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curl_easy_recv(3) [osx man page]

curl_easy_recv(3)						  libcurl Manual						 curl_easy_recv(3)

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 option before calling curl_easy_perform(3). Note that curl_easy_recv(3) does not work on connections that were created without this option. You must ensure that the socket has data to read before calling curl_easy_recv(3), otherwise the call will return CURLE_AGAIN - the socket is used in non-blocking mode internally. Use curl_easy_getinfo(3) with CURLINFO_LASTSOCKET to obtain the socket; use your operating system facilities like select(2) to check if it has any data you can read. 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. If there is no data to read, the function returns CURLE_AGAIN. Use your operating system facilities to wait until the data is ready, and retry. Reading exactly 0 bytes would indicate 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 7.18.2 29 April 2008 curl_easy_recv(3)

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curl_easy_perform(3)						  libcurl Manual					      curl_easy_perform(3)

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, ""); 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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