c7e491f9c2
... by using the "\fIopt(3)\fP" syntax they will be linked properly when the web version of the page is generated.
75 lines
3.2 KiB
Groff
75 lines
3.2 KiB
Groff
.\" **************************************************************************
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.\" * _ _ ____ _
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.\" * Project ___| | | | _ \| |
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.\" * / __| | | | |_) | |
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.\" * | (__| |_| | _ <| |___
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.\" * \___|\___/|_| \_\_____|
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.\" *
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.\" * Copyright (C) 1998 - 2014, Daniel Stenberg, <daniel@haxx.se>, et al.
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.\" *
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.\" * This software is licensed as described in the file COPYING, which
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.\" * you should have received as part of this distribution. The terms
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.\" * are also available at http://curl.haxx.se/docs/copyright.html.
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.\" *
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.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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.\" * copies of the Software, and permit persons to whom the Software is
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.\" * furnished to do so, under the terms of the COPYING file.
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.\" *
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.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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.\" * KIND, either express or implied.
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.\" *
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.\" **************************************************************************
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.\"
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.TH curl_easy_recv 3 "29 April 2008" "libcurl 7.18.2" "libcurl Manual"
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.SH NAME
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curl_easy_recv - receives raw data on an "easy" connection
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.SH SYNOPSIS
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.B #include <curl/easy.h>
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.sp
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.BI "CURLcode curl_easy_recv( CURL *" curl ", void *" buffer ","
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.BI "size_t " buflen ", size_t *" n ");"
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.ad
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.SH DESCRIPTION
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This function receives raw data from the established connection. You may use
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it together with \fIcurl_easy_send(3)\fP to implement custom protocols using
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libcurl. This functionality can be particularly useful if you use proxies
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and/or SSL encryption: libcurl will take care of proxy negotiation and
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connection set-up.
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\fBbuffer\fP is a pointer to your buffer that will get the received
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data. \fBbuflen\fP is the maximum amount of data you can get in that
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buffer. The variable \fBn\fP points to will receive the number of received
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bytes.
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To establish the connection, set \fBCURLOPT_CONNECT_ONLY(3)\fP option before
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calling \fIcurl_easy_perform(3)\fP. Note that \fIcurl_easy_recv(3)\fP does not
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work on connections that were created without this option.
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You must ensure that the socket has data to read before calling
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\fIcurl_easy_recv(3)\fP, otherwise the call will return \fBCURLE_AGAIN\fP -
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the socket is used in non-blocking mode internally. Use
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\fIcurl_easy_getinfo(3)\fP with \fBCURLINFO_LASTSOCKET\fP to obtain the
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socket; use your operating system facilities like \fIselect(2)\fP to check if
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it has any data you can read.
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.SH AVAILABILITY
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Added in 7.18.2.
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.SH RETURN VALUE
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On success, returns \fBCURLE_OK\fP, stores the received data into
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\fBbuffer\fP, and the number of bytes it actually read into \fB*n\fP.
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On failure, returns the appropriate error code.
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If there is no data to read, the function returns \fBCURLE_AGAIN\fP. Use your
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operating system facilities to wait until the data is ready, and retry.
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Reading exactly 0 bytes would indicate a closed connection.
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If there's no socket available to use from the previous transfer, this function
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returns CURLE_UNSUPPORTED_PROTOCOL.
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.SH EXAMPLE
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See \fBsendrecv.c\fP in \fBdocs/examples\fP directory for usage example.
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.SH "SEE ALSO"
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.BR curl_easy_setopt "(3), " curl_easy_perform "(3), "
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.BR curl_easy_getinfo "(3), "
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.BR curl_easy_send "(3) "
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