102 lines
2.5 KiB
Markdown
102 lines
2.5 KiB
Markdown
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---
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c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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SPDX-License-Identifier: curl
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Title: CURLOPT_ERRORBUFFER
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Section: 3
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Source: libcurl
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See-also:
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- CURLOPT_DEBUGFUNCTION (3)
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- CURLOPT_VERBOSE (3)
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- curl_easy_strerror (3)
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- curl_multi_strerror (3)
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- curl_share_strerror (3)
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- curl_url_strerror (3)
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---
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# NAME
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CURLOPT_ERRORBUFFER - error buffer for error messages
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# SYNOPSIS
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~~~c
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#include <curl/curl.h>
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CURLcode curl_easy_setopt(CURL *handle, CURLOPT_ERRORBUFFER, char *buf);
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~~~
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# DESCRIPTION
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Pass a char pointer to a buffer that libcurl may use to store human readable
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error messages on failures or problems. This may be more helpful than just the
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return code from curl_easy_perform(3) and related functions. The buffer must
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be at least **CURL_ERROR_SIZE** bytes big.
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You must keep the associated buffer available until libcurl no longer needs
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it. Failing to do so might cause odd behavior or even crashes. libcurl might
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need it until you call curl_easy_cleanup(3) or you set the same option
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again to use a different pointer.
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Do not rely on the contents of the buffer unless an error code was returned.
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Since 7.60.0 libcurl initializes the contents of the error buffer to an empty
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string before performing the transfer. For earlier versions if an error code
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was returned but there was no error detail then the buffer was untouched.
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Consider CURLOPT_VERBOSE(3) and CURLOPT_DEBUGFUNCTION(3) to better
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debug and trace why errors happen.
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# DEFAULT
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NULL
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# PROTOCOLS
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All
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# EXAMPLE
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~~~c
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#include <string.h> /* for strlen() */
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int main(void)
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{
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CURL *curl = curl_easy_init();
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if(curl) {
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CURLcode res;
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char errbuf[CURL_ERROR_SIZE];
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curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
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/* provide a buffer to store errors in */
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curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, errbuf);
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/* set the error buffer as empty before performing a request */
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errbuf[0] = 0;
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/* perform the request */
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res = curl_easy_perform(curl);
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/* if the request did not complete correctly, show the error
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information. if no detailed error information was written to errbuf
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show the more generic information from curl_easy_strerror instead.
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*/
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if(res != CURLE_OK) {
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size_t len = strlen(errbuf);
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fprintf(stderr, "\nlibcurl: (%d) ", res);
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if(len)
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fprintf(stderr, "%s%s", errbuf,
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((errbuf[len - 1] != '\n') ? "\n" : ""));
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else
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fprintf(stderr, "%s\n", curl_easy_strerror(res));
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}
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}
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}
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~~~
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# AVAILABILITY
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Always
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# RETURN VALUE
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Returns CURLE_OK
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