.\" generated by cd2nroff 0.1 from CURLINFO_OS_ERRNO.md
.TH CURLINFO_OS_ERRNO 3 "2024-11-18" libcurl
.SH NAME
CURLINFO_OS_ERRNO \- get errno number from last connect failure
.SH SYNOPSIS
.nf
#include <curl/curl.h>

CURLcode curl_easy_getinfo(CURL *handle, CURLINFO_OS_ERRNO, long *errnop);
.fi
.SH DESCRIPTION
Pass a pointer to a long to receive the errno variable from a connect failure.
Note that the value is only set on failure, it is not reset upon a successful
operation. The number is OS and system specific.

libcurl network\-related errors that may have a saved errno are:
CURLE_COULDNT_CONNECT, CURLE_FAILED_INIT, CURLE_INTERFACE_FAILED,
CURLE_OPERATION_TIMEDOUT, CURLE_RECV_ERROR, CURLE_SEND_ERROR.

Since 8.8.0 libcurl clears the easy handle\(aqs saved errno before performing the
transfer. Prior versions did not clear the saved errno, which means if a saved
errno is retrieved it could be from a previous transfer on the same handle.
.SH PROTOCOLS
This functionality affects all supported protocols
.SH EXAMPLE
.nf
int main(void)
{
  CURL *curl = curl_easy_init();
  if(curl) {
    CURLcode res;
    curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
    res = curl_easy_perform(curl);
    if(res != CURLE_OK) {
      long error;
      res = curl_easy_getinfo(curl, CURLINFO_OS_ERRNO, &error);
      if(!res && error) {
        printf("Errno: %ld\\n", error);
      }
    }
    curl_easy_cleanup(curl);
  }
}
.fi
.SH AVAILABILITY
Added in curl 7.12.2
.SH RETURN VALUE
Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
.SH SEE ALSO
.BR curl_easy_getinfo (3),
.BR curl_easy_setopt (3)