CURLOPT_NOSIGNAL(3) Library Functions Manual CURLOPT_NOSIGNAL(3)
NAME
CURLOPT_NOSIGNAL - skip all signal handling
SYNOPSIS
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_NOSIGNAL, long onoff);
DESCRIPTION
If onoff is 1, libcurl uses no functions that install signal handlers
or any functions that cause signals to be sent to the process. This
option is here to allow multi-threaded Unix applications to still
set/use all timeout options etc, without risking getting signals.
If this option is set and libcurl has been built with the standard name
resolver, timeouts cannot occur while the name resolve takes place.
Consider building libcurl with the c-ares or threaded resolver backends
to enable asynchronous DNS lookups, to enable timeouts for name
resolves without the use of signals.
Setting CURLOPT_NOSIGNAL(3) to 1 makes libcurl NOT ask the system to
ignore SIGPIPE signals, which otherwise are sent by the system when
trying to send data to a socket which is closed in the other end.
libcurl makes an effort to never cause such SIGPIPE signals to trigger,
but some operating systems have no way to avoid them and even on those
that have there are some corner cases when they may still happen,
contrary to our desire.
DEFAULT
0
PROTOCOLS
This functionality affects all supported protocols
EXAMPLE
int main(void)
{
CURL *curl = curl_easy_init();
if(curl) {
CURLcode res;
curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
curl_easy_setopt(curl, CURLOPT_NOSIGNAL, 1L);
res = curl_easy_perform(curl);
curl_easy_cleanup(curl);
}
}
AVAILABILITY
Added in curl 7.10
RETURN VALUE
curl_easy_setopt(3) returns a CURLcode indicating success or error.
CURLE_OK (0) means everything was OK, non-zero means an error occurred,
see libcurl-errors(3).
SEE ALSO
CURLOPT_TIMEOUT(3)
libcurl 2025-02-08 CURLOPT_NOSIGNAL(3)
curl 8.12.0 - Generated Sun Feb 16 16:15:56 CST 2025