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a55256cfb2
The read callback can timeout if there's nothing to read within the given maximum period. Example use case is when doing "curl -m 3 telnet://example.com" or anything else that expects input on stdin or similar that otherwise would "hang" until something happens and then not respect the timeout. This fixes KNOWN_BUG 8.1, first filed in July 2009. Bug: https://sourceforge.net/p/curl/bugs/846/ Closes #9815
117 lines
3.2 KiB
C
117 lines
3.2 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 - 2022, 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 https://curl.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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* SPDX-License-Identifier: curl
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*
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***************************************************************************/
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#include "tool_setup.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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#define ENABLE_CURLX_PRINTF
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/* use our own printf() functions */
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#include "curlx.h"
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#include "tool_cfgable.h"
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#include "tool_cb_rea.h"
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#include "tool_operate.h"
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#include "tool_util.h"
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#include "memdebug.h" /* keep this as LAST include */
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/*
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** callback for CURLOPT_READFUNCTION
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*/
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size_t tool_read_cb(char *buffer, size_t sz, size_t nmemb, void *userdata)
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{
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ssize_t rc = 0;
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struct InStruct *in = userdata;
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struct OperationConfig *config = in->config;
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if(config->timeout_ms) {
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struct timeval now = tvnow();
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long msdelta = tvdiff(now, in->per->start);
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if(msdelta > config->timeout_ms)
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/* timeout */
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return 0;
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#ifndef WIN32
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/* this logic waits on read activity on a file descriptor that is not a
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socket which makes it not work with select() on Windows */
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else {
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fd_set bits;
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struct timeval timeout;
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long wait = config->timeout_ms - msdelta;
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/* wait this long at the most */
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timeout.tv_sec = wait/1000;
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timeout.tv_usec = (wait%1000)*1000;
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FD_ZERO(&bits);
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FD_SET(in->fd, &bits);
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if(!select(in->fd + 1, &bits, NULL, NULL, &timeout))
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return 0; /* timeout */
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}
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#endif
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}
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rc = read(in->fd, buffer, sz*nmemb);
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if(rc < 0) {
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if(errno == EAGAIN) {
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errno = 0;
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in->config->readbusy = TRUE;
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return CURL_READFUNC_PAUSE;
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}
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/* since size_t is unsigned we can't return negative values fine */
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rc = 0;
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}
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in->config->readbusy = FALSE;
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/* when select() rerturned zero here, it timed out */
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return (size_t)rc;
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}
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/*
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** callback for CURLOPT_XFERINFOFUNCTION used to unpause busy reads
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*/
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int tool_readbusy_cb(void *clientp,
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curl_off_t dltotal, curl_off_t dlnow,
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curl_off_t ultotal, curl_off_t ulnow)
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{
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struct per_transfer *per = clientp;
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struct OperationConfig *config = per->config;
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(void)dltotal; /* unused */
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(void)dlnow; /* unused */
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(void)ultotal; /* unused */
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(void)ulnow; /* unused */
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if(config->readbusy) {
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config->readbusy = FALSE;
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curl_easy_pause(per->curl, CURLPAUSE_CONT);
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}
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return per->noprogress? 0 : CURL_PROGRESSFUNC_CONTINUE;
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}
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