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CURLOPT_UNIX_SOCKET_PATH(3)                           Library Functions Manual


NAME

       CURLOPT_UNIX_SOCKET_PATH - 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
       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 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

       NULL - no Unix domain sockets are used.


PROTOCOLS

       This functionality affects all supported protocols


EXAMPLE

       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);
         }
       }

       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:

         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 */


AVAILABILITY

       Added in curl 7.40.0


RETURN VALUE

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


SEE ALSO

       CURLOPT_ABSTRACT_UNIX_SOCKET(3), CURLOPT_OPENSOCKETFUNCTION(3), unix(7)

libcurl                           2024-08-05       CURLOPT_UNIX_SOCKET_PATH(3)

curl 8.9.1 - Generated Wed Aug 7 10:51:00 CDT 2024
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