1 | /* $NetBSD: sem.h,v 1.32 2015/11/06 02:26:42 pgoyette Exp $ */ |
2 | |
3 | /*- |
4 | * Copyright (c) 1999 The NetBSD Foundation, Inc. |
5 | * All rights reserved. |
6 | * |
7 | * This code is derived from software contributed to The NetBSD Foundation |
8 | * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility, |
9 | * NASA Ames Research Center. |
10 | * |
11 | * Redistribution and use in source and binary forms, with or without |
12 | * modification, are permitted provided that the following conditions |
13 | * are met: |
14 | * 1. Redistributions of source code must retain the above copyright |
15 | * notice, this list of conditions and the following disclaimer. |
16 | * 2. Redistributions in binary form must reproduce the above copyright |
17 | * notice, this list of conditions and the following disclaimer in the |
18 | * documentation and/or other materials provided with the distribution. |
19 | * |
20 | * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS |
21 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
22 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
23 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS |
24 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
25 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
26 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
27 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
28 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
29 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
30 | * POSSIBILITY OF SUCH DAMAGE. |
31 | */ |
32 | |
33 | /* |
34 | * SVID compatible sem.h file |
35 | * |
36 | * Author: Daniel Boulet |
37 | */ |
38 | |
39 | #ifndef _SYS_SEM_H_ |
40 | #define _SYS_SEM_H_ |
41 | |
42 | #include <sys/featuretest.h> |
43 | |
44 | #include <sys/ipc.h> |
45 | |
46 | #ifdef _KERNEL |
47 | struct __sem { |
48 | unsigned short semval; /* semaphore value */ |
49 | pid_t sempid; /* pid of last operation */ |
50 | unsigned short semncnt; /* # awaiting semval > cval */ |
51 | unsigned short semzcnt; /* # awaiting semval = 0 */ |
52 | }; |
53 | #endif /* _KERNEL */ |
54 | |
55 | struct semid_ds { |
56 | struct ipc_perm sem_perm; /* operation permission structure */ |
57 | unsigned short sem_nsems; /* number of semaphores in set */ |
58 | time_t sem_otime; /* last semop() time */ |
59 | time_t sem_ctime; /* last time changed by semctl() */ |
60 | |
61 | /* |
62 | * These members are private and used only in the internal |
63 | * implementation of this interface. |
64 | */ |
65 | struct __sem *_sem_base; /* pointer to first semaphore in set */ |
66 | }; |
67 | |
68 | /* |
69 | * semop's sops parameter structure |
70 | */ |
71 | struct sembuf { |
72 | unsigned short sem_num; /* semaphore # */ |
73 | short sem_op; /* semaphore operation */ |
74 | short sem_flg; /* operation flags */ |
75 | }; |
76 | #define SEM_UNDO 010000 /* undo changes on process exit */ |
77 | |
78 | /* |
79 | * commands for semctl |
80 | */ |
81 | #define GETNCNT 3 /* Return the value of semncnt {READ} */ |
82 | #define GETPID 4 /* Return the value of sempid {READ} */ |
83 | #define GETVAL 5 /* Return the value of semval {READ} */ |
84 | #define GETALL 6 /* Return semvals into arg.array {READ} */ |
85 | #define GETZCNT 7 /* Return the value of semzcnt {READ} */ |
86 | #define SETVAL 8 /* Set the value of semval to arg.val {ALTER} */ |
87 | #define SETALL 9 /* Set semvals from arg.array {ALTER} */ |
88 | |
89 | #ifdef _KERNEL |
90 | /* |
91 | * Kernel implementation stuff |
92 | */ |
93 | #define SEMVMX 32767 /* semaphore maximum value */ |
94 | #define SEMAEM 16384 /* adjust on exit max value */ |
95 | |
96 | /* |
97 | * Permissions |
98 | */ |
99 | #define SEM_A 0200 /* alter permission */ |
100 | #define SEM_R 0400 /* read permission */ |
101 | |
102 | /* |
103 | * Undo structure (one per process) |
104 | */ |
105 | struct sem_undo_entry { |
106 | short un_adjval; /* adjust on exit values */ |
107 | short un_num; /* semaphore # */ |
108 | int un_id; /* semid */ |
109 | }; |
110 | |
111 | struct sem_undo { |
112 | struct sem_undo *un_next; /* ptr to next active undo structure */ |
113 | struct proc *un_proc; /* owner of this structure */ |
114 | short un_cnt; /* # of active entries */ |
115 | struct sem_undo_entry un_ent[1];/* undo entries */ |
116 | }; |
117 | #endif /* _KERNEL */ |
118 | |
119 | #if defined(_NETBSD_SOURCE) |
120 | /* |
121 | * semaphore info struct |
122 | */ |
123 | struct seminfo { |
124 | int32_t semmap; /* # of entries in semaphore map */ |
125 | int32_t semmni; /* # of semaphore identifiers */ |
126 | int32_t semmns; /* # of semaphores in system */ |
127 | int32_t semmnu; /* # of undo structures in system */ |
128 | int32_t semmsl; /* max # of semaphores per id */ |
129 | int32_t semopm; /* max # of operations per semop call */ |
130 | int32_t semume; /* max # of undo entries per process */ |
131 | int32_t semusz; /* size in bytes of undo structure */ |
132 | int32_t semvmx; /* semaphore maximum value */ |
133 | int32_t semaem; /* adjust on exit max value */ |
134 | }; |
135 | |
136 | /* Warning: 64-bit structure padding is needed here */ |
137 | struct semid_ds_sysctl { |
138 | struct ipc_perm_sysctl sem_perm; |
139 | int16_t sem_nsems; |
140 | int16_t pad2; |
141 | int32_t pad3; |
142 | time_t sem_otime; |
143 | time_t sem_ctime; |
144 | }; |
145 | struct sem_sysctl_info { |
146 | struct seminfo seminfo; |
147 | struct semid_ds_sysctl semids[1]; |
148 | }; |
149 | |
150 | /* |
151 | * Internal "mode" bits. The first of these is used by ipcs(1), and so |
152 | * is defined outside the kernel as well. |
153 | */ |
154 | #define SEM_ALLOC 01000 /* semaphore is allocated */ |
155 | #endif /* !_POSIX_C_SOURCE && !_XOPEN_SOURCE */ |
156 | |
157 | #ifdef _KERNEL |
158 | #define SEM_DEST 02000 /* semaphore will be destroyed on last detach */ |
159 | |
160 | /* |
161 | * Configuration parameters |
162 | */ |
163 | #ifndef SEMMNI |
164 | #define SEMMNI 10 /* # of semaphore identifiers */ |
165 | #endif |
166 | #ifndef SEMMNS |
167 | #define SEMMNS 60 /* # of semaphores in system */ |
168 | #endif |
169 | #ifndef SEMUME |
170 | #define SEMUME 10 /* max # of undo entries per process */ |
171 | #endif |
172 | #ifndef SEMMNU |
173 | #define SEMMNU 30 /* # of undo structures in system */ |
174 | #endif |
175 | |
176 | /* shouldn't need tuning */ |
177 | #ifndef SEMMAP |
178 | #define SEMMAP 30 /* # of entries in semaphore map */ |
179 | #endif |
180 | #ifndef SEMMSL |
181 | #define SEMMSL SEMMNS /* max # of semaphores per id */ |
182 | #endif |
183 | #ifndef SEMOPM |
184 | #define SEMOPM 100 /* max # of operations per semop call */ |
185 | #endif |
186 | |
187 | /* actual size of an undo structure */ |
188 | #define SEMUSZ (sizeof(struct sem_undo)+sizeof(struct sem_undo_entry)*SEMUME) |
189 | |
190 | /* |
191 | * Structures allocated in machdep.c |
192 | */ |
193 | extern struct seminfo seminfo; |
194 | extern struct semid_ds *sema; /* semaphore id pool */ |
195 | |
196 | /* |
197 | * Parameters to the semconfig system call |
198 | */ |
199 | #define SEM_CONFIG_FREEZE 0 /* Freeze the semaphore facility. */ |
200 | #define SEM_CONFIG_THAW 1 /* Thaw the semaphore facility. */ |
201 | |
202 | #define SYSCTL_FILL_SEM(src, dst) do { \ |
203 | SYSCTL_FILL_PERM((src).sem_perm, (dst).sem_perm); \ |
204 | (dst).sem_nsems = (src).sem_nsems; \ |
205 | (dst).sem_otime = (src).sem_otime; \ |
206 | (dst).sem_ctime = (src).sem_ctime; \ |
207 | } while (/*CONSTCOND*/ 0) |
208 | |
209 | #endif /* _KERNEL */ |
210 | |
211 | #ifndef _KERNEL |
212 | #include <sys/cdefs.h> |
213 | |
214 | __BEGIN_DECLS |
215 | #ifndef __LIBC12_SOURCE__ |
216 | int semctl(int, int, int, ...) __RENAME(__semctl50); |
217 | #endif |
218 | int semget(key_t, int, int); |
219 | int semop(int, struct sembuf *, size_t); |
220 | #if defined(_NETBSD_SOURCE) |
221 | int semconfig(int); |
222 | #endif |
223 | __END_DECLS |
224 | #else |
225 | void seminit(struct sysctllog **); |
226 | int semfini(void); |
227 | void semexit(struct proc *, void *); |
228 | |
229 | int semctl1(struct lwp *, int, int, int, void *, register_t *); |
230 | #define get_semctl_arg(cmd, sembuf, arg) \ |
231 | ((cmd) == IPC_SET || (cmd) == IPC_STAT ? (void *)sembuf \ |
232 | : (cmd) == GETALL || (cmd) == SETVAL || (cmd) == SETALL ? (void *)arg \ |
233 | : NULL) |
234 | #endif /* !_KERNEL */ |
235 | |
236 | #endif /* !_SYS_SEM_H_ */ |
237 | |