curl_easy_perform(3) [mojave man page]

curl_easy_perform(3)						  libcurl Manual					      curl_easy_perform(3)

NAME

       curl_easy_perform - perform a blocking file transfer

SYNOPSIS

       #include <curl/curl.h>

       CURLcode curl_easy_perform(CURL *easy_handle);

DESCRIPTION

       Invoke  this function after curl_easy_init(3) and all the curl_easy_setopt(3) calls are made, and will perform the transfer as described in
       the options. It must be called with the same easy_handle as input as the curl_easy_init(3) call returned.

       curl_easy_perform(3) performs the entire request in a blocking manner and returns when done, or if it failed.  For  non-blocking  behavior,
       see curl_multi_perform(3).

       You  can do any amount of calls to curl_easy_perform(3) while using the same easy_handle. If you intend to transfer more than one file, you
       are even encouraged to do so. libcurl will then attempt to re-use the same connection for the following transfers, thus making  the  opera-
       tions  faster,  less  CPU  intense  and	using  less network resources. Just note that you will have to use curl_easy_setopt(3) between the
       invokes to set options for the following curl_easy_perform.

       You must never call this function simultaneously from two places using the same easy_handle. Let the function return first before  invoking
       it another time. If you want parallel transfers, you must use several curl easy_handles.

       While the easy_handle is added to a multi handle, it cannot be used by curl_easy_perform(3).

RETURN VALUE

       CURLE_OK  (0)  means  everything  was  ok,  non-zero  means an error occurred as <curl/curl.h> defines - see libcurl-errors(3). If the CUR-
       LOPT_ERRORBUFFER(3) was set with curl_easy_setopt(3) there will be a readable error message in the error buffer when non-zero is returned.

EXAMPLE

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

SEE ALSO

       curl_easy_init(3), curl_easy_setopt(3), curl_multi_add_handle(3), curl_multi_perform(3), libcurl-errors(3),

libcurl 7.54.0							   May 02, 2016 					      curl_easy_perform(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

curl_easy_perform(3) [mojave man page]

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