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ae49f218da
hurd initialization stages use RUN_HOOK to run various initialization functions. That is however using absolute addresses which need to be relocated, which is done later by csu. We can however easily make the linker compute relative addresses which thus don't need a relocation. The new SET_RELHOOK and RUN_RELHOOK macros implement this.
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) 1991-2021 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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