88 lines
2.2 KiB
Markdown
88 lines
2.2 KiB
Markdown
---
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c: Copyright (C) Daniel Stenberg, <daniel.se>, et al.
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SPDX-License-Identifier: curl
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Title: CURLOPT_UNIX_SOCKET_PATH
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Section: 3
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Source: libcurl
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See-also:
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- CURLOPT_ABSTRACT_UNIX_SOCKET (3)
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- CURLOPT_OPENSOCKETFUNCTION (3)
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- unix (7)
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---
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# NAME
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CURLOPT_UNIX_SOCKET_PATH - Unix domain socket
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# SYNOPSIS
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~~~c
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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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~~~
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# DESCRIPTION
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Enables the use of Unix domain sockets as connection endpoint and sets the
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path to *path*. If *path* is NULL, then Unix domain sockets are
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disabled.
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When enabled, curl connects to the Unix domain socket instead of establishing
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a TCP connection to the host. Since no network connection is created, curl
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does not 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 CURLOPT_TCP_NODELAY(3) are not
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supported. Proxy options such as CURLOPT_PROXY(3) have no effect either
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as these are TCP-oriented, and asking a proxy server to connect to a certain
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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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# DEFAULT
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Default is NULL, meaning that no Unix domain sockets are used.
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# 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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# EXAMPLE
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~~~c
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int main(void)
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{
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CURL *curl = curl_easy_init();
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if(curl) {
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curl_easy_setopt(curl, CURLOPT_UNIX_SOCKET_PATH, "/tmp/httpd.sock");
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curl_easy_setopt(curl, CURLOPT_URL, "http://localhost/");
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curl_easy_perform(curl);
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}
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}
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~~~
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If you are on Linux and somehow have a need for paths larger than 107 bytes,
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you can use the proc filesystem to bypass the limitation:
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~~~c
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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/httpd.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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~~~
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# AVAILABILITY
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Added in 7.40.0.
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# RETURN VALUE
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Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
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