Tribblix: manual page: CURLOPT

CURLOPT_NOSIGNAL(3) Introduction to Library Functions 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

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).