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316 lines
7.7 KiB
316 lines
7.7 KiB
/***************************************************************************
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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: select.c,v 1.3 2008-09-15 22:23:37 hoffman Exp $
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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_TYPES_H
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#include <sys/types.h>
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#endif
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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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#ifndef HAVE_SELECT
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#error "We can't compile without select() support!"
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#endif
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#if defined(__BEOS__) && !defined(__HAIKU__)
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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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#if defined(USE_WINSOCK) || defined(TPF)
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#define VERIFY_SOCK(x) /* sockets are not in range [0..FD_SETSIZE] */
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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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errno = 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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/*
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* This is an internal function used for waiting for read or write
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* events on single file descriptors. It attempts to replace select()
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* in order to avoid limits with FD_SETSIZE.
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*
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* Return values:
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* -1 = system call error
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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_select(curl_socket_t readfd, curl_socket_t writefd, int timeout_ms)
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{
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#if defined(HAVE_POLL_FINE) || defined(CURL_HAVE_WSAPOLL)
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struct pollfd pfd[2];
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int num;
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int r;
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int ret;
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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 = POLLIN;
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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 = POLLOUT;
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num++;
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}
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#ifdef HAVE_POLL_FINE
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do {
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r = poll(pfd, num, timeout_ms);
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} while((r == -1) && (errno == EINTR));
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#else
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r = WSAPoll(pfd, num, timeout_ms);
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#endif
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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 & (POLLIN|POLLHUP))
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ret |= CSELECT_IN;
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if (pfd[num].revents & POLLERR) {
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#ifdef __CYGWIN__
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/* Cygwin 1.5.21 needs this hack to pass test 160 */
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if (errno == EINPROGRESS)
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ret |= CSELECT_IN;
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else
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#endif
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ret |= CSELECT_ERR;
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}
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num++;
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}
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if (writefd != CURL_SOCKET_BAD) {
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if (pfd[num].revents & POLLOUT)
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ret |= CSELECT_OUT;
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if (pfd[num].revents & (POLLERR|POLLHUP))
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ret |= CSELECT_ERR;
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}
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return ret;
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#else
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struct timeval timeout;
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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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int r;
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int ret;
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timeout.tv_sec = timeout_ms / 1000;
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timeout.tv_usec = (timeout_ms % 1000) * 1000;
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if((readfd == CURL_SOCKET_BAD) && (writefd == CURL_SOCKET_BAD)) {
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/* According to POSIX we should pass in NULL pointers if we don't want to
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wait for anything in particular but just use the timeout function.
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Windows however returns immediately if done so. I copied the MSDOS
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delay() use from src/main.c that already had this work-around. */
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#ifdef WIN32
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Sleep(timeout_ms);
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#elif defined(__MSDOS__)
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delay(timeout_ms);
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#else
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select(0, NULL, NULL, NULL, &timeout);
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#endif
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return 0;
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}
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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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do {
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r = select((int)maxfd + 1, &fds_read, &fds_write, &fds_err, &timeout);
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} while((r == -1) && (Curl_sockerrno() == EINTR));
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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
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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 too large for FD_SETSIZE.
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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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* 1 = 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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int r;
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#ifdef HAVE_POLL_FINE
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do {
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r = poll(ufds, nfds, timeout_ms);
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} while((r == -1) && (errno == EINTR));
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#elif defined(CURL_HAVE_WSAPOLL)
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r = WSAPoll(ufds, nfds, timeout_ms);
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#else
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struct timeval timeout;
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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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unsigned int i;
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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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if (ufds[i].fd == CURL_SOCKET_BAD)
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continue;
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#ifndef USE_WINSOCK /* winsock sockets are not in range [0..FD_SETSIZE] */
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if (ufds[i].fd >= FD_SETSIZE) {
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errno = EINVAL;
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return -1;
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}
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#endif
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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 & POLLIN)
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FD_SET(ufds[i].fd, &fds_read);
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if (ufds[i].events & POLLOUT)
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FD_SET(ufds[i].fd, &fds_write);
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if (ufds[i].events & POLLERR)
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FD_SET(ufds[i].fd, &fds_err);
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}
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if (timeout_ms < 0) {
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ptimeout = NULL; /* wait forever */
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} else {
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timeout.tv_sec = timeout_ms / 1000;
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timeout.tv_usec = (timeout_ms % 1000) * 1000;
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ptimeout = &timeout;
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}
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do {
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r = select((int)maxfd + 1, &fds_read, &fds_write, &fds_err, ptimeout);
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} while((r == -1) && (Curl_sockerrno() == EINTR));
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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 |= POLLERR;
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if (ufds[i].revents != 0)
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r++;
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}
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#endif
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return r;
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}
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#ifdef TPF
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/*
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* This is a replacement for select() on the TPF platform.
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* It is used whenever libcurl calls select().
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* The call below to tpf_process_signals() is required because
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* TPF's select calls are not signal interruptible.
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*
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* Return values are the same as select's.
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*/
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int tpf_select_libcurl(int maxfds, fd_set* reads, fd_set* writes,
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fd_set* excepts, struct timeval* tv)
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{
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int rc;
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rc = tpf_select_bsd(maxfds, reads, writes, excepts, tv);
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tpf_process_signals();
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return(rc);
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}
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#endif /* TPF */
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