Provided by: libcurl4-doc_7.55.1-1ubuntu2_all bug

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  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
       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)