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23 .TH CURLOPT_ERRORBUFFER 3 "17 Jun 2014" "libcurl 7.37.0" "curl_easy_setopt options"
25 CURLOPT_ERRORBUFFER \- set error buffer for error messages
27 #include <curl/curl.h>
29 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_ERRORBUFFER, char *buf);
31 Pass a char * to a buffer that the libcurl may store human readable error
32 messages in on failures or problems. This may be more helpful than just the
33 return code from \fIcurl_easy_perform(3)\fP and related functions. The buffer
34 \fBmust be at least CURL_ERROR_SIZE bytes big\fP.
36 You must keep the associated buffer available until libcurl no longer needs
37 it. Failing to do so will cause very odd behavior or even crashes. libcurl
38 will need it until you call \fIcurl_easy_cleanup(3)\fP or you set the same
39 option again to use a different pointer.
41 Consider \fICURLOPT_VERBOSE(3)\fP and \fICURLOPT_DEBUGFUNCTION(3)\fP to better
42 debug and trace why errors happen.
44 If the library does not return an error, the buffer may not have been
45 touched. Do not rely on the contents in those cases.
52 curl = curl_easy_init();
55 char errbuf[CURL_ERROR_SIZE];
57 curl_easy_setopt(curl, CURLOPT_URL, "http://example.com");
59 /* provide a buffer to store errors in */
60 curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, errbuf);
62 /* set the error buffer as empty before performing a request */
65 /* perform the request */
66 res = curl_easy_perform(curl);
68 /* if the request did not complete correctly, show the error
69 information. if no detailed error information was written to errbuf
70 show the more generic information from curl_easy_strerror instead.
73 size_t len = strlen(errbuf);
74 fprintf(stderr, "\\nlibcurl: (%d) ", res);
76 fprintf(stderr, "%s%s", errbuf,
77 ((errbuf[len - 1] != '\\n') ? "\\n" : ""));
79 fprintf(stderr, "%s\\n", curl_easy_strerror(res));
88 .BR CURLOPT_DEBUGFUNCTION "(3), " CURLOPT_VERBOSE "(3), "
89 .BR curl_easy_strerror "(3), " curl_multi_strerror "(3), "
90 .BR curl_share_strerror "(3) "