Update networking layer w/ CURL and emscripten impl

2025-11-08 01:50:36 +11:00
parent a17925904d
commit f6874dc55a
4105 changed files with 694617 additions and 179 deletions
@@ -0,0 +1,91 @@
+---
+c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
+SPDX-License-Identifier: curl
+Title: CURLOPT_UNIX_SOCKET_PATH
+Section: 3
+Source: libcurl
+See-also:
+  - CURLOPT_ABSTRACT_UNIX_SOCKET (3)
+  - CURLOPT_OPENSOCKETFUNCTION (3)
+  - unix (7)
+Protocol:
+  - All
+Added-in: 7.40.0
+---
+
+# NAME
+
+CURLOPT_UNIX_SOCKET_PATH - Unix domain socket
+
+# SYNOPSIS
+
+~~~c
+#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.
+
+Using this option multiple times makes the last set string override the
+previous ones. Set it to NULL to disable its use again.
+
+# DEFAULT
+
+NULL - no Unix domain sockets are used.
+
+# %PROTOCOLS%
+
+# EXAMPLE
+
+~~~c
+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* file system to bypass the limitation:
+
+~~~c
+  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%
+
+# RETURN VALUE
+
+curl_easy_setopt(3) returns a CURLcode indicating success or error.
+
+CURLE_OK (0) means everything was OK, non-zero means an error occurred, see
+libcurl-errors(3).