NAME

       CURLOPT_ERRORBUFFER - error buffer for error messages

SYNOPSIS

       #include <curl/curl.h>

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

DESCRIPTION

       Pass  a  char  pointer  to  a  buffer  that  libcurl may use to store human readable error
       messages on failures or problems. This may be more helpful than just the return code  from
       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  might  cause  odd  behavior  or even crashes. libcurl might need it until you call
       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  initializes 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 was untouched.

       Consider  CURLOPT_VERBOSE(3)  and  CURLOPT_DEBUGFUNCTION(3)  to better debug and trace why
       errors happen.

       Using this option multiple times makes the last set pointer override  the  previous  ones.
       Set it to NULL to disable its use again.

DEFAULT

       NULL

PROTOCOLS

       This functionality affects all supported protocols

EXAMPLE

       #include <string.h> /* for strlen() */
       int main(void)
       {
         CURL *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

       Added in curl 7.1

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), curl_url_strerror(3)