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1/* _hurd_socket_server - Find the server for a socket domain.
2 Copyright (C) 1991-2019 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <http://www.gnu.org/licenses/>. */
18
19#include <hurd.h>
20#include <sys/socket.h>
21#include <stdlib.h>
22#include <string.h>
23#include <hurd/paths.h>
24#include <stdio.h>
25#include <_itoa.h>
26#include <cthreads.h> /* For `struct mutex'. */
27#include "hurdmalloc.h" /* XXX */
28
29static struct mutex lock;
30
31static file_t *servers;
32static int max_domain = -1;
33
34/* Return a port to the socket server for DOMAIN.
35 Socket servers translate nodes in the directory _SERVERS_SOCKET
36 (canonically /servers/socket). These naming point nodes are named
37 by the simplest decimal representation of the socket domain number,
38 for example "/servers/socket/3".
39
40 Socket servers are assumed not to change very often.
41 The library keeps all the server socket ports it has ever looked up,
42 and does not look them up in /servers/socket more than once. */
43
44socket_t
45_hurd_socket_server (int domain, int dead)
46{
47 socket_t server;
48
49 if (domain < 0)
50 {
51 errno = EAFNOSUPPORT;
52 return MACH_PORT_NULL;
53 }
54
55 HURD_CRITICAL_BEGIN;
56 __mutex_lock (&lock);
57
58 if (domain > max_domain)
59 {
60 error_t save = errno;
61 file_t *new = realloc (servers, (domain + 1) * sizeof (file_t));
62 if (new != NULL)
63 {
64 do
65 new[++max_domain] = MACH_PORT_NULL;
66 while (max_domain < domain);
67 servers = new;
68 }
69 else
70 /* No space to cache the port; we will just fetch it anew below. */
71 errno = save;
72 }
73
74 if (dead && domain <= max_domain)
75 {
76 /* The user says the port we returned earlier (now in SERVERS[DOMAIN])
77 was dead. Clear the cache and fetch a new one below. */
78 __mach_port_deallocate (__mach_task_self (), servers[domain]);
79 servers[domain] = MACH_PORT_NULL;
80 }
81
82 if (domain > max_domain || servers[domain] == MACH_PORT_NULL)
83 {
84 char name[sizeof (_SERVERS_SOCKET) + 100];
85 char *np = &name[sizeof (name)];
86 *--np = '\0';
87 np = _itoa (domain, np, 10, 0);
88 *--np = '/';
89 np -= sizeof (_SERVERS_SOCKET) - 1;
90 memcpy (np, _SERVERS_SOCKET, sizeof (_SERVERS_SOCKET) - 1);
91 server = __file_name_lookup (np, 0, 0);
92 if (domain <= max_domain)
93 servers[domain] = server;
94 }
95 else
96 server = servers[domain];
97
98 if (server == MACH_PORT_NULL && errno == ENOENT)
99 /* If the server node is absent, we don't support that protocol. */
100 errno = EAFNOSUPPORT;
101
102 __mutex_unlock (&lock);
103 HURD_CRITICAL_END;
104
105 return server;
106}
107
108static void
109init (void)
110{
111 int i;
112
113 __mutex_init (&lock);
114
115 for (i = 0; i < max_domain; ++i)
116 servers[i] = MACH_PORT_NULL;
117
118 (void) &init; /* Avoid "defined but not used" warning. */
119}
120text_set_element (_hurd_preinit_hook, init);
121

Warning: That file was not part of the compilation database. It may have many parsing errors.