94 lines
3.4 KiB
Groff
94 lines
3.4 KiB
Groff
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.\" **************************************************************************
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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) 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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.TH curl_multi_timeout 3 "2 Jan 2006" "libcurl" "libcurl"
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.SH NAME
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curl_multi_timeout \- how long to wait for action before proceeding
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.SH SYNOPSIS
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.nf
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#include <curl/curl.h>
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CURLMcode curl_multi_timeout(CURLM *multi_handle, long *timeout);
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.fi
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.SH DESCRIPTION
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An application using the libcurl multi interface should call
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\fIcurl_multi_timeout(3)\fP to figure out how long it should wait for socket
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actions \- at most \- before proceeding.
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Proceeding means either doing the socket-style timeout action: call the
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\fIcurl_multi_socket_action(3)\fP function with the \fBsockfd\fP argument set
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to CURL_SOCKET_TIMEOUT, or call \fIcurl_multi_perform(3)\fP if you are using
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the simpler and older multi interface approach.
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The timeout value returned in the long \fBtimeout\fP points to, is in number
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of milliseconds at this moment. If 0, it means you should proceed immediately
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without waiting for anything. If it returns -1, there is no timeout at all set.
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An application that uses the multi_socket API SHOULD NOT use this function,
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but SHOULD instead use the \fICURLMOPT_TIMERFUNCTION(3)\fP option for proper
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and desired behavior.
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Note: if libcurl returns a -1 timeout here, it just means that libcurl
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currently has no stored timeout value. You must not wait too long (more than a
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few seconds perhaps) before you call \fIcurl_multi_perform(3)\fP again.
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.SH EXAMPLE
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.nf
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int main(void)
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{
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struct timeval timeout;
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long timeo;
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fd_set fdread;
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fd_set fdwrite;
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fd_set fdexcep;
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int maxfd;
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CURLM *multi = curl_multi_init();
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curl_multi_timeout(multi, &timeo);
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if(timeo < 0)
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/* no set timeout, use a default */
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timeo = 980;
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timeout.tv_sec = timeo / 1000;
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timeout.tv_usec = (timeo % 1000) * 1000;
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/* wait for activities no longer than the set timeout */
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select(maxfd + 1, &fdread, &fdwrite, &fdexcep, &timeout);
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}
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.fi
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.SH TYPICAL USAGE
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Call \fIcurl_multi_timeout(3)\fP, then wait for action on the sockets. Figure
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out which sockets to wait for by calling \fIcurl_multi_fdset(3)\fP.
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When there is activity or timeout, call \fIcurl_multi_perform(3)\fP and then
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loop - until all transfers are complete.
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.SH AVAILABILITY
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This function was added in libcurl 7.15.4.
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.SH RETURN VALUE
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The standard CURLMcode for multi interface error codes.
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.SH "SEE ALSO"
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.BR curl_multi_fdset (3),
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.BR curl_multi_info_read (3),
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.BR curl_multi_setopt (3),
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.BR curl_multi_socket (3)
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