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curl_easy_send.3
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.\" ************************************************************************** .\" * _ _ ____ _ .\" * Project ___| | | | _ \| | .\" * / __| | | | |_) | | .\" * | (__| |_| | _ <| |___ .\" * \___|\___/|_| \_\_____| .\" * .\" * Copyright (C) 1998 - 2015, Daniel Stenberg, <daniel@haxx.se>, et al. .\" * .\" * This software is licensed as described in the file COPYING, which .\" * you should have received as part of this distribution. The terms .\" * are also available at http://curl.haxx.se/docs/copyright.html. .\" * .\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell .\" * copies of the Software, and permit persons to whom the Software is .\" * furnished to do so, under the terms of the COPYING file. .\" * .\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY .\" * KIND, either express or implied. .\" * .\" ************************************************************************** .\" .TH curl_easy_send 3 "29 April 2008" "libcurl 7.18.2" "libcurl Manual" .SH NAME curl_easy_send - sends raw data over an "easy" connection .SH SYNOPSIS .B #include <curl/easy.h> .sp .BI "CURLcode curl_easy_send( CURL *" curl ", const void *" buffer "," .BI " size_t " buflen ", size_t *" n ");" .ad .SH DESCRIPTION This function sends arbitrary data over the established connection. You may use it together with \fIcurl_easy_recv(3)\fP 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. \fBbuffer\fP is a pointer to the data of length \fBbuflen\fP that you want sent. The variable \fBn\fP points to will receive the number of sent bytes. To establish the connection, set \fBCURLOPT_CONNECT_ONLY(3)\fP option before calling \fIcurl_easy_perform(3)\fP or \fIcurl_multi_perform()\fP. Note that \fIcurl_easy_send(3)\fP will not work on connections that were created without this option. You must ensure that the socket is writable before calling \fIcurl_easy_send(3)\fP, otherwise the call will return \fBCURLE_AGAIN\fP - the socket is used in non-blocking mode internally. Use \fIcurl_easy_getinfo(3)\fP with \fBCURLINFO_LASTSOCKET\fP to obtain the socket; use your operating system facilities like \fIselect(2)\fP to check if it can be written to. .SH AVAILABILITY Added in 7.18.2. .SH RETURN VALUE On success, returns \fBCURLE_OK\fP and stores the number of bytes actually sent into \fB*n\fP. 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. .SH EXAMPLE See \fBsendrecv.c\fP in \fBdocs/examples\fP directory for usage example. .SH "SEE ALSO" .BR curl_easy_setopt "(3), " curl_easy_perform "(3), " curl_easy_getinfo "(3), " .BR curl_easy_recv "(3) "