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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 will not use any 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 will not 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. 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 8.1.2                    April 26, 2023             CURLOPT_NOSIGNAL(3)

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