementation
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155 }
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156
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157 //
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158 // This function is called to indicate that a 'select' event
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159 // may have occurred.
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160 //
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161 void
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162 selwakeup(struct selinfo *info)
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163 {
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164 // Need these ops to be atomic to make sure the clear occurs -
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165 // otherwise a higher prio thread could hog the CPU when its fds are
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166 // not ready, but the flag is (already) set, or set for someone else.
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167 cyg_scheduler_lock();
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168 cyg_flag_setbits(&select_flag, SELECT_WAKE);
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169 cyg_flag_maskbits(&select_flag, 0 ); // clear all
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170 cyg_scheduler_unlock();
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171 }
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172
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173 //
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174 // The public function used by 'normal' programs. This interface does not allow
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175 // the 'select()' to be externally interrupted.
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176 //
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177 int
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178 select(int nfd, fd_set *in, fd_set *out, fd_set *ex,
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179 struct timeval *tv)
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180 {
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181 return _cyg_select(nfd, in, out, ex, tv, false);
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182 }
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183
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184 //
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185 // The public function used by programs which wish to allow interruption,
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186 // using the 'cyg_select_abort()' function below.
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187 //
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188 int
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189 cyg_select_with_abort(int nfd, fd_set *in, fd_set *out, fd_set *ex,
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190 struct timeval *tv)
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191 {
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192 return _cyg_select(nfd, in, out, ex, tv, true);
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193 }
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194
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195 //
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196 // This function can be called by the user to forceably abort any
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197 // current selects.
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198 //
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199 void
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200 cyg_select_abort(void)
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201 {
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202 // See comments in selwakeup()...
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203 cyg_scheduler_lock();
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204 cyg_flag_setbits(&select_flag, SELECT_ABORT);
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205 cyg_flag_maskbits(&select_flag, 0 );
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206 cyg_scheduler_unlock();
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207 }
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208
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209