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90 lines
3.5 KiB
Groff
90 lines
3.5 KiB
Groff
.\" **************************************************************************
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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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.\"
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.TH CURLOPT_TIMEOUT 3 "17 Jun 2014" libcurl libcurl
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.SH NAME
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CURLOPT_TIMEOUT \- maximum time the transfer is allowed to complete
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.SH SYNOPSIS
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.nf
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#include <curl/curl.h>
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CURLcode curl_easy_setopt(CURL *handle, CURLOPT_TIMEOUT, long timeout);
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.fi
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.SH DESCRIPTION
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Pass a long as parameter containing \fItimeout\fP - the maximum time in
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seconds that you allow the entire transfer operation to take. The whole thing,
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from start to end. Normally, name lookups can take a considerable time and
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limiting operations risk aborting perfectly normal operations.
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\fICURLOPT_TIMEOUT_MS(3)\fP is the same function but set in milliseconds.
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If both \fICURLOPT_TIMEOUT(3)\fP and \fICURLOPT_TIMEOUT_MS(3)\fP are set, the
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value set last is used.
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Since this option puts a hard limit on how long time a request is allowed to
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take, it has limited use in dynamic use cases with varying transfer
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times. That is especially apparent when using the multi interface, which may
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queue the transfer, and that time is included. You are advised to explore
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\fICURLOPT_LOW_SPEED_LIMIT(3)\fP, \fICURLOPT_LOW_SPEED_TIME(3)\fP or using
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\fICURLOPT_PROGRESSFUNCTION(3)\fP to implement your own timeout logic.
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The connection timeout set with \fICURLOPT_CONNECTTIMEOUT(3)\fP is included in
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this general all-covering timeout.
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With \fICURLOPT_CONNECTTIMEOUT(3)\fP set to 3 and \fICURLOPT_TIMEOUT(3)\fP set
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to 5, the operation can never last longer than 5 seconds.
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With \fICURLOPT_CONNECTTIMEOUT(3)\fP set to 4 and \fICURLOPT_TIMEOUT(3)\fP set
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to 2, the operation can never last longer than 2 seconds.
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This option may cause libcurl to use the SIGALRM signal to timeout system
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calls on builds not using asynch DNS. In unix-like systems, this might cause
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signals to be used unless \fICURLOPT_NOSIGNAL(3)\fP is set.
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.SH DEFAULT
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Default timeout is 0 (zero) which means it never times out during transfer.
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.SH PROTOCOLS
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All
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.SH EXAMPLE
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.nf
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CURL *curl = curl_easy_init();
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if(curl) {
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curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
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/* complete within 20 seconds */
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curl_easy_setopt(curl, CURLOPT_TIMEOUT, 20L);
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curl_easy_perform(curl);
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}
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.fi
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.SH AVAILABILITY
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Always
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.SH RETURN VALUE
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Returns CURLE_OK. Returns CURLE_BAD_FUNCTION_ARGUMENT if set to a negative
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value or a value that when converted to milliseconds is too large.
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.SH "SEE ALSO"
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.BR CURLOPT_CONNECTTIMEOUT (3),
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.BR CURLOPT_LOW_SPEED_LIMIT (3),
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.BR CURLOPT_TCP_KEEPALIVE (3),
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.BR CURLOPT_TIMEOUT_MS (3)
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