79 lines
1.9 KiB
Markdown
79 lines
1.9 KiB
Markdown
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---
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c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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SPDX-License-Identifier: curl
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Title: CURLOPT_NOSIGNAL
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Section: 3
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Source: libcurl
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See-also:
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- CURLOPT_TIMEOUT (3)
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---
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# NAME
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CURLOPT_NOSIGNAL - skip all signal handling
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# SYNOPSIS
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~~~c
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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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~~~
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# DESCRIPTION
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If *onoff* 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 CURLOPT_NOSIGNAL(3) 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 *CURLAUTH_NTLM_WB* authentication could cause a SIGCHLD signal to be
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raised.
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# DEFAULT
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0
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# PROTOCOLS
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All
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# EXAMPLE
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~~~c
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int main(void)
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{
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CURL *curl = curl_easy_init();
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if(curl) {
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CURLcode res;
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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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res = curl_easy_perform(curl);
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curl_easy_cleanup(curl);
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}
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}
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~~~
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# AVAILABILITY
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Added in 7.10
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# RETURN VALUE
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Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
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