x SuSE Linux 13.1-RELEASE x
x SuSE Linux 13.1-RELEASEx
CURLOPT_NOSIGNAL(3) libcurl 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, con-
trary to our desire. In addition, using CURLAUTH_NTLM_WB authentication
could cause a SIGCHLD signal to be raised.
DEFAULT
0
PROTOCOLS
All
EXAMPLE
CURL *curl = curl_easy_init();
if(curl) {
curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
curl_easy_setopt(curl, CURLOPT_NOSIGNAL, 1L);
ret = curl_easy_perform(curl);
curl_easy_cleanup(curl);
}
AVAILABILITY
Added in 7.10
RETURN VALUE
Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION
if not.
SEE ALSO
CURLOPT_TIMEOUT(3),
ibcurl 8.4.0 August 22, 2023 CURLOPT_NOSIGNAL(3)
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