78 lines
2.9 KiB
Groff
78 lines
2.9 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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.\"
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.TH CURLOPT_NOSIGNAL 3 "August 22, 2023" "ibcurl 8.3.0" libcurl
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.SH NAME
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CURLOPT_NOSIGNAL \- skip all signal handling
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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_NOSIGNAL, long onoff);
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.fi
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.SH DESCRIPTION
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If \fIonoff\fP is 1, libcurl uses no functions that install signal handlers or
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any functions that cause signals to be sent to the process. This option is
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here to allow multi-threaded unix applications to still set/use all timeout
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options etc, without risking getting signals.
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If this option is set and libcurl has been built with the standard name
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resolver, timeouts cannot occur while the name resolve takes place. Consider
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building libcurl with the c-ares or threaded resolver backends to enable
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asynchronous DNS lookups, to enable timeouts for name resolves without the use
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of signals.
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Setting \fICURLOPT_NOSIGNAL(3)\fP to 1 makes libcurl NOT ask the system to
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ignore SIGPIPE signals, which otherwise are sent by the system when trying to
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send data to a socket which is closed in the other end. libcurl makes an
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effort to never cause such SIGPIPE signals to trigger, but some operating
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systems have no way to avoid them and even on those that have there are some
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corner cases when they may still happen, contrary to our desire. In addition,
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using \fICURLAUTH_NTLM_WB\fP authentication could cause a SIGCHLD signal to be
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raised.
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.SH DEFAULT
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0
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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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curl_easy_setopt(curl, CURLOPT_NOSIGNAL, 1L);
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ret = curl_easy_perform(curl);
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curl_easy_cleanup(curl);
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}
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.fi
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.SH AVAILABILITY
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Added in 7.10
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.SH RETURN VALUE
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Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
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.SH SEE ALSO
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.BR CURLOPT_TIMEOUT "(3), "
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