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| .\" * Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al. |
| .\" * |
| .\" * This software is licensed as described in the file COPYING, which |
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| .\" |
| .TH CURLOPT_UNIX_SOCKET_PATH 3 "09 Oct 2014" libcurl libcurl |
| .SH NAME |
| CURLOPT_UNIX_SOCKET_PATH \- Unix domain socket |
| .SH SYNOPSIS |
| .nf |
| #include <curl/curl.h> |
| |
| CURLcode curl_easy_setopt(CURL *handle, CURLOPT_UNIX_SOCKET_PATH, char *path); |
| .fi |
| .SH DESCRIPTION |
| Enables the use of Unix domain sockets as connection endpoint and sets the |
| path to \fIpath\fP. If \fIpath\fP is NULL, then Unix domain sockets are |
| disabled. |
| |
| When enabled, curl connects to the Unix domain socket instead of establishing |
| a TCP connection to the host. Since no network connection is created, curl |
| does not resolve the DNS hostname in the URL. |
| |
| The maximum path length on Cygwin, Linux and Solaris is 107. On other platforms |
| it might be even less. |
| |
| Proxy and TCP options such as \fICURLOPT_TCP_NODELAY(3)\fP are not |
| supported. Proxy options such as \fICURLOPT_PROXY(3)\fP 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. |
| |
| The application does not have to keep the string around after setting this |
| option. |
| .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 |
| .nf |
| int main(void) |
| { |
| CURL *curl = curl_easy_init(); |
| if(curl) { |
| curl_easy_setopt(curl, CURLOPT_UNIX_SOCKET_PATH, "/tmp/httpd.sock"); |
| curl_easy_setopt(curl, CURLOPT_URL, "http://localhost/"); |
| |
| curl_easy_perform(curl); |
| } |
| } |
| .fi |
| |
| If you are on Linux and somehow have a need for paths larger than 107 bytes, |
| you can use the proc filesystem to bypass the limitation: |
| |
| .nf |
| int dirfd = open(long_directory_path_to_socket, O_DIRECTORY | O_RDONLY); |
| char path[108]; |
| snprintf(path, sizeof(path), "/proc/self/fd/%d/httpd.sock", dirfd); |
| curl_easy_setopt(curl_handle, CURLOPT_UNIX_SOCKET_PATH, path); |
| /* Be sure to keep dirfd valid until you discard the handle */ |
| .fi |
| .SH AVAILABILITY |
| Added in 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_ABSTRACT_UNIX_SOCKET (3), |
| .BR CURLOPT_OPENSOCKETFUNCTION (3), |
| .BR unix (7) |