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82 lines
3.4 KiB
Groff
82 lines
3.4 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 - 2020, 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.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_UNIX_SOCKET_PATH 3 "09 Oct 2014" "libcurl 7.40.0" "curl_easy_setopt options"
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.SH NAME
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CURLOPT_UNIX_SOCKET_PATH \- set Unix domain socket
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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_UNIX_SOCKET_PATH, char *path);
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.SH DESCRIPTION
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Enables the use of Unix domain sockets as connection endpoint and sets the path
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to \fIpath\fP. If \fIpath\fP is NULL, then Unix domain sockets are disabled. An
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empty string will result in an error at some point, it will not disable use of
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Unix domain sockets.
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When enabled, curl will connect to the Unix domain socket instead of
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establishing a TCP connection to a host. Since no TCP connection is created,
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curl does not need to resolve the DNS hostname in the URL.
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The maximum path length on Cygwin, Linux and Solaris is 107. On other platforms
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it might be even less.
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Proxy and TCP options such as
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.BR CURLOPT_TCP_NODELAY "(3)
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are not supported. Proxy options such as
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.BR CURLOPT_PROXY "(3)
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have no effect either as these are TCP-oriented, and asking a proxy server to
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connect to a certain Unix domain socket is not possible.
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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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Default is NULL, meaning that no Unix domain sockets are used.
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.SH PROTOCOLS
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All protocols except for file:// and FTP are supported in theory. HTTP, IMAP,
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POP3 and SMTP should in particular work (including their SSL/TLS variants).
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.SH EXAMPLE
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Given that you have an nginx server running, listening on /tmp/nginx.sock, you
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can request an HTTP resource with:
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.nf
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curl_easy_setopt(curl_handle, CURLOPT_UNIX_SOCKET_PATH, "/tmp/nginx.sock");
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curl_easy_setopt(curl_handle, CURLOPT_URL, "http://localhost/");
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.fi
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If you are on Linux and somehow have a need for paths larger than 107 bytes, you
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could use the proc filesystem to bypass the limitation:
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.nf
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int dirfd = open(long_directory_path_to_socket, O_DIRECTORY | O_RDONLY);
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char path[108];
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snprintf(path, sizeof(path), "/proc/self/fd/%d/nginx.sock", dirfd);
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curl_easy_setopt(curl_handle, CURLOPT_UNIX_SOCKET_PATH, path);
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/* Be sure to keep dirfd valid until you discard the handle */
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.fi
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.SH AVAILABILITY
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Since 7.40.0.
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.SH RETURN VALUE
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Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
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.SH "SEE ALSO"
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.BR CURLOPT_OPENSOCKETFUNCTION "(3), " unix "(7), "
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