Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 1 | /*************************************************************************** |
| 2 | * _ _ ____ _ |
| 3 | * Project ___| | | | _ \| | |
| 4 | * / __| | | | |_) | | |
| 5 | * | (__| |_| | _ <| |___ |
| 6 | * \___|\___/|_| \_\_____| |
| 7 | * |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 8 | * Copyright (C) 1998 - 2015, Daniel Stenberg, <daniel@haxx.se>, et al. |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 9 | * |
| 10 | * This software is licensed as described in the file COPYING, which |
| 11 | * you should have received as part of this distribution. The terms |
| 12 | * are also available at http://curl.haxx.se/docs/copyright.html. |
| 13 | * |
| 14 | * You may opt to use, copy, modify, merge, publish, distribute and/or sell |
| 15 | * copies of the Software, and permit persons to whom the Software is |
| 16 | * furnished to do so, under the terms of the COPYING file. |
| 17 | * |
| 18 | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY |
| 19 | * KIND, either express or implied. |
| 20 | * |
| 21 | ***************************************************************************/ |
| 22 | |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 23 | #include "curl_setup.h" |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 24 | |
| 25 | #ifdef HAVE_SYS_SELECT_H |
| 26 | #include <sys/select.h> |
| 27 | #endif |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 28 | |
| 29 | #if !defined(HAVE_SELECT) && !defined(HAVE_POLL_FINE) |
| 30 | #error "We can't compile without select() or poll() support." |
| 31 | #endif |
| 32 | |
| 33 | #if defined(__BEOS__) && !defined(__HAIKU__) |
| 34 | /* BeOS has FD_SET defined in socket.h */ |
| 35 | #include <socket.h> |
| 36 | #endif |
| 37 | |
| 38 | #ifdef MSDOS |
| 39 | #include <dos.h> /* delay() */ |
| 40 | #endif |
| 41 | |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 42 | #ifdef __VXWORKS__ |
| 43 | #include <strings.h> /* bzero() in FD_SET */ |
| 44 | #endif |
| 45 | |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 46 | #include <curl/curl.h> |
| 47 | |
| 48 | #include "urldata.h" |
| 49 | #include "connect.h" |
| 50 | #include "select.h" |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 51 | #include "warnless.h" |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 52 | |
| 53 | /* Convenience local macros */ |
| 54 | |
| 55 | #define elapsed_ms (int)curlx_tvdiff(curlx_tvnow(), initial_tv) |
| 56 | |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 57 | int Curl_ack_eintr = 0; |
| 58 | #define error_not_EINTR (Curl_ack_eintr || error != EINTR) |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 59 | |
| 60 | /* |
| 61 | * Internal function used for waiting a specific amount of ms |
| 62 | * in Curl_socket_ready() and Curl_poll() when no file descriptor |
| 63 | * is provided to wait on, just being used to delay execution. |
| 64 | * WinSock select() and poll() timeout mechanisms need a valid |
| 65 | * socket descriptor in a not null file descriptor set to work. |
| 66 | * Waiting indefinitely with this function is not allowed, a |
| 67 | * zero or negative timeout value will return immediately. |
| 68 | * Timeout resolution, accuracy, as well as maximum supported |
| 69 | * value is system dependent, neither factor is a citical issue |
| 70 | * for the intended use of this function in the library. |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 71 | * |
| 72 | * Return values: |
| 73 | * -1 = system call error, invalid timeout value, or interrupted |
| 74 | * 0 = specified timeout has elapsed |
| 75 | */ |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 76 | int Curl_wait_ms(int timeout_ms) |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 77 | { |
| 78 | #if !defined(MSDOS) && !defined(USE_WINSOCK) |
| 79 | #ifndef HAVE_POLL_FINE |
| 80 | struct timeval pending_tv; |
| 81 | #endif |
| 82 | struct timeval initial_tv; |
| 83 | int pending_ms; |
| 84 | int error; |
| 85 | #endif |
| 86 | int r = 0; |
| 87 | |
| 88 | if(!timeout_ms) |
| 89 | return 0; |
| 90 | if(timeout_ms < 0) { |
| 91 | SET_SOCKERRNO(EINVAL); |
| 92 | return -1; |
| 93 | } |
| 94 | #if defined(MSDOS) |
| 95 | delay(timeout_ms); |
| 96 | #elif defined(USE_WINSOCK) |
| 97 | Sleep(timeout_ms); |
| 98 | #else |
| 99 | pending_ms = timeout_ms; |
| 100 | initial_tv = curlx_tvnow(); |
| 101 | do { |
| 102 | #if defined(HAVE_POLL_FINE) |
| 103 | r = poll(NULL, 0, pending_ms); |
| 104 | #else |
| 105 | pending_tv.tv_sec = pending_ms / 1000; |
| 106 | pending_tv.tv_usec = (pending_ms % 1000) * 1000; |
| 107 | r = select(0, NULL, NULL, NULL, &pending_tv); |
| 108 | #endif /* HAVE_POLL_FINE */ |
| 109 | if(r != -1) |
| 110 | break; |
| 111 | error = SOCKERRNO; |
| 112 | if(error && error_not_EINTR) |
| 113 | break; |
| 114 | pending_ms = timeout_ms - elapsed_ms; |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 115 | if(pending_ms <= 0) { |
| 116 | r = 0; /* Simulate a "call timed out" case */ |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 117 | break; |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 118 | } |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 119 | } while(r == -1); |
| 120 | #endif /* USE_WINSOCK */ |
| 121 | if(r) |
| 122 | r = -1; |
| 123 | return r; |
| 124 | } |
| 125 | |
| 126 | /* |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 127 | * Wait for read or write events on a set of file descriptors. It uses poll() |
| 128 | * when a fine poll() is available, in order to avoid limits with FD_SETSIZE, |
| 129 | * otherwise select() is used. An error is returned if select() is being used |
| 130 | * and a file descriptor is too large for FD_SETSIZE. |
| 131 | * |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 132 | * A negative timeout value makes this function wait indefinitely, |
| 133 | * unles no valid file descriptor is given, when this happens the |
| 134 | * negative timeout is ignored and the function times out immediately. |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 135 | * |
| 136 | * Return values: |
| 137 | * -1 = system call error or fd >= FD_SETSIZE |
| 138 | * 0 = timeout |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 139 | * [bitmask] = action as described below |
| 140 | * |
| 141 | * CURL_CSELECT_IN - first socket is readable |
| 142 | * CURL_CSELECT_IN2 - second socket is readable |
| 143 | * CURL_CSELECT_OUT - write socket is writable |
| 144 | * CURL_CSELECT_ERR - an error condition occurred |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 145 | */ |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 146 | int Curl_socket_check(curl_socket_t readfd0, /* two sockets to read from */ |
| 147 | curl_socket_t readfd1, |
| 148 | curl_socket_t writefd, /* socket to write to */ |
| 149 | long timeout_ms) /* milliseconds to wait */ |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 150 | { |
| 151 | #ifdef HAVE_POLL_FINE |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 152 | struct pollfd pfd[3]; |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 153 | int num; |
| 154 | #else |
| 155 | struct timeval pending_tv; |
| 156 | struct timeval *ptimeout; |
| 157 | fd_set fds_read; |
| 158 | fd_set fds_write; |
| 159 | fd_set fds_err; |
| 160 | curl_socket_t maxfd; |
| 161 | #endif |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 162 | struct timeval initial_tv = {0, 0}; |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 163 | int pending_ms = 0; |
| 164 | int error; |
| 165 | int r; |
| 166 | int ret; |
| 167 | |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 168 | if((readfd0 == CURL_SOCKET_BAD) && (readfd1 == CURL_SOCKET_BAD) && |
| 169 | (writefd == CURL_SOCKET_BAD)) { |
| 170 | /* no sockets, just wait */ |
| 171 | r = Curl_wait_ms((int)timeout_ms); |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 172 | return r; |
| 173 | } |
| 174 | |
| 175 | /* Avoid initial timestamp, avoid curlx_tvnow() call, when elapsed |
| 176 | time in this function does not need to be measured. This happens |
| 177 | when function is called with a zero timeout or a negative timeout |
| 178 | value indicating a blocking call should be performed. */ |
| 179 | |
| 180 | if(timeout_ms > 0) { |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 181 | pending_ms = (int)timeout_ms; |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 182 | initial_tv = curlx_tvnow(); |
| 183 | } |
| 184 | |
| 185 | #ifdef HAVE_POLL_FINE |
| 186 | |
| 187 | num = 0; |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 188 | if(readfd0 != CURL_SOCKET_BAD) { |
| 189 | pfd[num].fd = readfd0; |
| 190 | pfd[num].events = POLLRDNORM|POLLIN|POLLRDBAND|POLLPRI; |
| 191 | pfd[num].revents = 0; |
| 192 | num++; |
| 193 | } |
| 194 | if(readfd1 != CURL_SOCKET_BAD) { |
| 195 | pfd[num].fd = readfd1; |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 196 | pfd[num].events = POLLRDNORM|POLLIN|POLLRDBAND|POLLPRI; |
| 197 | pfd[num].revents = 0; |
| 198 | num++; |
| 199 | } |
| 200 | if(writefd != CURL_SOCKET_BAD) { |
| 201 | pfd[num].fd = writefd; |
| 202 | pfd[num].events = POLLWRNORM|POLLOUT; |
| 203 | pfd[num].revents = 0; |
| 204 | num++; |
| 205 | } |
| 206 | |
| 207 | do { |
| 208 | if(timeout_ms < 0) |
| 209 | pending_ms = -1; |
| 210 | else if(!timeout_ms) |
| 211 | pending_ms = 0; |
| 212 | r = poll(pfd, num, pending_ms); |
| 213 | if(r != -1) |
| 214 | break; |
| 215 | error = SOCKERRNO; |
| 216 | if(error && error_not_EINTR) |
| 217 | break; |
| 218 | if(timeout_ms > 0) { |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 219 | pending_ms = (int)(timeout_ms - elapsed_ms); |
| 220 | if(pending_ms <= 0) { |
| 221 | r = 0; /* Simulate a "call timed out" case */ |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 222 | break; |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 223 | } |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 224 | } |
| 225 | } while(r == -1); |
| 226 | |
| 227 | if(r < 0) |
| 228 | return -1; |
| 229 | if(r == 0) |
| 230 | return 0; |
| 231 | |
| 232 | ret = 0; |
| 233 | num = 0; |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 234 | if(readfd0 != CURL_SOCKET_BAD) { |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 235 | if(pfd[num].revents & (POLLRDNORM|POLLIN|POLLERR|POLLHUP)) |
| 236 | ret |= CURL_CSELECT_IN; |
| 237 | if(pfd[num].revents & (POLLRDBAND|POLLPRI|POLLNVAL)) |
| 238 | ret |= CURL_CSELECT_ERR; |
| 239 | num++; |
| 240 | } |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 241 | if(readfd1 != CURL_SOCKET_BAD) { |
| 242 | if(pfd[num].revents & (POLLRDNORM|POLLIN|POLLERR|POLLHUP)) |
| 243 | ret |= CURL_CSELECT_IN2; |
| 244 | if(pfd[num].revents & (POLLRDBAND|POLLPRI|POLLNVAL)) |
| 245 | ret |= CURL_CSELECT_ERR; |
| 246 | num++; |
| 247 | } |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 248 | if(writefd != CURL_SOCKET_BAD) { |
| 249 | if(pfd[num].revents & (POLLWRNORM|POLLOUT)) |
| 250 | ret |= CURL_CSELECT_OUT; |
| 251 | if(pfd[num].revents & (POLLERR|POLLHUP|POLLNVAL)) |
| 252 | ret |= CURL_CSELECT_ERR; |
| 253 | } |
| 254 | |
| 255 | return ret; |
| 256 | |
| 257 | #else /* HAVE_POLL_FINE */ |
| 258 | |
| 259 | FD_ZERO(&fds_err); |
| 260 | maxfd = (curl_socket_t)-1; |
| 261 | |
| 262 | FD_ZERO(&fds_read); |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 263 | if(readfd0 != CURL_SOCKET_BAD) { |
| 264 | VERIFY_SOCK(readfd0); |
| 265 | FD_SET(readfd0, &fds_read); |
| 266 | FD_SET(readfd0, &fds_err); |
| 267 | maxfd = readfd0; |
| 268 | } |
| 269 | if(readfd1 != CURL_SOCKET_BAD) { |
| 270 | VERIFY_SOCK(readfd1); |
| 271 | FD_SET(readfd1, &fds_read); |
| 272 | FD_SET(readfd1, &fds_err); |
| 273 | if(readfd1 > maxfd) |
| 274 | maxfd = readfd1; |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 275 | } |
| 276 | |
| 277 | FD_ZERO(&fds_write); |
| 278 | if(writefd != CURL_SOCKET_BAD) { |
| 279 | VERIFY_SOCK(writefd); |
| 280 | FD_SET(writefd, &fds_write); |
| 281 | FD_SET(writefd, &fds_err); |
| 282 | if(writefd > maxfd) |
| 283 | maxfd = writefd; |
| 284 | } |
| 285 | |
| 286 | ptimeout = (timeout_ms < 0) ? NULL : &pending_tv; |
| 287 | |
| 288 | do { |
| 289 | if(timeout_ms > 0) { |
| 290 | pending_tv.tv_sec = pending_ms / 1000; |
| 291 | pending_tv.tv_usec = (pending_ms % 1000) * 1000; |
| 292 | } |
| 293 | else if(!timeout_ms) { |
| 294 | pending_tv.tv_sec = 0; |
| 295 | pending_tv.tv_usec = 0; |
| 296 | } |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 297 | |
| 298 | /* WinSock select() must not be called with an fd_set that contains zero |
| 299 | fd flags, or it will return WSAEINVAL. But, it also can't be called |
| 300 | with no fd_sets at all! From the documentation: |
| 301 | |
| 302 | Any two of the parameters, readfds, writefds, or exceptfds, can be |
| 303 | given as null. At least one must be non-null, and any non-null |
| 304 | descriptor set must contain at least one handle to a socket. |
| 305 | |
| 306 | We know that we have at least one bit set in at least two fd_sets in |
| 307 | this case, but we may have no bits set in either fds_read or fd_write, |
| 308 | so check for that and handle it. Luckily, with WinSock, we can _also_ |
| 309 | ask how many bits are set on an fd_set. |
| 310 | |
| 311 | It is unclear why WinSock doesn't just handle this for us instead of |
| 312 | calling this an error. |
| 313 | |
| 314 | Note also that WinSock ignores the first argument, so we don't worry |
| 315 | about the fact that maxfd is computed incorrectly with WinSock (since |
| 316 | curl_socket_t is unsigned in such cases and thus -1 is the largest |
| 317 | value). |
| 318 | */ |
| 319 | r = select((int)maxfd + 1, |
| 320 | #ifndef USE_WINSOCK |
| 321 | &fds_read, |
| 322 | &fds_write, |
| 323 | #else |
| 324 | fds_read.fd_count ? &fds_read : NULL, |
| 325 | fds_write.fd_count ? &fds_write : NULL, |
| 326 | #endif |
| 327 | &fds_err, ptimeout); |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 328 | if(r != -1) |
| 329 | break; |
| 330 | error = SOCKERRNO; |
| 331 | if(error && error_not_EINTR) |
| 332 | break; |
| 333 | if(timeout_ms > 0) { |
| 334 | pending_ms = timeout_ms - elapsed_ms; |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 335 | if(pending_ms <= 0) { |
| 336 | r = 0; /* Simulate a "call timed out" case */ |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 337 | break; |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 338 | } |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 339 | } |
| 340 | } while(r == -1); |
| 341 | |
| 342 | if(r < 0) |
| 343 | return -1; |
| 344 | if(r == 0) |
| 345 | return 0; |
| 346 | |
| 347 | ret = 0; |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 348 | if(readfd0 != CURL_SOCKET_BAD) { |
| 349 | if(FD_ISSET(readfd0, &fds_read)) |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 350 | ret |= CURL_CSELECT_IN; |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 351 | if(FD_ISSET(readfd0, &fds_err)) |
| 352 | ret |= CURL_CSELECT_ERR; |
| 353 | } |
| 354 | if(readfd1 != CURL_SOCKET_BAD) { |
| 355 | if(FD_ISSET(readfd1, &fds_read)) |
| 356 | ret |= CURL_CSELECT_IN2; |
| 357 | if(FD_ISSET(readfd1, &fds_err)) |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 358 | ret |= CURL_CSELECT_ERR; |
| 359 | } |
| 360 | if(writefd != CURL_SOCKET_BAD) { |
| 361 | if(FD_ISSET(writefd, &fds_write)) |
| 362 | ret |= CURL_CSELECT_OUT; |
| 363 | if(FD_ISSET(writefd, &fds_err)) |
| 364 | ret |= CURL_CSELECT_ERR; |
| 365 | } |
| 366 | |
| 367 | return ret; |
| 368 | |
| 369 | #endif /* HAVE_POLL_FINE */ |
| 370 | |
| 371 | } |
| 372 | |
| 373 | /* |
| 374 | * This is a wrapper around poll(). If poll() does not exist, then |
| 375 | * select() is used instead. An error is returned if select() is |
| 376 | * being used and a file descriptor is too large for FD_SETSIZE. |
| 377 | * A negative timeout value makes this function wait indefinitely, |
| 378 | * unles no valid file descriptor is given, when this happens the |
| 379 | * negative timeout is ignored and the function times out immediately. |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 380 | * |
| 381 | * Return values: |
| 382 | * -1 = system call error or fd >= FD_SETSIZE |
| 383 | * 0 = timeout |
| 384 | * N = number of structures with non zero revent fields |
| 385 | */ |
| 386 | int Curl_poll(struct pollfd ufds[], unsigned int nfds, int timeout_ms) |
| 387 | { |
| 388 | #ifndef HAVE_POLL_FINE |
| 389 | struct timeval pending_tv; |
| 390 | struct timeval *ptimeout; |
| 391 | fd_set fds_read; |
| 392 | fd_set fds_write; |
| 393 | fd_set fds_err; |
| 394 | curl_socket_t maxfd; |
| 395 | #endif |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 396 | struct timeval initial_tv = {0, 0}; |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 397 | bool fds_none = TRUE; |
| 398 | unsigned int i; |
| 399 | int pending_ms = 0; |
| 400 | int error; |
| 401 | int r; |
| 402 | |
| 403 | if(ufds) { |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 404 | for(i = 0; i < nfds; i++) { |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 405 | if(ufds[i].fd != CURL_SOCKET_BAD) { |
| 406 | fds_none = FALSE; |
| 407 | break; |
| 408 | } |
| 409 | } |
| 410 | } |
| 411 | if(fds_none) { |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 412 | r = Curl_wait_ms(timeout_ms); |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 413 | return r; |
| 414 | } |
| 415 | |
| 416 | /* Avoid initial timestamp, avoid curlx_tvnow() call, when elapsed |
| 417 | time in this function does not need to be measured. This happens |
| 418 | when function is called with a zero timeout or a negative timeout |
| 419 | value indicating a blocking call should be performed. */ |
| 420 | |
| 421 | if(timeout_ms > 0) { |
| 422 | pending_ms = timeout_ms; |
| 423 | initial_tv = curlx_tvnow(); |
| 424 | } |
| 425 | |
| 426 | #ifdef HAVE_POLL_FINE |
| 427 | |
| 428 | do { |
| 429 | if(timeout_ms < 0) |
| 430 | pending_ms = -1; |
| 431 | else if(!timeout_ms) |
| 432 | pending_ms = 0; |
| 433 | r = poll(ufds, nfds, pending_ms); |
| 434 | if(r != -1) |
| 435 | break; |
| 436 | error = SOCKERRNO; |
| 437 | if(error && error_not_EINTR) |
| 438 | break; |
| 439 | if(timeout_ms > 0) { |
| 440 | pending_ms = timeout_ms - elapsed_ms; |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 441 | if(pending_ms <= 0) { |
| 442 | r = 0; /* Simulate a "call timed out" case */ |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 443 | break; |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 444 | } |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 445 | } |
| 446 | } while(r == -1); |
| 447 | |
| 448 | if(r < 0) |
| 449 | return -1; |
| 450 | if(r == 0) |
| 451 | return 0; |
| 452 | |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 453 | for(i = 0; i < nfds; i++) { |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 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 | |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 469 | for(i = 0; i < nfds; i++) { |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 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 | |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 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 | |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 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 | } |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 508 | r = select((int)maxfd + 1, |
| 509 | #ifndef USE_WINSOCK |
| 510 | &fds_read, &fds_write, &fds_err, |
| 511 | #else |
| 512 | /* WinSock select() can't handle fd_sets with zero bits set, so |
| 513 | don't give it such arguments. See the comment about this in |
| 514 | Curl_check_socket(). |
| 515 | */ |
| 516 | fds_read.fd_count ? &fds_read : NULL, |
| 517 | fds_write.fd_count ? &fds_write : NULL, |
| 518 | fds_err.fd_count ? &fds_err : NULL, |
| 519 | #endif |
| 520 | ptimeout); |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 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; |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 528 | if(pending_ms <= 0) { |
| 529 | r = 0; /* Simulate a "call timed out" case */ |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 530 | break; |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 531 | } |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 532 | } |
| 533 | } while(r == -1); |
| 534 | |
| 535 | if(r < 0) |
| 536 | return -1; |
| 537 | if(r == 0) |
| 538 | return 0; |
| 539 | |
| 540 | r = 0; |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 541 | for(i = 0; i < nfds; i++) { |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 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(); |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 576 | return rc; |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 577 | } |
| 578 | #endif /* TPF */ |