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.\" **************************************************************************
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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 https://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 CURLOPT_INTERFACE 3 "17 Jun 2014" "libcurl 7.37.0" "curl_easy_setopt options"
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.SH NAME
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CURLOPT_INTERFACE \- source interface for outgoing traffic
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.SH SYNOPSIS
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#include <curl/curl.h>
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CURLcode curl_easy_setopt(CURL *handle, CURLOPT_INTERFACE, char *interface);
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.SH DESCRIPTION
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Pass a char * as parameter. This sets the \fIinterface\fP name to use as
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outgoing network interface. The name can be an interface name, an IP address,
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or a host name.
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If the parameter starts with "if!" then it is treated as only as interface
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name and no attempt will ever be named to do treat it as an IP address or to
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do name resolution on it. If the parameter starts with \&"host!" it is
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treated as either an IP address or a hostname. Hostnames are resolved
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synchronously. Using the if! format is highly recommended when using the
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multi interfaces to avoid allowing the code to block. If "if!" is specified
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but the parameter does not match an existing interface, CURLE_INTERFACE_FAILED
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is returned from the libcurl function used to perform the transfer.
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The application does not have to keep the string around after setting this
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option.
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.SH DEFAULT
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NULL, use whatever the TCP stack finds suitable
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.SH PROTOCOLS
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All
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.SH EXAMPLE
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TODO
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.SH AVAILABILITY
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The "if!" and "host!" syntax was added in 7.24.0.
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.SH RETURN VALUE
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Returns CURLE_OK on success or
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CURLE_OUT_OF_MEMORY if there was insufficient heap space.
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.SH "SEE ALSO"
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.BR CURLOPT_SOCKOPTFUNCTION "(3), " CURLOPT_TCP_NODELAY "(3), "
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