869d192ffc
to complete with no delay and actually find out what happened with the socket. As well as detection of socket send()able condition. This also allows removal of a Cygwin specific block of code.
632 lines
17 KiB
C
632 lines
17 KiB
C
/***************************************************************************
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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* Copyright (C) 1998 - 2007, Daniel Stenberg, <daniel@haxx.se>, et al.
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*
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* This software is licensed as described in the file COPYING, which
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* you should have received as part of this distribution. The terms
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* are also available at http://curl.haxx.se/docs/copyright.html.
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*
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* You may opt to use, copy, modify, merge, publish, distribute and/or sell
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* copies of the Software, and permit persons to whom the Software is
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* furnished to do so, under the terms of the COPYING file.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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* $Id$
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***************************************************************************/
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#include "setup.h"
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#include <errno.h>
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#ifdef HAVE_SYS_SELECT_H
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#include <sys/select.h>
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#endif
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#ifdef HAVE_SYS_TIME_H
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#include <sys/time.h>
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#endif
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#if !defined(HAVE_SELECT) && !defined(HAVE_POLL_FINE)
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#error "We can't compile without select() or poll() support."
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#endif
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#ifdef __BEOS__
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/* BeOS has FD_SET defined in socket.h */
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#include <socket.h>
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#endif
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#ifdef __MSDOS__
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#include <dos.h> /* delay() */
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#endif
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#include <curl/curl.h>
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#include "urldata.h"
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#include "connect.h"
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#include "select.h"
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#ifdef USE_WINSOCK
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# undef EBADF
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# define EBADF WSAEBADF
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# undef EINTR
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# define EINTR WSAEINTR
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# undef EINVAL
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# define EINVAL WSAEINVAL
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#endif
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/* Winsock and TPF sockets are not in range [0..FD_SETSIZE-1] */
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#if defined(USE_WINSOCK) || defined(TPF)
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#define VERIFY_SOCK(x) do { } while (0)
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#define VERIFY_NFDS(x) do { } while (0)
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#else
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#define VALID_SOCK(s) (((s) >= 0) && ((s) < FD_SETSIZE))
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#define VERIFY_SOCK(x) do { \
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if(!VALID_SOCK(x)) { \
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SET_SOCKERRNO(EINVAL); \
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return -1; \
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} \
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} while(0)
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#define VALID_NFDS(n) (((n) >= 0) && ((n) <= FD_SETSIZE))
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#define VERIFY_NFDS(x) do { \
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if(!VALID_NFDS(x)) { \
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SET_SOCKERRNO(EINVAL); \
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return -1; \
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} \
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} while(0)
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#endif
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/* Convenience local macros */
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#define elapsed_ms (int)curlx_tvdiff(curlx_tvnow(), initial_tv)
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#ifdef CURL_ACKNOWLEDGE_EINTR
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#define error_not_EINTR (error != EINTR)
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#else
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#define error_not_EINTR (1)
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#endif
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#define SMALL_POLLNFDS 0X20
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/*
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* Internal function used for waiting a specific amount of ms
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* in Curl_socket_ready() and Curl_poll() when no file descriptor
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* is provided to wait on, just being used to delay execution.
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* WinSock select() and poll() timeout mechanisms need a valid
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* socket descriptor in a not null file descriptor set to work.
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* Waiting indefinitely with this function is not allowed, a
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* zero or negative timeout value will return immediately.
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* Timeout resolution, accuracy, as well as maximum supported
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* value is system dependant, neither factor is a citical issue
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* for the intended use of this function in the library.
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* On non-DOS and non-Winsock platforms, when compiled with
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* CURL_ACKNOWLEDGE_EINTR defined, EINTR condition is honored
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* and function might exit early without awaiting full timeout,
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* otherwise EINTR will be ignored and full timeout will elapse.
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*
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* Return values:
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* -1 = system call error, invalid timeout value, or interrupted
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* 0 = specified timeout has elapsed
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*/
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static int wait_ms(int timeout_ms)
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{
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#if !defined(__MSDOS__) && !defined(USE_WINSOCK)
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#ifndef HAVE_POLL_FINE
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struct timeval pending_tv;
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#endif
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struct timeval initial_tv;
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int pending_ms;
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int error;
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#endif
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int r = 0;
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if (!timeout_ms)
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return 0;
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if (timeout_ms < 0) {
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SET_SOCKERRNO(EINVAL);
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return -1;
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}
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#if defined(__MSDOS__)
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delay(timeout_ms);
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#elif defined(USE_WINSOCK)
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Sleep(timeout_ms);
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#else
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pending_ms = timeout_ms;
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initial_tv = curlx_tvnow();
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do {
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#if defined(HAVE_POLL_FINE)
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r = poll(NULL, 0, pending_ms);
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#else
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pending_tv.tv_sec = pending_ms / 1000;
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pending_tv.tv_usec = (pending_ms % 1000) * 1000;
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r = select(0, NULL, NULL, NULL, &pending_tv);
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#endif /* HAVE_POLL_FINE */
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} while ((r == -1) && (error = SOCKERRNO) &&
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(error != EINVAL) && error_not_EINTR &&
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((pending_ms = timeout_ms - elapsed_ms) > 0));
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#endif /* USE_WINSOCK */
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if (r)
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r = -1;
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return r;
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}
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/*
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* This is an internal function used for waiting for read or write
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* events on a pair of file descriptors. It uses poll() when a fine
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* poll() is available, in order to avoid limits with FD_SETSIZE,
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* otherwise select() is used. An error is returned if select() is
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* being used and a file descriptor is too large for FD_SETSIZE.
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* A negative timeout value makes this function wait indefinitely,
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* unles no valid file descriptor is given, when this happens the
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* negative timeout is ignored and the function times out immediately.
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* When compiled with CURL_ACKNOWLEDGE_EINTR defined, EINTR condition
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* is honored and function might exit early without awaiting timeout,
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* otherwise EINTR will be ignored.
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*
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* Return values:
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* -1 = system call error or fd >= FD_SETSIZE
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* 0 = timeout
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* CSELECT_IN | CSELECT_OUT | CSELECT_ERR
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*/
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int Curl_socket_ready(curl_socket_t readfd, curl_socket_t writefd, int timeout_ms)
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{
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#ifdef HAVE_POLL_FINE
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struct pollfd pfd[2];
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int num;
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#else
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struct timeval pending_tv;
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struct timeval *ptimeout;
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fd_set fds_read;
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fd_set fds_write;
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fd_set fds_err;
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curl_socket_t maxfd;
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#endif
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struct timeval initial_tv;
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int pending_ms;
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int error;
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int r;
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int ret;
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if((readfd == CURL_SOCKET_BAD) && (writefd == CURL_SOCKET_BAD)) {
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r = wait_ms(timeout_ms);
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return r;
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}
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pending_ms = timeout_ms;
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initial_tv = curlx_tvnow();
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#ifdef HAVE_POLL_FINE
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num = 0;
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if (readfd != CURL_SOCKET_BAD) {
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pfd[num].fd = readfd;
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pfd[num].events = POLLRDNORM|POLLIN|POLLRDBAND|POLLPRI;
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pfd[num].revents = 0;
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num++;
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}
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if (writefd != CURL_SOCKET_BAD) {
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pfd[num].fd = writefd;
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pfd[num].events = POLLWRNORM|POLLOUT;
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pfd[num].revents = 0;
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num++;
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}
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do {
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if (timeout_ms < 0)
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pending_ms = -1;
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r = poll(pfd, num, pending_ms);
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} while ((r == -1) && (error = SOCKERRNO) &&
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(error != EINVAL) && error_not_EINTR &&
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((timeout_ms < 0) || ((pending_ms = timeout_ms - elapsed_ms) > 0)));
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if (r < 0)
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return -1;
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if (r == 0)
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return 0;
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ret = 0;
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num = 0;
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if (readfd != CURL_SOCKET_BAD) {
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if (pfd[num].revents & (POLLRDNORM|POLLIN|POLLERR|POLLHUP))
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ret |= CSELECT_IN;
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if (pfd[num].revents & (POLLRDBAND|POLLPRI|POLLNVAL))
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ret |= CSELECT_ERR;
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}
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if (writefd != CURL_SOCKET_BAD) {
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if (pfd[num].revents & (POLLWRNORM|POLLOUT))
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ret |= CSELECT_OUT;
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if (pfd[num].revents & (POLLERR|POLLHUP|POLLNVAL))
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ret |= CSELECT_ERR;
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}
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return ret;
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#else /* HAVE_POLL_FINE */
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FD_ZERO(&fds_err);
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maxfd = (curl_socket_t)-1;
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FD_ZERO(&fds_read);
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if (readfd != CURL_SOCKET_BAD) {
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VERIFY_SOCK(readfd);
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FD_SET(readfd, &fds_read);
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FD_SET(readfd, &fds_err);
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maxfd = readfd;
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}
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FD_ZERO(&fds_write);
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if (writefd != CURL_SOCKET_BAD) {
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VERIFY_SOCK(writefd);
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FD_SET(writefd, &fds_write);
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FD_SET(writefd, &fds_err);
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if (writefd > maxfd)
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maxfd = writefd;
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}
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ptimeout = (timeout_ms < 0) ? NULL : &pending_tv;
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do {
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if (ptimeout) {
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pending_tv.tv_sec = pending_ms / 1000;
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pending_tv.tv_usec = (pending_ms % 1000) * 1000;
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}
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r = select((int)maxfd + 1, &fds_read, &fds_write, &fds_err, ptimeout);
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} while ((r == -1) && (error = SOCKERRNO) &&
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(error != EINVAL) && (error != EBADF) && error_not_EINTR &&
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((timeout_ms < 0) || ((pending_ms = timeout_ms - elapsed_ms) > 0)));
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if (r < 0)
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return -1;
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if (r == 0)
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return 0;
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ret = 0;
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if (readfd != CURL_SOCKET_BAD) {
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if (FD_ISSET(readfd, &fds_read))
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ret |= CSELECT_IN;
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if (FD_ISSET(readfd, &fds_err))
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ret |= CSELECT_ERR;
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}
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if (writefd != CURL_SOCKET_BAD) {
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if (FD_ISSET(writefd, &fds_write))
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ret |= CSELECT_OUT;
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if (FD_ISSET(writefd, &fds_err))
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ret |= CSELECT_ERR;
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}
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return ret;
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#endif /* HAVE_POLL_FINE */
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}
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/*
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* This is a wrapper around poll(). If poll() does not exist, then
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* select() is used instead. An error is returned if select() is
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* being used and a file descriptor is too large for FD_SETSIZE.
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* A negative timeout value makes this function wait indefinitely,
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* unles no valid file descriptor is given, when this happens the
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* negative timeout is ignored and the function times out immediately.
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* When compiled with CURL_ACKNOWLEDGE_EINTR defined, EINTR condition
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* is honored and function might exit early without awaiting timeout,
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* otherwise EINTR will be ignored.
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*
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* Return values:
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* -1 = system call error or fd >= FD_SETSIZE
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* 0 = timeout
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* N = number of structures with non zero revent fields
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*/
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int Curl_poll(struct pollfd ufds[], unsigned int nfds, int timeout_ms)
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{
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#ifndef HAVE_POLL_FINE
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struct timeval pending_tv;
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struct timeval *ptimeout;
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fd_set fds_read;
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fd_set fds_write;
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fd_set fds_err;
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curl_socket_t maxfd;
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#endif
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struct timeval initial_tv;
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bool fds_none = TRUE;
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unsigned int i;
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int pending_ms;
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int error;
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int r;
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if (ufds) {
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for (i = 0; i < nfds; i++) {
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if (ufds[i].fd != CURL_SOCKET_BAD) {
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fds_none = FALSE;
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break;
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}
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}
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}
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if (fds_none) {
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r = wait_ms(timeout_ms);
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return r;
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}
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pending_ms = timeout_ms;
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initial_tv = curlx_tvnow();
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#ifdef HAVE_POLL_FINE
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do {
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if (timeout_ms < 0)
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pending_ms = -1;
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r = poll(ufds, nfds, pending_ms);
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} while ((r == -1) && (error = SOCKERRNO) &&
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(error != EINVAL) && error_not_EINTR &&
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((timeout_ms < 0) || ((pending_ms = timeout_ms - elapsed_ms) > 0)));
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#else /* HAVE_POLL_FINE */
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FD_ZERO(&fds_read);
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FD_ZERO(&fds_write);
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FD_ZERO(&fds_err);
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maxfd = (curl_socket_t)-1;
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for (i = 0; i < nfds; i++) {
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ufds[i].revents = 0;
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if (ufds[i].fd == CURL_SOCKET_BAD)
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continue;
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VERIFY_SOCK(ufds[i].fd);
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if (ufds[i].events & (POLLIN|POLLOUT|POLLPRI|
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POLLRDNORM|POLLWRNORM|POLLRDBAND)) {
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if (ufds[i].fd > maxfd)
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maxfd = ufds[i].fd;
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if (ufds[i].events & (POLLRDNORM|POLLIN))
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FD_SET(ufds[i].fd, &fds_read);
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if (ufds[i].events & (POLLWRNORM|POLLOUT))
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FD_SET(ufds[i].fd, &fds_write);
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if (ufds[i].events & (POLLRDBAND|POLLPRI))
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FD_SET(ufds[i].fd, &fds_err);
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}
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}
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ptimeout = (timeout_ms < 0) ? NULL : &pending_tv;
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do {
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if (ptimeout) {
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pending_tv.tv_sec = pending_ms / 1000;
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pending_tv.tv_usec = (pending_ms % 1000) * 1000;
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}
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r = select((int)maxfd + 1, &fds_read, &fds_write, &fds_err, ptimeout);
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} while ((r == -1) && (error = SOCKERRNO) &&
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(error != EINVAL) && (error != EBADF) && error_not_EINTR &&
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((timeout_ms < 0) || ((pending_ms = timeout_ms - elapsed_ms) > 0)));
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if (r < 0)
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return -1;
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if (r == 0)
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return 0;
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r = 0;
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for (i = 0; i < nfds; i++) {
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ufds[i].revents = 0;
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if (ufds[i].fd == CURL_SOCKET_BAD)
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continue;
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if (FD_ISSET(ufds[i].fd, &fds_read))
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ufds[i].revents |= POLLIN;
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if (FD_ISSET(ufds[i].fd, &fds_write))
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ufds[i].revents |= POLLOUT;
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if (FD_ISSET(ufds[i].fd, &fds_err))
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ufds[i].revents |= POLLPRI;
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if (ufds[i].revents != 0)
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r++;
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}
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#endif /* HAVE_POLL_FINE */
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return r;
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}
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|
|
/*
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|
* This is a wrapper around select(). It uses poll() when a fine
|
|
* poll() is available, in order to avoid limits with FD_SETSIZE,
|
|
* otherwise select() is used. An error is returned if select() is
|
|
* being used and a the number of file descriptors is larger than
|
|
* FD_SETSIZE. A NULL timeout pointer makes this function wait
|
|
* indefinitely, unles no valid file descriptor is given, when this
|
|
* happens the NULL timeout is ignored and the function times out
|
|
* immediately. When compiled with CURL_ACKNOWLEDGE_EINTR defined,
|
|
* EINTR condition is honored and function might exit early without
|
|
* awaiting timeout, otherwise EINTR will be ignored.
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|
*
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|
* Return values:
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|
* -1 = system call error or nfds > FD_SETSIZE
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|
* 0 = timeout
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|
* N = number of file descriptors kept in file descriptor sets.
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*/
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int Curl_select(int nfds,
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fd_set *fds_read, fd_set *fds_write, fd_set *fds_excep,
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struct timeval *timeout)
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|
{
|
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struct timeval initial_tv;
|
|
int timeout_ms;
|
|
int pending_ms;
|
|
int error;
|
|
int r;
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|
#ifdef HAVE_POLL_FINE
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|
struct pollfd small_fds[SMALL_POLLNFDS];
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|
struct pollfd *poll_fds;
|
|
int ix;
|
|
int fd;
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|
int poll_nfds = 0;
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|
#else
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|
struct timeval pending_tv;
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|
struct timeval *ptimeout;
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|
#endif
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int ret = 0;
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if ((nfds < 0) ||
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((nfds > 0) && (!fds_read && !fds_write && !fds_excep))) {
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SET_SOCKERRNO(EINVAL);
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return -1;
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}
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if (timeout) {
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if ((timeout->tv_sec < 0) ||
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(timeout->tv_usec < 0) ||
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(timeout->tv_usec >= 1000000)) {
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SET_SOCKERRNO(EINVAL);
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return -1;
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}
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timeout_ms = (timeout->tv_sec * 1000) + (timeout->tv_usec / 1000);
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}
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else {
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timeout_ms = -1;
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}
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|
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if ((!nfds) || (!fds_read && !fds_write && !fds_excep)) {
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r = wait_ms(timeout_ms);
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return r;
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}
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pending_ms = timeout_ms;
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initial_tv = curlx_tvnow();
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|
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#ifdef HAVE_POLL_FINE
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if (fds_read || fds_write || fds_excep) {
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fd = nfds;
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while (fd--) {
|
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if ((fds_read && (0 != FD_ISSET(fd, fds_read))) ||
|
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(fds_write && (0 != FD_ISSET(fd, fds_write))) ||
|
|
(fds_excep && (0 != FD_ISSET(fd, fds_excep))))
|
|
poll_nfds++;
|
|
}
|
|
}
|
|
|
|
if (!poll_nfds)
|
|
poll_fds = NULL;
|
|
else if (poll_nfds <= SMALL_POLLNFDS)
|
|
poll_fds = small_fds;
|
|
else {
|
|
poll_fds = calloc((size_t)poll_nfds, sizeof(struct pollfd));
|
|
if (!poll_fds) {
|
|
SET_SOCKERRNO(ENOBUFS);
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
if (poll_fds) {
|
|
ix = 0;
|
|
fd = nfds;
|
|
while (fd--) {
|
|
poll_fds[ix].events = 0;
|
|
if (fds_read && (0 != FD_ISSET(fd, fds_read)))
|
|
poll_fds[ix].events |= (POLLRDNORM|POLLIN);
|
|
if (fds_write && (0 != FD_ISSET(fd, fds_write)))
|
|
poll_fds[ix].events |= (POLLWRNORM|POLLOUT);
|
|
if (fds_excep && (0 != FD_ISSET(fd, fds_excep)))
|
|
poll_fds[ix].events |= (POLLRDBAND|POLLPRI);
|
|
if (poll_fds[ix].events) {
|
|
poll_fds[ix].fd = fd;
|
|
poll_fds[ix].revents = 0;
|
|
ix++;
|
|
}
|
|
}
|
|
}
|
|
|
|
do {
|
|
if (timeout_ms < 0)
|
|
pending_ms = -1;
|
|
r = poll(poll_fds, poll_nfds, pending_ms);
|
|
} while ((r == -1) && (error = SOCKERRNO) &&
|
|
(error != EINVAL) && error_not_EINTR &&
|
|
((timeout_ms < 0) || ((pending_ms = timeout_ms - elapsed_ms) > 0)));
|
|
|
|
if (r < 0)
|
|
ret = -1;
|
|
|
|
if (r > 0) {
|
|
ix = poll_nfds;
|
|
while (ix--) {
|
|
if (poll_fds[ix].revents & POLLNVAL) {
|
|
SET_SOCKERRNO(EBADF);
|
|
ret = -1;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!ret) {
|
|
ix = poll_nfds;
|
|
while (ix--) {
|
|
if (fds_read && (0 != FD_ISSET(poll_fds[ix].fd, fds_read))) {
|
|
if (0 == (poll_fds[ix].revents & (POLLRDNORM|POLLERR|POLLHUP|POLLIN)))
|
|
FD_CLR(poll_fds[ix].fd, fds_read);
|
|
else
|
|
ret++;
|
|
}
|
|
if (fds_write && (0 != FD_ISSET(poll_fds[ix].fd, fds_write))) {
|
|
if (0 == (poll_fds[ix].revents & (POLLWRNORM|POLLERR|POLLHUP|POLLOUT)))
|
|
FD_CLR(poll_fds[ix].fd, fds_write);
|
|
else
|
|
ret++;
|
|
}
|
|
if (fds_excep && (0 != FD_ISSET(poll_fds[ix].fd, fds_excep))) {
|
|
if (0 == (poll_fds[ix].revents & (POLLRDBAND|POLLERR|POLLHUP|POLLPRI)))
|
|
FD_CLR(poll_fds[ix].fd, fds_excep);
|
|
else
|
|
ret++;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (poll_fds && (poll_nfds > SMALL_POLLNFDS))
|
|
free(poll_fds);
|
|
|
|
#else /* HAVE_POLL_FINE */
|
|
|
|
VERIFY_NFDS(nfds);
|
|
|
|
ptimeout = (timeout_ms < 0) ? NULL : &pending_tv;
|
|
|
|
do {
|
|
if (ptimeout) {
|
|
pending_tv.tv_sec = pending_ms / 1000;
|
|
pending_tv.tv_usec = (pending_ms % 1000) * 1000;
|
|
}
|
|
r = select(nfds, fds_read, fds_write, fds_excep, ptimeout);
|
|
} while ((r == -1) && (error = SOCKERRNO) &&
|
|
(error != EINVAL) && (error != EBADF) && error_not_EINTR &&
|
|
((timeout_ms < 0) || ((pending_ms = timeout_ms - elapsed_ms) > 0)));
|
|
|
|
if (r < 0)
|
|
ret = -1;
|
|
else
|
|
ret = r;
|
|
|
|
#endif /* HAVE_POLL_FINE */
|
|
|
|
return ret;
|
|
}
|
|
|
|
#ifdef TPF
|
|
/*
|
|
* This is a replacement for select() on the TPF platform.
|
|
* It is used whenever libcurl calls select().
|
|
* The call below to tpf_process_signals() is required because
|
|
* TPF's select calls are not signal interruptible.
|
|
*
|
|
* Return values are the same as select's.
|
|
*/
|
|
int tpf_select_libcurl(int maxfds, fd_set* reads, fd_set* writes,
|
|
fd_set* excepts, struct timeval* tv)
|
|
{
|
|
int rc;
|
|
|
|
rc = tpf_select_bsd(maxfds, reads, writes, excepts, tv);
|
|
tpf_process_signals();
|
|
return(rc);
|
|
}
|
|
#endif /* TPF */
|