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| .TH CURLOPT_NOSIGNAL 3 "November 04, 2020" "libcurl 7.78.0" "curl_easy_setopt options" |
| |
| .SH NAME |
| CURLOPT_NOSIGNAL \- skip all signal handling |
| .SH SYNOPSIS |
| #include <curl/curl.h> |
| |
| CURLcode curl_easy_setopt(CURL *handle, CURLOPT_NOSIGNAL, long onoff); |
| .SH DESCRIPTION |
| If \fIonoff\fP 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 \fICURLOPT_NOSIGNAL(3)\fP 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 SIGPIPEs 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 |
| \fICURLAUTH_NTLM_WB\fP authentication could cause a SIGCHLD signal to be |
| raised. |
| .SH DEFAULT |
| 0 |
| .SH AVAILABILITY |
| Added in 7.10 |
| .SH RETURN VALUE |
| Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not. |
