eefcc1bda4
curldown is this new file format for libcurl man pages. It is markdown inspired with differences: - Each file has a set of leading headers with meta-data - Supports a small subset of markdown - Uses .md file extensions for editors/IDE/GitHub to treat them nicely - Generates man pages very similar to the previous ones - Generates man pages that still convert nicely to HTML on the website - Detects and highlights mentions of curl symbols automatically (when their man page section is specified) tools: - cd2nroff: converts from curldown to nroff man page - nroff2cd: convert an (old) nroff man page to curldown - cdall: convert many nroff pages to curldown versions - cd2cd: verifies and updates a curldown to latest curldown This setup generates .3 versions of all the curldown versions at build time. CI: Since the documentation is now technically markdown in the eyes of many things, the CI runs many more tests and checks on this documentation, including proselint, link checkers and tests that make sure we capitalize the first letter after a period... Closes #12730
79 lines
1.9 KiB
Markdown
79 lines
1.9 KiB
Markdown
---
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c: Copyright (C) Daniel Stenberg, <daniel.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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