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/* _hurd_socket_server - Find the server for a socket domain.
Copyright (C) 1991-2021 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);
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