124 lines
3.5 KiB
C
124 lines
3.5 KiB
C
/* _hurd_socket_server - Find the server for a socket domain.
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Copyright (C) 1991-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <hurd.h>
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#include <sys/socket.h>
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#include <stdlib.h>
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#include <string.h>
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#include <hurd/paths.h>
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#include <stdio.h>
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#include <_itoa.h>
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#include <lock-intern.h> /* For `struct mutex'. */
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#include "hurdmalloc.h" /* XXX */
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#include "set-hooks.h"
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static struct mutex lock;
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static file_t *servers;
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static int max_domain = -1;
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/* Return a port to the socket server for DOMAIN.
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Socket servers translate nodes in the directory _SERVERS_SOCKET
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(canonically /servers/socket). These naming point nodes are named
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by the simplest decimal representation of the socket domain number,
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for example "/servers/socket/3".
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Socket servers are assumed not to change very often.
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The library keeps all the server socket ports it has ever looked up,
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and does not look them up in /servers/socket more than once. */
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socket_t
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_hurd_socket_server (int domain, int dead)
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{
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socket_t server;
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if (domain < 0)
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{
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errno = EAFNOSUPPORT;
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return MACH_PORT_NULL;
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}
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retry:
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HURD_CRITICAL_BEGIN;
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__mutex_lock (&lock);
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if (domain > max_domain)
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{
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error_t save = errno;
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file_t *new = realloc (servers, (domain + 1) * sizeof (file_t));
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if (new != NULL)
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{
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do
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new[++max_domain] = MACH_PORT_NULL;
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while (max_domain < domain);
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servers = new;
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}
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else
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/* No space to cache the port; we will just fetch it anew below. */
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errno = save;
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}
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if (dead && domain <= max_domain)
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{
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/* The user says the port we returned earlier (now in SERVERS[DOMAIN])
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was dead. Clear the cache and fetch a new one below. */
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__mach_port_deallocate (__mach_task_self (), servers[domain]);
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servers[domain] = MACH_PORT_NULL;
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}
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if (domain > max_domain || servers[domain] == MACH_PORT_NULL)
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{
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char name[sizeof (_SERVERS_SOCKET) + 100];
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char *np = &name[sizeof (name)];
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*--np = '\0';
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np = _itoa (domain, np, 10, 0);
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*--np = '/';
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np -= sizeof (_SERVERS_SOCKET) - 1;
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memcpy (np, _SERVERS_SOCKET, sizeof (_SERVERS_SOCKET) - 1);
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server = __file_name_lookup (np, 0, 0);
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if (domain <= max_domain)
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servers[domain] = server;
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}
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else
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server = servers[domain];
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if (server == MACH_PORT_NULL && errno == ENOENT)
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/* If the server node is absent, we don't support that protocol. */
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errno = EAFNOSUPPORT;
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__mutex_unlock (&lock);
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HURD_CRITICAL_END;
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if (server == MACH_PORT_NULL && errno == EINTR)
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/* Got a signal while inside an RPC of the critical section, retry again */
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goto retry;
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return server;
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}
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static void attribute_used_retain
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init (void)
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{
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int i;
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__mutex_init (&lock);
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for (i = 0; i < max_domain; ++i)
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servers[i] = MACH_PORT_NULL;
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}
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SET_RELHOOK (_hurd_preinit_hook, init);
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