CURLOPT_ERRORBUFFER(3)     curl_easy_setopt options     CURLOPT_ERRORBUFFER(3)

NAME
       CURLOPT_ERRORBUFFER - set error buffer for error messages

SYNOPSIS
       #include <curl/curl.h>

       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_ERRORBUFFER, char
       *buf);

DESCRIPTION
       Pass a char * to a buffer that libcurl may store human readable error
       messages on failures or problems. This may be more helpful than just
       the return code from _easy_perform&section=3">curl_easy_perform(3) and related functions. The
       buffer must be at least CURL_ERROR_SIZE bytes big.

       You must keep the associated buffer available until libcurl no longer
       needs it. Failing to do so will cause very odd behavior or even
       crashes. libcurl will need it until you call _easy_cleanup&section=3">curl_easy_cleanup(3) or
       you set the same option again to use a different pointer.

       Do not rely on the contents of the buffer unless an error code was
       returned.  Since 7.60.0 libcurl will initialize the contents of the
       error buffer to an empty string before performing the transfer. For
       earlier versions if an error code was returned but there was no error
       detail then the buffer is untouched.

       Consider _VERBOSE&section=3">CURLOPT_VERBOSE(3) and _DEBUGFUNCTION&section=3">CURLOPT_DEBUGFUNCTION(3) to better
       debug and trace why errors happen.

DEFAULT
       NULL

PROTOCOLS
       All

EXAMPLE
       curl = curl_easy_init();
       if(curl) {
         CURLcode res;
         char errbuf[CURL_ERROR_SIZE];

         curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");

         /* provide a buffer to store errors in */
         curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, errbuf);

         /* set the error buffer as empty before performing a request */
         errbuf[0] = 0;

         /* perform the request */
         res = curl_easy_perform(curl);

         /* if the request did not complete correctly, show the error
         information. if no detailed error information was written to errbuf
         show the more generic information from curl_easy_strerror instead.
         */
         if(res != CURLE_OK) {
           size_t len = strlen(errbuf);
           fprintf(stderr, "\nlibcurl: (%d) ", res);
           if(len)
             fprintf(stderr, "%s%s", errbuf,
                     ((errbuf[len - 1] != '\n') ? "\n" : ""));
           else
             fprintf(stderr, "%s\n", curl_easy_strerror(res));
         }
       }

AVAILABILITY
       Always

RETURN VALUE
       Returns CURLE_OK

SEE ALSO
       CURLOPT_DEBUGFUNCTION(3), CURLOPT_VERBOSE(3),  curl_easy_strerror(3),
       curl_multi_strerror(3),  curl_share_strerror(3)

libcurl 7.77.0                 November 4, 2020         CURLOPT_ERRORBUFFER(3)