CURLOPT_UNIX_SOCKET_PATH(3)curl_easy_setopt optionsCURLOPT_UNIX_SOCKET_PATH(3)

NAME
       CURLOPT_UNIX_SOCKET_PATH - set Unix domain socket

SYNOPSIS
       #include <curl/curl.h>

       CURLcode  curl_easy_setopt(CURL *handle, CURLOPT_UNIX_SOCKET_PATH, char
       *path);

DESCRIPTION
       Enables the use of Unix domain sockets as connection endpoint and  sets
       the  path  to  path. If path is NULL, then Unix domain sockets are dis-
       abled. An empty string will result in an error at some point,  it  will
       not disable use of Unix domain sockets.

       When  enabled,  curl  will connect to the Unix domain socket instead of
       establishing a TCP connection to a host. Since  no  TCP  connection  is
       created, 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 it might be even less.

       Proxy and TCP options such as CURLOPT_TCP_NODELAY(3) are not supported.
       Proxy  options  such as 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.

       The  application  does not have to keep the string around after setting
       this option.

DEFAULT
       Default is NULL, meaning that no Unix domain sockets are used.

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).

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 */

AVAILABILITY
       Since 7.40.0.

RETURN VALUE
       Returns CURLE_OK if the option is supported,  and  CURLE_UNKNOWN_OPTION
       if not.

SEE ALSO
       CURLOPT_OPENSOCKETFUNCTION(3), unix(7),

libcurl 7.54.0                 December 21, 2016   CURLOPT_UNIX_SOCKET_PATH(3)