1 | /***************************************************************************
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2 | * _ _ ____ _
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3 | * Project ___| | | | _ \| |
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4 | * / __| | | | |_) | |
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5 | * | (__| |_| | _ <| |___
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6 | * \___|\___/|_| \_\_____|
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7 | *
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8 | * Copyright (C) 1998 - 2015, Daniel Stenberg, <daniel@haxx.se>, et al.
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9 | *
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10 | * This software is licensed as described in the file COPYING, which
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11 | * you should have received as part of this distribution. The terms
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12 | * are also available at https://curl.haxx.se/docs/copyright.html.
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13 | *
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14 | * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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15 | * copies of the Software, and permit persons to whom the Software is
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16 | * furnished to do so, under the terms of the COPYING file.
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17 | *
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18 | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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19 | * KIND, either express or implied.
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20 | *
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21 | ***************************************************************************/
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22 |
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23 | #include "curl_setup.h"
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24 |
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25 | #ifdef HAVE_SYS_SELECT_H
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26 | #include <sys/select.h>
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27 | #endif
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28 |
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29 | #if !defined(HAVE_SELECT) && !defined(HAVE_POLL_FINE)
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30 | #error "We can't compile without select() or poll() support."
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31 | #endif
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32 |
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33 | #if defined(__BEOS__) && !defined(__HAIKU__)
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34 | /* BeOS has FD_SET defined in socket.h */
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35 | #include <socket.h>
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36 | #endif
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37 |
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38 | #ifdef MSDOS
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39 | #include <dos.h> /* delay() */
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40 | #endif
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41 |
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42 | #ifdef __VXWORKS__
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43 | #include <strings.h> /* bzero() in FD_SET */
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44 | #endif
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45 |
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46 | #include <curl/curl.h>
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47 |
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48 | #include "urldata.h"
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49 | #include "connect.h"
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50 | #include "select.h"
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51 | #include "warnless.h"
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52 |
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53 | /* Convenience local macros */
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54 |
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55 | #define elapsed_ms (int)curlx_tvdiff(curlx_tvnow(), initial_tv)
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56 |
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57 | int Curl_ack_eintr = 0;
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58 | #define error_not_EINTR (Curl_ack_eintr || error != EINTR)
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59 |
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60 | /*
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61 | * Internal function used for waiting a specific amount of ms
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62 | * in Curl_socket_ready() and Curl_poll() when no file descriptor
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63 | * is provided to wait on, just being used to delay execution.
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64 | * WinSock select() and poll() timeout mechanisms need a valid
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65 | * socket descriptor in a not null file descriptor set to work.
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66 | * Waiting indefinitely with this function is not allowed, a
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67 | * zero or negative timeout value will return immediately.
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68 | * Timeout resolution, accuracy, as well as maximum supported
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69 | * value is system dependent, neither factor is a citical issue
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70 | * for the intended use of this function in the library.
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71 | *
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72 | * Return values:
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73 | * -1 = system call error, invalid timeout value, or interrupted
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74 | * 0 = specified timeout has elapsed
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75 | */
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76 | int Curl_wait_ms(int timeout_ms)
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77 | {
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78 | #if !defined(MSDOS) && !defined(USE_WINSOCK)
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79 | #ifndef HAVE_POLL_FINE
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80 | struct timeval pending_tv;
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81 | #endif
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82 | struct timeval initial_tv;
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83 | int pending_ms;
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84 | int error;
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85 | #endif
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86 | int r = 0;
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87 |
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88 | if(!timeout_ms)
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89 | return 0;
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90 | if(timeout_ms < 0) {
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91 | SET_SOCKERRNO(EINVAL);
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92 | return -1;
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93 | }
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94 | #if defined(MSDOS)
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95 | delay(timeout_ms);
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96 | #elif defined(USE_WINSOCK)
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97 | Sleep(timeout_ms);
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98 | #else
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99 | pending_ms = timeout_ms;
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100 | initial_tv = curlx_tvnow();
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101 | do {
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102 | #if defined(HAVE_POLL_FINE)
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103 | r = poll(NULL, 0, pending_ms);
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104 | #else
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105 | pending_tv.tv_sec = pending_ms / 1000;
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106 | pending_tv.tv_usec = (pending_ms % 1000) * 1000;
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107 | r = select(0, NULL, NULL, NULL, &pending_tv);
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108 | #endif /* HAVE_POLL_FINE */
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109 | if(r != -1)
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110 | break;
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111 | error = SOCKERRNO;
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112 | if(error && error_not_EINTR)
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113 | break;
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114 | pending_ms = timeout_ms - elapsed_ms;
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115 | if(pending_ms <= 0) {
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116 | r = 0; /* Simulate a "call timed out" case */
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117 | break;
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118 | }
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119 | } while(r == -1);
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120 | #endif /* USE_WINSOCK */
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121 | if(r)
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122 | r = -1;
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123 | return r;
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124 | }
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125 |
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126 | /*
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127 | * Wait for read or write events on a set of file descriptors. It uses poll()
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128 | * when a fine poll() is available, in order to avoid limits with FD_SETSIZE,
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129 | * otherwise select() is used. An error is returned if select() is being used
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130 | * and a file descriptor is too large for FD_SETSIZE.
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131 | *
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132 | * A negative timeout value makes this function wait indefinitely,
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133 | * unles no valid file descriptor is given, when this happens the
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134 | * negative timeout is ignored and the function times out immediately.
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135 | *
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136 | * Return values:
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137 | * -1 = system call error or fd >= FD_SETSIZE
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138 | * 0 = timeout
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139 | * [bitmask] = action as described below
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140 | *
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141 | * CURL_CSELECT_IN - first socket is readable
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142 | * CURL_CSELECT_IN2 - second socket is readable
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143 | * CURL_CSELECT_OUT - write socket is writable
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144 | * CURL_CSELECT_ERR - an error condition occurred
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145 | */
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146 | int Curl_socket_check(curl_socket_t readfd0, /* two sockets to read from */
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147 | curl_socket_t readfd1,
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148 | curl_socket_t writefd, /* socket to write to */
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149 | long timeout_ms) /* milliseconds to wait */
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150 | {
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151 | #ifdef HAVE_POLL_FINE
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152 | struct pollfd pfd[3];
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153 | int num;
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154 | #else
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155 | struct timeval pending_tv;
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156 | struct timeval *ptimeout;
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157 | fd_set fds_read;
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158 | fd_set fds_write;
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159 | fd_set fds_err;
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160 | curl_socket_t maxfd;
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161 | #endif
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162 | struct timeval initial_tv = {0, 0};
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163 | int pending_ms = 0;
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164 | int error;
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165 | int r;
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166 | int ret;
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167 |
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168 | if((readfd0 == CURL_SOCKET_BAD) && (readfd1 == CURL_SOCKET_BAD) &&
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169 | (writefd == CURL_SOCKET_BAD)) {
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170 | /* no sockets, just wait */
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171 | r = Curl_wait_ms((int)timeout_ms);
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172 | return r;
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173 | }
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174 |
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175 | /* Avoid initial timestamp, avoid curlx_tvnow() call, when elapsed
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176 | time in this function does not need to be measured. This happens
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177 | when function is called with a zero timeout or a negative timeout
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178 | value indicating a blocking call should be performed. */
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179 |
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180 | if(timeout_ms > 0) {
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181 | pending_ms = (int)timeout_ms;
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182 | initial_tv = curlx_tvnow();
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183 | }
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184 |
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185 | #ifdef HAVE_POLL_FINE
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186 |
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187 | num = 0;
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188 | if(readfd0 != CURL_SOCKET_BAD) {
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189 | pfd[num].fd = readfd0;
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190 | pfd[num].events = POLLRDNORM|POLLIN|POLLRDBAND|POLLPRI;
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191 | pfd[num].revents = 0;
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192 | num++;
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193 | }
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194 | if(readfd1 != CURL_SOCKET_BAD) {
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195 | pfd[num].fd = readfd1;
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196 | pfd[num].events = POLLRDNORM|POLLIN|POLLRDBAND|POLLPRI;
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197 | pfd[num].revents = 0;
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198 | num++;
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199 | }
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200 | if(writefd != CURL_SOCKET_BAD) {
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201 | pfd[num].fd = writefd;
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202 | pfd[num].events = POLLWRNORM|POLLOUT;
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203 | pfd[num].revents = 0;
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204 | num++;
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205 | }
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206 |
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207 | do {
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208 | if(timeout_ms < 0)
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209 | pending_ms = -1;
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210 | else if(!timeout_ms)
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211 | pending_ms = 0;
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212 | r = poll(pfd, num, pending_ms);
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213 | if(r != -1)
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214 | break;
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215 | error = SOCKERRNO;
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216 | if(error && error_not_EINTR)
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217 | break;
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218 | if(timeout_ms > 0) {
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219 | pending_ms = (int)(timeout_ms - elapsed_ms);
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220 | if(pending_ms <= 0) {
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221 | r = 0; /* Simulate a "call timed out" case */
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222 | break;
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223 | }
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224 | }
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225 | } while(r == -1);
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226 |
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227 | if(r < 0)
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228 | return -1;
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229 | if(r == 0)
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230 | return 0;
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231 |
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232 | ret = 0;
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233 | num = 0;
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234 | if(readfd0 != CURL_SOCKET_BAD) {
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235 | if(pfd[num].revents & (POLLRDNORM|POLLIN|POLLERR|POLLHUP))
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236 | ret |= CURL_CSELECT_IN;
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237 | if(pfd[num].revents & (POLLRDBAND|POLLPRI|POLLNVAL))
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238 | ret |= CURL_CSELECT_ERR;
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239 | num++;
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240 | }
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241 | if(readfd1 != CURL_SOCKET_BAD) {
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242 | if(pfd[num].revents & (POLLRDNORM|POLLIN|POLLERR|POLLHUP))
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243 | ret |= CURL_CSELECT_IN2;
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244 | if(pfd[num].revents & (POLLRDBAND|POLLPRI|POLLNVAL))
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245 | ret |= CURL_CSELECT_ERR;
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246 | num++;
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247 | }
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248 | if(writefd != CURL_SOCKET_BAD) {
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249 | if(pfd[num].revents & (POLLWRNORM|POLLOUT))
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250 | ret |= CURL_CSELECT_OUT;
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251 | if(pfd[num].revents & (POLLERR|POLLHUP|POLLNVAL))
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252 | ret |= CURL_CSELECT_ERR;
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253 | }
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254 |
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255 | return ret;
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256 |
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257 | #else /* HAVE_POLL_FINE */
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258 |
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259 | FD_ZERO(&fds_err);
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260 | maxfd = (curl_socket_t)-1;
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261 |
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262 | FD_ZERO(&fds_read);
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263 | if(readfd0 != CURL_SOCKET_BAD) {
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264 | VERIFY_SOCK(readfd0);
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265 | FD_SET(readfd0, &fds_read);
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266 | FD_SET(readfd0, &fds_err);
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267 | maxfd = readfd0;
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268 | }
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269 | if(readfd1 != CURL_SOCKET_BAD) {
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270 | VERIFY_SOCK(readfd1);
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271 | FD_SET(readfd1, &fds_read);
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272 | FD_SET(readfd1, &fds_err);
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273 | if(readfd1 > maxfd)
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274 | maxfd = readfd1;
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275 | }
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276 |
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277 | FD_ZERO(&fds_write);
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278 | if(writefd != CURL_SOCKET_BAD) {
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279 | VERIFY_SOCK(writefd);
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280 | FD_SET(writefd, &fds_write);
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281 | FD_SET(writefd, &fds_err);
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282 | if(writefd > maxfd)
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283 | maxfd = writefd;
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284 | }
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285 |
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286 | ptimeout = (timeout_ms < 0) ? NULL : &pending_tv;
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287 |
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288 | do {
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289 | if(timeout_ms > 0) {
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290 | pending_tv.tv_sec = pending_ms / 1000;
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291 | pending_tv.tv_usec = (pending_ms % 1000) * 1000;
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292 | }
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293 | else if(!timeout_ms) {
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294 | pending_tv.tv_sec = 0;
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295 | pending_tv.tv_usec = 0;
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296 | }
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297 |
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298 | /* WinSock select() must not be called with an fd_set that contains zero
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299 | fd flags, or it will return WSAEINVAL. But, it also can't be called
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300 | with no fd_sets at all! From the documentation:
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301 |
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302 | Any two of the parameters, readfds, writefds, or exceptfds, can be
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303 | given as null. At least one must be non-null, and any non-null
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304 | descriptor set must contain at least one handle to a socket.
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305 |
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306 | We know that we have at least one bit set in at least two fd_sets in
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307 | this case, but we may have no bits set in either fds_read or fd_write,
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308 | so check for that and handle it. Luckily, with WinSock, we can _also_
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309 | ask how many bits are set on an fd_set.
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310 |
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311 | It is unclear why WinSock doesn't just handle this for us instead of
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312 | calling this an error.
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313 |
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314 | Note also that WinSock ignores the first argument, so we don't worry
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315 | about the fact that maxfd is computed incorrectly with WinSock (since
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316 | curl_socket_t is unsigned in such cases and thus -1 is the largest
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317 | value).
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318 | */
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319 | #ifdef USE_WINSOCK
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320 | r = select((int)maxfd + 1,
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321 | fds_read.fd_count ? &fds_read : NULL,
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322 | fds_write.fd_count ? &fds_write : NULL,
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323 | &fds_err, ptimeout);
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324 | #else
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325 | r = select((int)maxfd + 1, &fds_read, &fds_write, &fds_err, ptimeout);
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326 | #endif
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327 |
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328 | if(r != -1)
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329 | break;
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330 | error = SOCKERRNO;
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331 | if(error && error_not_EINTR)
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332 | break;
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333 | if(timeout_ms > 0) {
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334 | pending_ms = timeout_ms - elapsed_ms;
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335 | if(pending_ms <= 0) {
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336 | r = 0; /* Simulate a "call timed out" case */
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337 | break;
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338 | }
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339 | }
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340 | } while(r == -1);
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341 |
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342 | if(r < 0)
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343 | return -1;
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344 | if(r == 0)
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345 | return 0;
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346 |
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347 | ret = 0;
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348 | if(readfd0 != CURL_SOCKET_BAD) {
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349 | if(FD_ISSET(readfd0, &fds_read))
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350 | ret |= CURL_CSELECT_IN;
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351 | if(FD_ISSET(readfd0, &fds_err))
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352 | ret |= CURL_CSELECT_ERR;
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353 | }
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354 | if(readfd1 != CURL_SOCKET_BAD) {
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355 | if(FD_ISSET(readfd1, &fds_read))
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356 | ret |= CURL_CSELECT_IN2;
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357 | if(FD_ISSET(readfd1, &fds_err))
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358 | ret |= CURL_CSELECT_ERR;
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359 | }
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360 | if(writefd != CURL_SOCKET_BAD) {
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361 | if(FD_ISSET(writefd, &fds_write))
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362 | ret |= CURL_CSELECT_OUT;
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363 | if(FD_ISSET(writefd, &fds_err))
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364 | ret |= CURL_CSELECT_ERR;
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365 | }
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366 |
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367 | return ret;
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368 |
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369 | #endif /* HAVE_POLL_FINE */
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370 |
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371 | }
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372 |
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373 | /*
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374 | * This is a wrapper around poll(). If poll() does not exist, then
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375 | * select() is used instead. An error is returned if select() is
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376 | * being used and a file descriptor is too large for FD_SETSIZE.
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377 | * A negative timeout value makes this function wait indefinitely,
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378 | * unles no valid file descriptor is given, when this happens the
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379 | * negative timeout is ignored and the function times out immediately.
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380 | *
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381 | * Return values:
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382 | * -1 = system call error or fd >= FD_SETSIZE
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383 | * 0 = timeout
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384 | * N = number of structures with non zero revent fields
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385 | */
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386 | int Curl_poll(struct pollfd ufds[], unsigned int nfds, int timeout_ms)
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387 | {
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388 | #ifndef HAVE_POLL_FINE
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389 | struct timeval pending_tv;
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390 | struct timeval *ptimeout;
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391 | fd_set fds_read;
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392 | fd_set fds_write;
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393 | fd_set fds_err;
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394 | curl_socket_t maxfd;
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395 | #endif
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396 | struct timeval initial_tv = {0, 0};
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397 | bool fds_none = TRUE;
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398 | unsigned int i;
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399 | int pending_ms = 0;
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400 | int error;
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401 | int r;
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402 |
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403 | if(ufds) {
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404 | for(i = 0; i < nfds; i++) {
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405 | if(ufds[i].fd != CURL_SOCKET_BAD) {
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406 | fds_none = FALSE;
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407 | break;
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408 | }
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409 | }
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410 | }
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411 | if(fds_none) {
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412 | r = Curl_wait_ms(timeout_ms);
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413 | return r;
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414 | }
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415 |
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416 | /* Avoid initial timestamp, avoid curlx_tvnow() call, when elapsed
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417 | time in this function does not need to be measured. This happens
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418 | when function is called with a zero timeout or a negative timeout
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419 | value indicating a blocking call should be performed. */
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420 |
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421 | if(timeout_ms > 0) {
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422 | pending_ms = timeout_ms;
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423 | initial_tv = curlx_tvnow();
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424 | }
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425 |
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426 | #ifdef HAVE_POLL_FINE
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427 |
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428 | do {
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429 | if(timeout_ms < 0)
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430 | pending_ms = -1;
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431 | else if(!timeout_ms)
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432 | pending_ms = 0;
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433 | r = poll(ufds, nfds, pending_ms);
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434 | if(r != -1)
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435 | break;
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436 | error = SOCKERRNO;
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437 | if(error && error_not_EINTR)
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438 | break;
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439 | if(timeout_ms > 0) {
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440 | pending_ms = timeout_ms - elapsed_ms;
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441 | if(pending_ms <= 0) {
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442 | r = 0; /* Simulate a "call timed out" case */
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443 | break;
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444 | }
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445 | }
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446 | } while(r == -1);
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447 |
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448 | if(r < 0)
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449 | return -1;
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450 | if(r == 0)
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451 | return 0;
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452 |
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453 | for(i = 0; i < nfds; i++) {
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---|
454 | if(ufds[i].fd == CURL_SOCKET_BAD)
|
---|
455 | continue;
|
---|
456 | if(ufds[i].revents & POLLHUP)
|
---|
457 | ufds[i].revents |= POLLIN;
|
---|
458 | if(ufds[i].revents & POLLERR)
|
---|
459 | ufds[i].revents |= (POLLIN|POLLOUT);
|
---|
460 | }
|
---|
461 |
|
---|
462 | #else /* HAVE_POLL_FINE */
|
---|
463 |
|
---|
464 | FD_ZERO(&fds_read);
|
---|
465 | FD_ZERO(&fds_write);
|
---|
466 | FD_ZERO(&fds_err);
|
---|
467 | maxfd = (curl_socket_t)-1;
|
---|
468 |
|
---|
469 | for(i = 0; i < nfds; i++) {
|
---|
470 | ufds[i].revents = 0;
|
---|
471 | if(ufds[i].fd == CURL_SOCKET_BAD)
|
---|
472 | continue;
|
---|
473 | VERIFY_SOCK(ufds[i].fd);
|
---|
474 | if(ufds[i].events & (POLLIN|POLLOUT|POLLPRI|
|
---|
475 | POLLRDNORM|POLLWRNORM|POLLRDBAND)) {
|
---|
476 | if(ufds[i].fd > maxfd)
|
---|
477 | maxfd = ufds[i].fd;
|
---|
478 | if(ufds[i].events & (POLLRDNORM|POLLIN))
|
---|
479 | FD_SET(ufds[i].fd, &fds_read);
|
---|
480 | if(ufds[i].events & (POLLWRNORM|POLLOUT))
|
---|
481 | FD_SET(ufds[i].fd, &fds_write);
|
---|
482 | if(ufds[i].events & (POLLRDBAND|POLLPRI))
|
---|
483 | FD_SET(ufds[i].fd, &fds_err);
|
---|
484 | }
|
---|
485 | }
|
---|
486 |
|
---|
487 | #ifdef USE_WINSOCK
|
---|
488 | /* WinSock select() can't handle zero events. See the comment about this in
|
---|
489 | Curl_check_socket(). */
|
---|
490 | if(fds_read.fd_count == 0 && fds_write.fd_count == 0
|
---|
491 | && fds_err.fd_count == 0) {
|
---|
492 | r = Curl_wait_ms(timeout_ms);
|
---|
493 | return r;
|
---|
494 | }
|
---|
495 | #endif
|
---|
496 |
|
---|
497 | ptimeout = (timeout_ms < 0) ? NULL : &pending_tv;
|
---|
498 |
|
---|
499 | do {
|
---|
500 | if(timeout_ms > 0) {
|
---|
501 | pending_tv.tv_sec = pending_ms / 1000;
|
---|
502 | pending_tv.tv_usec = (pending_ms % 1000) * 1000;
|
---|
503 | }
|
---|
504 | else if(!timeout_ms) {
|
---|
505 | pending_tv.tv_sec = 0;
|
---|
506 | pending_tv.tv_usec = 0;
|
---|
507 | }
|
---|
508 |
|
---|
509 | #ifdef USE_WINSOCK
|
---|
510 | r = select((int)maxfd + 1,
|
---|
511 | /* WinSock select() can't handle fd_sets with zero bits set, so
|
---|
512 | don't give it such arguments. See the comment about this in
|
---|
513 | Curl_check_socket().
|
---|
514 | */
|
---|
515 | fds_read.fd_count ? &fds_read : NULL,
|
---|
516 | fds_write.fd_count ? &fds_write : NULL,
|
---|
517 | fds_err.fd_count ? &fds_err : NULL, ptimeout);
|
---|
518 | #else
|
---|
519 | r = select((int)maxfd + 1, &fds_read, &fds_write, &fds_err, ptimeout);
|
---|
520 | #endif
|
---|
521 | if(r != -1)
|
---|
522 | break;
|
---|
523 | error = SOCKERRNO;
|
---|
524 | if(error && error_not_EINTR)
|
---|
525 | break;
|
---|
526 | if(timeout_ms > 0) {
|
---|
527 | pending_ms = timeout_ms - elapsed_ms;
|
---|
528 | if(pending_ms <= 0) {
|
---|
529 | r = 0; /* Simulate a "call timed out" case */
|
---|
530 | break;
|
---|
531 | }
|
---|
532 | }
|
---|
533 | } while(r == -1);
|
---|
534 |
|
---|
535 | if(r < 0)
|
---|
536 | return -1;
|
---|
537 | if(r == 0)
|
---|
538 | return 0;
|
---|
539 |
|
---|
540 | r = 0;
|
---|
541 | for(i = 0; i < nfds; i++) {
|
---|
542 | ufds[i].revents = 0;
|
---|
543 | if(ufds[i].fd == CURL_SOCKET_BAD)
|
---|
544 | continue;
|
---|
545 | if(FD_ISSET(ufds[i].fd, &fds_read))
|
---|
546 | ufds[i].revents |= POLLIN;
|
---|
547 | if(FD_ISSET(ufds[i].fd, &fds_write))
|
---|
548 | ufds[i].revents |= POLLOUT;
|
---|
549 | if(FD_ISSET(ufds[i].fd, &fds_err))
|
---|
550 | ufds[i].revents |= POLLPRI;
|
---|
551 | if(ufds[i].revents != 0)
|
---|
552 | r++;
|
---|
553 | }
|
---|
554 |
|
---|
555 | #endif /* HAVE_POLL_FINE */
|
---|
556 |
|
---|
557 | return r;
|
---|
558 | }
|
---|
559 |
|
---|
560 | #ifdef TPF
|
---|
561 | /*
|
---|
562 | * This is a replacement for select() on the TPF platform.
|
---|
563 | * It is used whenever libcurl calls select().
|
---|
564 | * The call below to tpf_process_signals() is required because
|
---|
565 | * TPF's select calls are not signal interruptible.
|
---|
566 | *
|
---|
567 | * Return values are the same as select's.
|
---|
568 | */
|
---|
569 | int tpf_select_libcurl(int maxfds, fd_set* reads, fd_set* writes,
|
---|
570 | fd_set* excepts, struct timeval* tv)
|
---|
571 | {
|
---|
572 | int rc;
|
---|
573 |
|
---|
574 | rc = tpf_select_bsd(maxfds, reads, writes, excepts, tv);
|
---|
575 | tpf_process_signals();
|
---|
576 | return rc;
|
---|
577 | }
|
---|
578 | #endif /* TPF */
|
---|