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 +1,93 @@
+---
+c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
+SPDX-License-Identifier: curl
+Title: CURLOPT_OPENSOCKETDATA
+Section: 3
+Source: libcurl
+See-also:
+  - CURLOPT_CLOSESOCKETFUNCTION (3)
+  - CURLOPT_OPENSOCKETFUNCTION (3)
+  - CURLOPT_SOCKOPTFUNCTION (3)
+Protocol:
+  - All
+Added-in: 7.17.1
+---
+
+# NAME
+
+CURLOPT_OPENSOCKETDATA - pointer passed to open socket callback
+
+# SYNOPSIS
+
+~~~c
+#include <curl/curl.h>
+
+CURLcode curl_easy_setopt(CURL *handle, CURLOPT_OPENSOCKETDATA, void *pointer);
+~~~
+
+# DESCRIPTION
+
+Pass a *pointer* that is untouched by libcurl and passed as the first
+argument in the open socket callback set with
+CURLOPT_OPENSOCKETFUNCTION(3).
+
+# DEFAULT
+
+NULL
+
+# %PROTOCOLS%
+
+# EXAMPLE
+
+~~~c
+/* make libcurl use the already established socket 'sockfd' */
+
+static curl_socket_t opensocket(void *clientp,
+                                curlsocktype purpose,
+                                struct curl_sockaddr *address)
+{
+  curl_socket_t sockfd;
+  sockfd = *(curl_socket_t *)clientp;
+  /* the actual externally set socket is passed in via the OPENSOCKETDATA
+     option */
+  return sockfd;
+}
+
+static int sockopt_callback(void *clientp, curl_socket_t curlfd,
+                            curlsocktype purpose)
+{
+  return CURL_SOCKOPT_ALREADY_CONNECTED;
+}
+
+int main(void)
+{
+  CURL *curl = curl_easy_init();
+  if(curl) {
+    CURLcode res;
+    extern int sockfd; /* the already connected one */
+
+    /* libcurl thinks that you connect to the host
+     * and port that you specify in the URL option. */
+    curl_easy_setopt(curl, CURLOPT_URL, "http://99.99.99.99:9999");
+    /* call this function to get a socket */
+    curl_easy_setopt(curl, CURLOPT_OPENSOCKETFUNCTION, opensocket);
+    curl_easy_setopt(curl, CURLOPT_OPENSOCKETDATA, &sockfd);
+
+    /* call this function to set options for the socket */
+    curl_easy_setopt(curl, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
+
+    res = curl_easy_perform(curl);
+
+    curl_easy_cleanup(curl);
+  }
+}
+~~~
+
+# %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).