curl_easy_recv(3) [mojave man page]

curl_easy_recv(3)						  libcurl Manual						 curl_easy_recv(3)

NAME

       curl_easy_recv - receives raw data on an "easy" connection

SYNOPSIS

       #include <curl/easy.h>

       CURLcode curl_easy_recv( CURL *curl, void *buffer, size_t buflen, size_t *n);

DESCRIPTION

       This  function receives raw data from the established connection. You may use it together with curl_easy_send(3) to implement custom proto-
       cols using libcurl. This functionality can be particularly useful if you use proxies and/or SSL encryption: libcurl will take care of proxy
       negotiation and connection set-up.

       buffer  is  a  pointer to your buffer that will get the received data. buflen is the maximum amount of data you can get in that buffer. The
       variable n points to will receive the number of received bytes.

       To establish the connection, set CURLOPT_CONNECT_ONLY(3) option before calling curl_easy_perform(3)  or	curl_multi_perform(3).	Note  that
       curl_easy_recv(3) does not work on connections that were created without this option.

       The  call  will	return	CURLE_AGAIN  if there is no data to read - the socket is used in non-blocking mode internally. When CURLE_AGAIN is
       returned, use your operating system facilities like select(2) to wait for data. The socket may be obtained using curl_easy_getinfo(3)  with
       CURLINFO_ACTIVESOCKET(3).

       Wait  on  the socket only if curl_easy_recv(3) returns CURLE_AGAIN.  The reason for this is libcurl or the SSL library may internally cache
       some data, therefore you should call curl_easy_recv(3) until all data is read which would include any cached data.

       Furthermore if you wait on the socket and it tells you there is data to read, curl_easy_recv(3) may return CURLE_AGAIN  if  the	only  data
       that was read was for internal SSL processing, and no other data is available.

AVAILABILITY

       Added in 7.18.2.

RETURN VALUE

       On success, returns CURLE_OK, stores the received data into buffer, and the number of bytes it actually read into *n.

       On failure, returns the appropriate error code.

       The function may return CURLE_AGAIN. In this case, use your operating system facilities to wait until data can be read, and retry.

       Reading exactly 0 bytes indicates a closed connection.

       If there's no socket available to use from the previous transfer, this function returns CURLE_UNSUPPORTED_PROTOCOL.

EXAMPLE

       See sendrecv.c in docs/examples directory for usage example.

SEE ALSO

       curl_easy_setopt(3), curl_easy_perform(3), curl_easy_getinfo(3), curl_easy_send(3)

libcurl 7.54.0							 December 18, 2016						 curl_easy_recv(3)

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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)

Linux and UNIX Man Pages

curl_easy_recv(3) [mojave man page]

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