| 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 - 2017, Daniel Stenberg, <[email protected]>, 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 | #define ELAPSED_MS() (int)Curl_timediff(Curl_now(), initial_tv)
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| 55 |
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| 56 | int Curl_ack_eintr = 0;
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| 57 | #define ERROR_NOT_EINTR(error) (Curl_ack_eintr || error != EINTR)
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| 58 |
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| 59 | /*
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| 60 | * Internal function used for waiting a specific amount of ms
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| 61 | * in Curl_socket_check() and Curl_poll() when no file descriptor
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| 62 | * is provided to wait on, just being used to delay execution.
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| 63 | * WinSock select() and poll() timeout mechanisms need a valid
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| 64 | * socket descriptor in a not null file descriptor set to work.
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| 65 | * Waiting indefinitely with this function is not allowed, a
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| 66 | * zero or negative timeout value will return immediately.
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| 67 | * Timeout resolution, accuracy, as well as maximum supported
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| 68 | * value is system dependent, neither factor is a citical issue
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| 69 | * for the intended use of this function in the library.
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| 70 | *
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| 71 | * Return values:
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| 72 | * -1 = system call error, invalid timeout value, or interrupted
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| 73 | * 0 = specified timeout has elapsed
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| 74 | */
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| 75 | int Curl_wait_ms(int timeout_ms)
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| 76 | {
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| 77 | #if !defined(MSDOS) && !defined(USE_WINSOCK)
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| 78 | #ifndef HAVE_POLL_FINE
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| 79 | struct timeval pending_tv;
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| 80 | #endif
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| 81 | struct curltime initial_tv;
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| 82 | int pending_ms;
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| 83 | #endif
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| 84 | int r = 0;
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| 85 |
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| 86 | if(!timeout_ms)
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| 87 | return 0;
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| 88 | if(timeout_ms < 0) {
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| 89 | SET_SOCKERRNO(EINVAL);
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| 90 | return -1;
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| 91 | }
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| 92 | #if defined(MSDOS)
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| 93 | delay(timeout_ms);
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| 94 | #elif defined(USE_WINSOCK)
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| 95 | Sleep(timeout_ms);
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| 96 | #else
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| 97 | pending_ms = timeout_ms;
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| 98 | initial_tv = Curl_now();
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| 99 | do {
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| 100 | int error;
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| 101 | #if defined(HAVE_POLL_FINE)
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| 102 | r = poll(NULL, 0, pending_ms);
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| 103 | #else
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| 104 | pending_tv.tv_sec = pending_ms / 1000;
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| 105 | pending_tv.tv_usec = (pending_ms % 1000) * 1000;
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| 106 | r = select(0, NULL, NULL, NULL, &pending_tv);
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| 107 | #endif /* HAVE_POLL_FINE */
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| 108 | if(r != -1)
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| 109 | break;
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| 110 | error = SOCKERRNO;
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| 111 | if(error && ERROR_NOT_EINTR(error))
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| 112 | break;
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| 113 | pending_ms = timeout_ms - ELAPSED_MS();
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| 114 | if(pending_ms <= 0) {
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| 115 | r = 0; /* Simulate a "call timed out" case */
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| 116 | break;
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| 117 | }
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| 118 | } while(r == -1);
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| 119 | #endif /* USE_WINSOCK */
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| 120 | if(r)
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| 121 | r = -1;
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| 122 | return r;
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| 123 | }
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| 124 |
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| 125 | /*
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| 126 | * Wait for read or write events on a set of file descriptors. It uses poll()
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| 127 | * when a fine poll() is available, in order to avoid limits with FD_SETSIZE,
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| 128 | * otherwise select() is used. An error is returned if select() is being used
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| 129 | * and a file descriptor is too large for FD_SETSIZE.
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| 130 | *
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| 131 | * A negative timeout value makes this function wait indefinitely,
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| 132 | * unless no valid file descriptor is given, when this happens the
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| 133 | * negative timeout is ignored and the function times out immediately.
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| 134 | *
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| 135 | * Return values:
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| 136 | * -1 = system call error or fd >= FD_SETSIZE
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| 137 | * 0 = timeout
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| 138 | * [bitmask] = action as described below
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| 139 | *
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| 140 | * CURL_CSELECT_IN - first socket is readable
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| 141 | * CURL_CSELECT_IN2 - second socket is readable
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| 142 | * CURL_CSELECT_OUT - write socket is writable
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| 143 | * CURL_CSELECT_ERR - an error condition occurred
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| 144 | */
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| 145 | int Curl_socket_check(curl_socket_t readfd0, /* two sockets to read from */
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| 146 | curl_socket_t readfd1,
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| 147 | curl_socket_t writefd, /* socket to write to */
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| 148 | time_t timeout_ms) /* milliseconds to wait */
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| 149 | {
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| 150 | #ifdef HAVE_POLL_FINE
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| 151 | struct pollfd pfd[3];
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| 152 | int num;
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| 153 | #else
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| 154 | struct timeval pending_tv;
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| 155 | struct timeval *ptimeout;
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| 156 | fd_set fds_read;
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| 157 | fd_set fds_write;
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| 158 | fd_set fds_err;
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| 159 | curl_socket_t maxfd;
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| 160 | #endif
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| 161 | struct curltime initial_tv = {0, 0};
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| 162 | int pending_ms = 0;
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| 163 | int r;
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| 164 | int ret;
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| 165 |
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| 166 | #if SIZEOF_TIME_T != SIZEOF_INT
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| 167 | /* wrap-around precaution */
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| 168 | if(timeout_ms >= INT_MAX)
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| 169 | timeout_ms = INT_MAX;
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| 170 | #endif
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| 171 |
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| 172 | if((readfd0 == CURL_SOCKET_BAD) && (readfd1 == CURL_SOCKET_BAD) &&
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| 173 | (writefd == CURL_SOCKET_BAD)) {
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| 174 | /* no sockets, just wait */
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| 175 | r = Curl_wait_ms((int)timeout_ms);
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| 176 | return r;
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| 177 | }
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| 178 |
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| 179 | /* Avoid initial timestamp, avoid Curl_now() call, when elapsed
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| 180 | time in this function does not need to be measured. This happens
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| 181 | when function is called with a zero timeout or a negative timeout
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| 182 | value indicating a blocking call should be performed. */
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| 183 |
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| 184 | if(timeout_ms > 0) {
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| 185 | pending_ms = (int)timeout_ms;
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| 186 | initial_tv = Curl_now();
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| 187 | }
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| 188 |
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| 189 | #ifdef HAVE_POLL_FINE
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| 190 |
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| 191 | num = 0;
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| 192 | if(readfd0 != CURL_SOCKET_BAD) {
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| 193 | pfd[num].fd = readfd0;
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| 194 | pfd[num].events = POLLRDNORM|POLLIN|POLLRDBAND|POLLPRI;
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| 195 | pfd[num].revents = 0;
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| 196 | num++;
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| 197 | }
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| 198 | if(readfd1 != CURL_SOCKET_BAD) {
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| 199 | pfd[num].fd = readfd1;
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| 200 | pfd[num].events = POLLRDNORM|POLLIN|POLLRDBAND|POLLPRI;
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| 201 | pfd[num].revents = 0;
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| 202 | num++;
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| 203 | }
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| 204 | if(writefd != CURL_SOCKET_BAD) {
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| 205 | pfd[num].fd = writefd;
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| 206 | pfd[num].events = POLLWRNORM|POLLOUT;
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| 207 | pfd[num].revents = 0;
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| 208 | num++;
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| 209 | }
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| 210 |
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| 211 | do {
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| 212 | int error;
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| 213 | if(timeout_ms < 0)
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| 214 | pending_ms = -1;
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| 215 | else if(!timeout_ms)
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| 216 | pending_ms = 0;
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| 217 | r = poll(pfd, num, pending_ms);
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| 218 | if(r != -1)
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| 219 | break;
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| 220 | error = SOCKERRNO;
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| 221 | if(error && ERROR_NOT_EINTR(error))
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| 222 | break;
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| 223 | if(timeout_ms > 0) {
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| 224 | pending_ms = (int)(timeout_ms - ELAPSED_MS());
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| 225 | if(pending_ms <= 0) {
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| 226 | r = 0; /* Simulate a "call timed out" case */
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| 227 | break;
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| 228 | }
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| 229 | }
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| 230 | } while(r == -1);
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| 231 |
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| 232 | if(r < 0)
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| 233 | return -1;
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| 234 | if(r == 0)
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| 235 | return 0;
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| 236 |
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| 237 | ret = 0;
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| 238 | num = 0;
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| 239 | if(readfd0 != CURL_SOCKET_BAD) {
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| 240 | if(pfd[num].revents & (POLLRDNORM|POLLIN|POLLERR|POLLHUP))
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| 241 | ret |= CURL_CSELECT_IN;
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| 242 | if(pfd[num].revents & (POLLRDBAND|POLLPRI|POLLNVAL))
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| 243 | ret |= CURL_CSELECT_ERR;
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| 244 | num++;
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| 245 | }
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| 246 | if(readfd1 != CURL_SOCKET_BAD) {
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| 247 | if(pfd[num].revents & (POLLRDNORM|POLLIN|POLLERR|POLLHUP))
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| 248 | ret |= CURL_CSELECT_IN2;
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| 249 | if(pfd[num].revents & (POLLRDBAND|POLLPRI|POLLNVAL))
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| 250 | ret |= CURL_CSELECT_ERR;
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| 251 | num++;
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| 252 | }
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| 253 | if(writefd != CURL_SOCKET_BAD) {
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| 254 | if(pfd[num].revents & (POLLWRNORM|POLLOUT))
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| 255 | ret |= CURL_CSELECT_OUT;
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| 256 | if(pfd[num].revents & (POLLERR|POLLHUP|POLLNVAL))
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| 257 | ret |= CURL_CSELECT_ERR;
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| 258 | }
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| 259 |
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| 260 | return ret;
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| 261 |
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| 262 | #else /* HAVE_POLL_FINE */
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| 263 |
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| 264 | FD_ZERO(&fds_err);
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| 265 | maxfd = (curl_socket_t)-1;
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| 266 |
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| 267 | FD_ZERO(&fds_read);
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| 268 | if(readfd0 != CURL_SOCKET_BAD) {
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| 269 | VERIFY_SOCK(readfd0);
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| 270 | FD_SET(readfd0, &fds_read);
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| 271 | FD_SET(readfd0, &fds_err);
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| 272 | maxfd = readfd0;
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| 273 | }
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| 274 | if(readfd1 != CURL_SOCKET_BAD) {
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| 275 | VERIFY_SOCK(readfd1);
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| 276 | FD_SET(readfd1, &fds_read);
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| 277 | FD_SET(readfd1, &fds_err);
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| 278 | if(readfd1 > maxfd)
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| 279 | maxfd = readfd1;
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| 280 | }
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| 281 |
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| 282 | FD_ZERO(&fds_write);
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| 283 | if(writefd != CURL_SOCKET_BAD) {
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| 284 | VERIFY_SOCK(writefd);
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| 285 | FD_SET(writefd, &fds_write);
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| 286 | FD_SET(writefd, &fds_err);
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| 287 | if(writefd > maxfd)
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| 288 | maxfd = writefd;
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| 289 | }
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| 290 |
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| 291 | ptimeout = (timeout_ms < 0) ? NULL : &pending_tv;
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| 292 |
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| 293 | do {
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| 294 | int error;
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| 295 | if(timeout_ms > 0) {
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| 296 | pending_tv.tv_sec = pending_ms / 1000;
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| 297 | pending_tv.tv_usec = (pending_ms % 1000) * 1000;
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| 298 | }
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| 299 | else if(!timeout_ms) {
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| 300 | pending_tv.tv_sec = 0;
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| 301 | pending_tv.tv_usec = 0;
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| 302 | }
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| 303 |
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| 304 | /* WinSock select() must not be called with an fd_set that contains zero
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| 305 | fd flags, or it will return WSAEINVAL. But, it also can't be called
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| 306 | with no fd_sets at all! From the documentation:
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| 307 |
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| 308 | Any two of the parameters, readfds, writefds, or exceptfds, can be
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| 309 | given as null. At least one must be non-null, and any non-null
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| 310 | descriptor set must contain at least one handle to a socket.
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| 311 |
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| 312 | We know that we have at least one bit set in at least two fd_sets in
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| 313 | this case, but we may have no bits set in either fds_read or fd_write,
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| 314 | so check for that and handle it. Luckily, with WinSock, we can _also_
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| 315 | ask how many bits are set on an fd_set.
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| 316 |
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| 317 | It is unclear why WinSock doesn't just handle this for us instead of
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| 318 | calling this an error.
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| 319 |
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| 320 | Note also that WinSock ignores the first argument, so we don't worry
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| 321 | about the fact that maxfd is computed incorrectly with WinSock (since
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| 322 | curl_socket_t is unsigned in such cases and thus -1 is the largest
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| 323 | value).
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| 324 | */
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| 325 | #ifdef USE_WINSOCK
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| 326 | r = select((int)maxfd + 1,
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| 327 | fds_read.fd_count ? &fds_read : NULL,
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| 328 | fds_write.fd_count ? &fds_write : NULL,
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| 329 | &fds_err, ptimeout);
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| 330 | #else
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| 331 | r = select((int)maxfd + 1, &fds_read, &fds_write, &fds_err, ptimeout);
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| 332 | #endif
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| 333 |
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| 334 | if(r != -1)
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| 335 | break;
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| 336 | error = SOCKERRNO;
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| 337 | if(error && ERROR_NOT_EINTR(error))
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| 338 | break;
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| 339 | if(timeout_ms > 0) {
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| 340 | pending_ms = (int)(timeout_ms - ELAPSED_MS());
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| 341 | if(pending_ms <= 0) {
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| 342 | r = 0; /* Simulate a "call timed out" case */
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| 343 | break;
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| 344 | }
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| 345 | }
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| 346 | } while(r == -1);
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| 347 |
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| 348 | if(r < 0)
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| 349 | return -1;
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| 350 | if(r == 0)
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| 351 | return 0;
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| 352 |
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| 353 | ret = 0;
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| 354 | if(readfd0 != CURL_SOCKET_BAD) {
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| 355 | if(FD_ISSET(readfd0, &fds_read))
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| 356 | ret |= CURL_CSELECT_IN;
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| 357 | if(FD_ISSET(readfd0, &fds_err))
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| 358 | ret |= CURL_CSELECT_ERR;
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| 359 | }
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| 360 | if(readfd1 != CURL_SOCKET_BAD) {
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| 361 | if(FD_ISSET(readfd1, &fds_read))
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| 362 | ret |= CURL_CSELECT_IN2;
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| 363 | if(FD_ISSET(readfd1, &fds_err))
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| 364 | ret |= CURL_CSELECT_ERR;
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| 365 | }
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| 366 | if(writefd != CURL_SOCKET_BAD) {
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| 367 | if(FD_ISSET(writefd, &fds_write))
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| 368 | ret |= CURL_CSELECT_OUT;
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| 369 | if(FD_ISSET(writefd, &fds_err))
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| 370 | ret |= CURL_CSELECT_ERR;
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| 371 | }
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| 372 |
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| 373 | return ret;
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| 374 |
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| 375 | #endif /* HAVE_POLL_FINE */
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| 376 |
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| 377 | }
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| 378 |
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| 379 | /*
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| 380 | * This is a wrapper around poll(). If poll() does not exist, then
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| 381 | * select() is used instead. An error is returned if select() is
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| 382 | * being used and a file descriptor is too large for FD_SETSIZE.
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| 383 | * A negative timeout value makes this function wait indefinitely,
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| 384 | * unless no valid file descriptor is given, when this happens the
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| 385 | * negative timeout is ignored and the function times out immediately.
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| 386 | *
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| 387 | * Return values:
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| 388 | * -1 = system call error or fd >= FD_SETSIZE
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| 389 | * 0 = timeout
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| 390 | * N = number of structures with non zero revent fields
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| 391 | */
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| 392 | int Curl_poll(struct pollfd ufds[], unsigned int nfds, int timeout_ms)
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| 393 | {
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| 394 | #ifndef HAVE_POLL_FINE
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| 395 | struct timeval pending_tv;
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| 396 | struct timeval *ptimeout;
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| 397 | fd_set fds_read;
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| 398 | fd_set fds_write;
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| 399 | fd_set fds_err;
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| 400 | curl_socket_t maxfd;
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| 401 | #endif
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| 402 | struct curltime initial_tv = {0, 0};
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| 403 | bool fds_none = TRUE;
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| 404 | unsigned int i;
|
|---|
| 405 | int pending_ms = 0;
|
|---|
| 406 | int r;
|
|---|
| 407 |
|
|---|
| 408 | if(ufds) {
|
|---|
| 409 | for(i = 0; i < nfds; i++) {
|
|---|
| 410 | if(ufds[i].fd != CURL_SOCKET_BAD) {
|
|---|
| 411 | fds_none = FALSE;
|
|---|
| 412 | break;
|
|---|
| 413 | }
|
|---|
| 414 | }
|
|---|
| 415 | }
|
|---|
| 416 | if(fds_none) {
|
|---|
| 417 | r = Curl_wait_ms(timeout_ms);
|
|---|
| 418 | return r;
|
|---|
| 419 | }
|
|---|
| 420 |
|
|---|
| 421 | /* Avoid initial timestamp, avoid Curl_now() call, when elapsed
|
|---|
| 422 | time in this function does not need to be measured. This happens
|
|---|
| 423 | when function is called with a zero timeout or a negative timeout
|
|---|
| 424 | value indicating a blocking call should be performed. */
|
|---|
| 425 |
|
|---|
| 426 | if(timeout_ms > 0) {
|
|---|
| 427 | pending_ms = timeout_ms;
|
|---|
| 428 | initial_tv = Curl_now();
|
|---|
| 429 | }
|
|---|
| 430 |
|
|---|
| 431 | #ifdef HAVE_POLL_FINE
|
|---|
| 432 |
|
|---|
| 433 | do {
|
|---|
| 434 | int error;
|
|---|
| 435 | if(timeout_ms < 0)
|
|---|
| 436 | pending_ms = -1;
|
|---|
| 437 | else if(!timeout_ms)
|
|---|
| 438 | pending_ms = 0;
|
|---|
| 439 | r = poll(ufds, nfds, pending_ms);
|
|---|
| 440 | if(r != -1)
|
|---|
| 441 | break;
|
|---|
| 442 | error = SOCKERRNO;
|
|---|
| 443 | if(error && ERROR_NOT_EINTR(error))
|
|---|
| 444 | break;
|
|---|
| 445 | if(timeout_ms > 0) {
|
|---|
| 446 | pending_ms = (int)(timeout_ms - ELAPSED_MS());
|
|---|
| 447 | if(pending_ms <= 0) {
|
|---|
| 448 | r = 0; /* Simulate a "call timed out" case */
|
|---|
| 449 | break;
|
|---|
| 450 | }
|
|---|
| 451 | }
|
|---|
| 452 | } while(r == -1);
|
|---|
| 453 |
|
|---|
| 454 | if(r < 0)
|
|---|
| 455 | return -1;
|
|---|
| 456 | if(r == 0)
|
|---|
| 457 | return 0;
|
|---|
| 458 |
|
|---|
| 459 | for(i = 0; i < nfds; i++) {
|
|---|
| 460 | if(ufds[i].fd == CURL_SOCKET_BAD)
|
|---|
| 461 | continue;
|
|---|
| 462 | if(ufds[i].revents & POLLHUP)
|
|---|
| 463 | ufds[i].revents |= POLLIN;
|
|---|
| 464 | if(ufds[i].revents & POLLERR)
|
|---|
| 465 | ufds[i].revents |= (POLLIN|POLLOUT);
|
|---|
| 466 | }
|
|---|
| 467 |
|
|---|
| 468 | #else /* HAVE_POLL_FINE */
|
|---|
| 469 |
|
|---|
| 470 | FD_ZERO(&fds_read);
|
|---|
| 471 | FD_ZERO(&fds_write);
|
|---|
| 472 | FD_ZERO(&fds_err);
|
|---|
| 473 | maxfd = (curl_socket_t)-1;
|
|---|
| 474 |
|
|---|
| 475 | for(i = 0; i < nfds; i++) {
|
|---|
| 476 | ufds[i].revents = 0;
|
|---|
| 477 | if(ufds[i].fd == CURL_SOCKET_BAD)
|
|---|
| 478 | continue;
|
|---|
| 479 | VERIFY_SOCK(ufds[i].fd);
|
|---|
| 480 | if(ufds[i].events & (POLLIN|POLLOUT|POLLPRI|
|
|---|
| 481 | POLLRDNORM|POLLWRNORM|POLLRDBAND)) {
|
|---|
| 482 | if(ufds[i].fd > maxfd)
|
|---|
| 483 | maxfd = ufds[i].fd;
|
|---|
| 484 | if(ufds[i].events & (POLLRDNORM|POLLIN))
|
|---|
| 485 | FD_SET(ufds[i].fd, &fds_read);
|
|---|
| 486 | if(ufds[i].events & (POLLWRNORM|POLLOUT))
|
|---|
| 487 | FD_SET(ufds[i].fd, &fds_write);
|
|---|
| 488 | if(ufds[i].events & (POLLRDBAND|POLLPRI))
|
|---|
| 489 | FD_SET(ufds[i].fd, &fds_err);
|
|---|
| 490 | }
|
|---|
| 491 | }
|
|---|
| 492 |
|
|---|
| 493 | #ifdef USE_WINSOCK
|
|---|
| 494 | /* WinSock select() can't handle zero events. See the comment about this in
|
|---|
| 495 | Curl_check_socket(). */
|
|---|
| 496 | if(fds_read.fd_count == 0 && fds_write.fd_count == 0
|
|---|
| 497 | && fds_err.fd_count == 0) {
|
|---|
| 498 | r = Curl_wait_ms(timeout_ms);
|
|---|
| 499 | return r;
|
|---|
| 500 | }
|
|---|
| 501 | #endif
|
|---|
| 502 |
|
|---|
| 503 | ptimeout = (timeout_ms < 0) ? NULL : &pending_tv;
|
|---|
| 504 |
|
|---|
| 505 | do {
|
|---|
| 506 | int error;
|
|---|
| 507 | if(timeout_ms > 0) {
|
|---|
| 508 | pending_tv.tv_sec = pending_ms / 1000;
|
|---|
| 509 | pending_tv.tv_usec = (pending_ms % 1000) * 1000;
|
|---|
| 510 | }
|
|---|
| 511 | else if(!timeout_ms) {
|
|---|
| 512 | pending_tv.tv_sec = 0;
|
|---|
| 513 | pending_tv.tv_usec = 0;
|
|---|
| 514 | }
|
|---|
| 515 |
|
|---|
| 516 | #ifdef USE_WINSOCK
|
|---|
| 517 | r = select((int)maxfd + 1,
|
|---|
| 518 | /* WinSock select() can't handle fd_sets with zero bits set, so
|
|---|
| 519 | don't give it such arguments. See the comment about this in
|
|---|
| 520 | Curl_check_socket().
|
|---|
| 521 | */
|
|---|
| 522 | fds_read.fd_count ? &fds_read : NULL,
|
|---|
| 523 | fds_write.fd_count ? &fds_write : NULL,
|
|---|
| 524 | fds_err.fd_count ? &fds_err : NULL, ptimeout);
|
|---|
| 525 | #else
|
|---|
| 526 | r = select((int)maxfd + 1, &fds_read, &fds_write, &fds_err, ptimeout);
|
|---|
| 527 | #endif
|
|---|
| 528 | if(r != -1)
|
|---|
| 529 | break;
|
|---|
| 530 | error = SOCKERRNO;
|
|---|
| 531 | if(error && ERROR_NOT_EINTR(error))
|
|---|
| 532 | break;
|
|---|
| 533 | if(timeout_ms > 0) {
|
|---|
| 534 | pending_ms = timeout_ms - ELAPSED_MS();
|
|---|
| 535 | if(pending_ms <= 0) {
|
|---|
| 536 | r = 0; /* Simulate a "call timed out" case */
|
|---|
| 537 | break;
|
|---|
| 538 | }
|
|---|
| 539 | }
|
|---|
| 540 | } while(r == -1);
|
|---|
| 541 |
|
|---|
| 542 | if(r < 0)
|
|---|
| 543 | return -1;
|
|---|
| 544 | if(r == 0)
|
|---|
| 545 | return 0;
|
|---|
| 546 |
|
|---|
| 547 | r = 0;
|
|---|
| 548 | for(i = 0; i < nfds; i++) {
|
|---|
| 549 | ufds[i].revents = 0;
|
|---|
| 550 | if(ufds[i].fd == CURL_SOCKET_BAD)
|
|---|
| 551 | continue;
|
|---|
| 552 | if(FD_ISSET(ufds[i].fd, &fds_read))
|
|---|
| 553 | ufds[i].revents |= POLLIN;
|
|---|
| 554 | if(FD_ISSET(ufds[i].fd, &fds_write))
|
|---|
| 555 | ufds[i].revents |= POLLOUT;
|
|---|
| 556 | if(FD_ISSET(ufds[i].fd, &fds_err))
|
|---|
| 557 | ufds[i].revents |= POLLPRI;
|
|---|
| 558 | if(ufds[i].revents != 0)
|
|---|
| 559 | r++;
|
|---|
| 560 | }
|
|---|
| 561 |
|
|---|
| 562 | #endif /* HAVE_POLL_FINE */
|
|---|
| 563 |
|
|---|
| 564 | return r;
|
|---|
| 565 | }
|
|---|
| 566 |
|
|---|
| 567 | #ifdef TPF
|
|---|
| 568 | /*
|
|---|
| 569 | * This is a replacement for select() on the TPF platform.
|
|---|
| 570 | * It is used whenever libcurl calls select().
|
|---|
| 571 | * The call below to tpf_process_signals() is required because
|
|---|
| 572 | * TPF's select calls are not signal interruptible.
|
|---|
| 573 | *
|
|---|
| 574 | * Return values are the same as select's.
|
|---|
| 575 | */
|
|---|
| 576 | int tpf_select_libcurl(int maxfds, fd_set *reads, fd_set *writes,
|
|---|
| 577 | fd_set *excepts, struct timeval *tv)
|
|---|
| 578 | {
|
|---|
| 579 | int rc;
|
|---|
| 580 |
|
|---|
| 581 | rc = tpf_select_bsd(maxfds, reads, writes, excepts, tv);
|
|---|
| 582 | tpf_process_signals();
|
|---|
| 583 | return rc;
|
|---|
| 584 | }
|
|---|
| 585 | #endif /* TPF */
|
|---|
