Prepare for radical source tree reorganization.zack/build-layout-experiment

All top-level files and directories are moved into a temporary storage
directory, REORG.TODO, except for files that will certainly still
exist in their current form at top level when we're done (COPYING,
COPYING.LIB, LICENSES, NEWS, README), all old ChangeLog files (which
are moved to the new directory OldChangeLogs, instead), and the
generated file INSTALL (which is just deleted; in the new order, there
will be no generated files checked into version control).

1 files changed, 120 insertions, 0 deletions

diff --git a/REORG.TODO/hurd/hurdsock.c b/REORG.TODO/hurd/hurdsock.c
new file mode 100644
index 0000000000..de4158def8
--- /dev/null
+++ b/REORG.TODO/hurd/hurdsock.c
@@ -0,0 +1,120 @@
+/* _hurd_socket_server - Find the server for a socket domain.
+   Copyright (C) 1991-2017 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 Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <hurd.h>
+#include <sys/socket.h>
+#include <stdlib.h>
+#include <string.h>
+#include <hurd/paths.h>
+#include <stdio.h>
+#include <_itoa.h>
+#include <cthreads.h>		/* For `struct mutex'.  */
+#include "hurdmalloc.h"		/* XXX */
+
+static struct mutex lock;
+
+static file_t *servers;
+static int max_domain = -1;
+
+/* 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;
+
+  if (domain < 0)
+    {
+      errno = EAFNOSUPPORT;
+      return MACH_PORT_NULL;
+    }
+
+  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)
+	{
+	  do
+	    new[++max_domain] = MACH_PORT_NULL;
+	  while (max_domain < domain);
+	  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 = EAFNOSUPPORT;
+
+  __mutex_unlock (&lock);
+  HURD_CRITICAL_END;
+
+  return server;
+}
+
+static void
+init (void)
+{
+  int 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);