FreeBSD Manual Pages
curl_easy_perform(3) Library Functions Manual curl_easy_perform(3) NAME curl_easy_perform - perform a blocking network transfer SYNOPSIS #include <curl/curl.h> CURLcode curl_easy_perform(CURL *easy_handle); DESCRIPTION curl_easy_perform(3) performs a network transfer in a blocking manner and returns when done, or earlier if it fails. For non-blocking behav- ior, see curl_multi_perform(3). 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. 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 attempts to reuse existing connec- tions for the following transfers, thus making the operations faster, less CPU intense and using less network resources. You probably want to use curl_easy_setopt(3) between the invokes to set options for the fol- lowing curl_easy_perform(3) call. 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). PROTOCOLS This functionality affects all supported protocols EXAMPLE int main(void) { 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 Added in curl 7.1 RETURN VALUE This function returns a CURLcode indicating success or error. CURLE_OK (0) means everything was OK, non-zero means an error occurred, see libcurl-errors(3). If CURLOPT_ERRORBUFFER(3) was set with curl_easy_setopt(3) there can be an error message stored 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 2025-06-03 curl_easy_perform(3)
NAME | SYNOPSIS | DESCRIPTION | PROTOCOLS | EXAMPLE | AVAILABILITY | RETURN VALUE | SEE ALSO
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