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glibc/hurd/hurdsock.c
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/* _hurd_socket_server - Find the server for a socket domain. | |
Copyright (C) 1991-2016 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 | |
<http://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 <cthreads.h> /* For `struct mutex'. */ | |
#include "hurdmalloc.h" /* XXX */ | |
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; | |
} | |
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; | |
return server; | |
} | |
static void | |
init (void) | |
{ | |
int i; | |
__mutex_init (&lock); | |
for (i = 0; i < max_domain; ++i) | |
servers[i] = MACH_PORT_NULL; | |
(void) &init; /* Avoid "defined but not used" warning. */ | |
} | |
text_set_element (_hurd_preinit_hook, init); |