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hurdsock.c
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1994-06-04
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/* _hurd_socket_server - Find the server for a socket domain.
Copyright (C) 1991, 1992, 1993, 1994 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 <hurd/paths.h>
#include <gnu-stabs.h>
#include <stdio.h>
#include "stdio/_itoa.h"
#include <cthreads.h> /* For `struct mutex'. */
#include "hurdmalloc.h" /* XXX */
static struct mutex lock = MUTEX_INITIALIZER;
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)
{
socket_t server;
HURD_CRITICAL_BEGIN;
__mutex_lock (&lock);
if (domain > max_domain)
{
file_t *new = realloc (servers, (domain + 1) * sizeof (file_t));
if (new == NULL)
{
server = MACH_PORT_NULL;
goto out;
}
while (max_domain < domain)
new[max_domain++] = MACH_PORT_NULL;
servers = new;
}
{
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 = servers[domain] = __path_lookup (np, 0, 0);
}
if (errno == ENOENT)
/* If the server node is absent, we don't support that protocol. */
errno = EPFNOSUPPORT;
out:
__mutex_unlock (&lock);
HURD_CRITICAL_END;
return server;
}