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_se-
topt(3) calls are made, and it performs 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 earlier if it fails. For non-blocking behav-
ior, 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 operations
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.
A network transfer moves data to a peer or from a peer. An application
tells libcurl how to receive data by setting the CURLOPT_WRITEFUNC-
TION(3) and CURLOPT_WRITEDATA(3) options. To tell libcurl what data to
send, there are a few more alternatives but two common ones are CUR-
LOPT_READFUNCTION(3) and CURLOPT_POSTFIELDS(3).
While the easy_handle is added to a multi handle, it cannot be used by
curl_easy_perform(3).
EXAMPLE
CURL *curl = curl_easy_init();
if(curl) {
CURLcode res;
curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
res = curl_easy_perform(curl);
curl_easy_cleanup(curl);
}
AVAILABILITY
Always
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 CURLOPT_ERROR-
BUFFER(3) was set with curl_easy_setopt(3) there will be a readable er-
ror message in the error buffer when non-zero is returned.
SEE ALSO
curl_easy_init(3), curl_easy_setopt(3), curl_multi_add_handle(3),
curl_multi_perform(3), libcurl-errors(3),
libcurl 7.81.0 November 26, 2021 curl_easy_perform(3)
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