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| .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\fP option before |
| calling \fIcurl_easy_perform(3)\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. |
| .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) " |
