5a488251f7
- make DEFAULT sections less repetitive - make historic mentions use HISTORY - generate the protocols section on `# %PROTOCOLS%` instead of guessing where to put it - generate the availability section on `# %AVAILABILITY%` instead of guessing where to put it - make the protocols section more verbose Closes #14227
70 lines
1.6 KiB
Markdown
70 lines
1.6 KiB
Markdown
---
|
|
c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
|
|
SPDX-License-Identifier: curl
|
|
Title: CURLINFO_OS_ERRNO
|
|
Section: 3
|
|
Source: libcurl
|
|
See-also:
|
|
- curl_easy_getinfo (3)
|
|
- curl_easy_setopt (3)
|
|
Protocol:
|
|
- All
|
|
Added-in: 7.12.2
|
|
---
|
|
|
|
# NAME
|
|
|
|
CURLINFO_OS_ERRNO - get errno number from last connect failure
|
|
|
|
# SYNOPSIS
|
|
|
|
~~~c
|
|
#include <curl/curl.h>
|
|
|
|
CURLcode curl_easy_getinfo(CURL *handle, CURLINFO_OS_ERRNO, long *errnop);
|
|
~~~
|
|
|
|
# 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's 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.
|
|
|
|
# %PROTOCOLS%
|
|
|
|
# EXAMPLE
|
|
|
|
~~~c
|
|
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);
|
|
}
|
|
}
|
|
~~~
|
|
|
|
# %AVAILABILITY%
|
|
|
|
# RETURN VALUE
|
|
|
|
Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
|