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28f540f4 | 1 | /* _hurd_socket_server - Find the server for a socket domain. |
bfff8b1b | 2 | Copyright (C) 1991-2017 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 | |
41bdb6e2 AJ |
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. | |
c84142e8 UD |
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 | |
41bdb6e2 | 13 | Lesser General Public License for more details. |
c84142e8 | 14 | |
41bdb6e2 | 15 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 PE |
16 | License along with the GNU C Library; if not, see |
17 | <http://www.gnu.org/licenses/>. */ | |
28f540f4 RM |
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> | |
eb96ffb0 | 25 | #include <_itoa.h> |
28f540f4 RM |
26 | #include <cthreads.h> /* For `struct mutex'. */ |
27 | #include "hurdmalloc.h" /* XXX */ | |
28 | ||
29 | static struct mutex lock; | |
30 | ||
31 | static file_t *servers; | |
13f03ba4 | 32 | static int max_domain = -1; |
28f540f4 RM |
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 | ||
44 | socket_t | |
45 | _hurd_socket_server (int domain, int dead) | |
46 | { | |
47 | socket_t server; | |
48 | ||
63643c85 PT |
49 | if (domain < 0) |
50 | { | |
51 | errno = EAFNOSUPPORT; | |
52 | return MACH_PORT_NULL; | |
53 | } | |
54 | ||
28f540f4 RM |
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 | { | |
2d616b0b | 64 | do |
13f03ba4 | 65 | new[++max_domain] = MACH_PORT_NULL; |
2d616b0b | 66 | while (max_domain < domain); |
28f540f4 RM |
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. */ | |
173b756d | 100 | errno = EAFNOSUPPORT; |
28f540f4 RM |
101 | |
102 | __mutex_unlock (&lock); | |
103 | HURD_CRITICAL_END; | |
104 | ||
105 | return server; | |
106 | } | |
107 | \f | |
108 | static void | |
109 | init (void) | |
110 | { | |
1e9dc039 | 111 | int i; |
28f540f4 RM |
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 | } | |
120 | text_set_element (_hurd_preinit_hook, init); |