124 lines
3.5 KiB
C
124 lines
3.5 KiB
C
|
/* _hurd_socket_server - Find the server for a socket domain.
|
|||
|
|
Copyright (C) 1991-2022 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
|
|||
|
|
<https://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 <lock-intern.h> /* For `struct mutex'. */
|
|||
|
|
#include "hurdmalloc.h" /* XXX */
|
|||
|
|
#include "set-hooks.h"
|
|||
|
|
|
|||
|
|
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;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
retry:
|
|||
|
|
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;
|
|||
|
|
if (server == MACH_PORT_NULL && errno == EINTR)
|
|||
|
|
/* Got a signal while inside an RPC of the critical section, retry again */
|
|||
|
|
goto retry;
|
|||
|
|
|
|||
|
|
return server;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
static void attribute_used_retain
|
|||
|
|
init (void)
|
|||
|
|
{
|
|||
|
|
int i;
|
|||
|
|
|
|||
|
|
__mutex_init (&lock);
|
|||
|
|
|
|||
|
|
for (i = 0; i < max_domain; ++i)
|
|||
|
|
servers[i] = MACH_PORT_NULL;
|
|||
|
|
}
|
|||
|
|
SET_RELHOOK (_hurd_preinit_hook, init);
|