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eefcc1bda4
curldown is this new file format for libcurl man pages. It is markdown inspired with differences: - Each file has a set of leading headers with meta-data - Supports a small subset of markdown - Uses .md file extensions for editors/IDE/GitHub to treat them nicely - Generates man pages very similar to the previous ones - Generates man pages that still convert nicely to HTML on the website - Detects and highlights mentions of curl symbols automatically (when their man page section is specified) tools: - cd2nroff: converts from curldown to nroff man page - nroff2cd: convert an (old) nroff man page to curldown - cdall: convert many nroff pages to curldown versions - cd2cd: verifies and updates a curldown to latest curldown This setup generates .3 versions of all the curldown versions at build time. CI: Since the documentation is now technically markdown in the eyes of many things, the CI runs many more tests and checks on this documentation, including proselint, link checkers and tests that make sure we capitalize the first letter after a period... Closes #12730
102 lines
2.5 KiB
Markdown
102 lines
2.5 KiB
Markdown
---
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c: Copyright (C) Daniel Stenberg, <daniel.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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