1 files changed, 115 insertions, 0 deletions
diff --git a/hurd/hurdsock.c b/hurd/hurdsock.c
new file mode 100644
index 0000000000..266fd40d31
--- /dev/null
+++ b/hurd/hurdsock.c
@@ -0,0 +1,115 @@
+/* _hurd_socket_server - Find the server for a socket domain.
+
+Copyright (C) 1991, 1992, 1993, 1994, 1995 Free Software Foundation, Inc.
+This file is part of the GNU C Library.
+
+The GNU C Library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Library General Public License as
+published by the Free Software Foundation; either version 2 of the
+License, or (at your option) any later version.
+
+The GNU C Library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB.  If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA.  */
+
+#include <hurd.h>
+#include <sys/socket.h>
+#include <stdlib.h>
+#include <string.h>
+#include <hurd/paths.h>
+#include <stdio.h>
+#include "stdio/_itoa.h"
+#include <cthreads.h>		/* For `struct mutex'.  */
+#include "hurdmalloc.h"		/* XXX */
+
+static struct mutex lock;
+
+static file_t *servers;
+static int max_domain;
+
+/* Return a port to the socket server for DOMAIN.
+   Socket servers translate nodes in the directory _SERVERS_SOCKET
+   (canonically /servers/socket).  These naming point nodes are named
+   by the simplest decimal representation of the socket domain number,
+   for example "/servers/socket/3".
+
+   Socket servers are assumed not to change very often.
+   The library keeps all the server socket ports it has ever looked up,
+   and does not look them up in /servers/socket more than once.  */
+
+socket_t
+_hurd_socket_server (int domain, int dead)
+{
+  socket_t server;
+
+  HURD_CRITICAL_BEGIN;
+  __mutex_lock (&lock);
+
+  if (domain > max_domain)
+    {
+      error_t save = errno;
+      file_t *new = realloc (servers, (domain + 1) * sizeof (file_t));
+      if (new != NULL)
+	{
+	  while (max_domain <= domain)
+	    new[max_domain++] = MACH_PORT_NULL;
+	  servers = new;
+	}
+      else
+	/* No space to cache the port; we will just fetch it anew below.  */
+	errno = save;
+    }
+
+  if (dead && domain <= max_domain)
+    {
+      /* The user says the port we returned earlier (now in SERVERS[DOMAIN])
+	 was dead.  Clear the cache and fetch a new one below.  */
+      __mach_port_deallocate (__mach_task_self (), servers[domain]);
+      servers[domain] = MACH_PORT_NULL;
+    }
+
+  if (domain > max_domain || servers[domain] == MACH_PORT_NULL)
+    {
+      char name[sizeof (_SERVERS_SOCKET) + 100];
+      char *np = &name[sizeof (name)];
+      *--np = '\0';
+      np = _itoa (domain, np, 10, 0);
+      *--np = '/';
+      np -= sizeof (_SERVERS_SOCKET) - 1;
+      memcpy (np, _SERVERS_SOCKET, sizeof (_SERVERS_SOCKET) - 1);
+      server = __file_name_lookup (np, 0, 0);
+      if (domain <= max_domain)
+	servers[domain] = server;
+    }
+  else
+    server = servers[domain];
+
+  if (server == MACH_PORT_NULL && errno == ENOENT)
+    /* If the server node is absent, we don't support that protocol.  */
+    errno = EPFNOSUPPORT;
+
+  __mutex_unlock (&lock);
+  HURD_CRITICAL_END;
+
+  return server;
+}
+
+static void
+init (void)
+{
+  size_t i;
+
+  __mutex_init (&lock);
+
+  for (i = 0; i < max_domain; ++i)
+    servers[i] = MACH_PORT_NULL;
+
+  (void) &init;			/* Avoid "defined but not used" warning.  */
+}
+text_set_element (_hurd_preinit_hook, init);