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 the libcurl  may  store  human  readable
       error  messages  in  on  failures or problems. This may be more helpful
       than just the return code from curl_easy_perform(3) and  related  func-
       tions. 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 curl_easy_cleanup(3) or
       you set the same option again to use a different pointer.

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

       If  the  library does not return an error, the buffer may not have been
       touched. Do not rely on the contents in those cases.

DEFAULT
       NULL

PROTOCOLS
       All

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

         curl_easy_setopt(curl, CURLOPT_URL, "http://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 7.54.0                 February 03, 2016        CURLOPT_ERRORBUFFER(3)