1 .\" **************************************************************************
3 .\" * Project ___| | | | _ \| |
4 .\" * / __| | | | |_) | |
5 .\" * | (__| |_| | _ <| |___
6 .\" * \___|\___/|_| \_\_____|
8 .\" * Copyright (C) 1998 - 2014, Daniel Stenberg, <daniel@haxx.se>, et al.
10 .\" * This software is licensed as described in the file COPYING, which
11 .\" * you should have received as part of this distribution. The terms
12 .\" * are also available at https://curl.haxx.se/docs/copyright.html.
14 .\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
15 .\" * copies of the Software, and permit persons to whom the Software is
16 .\" * furnished to do so, under the terms of the COPYING file.
18 .\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
19 .\" * KIND, either express or implied.
21 .\" **************************************************************************
23 .TH CURLOPT_INTERFACE 3 "17 Jun 2014" "libcurl 7.37.0" "curl_easy_setopt options"
25 CURLOPT_INTERFACE \- source interface for outgoing traffic
27 #include <curl/curl.h>
29 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_INTERFACE, char *interface);
31 Pass a char * as parameter. This sets the \fIinterface\fP name to use as
32 outgoing network interface. The name can be an interface name, an IP address,
35 If the parameter starts with "if!" then it is treated as only as interface
36 name and no attempt will ever be named to do treat it as an IP address or to
37 do name resolution on it. If the parameter starts with \&"host!" it is
38 treated as either an IP address or a hostname. Hostnames are resolved
39 synchronously. Using the if! format is highly recommended when using the
40 multi interfaces to avoid allowing the code to block. If "if!" is specified
41 but the parameter does not match an existing interface, CURLE_INTERFACE_FAILED
42 is returned from the libcurl function used to perform the transfer.
44 The application does not have to keep the string around after setting this
47 NULL, use whatever the TCP stack finds suitable
53 The "if!" and "host!" syntax was added in 7.24.0.
55 Returns CURLE_OK on success or
56 CURLE_OUT_OF_MEMORY if there was insufficient heap space.
58 .BR CURLOPT_SOCKOPTFUNCTION "(3), " CURLOPT_TCP_NODELAY "(3), "