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Diffstat (limited to 'docs/libcurl/opts')
| -rw-r--r-- | docs/libcurl/opts/CURLOPT_UNIX_SOCKET_PATH.3 | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/docs/libcurl/opts/CURLOPT_UNIX_SOCKET_PATH.3 b/docs/libcurl/opts/CURLOPT_UNIX_SOCKET_PATH.3 new file mode 100644 index 000000000..880c2f71f --- /dev/null +++ b/docs/libcurl/opts/CURLOPT_UNIX_SOCKET_PATH.3 @@ -0,0 +1,76 @@ +.\" ************************************************************************** +.\" * _ _ ____ _ +.\" * Project ___| | | | _ \| | +.\" * / __| | | | |_) | | +.\" * | (__| |_| | _ <| |___ +.\" * \___|\___/|_| \_\_____| +.\" * +.\" * Copyright (C) 1998 - 2014, 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. +.\" * +.\" ************************************************************************** +.\" +.TH CURLOPT_UNIX_SOCKET_PATH 3 "09 Oct 2014" "libcurl 7.40.0" "curl_easy_setopt options" +.SH NAME +CURLOPT_UNIX_SOCKET_PATH \- set UNIX domain socket +.SH SYNOPSIS +#include <curl/curl.h> + +CURLcode curl_easy_setopt(CURL *handle, CURLOPT_UNIX_SOCKET_PATH, char *path); +.SH DESCRIPTION +Enables the use of UNIX domain sockets as connection end point and sets the path +to \fIpath\fP. If \fIpath\fP is NULL, then UNIX domain sockets are disabled. An +empty string will result in an error at some point. + +When enabled, cURL will connect to the UNIX domain socket instead of +establishing a TCP connection to a host. Since no TCP connection is established, +cURL does not need to resolve the DNS hostname in the URL. + +The maximum path length on Cygwin, Linux and Solaris is 107. On other platforms +might be even less. + +Proxy and TCP options such as +.BR CURLOPT_TCP_NODELAY "(3) +are not supported. Proxy options such as +.BR CURLOPT_PROXY "(3) +have no effect either as these are TCP-oriented, and asking a proxy server to +connect to a certain UNIX domain socket is not possible. +.SH DEFAULT +Default is NULL, meaning that no UNIX domain sockets are used. +.SH PROTOCOLS +All protocols except for file:// and FTP are supported in theory. HTTP, IMAP, +POP3 and SMTP should in particular work (including their SSL/TLS variants). +.SH EXAMPLE +Given that you have an nginx server running, listening on /tmp/nginx.sock, you +can request a HTTP resource with: + + curl_easy_setopt(curl_handle, CURLOPT_UNIX_SOCKET_PATH, "/tmp/nginx.sock"); + curl_easy_setopt(curl_handle, CURLOPT_URL, "http://localhost/"); + +If you are on Linux and somehow have a need for paths larger than 107 bytes, you +could use the proc filesystem to bypass the limitation: + + int dirfd = open(long_directory_path_to_socket, O_DIRECTORY | O_RDONLY); + char path[108]; + snprintf(path, sizeof(path), "/proc/self/fd/%d/nginx.sock", dirfd); + curl_easy_setopt(curl_handle, CURLOPT_UNIX_SOCKET_PATH, path); + /* Be sure to keep dirfd valid until you discard the handle */ + +.SH AVAILABILITY +Since 7.40.0. +.SH RETURN VALUE +Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not. +.SH "SEE ALSO" +.BR CURLOPT_OPENSOCKETFUNCTION "(3) +, +.BR unix "(7) |