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28f540f4 | 1 | /* _hurd_socket_server - Find the server for a socket domain. |
13f03ba4 | 2 | Copyright (C) 1991,92,93,94,95,97,99 Free Software Foundation, Inc. |
c84142e8 UD |
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 Library General Public License as | |
7 | published by the Free Software Foundation; either version 2 of the | |
8 | 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 | Library General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Library General Public | |
16 | License along with the GNU C Library; see the file COPYING.LIB. If not, | |
17 | write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
18 | Boston, MA 02111-1307, USA. */ | |
28f540f4 RM |
19 | |
20 | #include <hurd.h> | |
21 | #include <sys/socket.h> | |
22 | #include <stdlib.h> | |
23 | #include <string.h> | |
24 | #include <hurd/paths.h> | |
25 | #include <stdio.h> | |
cabcc273 | 26 | #include "stdio-common/_itoa.h" |
28f540f4 RM |
27 | #include <cthreads.h> /* For `struct mutex'. */ |
28 | #include "hurdmalloc.h" /* XXX */ | |
29 | ||
30 | static struct mutex lock; | |
31 | ||
32 | static file_t *servers; | |
13f03ba4 | 33 | static int max_domain = -1; |
28f540f4 RM |
34 | |
35 | /* Return a port to the socket server for DOMAIN. | |
36 | Socket servers translate nodes in the directory _SERVERS_SOCKET | |
37 | (canonically /servers/socket). These naming point nodes are named | |
38 | by the simplest decimal representation of the socket domain number, | |
39 | for example "/servers/socket/3". | |
40 | ||
41 | Socket servers are assumed not to change very often. | |
42 | The library keeps all the server socket ports it has ever looked up, | |
43 | and does not look them up in /servers/socket more than once. */ | |
44 | ||
45 | socket_t | |
46 | _hurd_socket_server (int domain, int dead) | |
47 | { | |
48 | socket_t server; | |
49 | ||
50 | HURD_CRITICAL_BEGIN; | |
51 | __mutex_lock (&lock); | |
52 | ||
53 | if (domain > max_domain) | |
54 | { | |
55 | error_t save = errno; | |
56 | file_t *new = realloc (servers, (domain + 1) * sizeof (file_t)); | |
57 | if (new != NULL) | |
58 | { | |
59 | while (max_domain <= domain) | |
13f03ba4 | 60 | new[++max_domain] = MACH_PORT_NULL; |
28f540f4 RM |
61 | servers = new; |
62 | } | |
63 | else | |
64 | /* No space to cache the port; we will just fetch it anew below. */ | |
65 | errno = save; | |
66 | } | |
67 | ||
68 | if (dead && domain <= max_domain) | |
69 | { | |
70 | /* The user says the port we returned earlier (now in SERVERS[DOMAIN]) | |
71 | was dead. Clear the cache and fetch a new one below. */ | |
72 | __mach_port_deallocate (__mach_task_self (), servers[domain]); | |
73 | servers[domain] = MACH_PORT_NULL; | |
74 | } | |
75 | ||
76 | if (domain > max_domain || servers[domain] == MACH_PORT_NULL) | |
77 | { | |
78 | char name[sizeof (_SERVERS_SOCKET) + 100]; | |
79 | char *np = &name[sizeof (name)]; | |
80 | *--np = '\0'; | |
81 | np = _itoa (domain, np, 10, 0); | |
82 | *--np = '/'; | |
83 | np -= sizeof (_SERVERS_SOCKET) - 1; | |
84 | memcpy (np, _SERVERS_SOCKET, sizeof (_SERVERS_SOCKET) - 1); | |
85 | server = __file_name_lookup (np, 0, 0); | |
86 | if (domain <= max_domain) | |
87 | servers[domain] = server; | |
88 | } | |
89 | else | |
90 | server = servers[domain]; | |
91 | ||
92 | if (server == MACH_PORT_NULL && errno == ENOENT) | |
93 | /* If the server node is absent, we don't support that protocol. */ | |
94 | errno = EPFNOSUPPORT; | |
95 | ||
96 | __mutex_unlock (&lock); | |
97 | HURD_CRITICAL_END; | |
98 | ||
99 | return server; | |
100 | } | |
101 | \f | |
102 | static void | |
103 | init (void) | |
104 | { | |
1e9dc039 | 105 | int i; |
28f540f4 RM |
106 | |
107 | __mutex_init (&lock); | |
108 | ||
109 | for (i = 0; i < max_domain; ++i) | |
110 | servers[i] = MACH_PORT_NULL; | |
111 | ||
112 | (void) &init; /* Avoid "defined but not used" warning. */ | |
113 | } | |
114 | text_set_element (_hurd_preinit_hook, init); |