trusty (3) curl_easy_send.3.gz

NAME

       curl_easy_send - sends raw data over an "easy" connection

SYNOPSIS

       #include <curl/easy.h>

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

DESCRIPTION

       This  function  sends  arbitrary  data  over  the  established  connection.  You may use it together with
       curl_easy_recv(3) to implement custom protocols 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 the data of length buflen that you want sent.   The  variable  n  points  to  will
       receive the number of sent bytes.

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

       You must ensure that the socket is writable before calling curl_easy_send(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 can be written to.

AVAILABILITY

       Added in 7.18.2.

RETURN VALUE

       On  success,  returns  CURLE_OK  and stores the number of bytes actually sent into *n. Note that this may
       very well be less than the amount you wanted to send.

       On failure, returns the appropriate error code.

       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_recv(3)