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- Introducing curl_easy_send() and curl_easy_recv(). They can be used to send

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and receive data over a connection previously setup with curl_easy_perform()
  and its CURLOPT_CONNECT_ONLY option. The sendrecv.c example was added to
  show how they can be used.
This commit is contained in:
Daniel Stenberg
2008-05-12 21:43:24 +00:00
parent d72efff878
commit 514592b892
16 changed files with 454 additions and 36 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
docs/libcurl/Makefile.am
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@@ -19,7 +19,7 @@ man_MANS = curl_easy_cleanup.3 curl_easy_getinfo.3 curl_easy_init.3 \
libcurl-tutorial.3 curl_easy_reset.3 curl_easy_escape.3 \
curl_easy_unescape.3 curl_multi_setopt.3 curl_multi_socket.3 \
curl_multi_timeout.3 curl_formget.3 curl_multi_assign.3 \
curl_easy_pause.3
curl_easy_pause.3 curl_easy_recv.3 curl_easy_send.3
HTMLPAGES = curl_easy_cleanup.html curl_easy_getinfo.html \
curl_easy_init.html curl_easy_perform.html curl_easy_setopt.html \
@@ -37,7 +37,8 @@ HTMLPAGES = curl_easy_cleanup.html curl_easy_getinfo.html \
curl_share_strerror.html curl_global_init_mem.html libcurl-tutorial.html \
curl_easy_reset.html curl_easy_escape.html curl_easy_unescape.html \
curl_multi_setopt.html curl_multi_socket.html curl_multi_timeout.html \
curl_formget.html curl_multi_assign.html curl_easy_pause.html
curl_formget.html curl_multi_assign.html curl_easy_pause.html \
curl_easy_recv.html curl_easy_send.html
PDFPAGES = curl_easy_cleanup.pdf curl_easy_getinfo.pdf curl_easy_init.pdf \
curl_easy_perform.pdf curl_easy_setopt.pdf curl_easy_duphandle.pdf \
@@ -54,7 +55,8 @@ PDFPAGES = curl_easy_cleanup.pdf curl_easy_getinfo.pdf curl_easy_init.pdf \
curl_share_strerror.pdf curl_global_init_mem.pdf libcurl-tutorial.pdf \
curl_easy_reset.pdf curl_easy_escape.pdf curl_easy_unescape.pdf \
curl_multi_setopt.pdf curl_multi_socket.pdf curl_multi_timeout.pdf \
curl_formget.pdf curl_multi_assign.pdf curl_easy_pause.pdf
curl_formget.pdf curl_multi_assign.pdf curl_easy_pause.pdf \
curl_easy_recv.pdf curl_easy_send.pdf
CLEANFILES = $(HTMLPAGES) $(PDFPAGES)

70
docs/libcurl/curl_easy_recv.3 Normal file
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@@ -0,0 +1,70 @@
.\" **************************************************************************
.\" * _ _ ____ _
.\" * Project ___| | | | _ \| |
.\" * / __| | | | |_) | |
.\" * | (__| |_| | _ <| |___
.\" * \___|\___/|_| \_\_____|
.\" *
.\" * Copyright (C) 1998 - 2008, 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.
.\" *
.\" * $Id$
.\" **************************************************************************
.\"
.TH curl_easy_recv 3 "29 April 2008" "libcurl 7.18.2" "libcurl Manual"
.SH NAME
curl_easy_recv - receives raw data on an "easy" connection
.SH SYNOPSIS
.B #include <curl/easy.h>
.sp
.BI "CURLcode curl_easy_recv( CURL *" curl ", void *" buffer ","
.BI "size_t " buflen ", size_t *" n ");"
.ad
.SH DESCRIPTION
This function receives raw data from the established connection. You may use
it together with \fIcurl_easy_send(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 your buffer that will get the received
data. \fBbuflen\fP is the maximum amount of data you can get in that
buffer. The variable \fBn\fP points to will receive the number of received
bytes.
To establish the connection, set \fBCURLOPT_CONNECT_ONLY\fP option before
calling \fIcurl_easy_perform(3)\fP. Note that \fIcurl_easy_recv(3)\fP does not
work on connections that were created without this option.
You must ensure that the socket has data to read before calling
\fIcurl_easy_recv(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 has any data you can read.
.SH AVAILABILITY
Added in 7.18.2.
.SH RETURN VALUE
On success, returns \fBCURLE_OK\fP, stores the received data into
\fBbuffer\fP, and the number of bytes it actually read into \fB*n\fP.
On failure, returns the appropriate error code.
If there is no data to read, the function returns \fBCURLE_AGAIN\fP. Use
your operating system facilities to wait until the data is ready, and retry.
.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), "
.BR curl_easy_getinfo "(3), "
.BR curl_easy_send "(3) "

65
docs/libcurl/curl_easy_send.3 Normal file
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@@ -0,0 +1,65 @@
.\" **************************************************************************
.\" * _ _ ____ _
.\" * Project ___| | | | _ \| |
.\" * / __| | | | |_) | |
.\" * | (__| |_| | _ <| |___
.\" * \___|\___/|_| \_\_____|
.\" *
.\" * Copyright (C) 1998 - 2008, 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.
.\" *
.\" * $Id$
.\" **************************************************************************
.\"
.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) "

2
docs/libcurl/index.html
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@@ -24,7 +24,9 @@
<br><a href="curl_easy_getinfo.html">curl_easy_getinfo</A>
<br><a href="curl_easy_init.html">curl_easy_init</A>
<br><a href="curl_easy_perform.html">curl_easy_perform</A>
<br><a href="curl_easy_recv.html">curl_easy_recv</A>
<br><a href="curl_easy_reset.html">curl_easy_reset</A>
<br><a href="curl_easy_send.html">curl_easy_send</A>
<br><a href="curl_easy_setopt.html">curl_easy_setopt</A>
<br><a href="curl_easy_strerror.html">curl_easy_strerror</A>
<br><a href="curl_escape.html">curl_escape</A>

6
docs/libcurl/libcurl-errors.3
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@@ -5,7 +5,7 @@
.\" * | (__| |_| | _ <| |___
.\" * \___|\___/|_| \_\_____|
.\" *
.\" * Copyright (C) 1998 - 2007, Daniel Stenberg, <daniel@haxx.se>, et al.
.\" * Copyright (C) 1998 - 2008, 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
@@ -208,6 +208,10 @@ The resource referenced in the URL does not exist
An unspecified error occurred during the SSH session
.IP "CURLE_SSL_SHUTDOWN_FAILED (80)"
Failed to shut down the SSL connection
.IP "CURLE_AGAIN (81)"
Socket is not ready for send/recv wait till it's ready and try again. This
return code is only returned from \fIcurl_easy_recv(3)\fP and
\fIcurl_easy_send(3)\fP (Added in 7.18.2)
.IP "CURLE_OBSOLETE*"
These error codes will never be returned. They used to be used in an old libcurl
version and are currently unused.