CURLOPT_ERRORBUFFER(3) curl_easy_setopt options CURLOPT_ERRORBUFFER(3)
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 * 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 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 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.
Do not rely on the contents of the buffer unless an error code was re-
turned. 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 CURLOPT_VERBOSE(3) and CURLOPT_DEBUGFUNCTION(3) to better de-
bug 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), curl_url_strerror(3)
libcurl 7.81.0 November 26, 2021 CURLOPT_ERRORBUFFER(3)
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