curlopt_errorbuffer(3) [mojave man page]

CURLOPT_ERRORBUFFER(3)					     curl_easy_setopt options					    CURLOPT_ERRORBUFFER(3)

NAME

       CURLOPT_ERRORBUFFER - set 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 the libcurl may store human readable error messages in 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  very  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.

       Consider CURLOPT_VERBOSE(3) and CURLOPT_DEBUGFUNCTION(3) to better debug and trace why errors happen.

       If the library does not return an error, the buffer may not have been touched. Do not rely on the contents in those cases.

DEFAULT

       NULL

PROTOCOLS

       All

EXAMPLE

       curl = curl_easy_init();
       if(curl) {
	 CURLcode res;
	 char errbuf[CURL_ERROR_SIZE];

	 curl_easy_setopt(curl, CURLOPT_URL, "http://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, "
libcurl: (%d) ", res);
	   if(len)
	     fprintf(stderr, "%s%s", errbuf,
		     ((errbuf[len - 1] != '
') ? "
" : ""));
	   else
	     fprintf(stderr, "%s
", 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)

libcurl 7.54.0							 February 03, 2016					    CURLOPT_ERRORBUFFER(3)

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CURLOPT_TIMEOUT_MS(3)					     curl_easy_setopt options					     CURLOPT_TIMEOUT_MS(3)

NAME

       CURLOPT_TIMEOUT_MS - set maximum time the request is allowed to take

SYNOPSIS

       #include <curl/curl.h>

       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_TIMEOUT_MS, long timeout);

DESCRIPTION

       Pass  a long as parameter containing timeout - the maximum time in milliseconds that you allow the libcurl transfer operation to take. Nor-
       mally, name lookups can take a considerable time and limiting operations to less than a few minutes risk aborting perfectly  normal  opera-
       tions. This option may cause libcurl to use the SIGALRM signal to timeout system calls.

       If  libcurl is built to use the standard system name resolver, that portion of the transfer will still use full-second resolution for time-
       outs with a minimum timeout allowed of one second.

       In unix-like systems, this might cause signals to be used unless CURLOPT_NOSIGNAL(3) is set.

       If both CURLOPT_TIMEOUT(3) and CURLOPT_TIMEOUT_MS(3) are set, the value set last will be used.

       Since this puts a hard limit for how long time a request is allowed to take, it has limited use in dynamic use cases with varying  transfer
       times. You are then advised to explore CURLOPT_LOW_SPEED_LIMIT(3), CURLOPT_LOW_SPEED_TIME(3) or using CURLOPT_PROGRESSFUNCTION(3) to imple-
       ment your own timeout logic.

DEFAULT

       Default timeout is 0 (zero) which means it never times out during transfer.

PROTOCOLS

       All

EXAMPLE

       CURL *curl = curl_easy_init();
       if(curl) {
	 curl_easy_setopt(curl, CURLOPT_URL, "http://example.com");

	 /* complete within 20000 milliseconds */
	 curl_easy_setopt(curl, CURLOPT_TIMEOUT_MS, 20000L);

	 curl_easy_perform(curl);
       }

AVAILABILITY

       Always

RETURN VALUE

       Returns CURLE_OK

SEE ALSO

       CURLOPT_TIMEOUT(3), CURLOPT_CONNECTTIMEOUT(3), CURLOPT_LOW_SPEED_LIMIT(3),

libcurl 7.54.0							 February 03, 2016					     CURLOPT_TIMEOUT_MS(3)

Linux and UNIX Man Pages

curlopt_errorbuffer(3) [mojave man page]

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