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- .\" generated by cd2nroff 0.1 from CURLINFO_OS_ERRNO.md
- .TH CURLINFO_OS_ERRNO 3 "2025-01-17" 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)
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