annotate mupdf-source/thirdparty/curl/docs/libcurl/opts/CURLOPT_ERRORBUFFER.3 @ 17:dd9cdb856310

Remove PKG-INFO from the because it is regenerated automatically for the sdist
author Franz Glasner <fzglas.hg@dom66.de>
date Thu, 18 Sep 2025 17:40:40 +0200
parents b50eed0cc0ef
children
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1 .\" **************************************************************************
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2 .\" * _ _ ____ _
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3 .\" * Project ___| | | | _ \| |
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4 .\" * / __| | | | |_) | |
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5 .\" * | (__| |_| | _ <| |___
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6 .\" * \___|\___/|_| \_\_____|
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7 .\" *
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8 .\" * Copyright (C) 1998 - 2014, Daniel Stenberg, <daniel@haxx.se>, et al.
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9 .\" *
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10 .\" * This software is licensed as described in the file COPYING, which
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11 .\" * you should have received as part of this distribution. The terms
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12 .\" * are also available at https://curl.haxx.se/docs/copyright.html.
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13 .\" *
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14 .\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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15 .\" * copies of the Software, and permit persons to whom the Software is
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16 .\" * furnished to do so, under the terms of the COPYING file.
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17 .\" *
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18 .\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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19 .\" * KIND, either express or implied.
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20 .\" *
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21 .\" **************************************************************************
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22 .\"
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23 .TH CURLOPT_ERRORBUFFER 3 "17 Jun 2014" "libcurl 7.37.0" "curl_easy_setopt options"
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24 .SH NAME
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25 CURLOPT_ERRORBUFFER \- set error buffer for error messages
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26 .SH SYNOPSIS
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27 #include <curl/curl.h>
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29 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_ERRORBUFFER, char *buf);
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30 .SH DESCRIPTION
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31 Pass a char * to a buffer that libcurl \fBmay\fP store human readable error
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32 messages on failures or problems. This may be more helpful than just the
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33 return code from \fIcurl_easy_perform(3)\fP and related functions. The buffer
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34 \fBmust be at least CURL_ERROR_SIZE bytes big\fP.
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35
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36 You must keep the associated buffer available until libcurl no longer needs
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37 it. Failing to do so will cause very odd behavior or even crashes. libcurl
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38 will need it until you call \fIcurl_easy_cleanup(3)\fP or you set the same
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39 option again to use a different pointer.
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40
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41 Do not rely on the contents of the buffer unless an error code was returned.
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42 Since 7.60.0 libcurl will initialize the contents of the error buffer to an
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43 empty string before performing the transfer. For earlier versions if an error
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44 code was returned but there was no error detail then the buffer is untouched.
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45
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46 Consider \fICURLOPT_VERBOSE(3)\fP and \fICURLOPT_DEBUGFUNCTION(3)\fP to better
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47 debug and trace why errors happen.
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48 .SH DEFAULT
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49 NULL
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50 .SH PROTOCOLS
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51 All
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52 .SH EXAMPLE
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53 .nf
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54 curl = curl_easy_init();
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55 if(curl) {
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56 CURLcode res;
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57 char errbuf[CURL_ERROR_SIZE];
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58
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59 curl_easy_setopt(curl, CURLOPT_URL, "http://example.com");
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60
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61 /* provide a buffer to store errors in */
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62 curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, errbuf);
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63
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64 /* set the error buffer as empty before performing a request */
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65 errbuf[0] = 0;
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66
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67 /* perform the request */
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68 res = curl_easy_perform(curl);
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69
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70 /* if the request did not complete correctly, show the error
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71 information. if no detailed error information was written to errbuf
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72 show the more generic information from curl_easy_strerror instead.
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73 */
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74 if(res != CURLE_OK) {
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75 size_t len = strlen(errbuf);
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76 fprintf(stderr, "\\nlibcurl: (%d) ", res);
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77 if(len)
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78 fprintf(stderr, "%s%s", errbuf,
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79 ((errbuf[len - 1] != '\\n') ? "\\n" : ""));
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80 else
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81 fprintf(stderr, "%s\\n", curl_easy_strerror(res));
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82 }
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83 }
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84 .fi
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85 .SH AVAILABILITY
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86 Always
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87 .SH RETURN VALUE
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88 Returns CURLE_OK
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89 .SH "SEE ALSO"
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90 .BR CURLOPT_DEBUGFUNCTION "(3), " CURLOPT_VERBOSE "(3), "
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91 .BR curl_easy_strerror "(3), " curl_multi_strerror "(3), "
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92 .BR curl_share_strerror "(3) "