1 | /* |
2 | * Copyright (c) 2000-2007 Apple Inc. All rights reserved. |
3 | * |
4 | * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ |
5 | * |
6 | * This file contains Original Code and/or Modifications of Original Code |
7 | * as defined in and that are subject to the Apple Public Source License |
8 | * Version 2.0 (the 'License'). You may not use this file except in |
9 | * compliance with the License. The rights granted to you under the License |
10 | * may not be used to create, or enable the creation or redistribution of, |
11 | * unlawful or unlicensed copies of an Apple operating system, or to |
12 | * circumvent, violate, or enable the circumvention or violation of, any |
13 | * terms of an Apple operating system software license agreement. |
14 | * |
15 | * Please obtain a copy of the License at |
16 | * http://www.opensource.apple.com/apsl/ and read it before using this file. |
17 | * |
18 | * The Original Code and all software distributed under the License are |
19 | * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER |
20 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, |
21 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, |
22 | * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. |
23 | * Please see the License for the specific language governing rights and |
24 | * limitations under the License. |
25 | * |
26 | * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ |
27 | */ |
28 | /* $NetBSD: sem.h,v 1.5 1994/06/29 06:45:15 cgd Exp $ */ |
29 | |
30 | /* |
31 | * SVID compatible sem.h file |
32 | * |
33 | * Author: Daniel Boulet |
34 | * John Bellardo modified the implementation for Darwin. 12/2000 |
35 | */ |
36 | |
37 | #ifndef _SYS_SEM_H_ |
38 | #define _SYS_SEM_H_ |
39 | |
40 | |
41 | #include <sys/cdefs.h> |
42 | #include <sys/_types.h> |
43 | #include <machine/types.h> /* __int32_t */ |
44 | |
45 | /* |
46 | * [XSI] All of the symbols from <sys/ipc.h> SHALL be defined |
47 | * when this header is included |
48 | */ |
49 | #include <sys/ipc.h> |
50 | |
51 | |
52 | /* |
53 | * [XSI] The pid_t, time_t, key_t, and size_t types shall be defined as |
54 | * described in <sys/types.h>. |
55 | * |
56 | * NOTE: The definition of the key_t type is implicit from the |
57 | * inclusion of <sys/ipc.h> |
58 | */ |
59 | #include <sys/_types/_pid_t.h> |
60 | #include <sys/_types/_time_t.h> |
61 | #include <sys/_types/_size_t.h> |
62 | |
63 | /* |
64 | * Technically, we should force all code references to the new structure |
65 | * definition, not in just the standards conformance case, and leave the |
66 | * legacy interface there for binary compatibility only. Currently, we |
67 | * are only forcing this for programs requesting standards conformance. |
68 | */ |
69 | #if __DARWIN_UNIX03 || defined(KERNEL) |
70 | #pragma pack(4) |
71 | /* |
72 | * Structure used internally. |
73 | * |
74 | * This structure is exposed because standards dictate that it is used as |
75 | * the semun union member 'buf' as the fourth argment to semctl() when the |
76 | * third argument is IPC_STAT or IPC_SET. |
77 | * |
78 | * Note: only the fields sem_perm, sem_nsems, sem_otime, and sem_ctime |
79 | * are meaningful in user space. |
80 | */ |
81 | #if (defined(_POSIX_C_SOURCE) && !defined(_DARWIN_C_SOURCE)) |
82 | struct semid_ds |
83 | #else |
84 | #define semid_ds __semid_ds_new |
85 | struct __semid_ds_new |
86 | #endif |
87 | { |
88 | struct __ipc_perm_new sem_perm; /* [XSI] operation permission struct */ |
89 | __int32_t sem_base; /* 32 bit base ptr for semaphore set */ |
90 | unsigned short sem_nsems; /* [XSI] number of sems in set */ |
91 | time_t sem_otime; /* [XSI] last operation time */ |
92 | __int32_t sem_pad1; /* RESERVED: DO NOT USE! */ |
93 | time_t sem_ctime; /* [XSI] last change time */ |
94 | /* Times measured in secs since */ |
95 | /* 00:00:00 GMT, Jan. 1, 1970 */ |
96 | __int32_t sem_pad2; /* RESERVED: DO NOT USE! */ |
97 | __int32_t sem_pad3[4]; /* RESERVED: DO NOT USE! */ |
98 | }; |
99 | #pragma pack() |
100 | #else /* !__DARWIN_UNIX03 */ |
101 | #define semid_ds __semid_ds_old |
102 | #endif /* __DARWIN_UNIX03 */ |
103 | |
104 | #if !__DARWIN_UNIX03 |
105 | struct __semid_ds_old { |
106 | struct __ipc_perm_old sem_perm; /* [XSI] operation permission struct */ |
107 | __int32_t sem_base; /* 32 bit base ptr for semaphore set */ |
108 | unsigned short sem_nsems; /* [XSI] number of sems in set */ |
109 | time_t sem_otime; /* [XSI] last operation time */ |
110 | __int32_t sem_pad1; /* RESERVED: DO NOT USE! */ |
111 | time_t sem_ctime; /* [XSI] last change time */ |
112 | /* Times measured in secs since */ |
113 | /* 00:00:00 GMT, Jan. 1, 1970 */ |
114 | __int32_t sem_pad2; /* RESERVED: DO NOT USE! */ |
115 | __int32_t sem_pad3[4]; /* RESERVED: DO NOT USE! */ |
116 | }; |
117 | #endif /* !__DARWIN_UNIX03 */ |
118 | |
119 | /* |
120 | * Possible values for the third argument to semctl() |
121 | */ |
122 | #define GETNCNT 3 /* [XSI] Return the value of semncnt {READ} */ |
123 | #define GETPID 4 /* [XSI] Return the value of sempid {READ} */ |
124 | #define GETVAL 5 /* [XSI] Return the value of semval {READ} */ |
125 | #define GETALL 6 /* [XSI] Return semvals into arg.array {READ} */ |
126 | #define GETZCNT 7 /* [XSI] Return the value of semzcnt {READ} */ |
127 | #define SETVAL 8 /* [XSI] Set the value of semval to arg.val {ALTER} */ |
128 | #define SETALL 9 /* [XSI] Set semvals from arg.array {ALTER} */ |
129 | |
130 | |
131 | /* A semaphore; this is an anonymous structure, not for external use */ |
132 | struct sem { |
133 | unsigned short semval; /* semaphore value */ |
134 | pid_t sempid; /* pid of last operation */ |
135 | unsigned short semncnt; /* # awaiting semval > cval */ |
136 | unsigned short semzcnt; /* # awaiting semval == 0 */ |
137 | }; |
138 | |
139 | |
140 | /* |
141 | * Structure of array element for second argument to semop() |
142 | */ |
143 | struct sembuf { |
144 | unsigned short sem_num; /* [XSI] semaphore # */ |
145 | short sem_op; /* [XSI] semaphore operation */ |
146 | short sem_flg; /* [XSI] operation flags */ |
147 | }; |
148 | |
149 | /* |
150 | * Possible flag values for sem_flg |
151 | */ |
152 | #define SEM_UNDO 010000 /* [XSI] Set up adjust on exit entry */ |
153 | |
154 | |
155 | #if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE) |
156 | |
157 | /* |
158 | * Union used as the fourth argment to semctl() in all cases. Specific |
159 | * member values are used for different values of the third parameter: |
160 | * |
161 | * Command Member |
162 | * ------------------------------------------- ------ |
163 | * GETALL, SETALL array |
164 | * SETVAL val |
165 | * IPC_STAT, IPC_SET buf |
166 | * |
167 | * The union definition is intended to be defined by the user application |
168 | * in conforming applications; it is provided here for two reasons: |
169 | * |
170 | * 1) Historical source compatability for non-conforming applications |
171 | * expecting this header to declare the union type on their behalf |
172 | * |
173 | * 2) Documentation; specifically, 64 bit applications that do not pass |
174 | * this structure for 'val', or, alternately, a 64 bit type, will |
175 | * not function correctly |
176 | */ |
177 | union semun { |
178 | int val; /* value for SETVAL */ |
179 | struct semid_ds *buf; /* buffer for IPC_STAT & IPC_SET */ |
180 | unsigned short *array; /* array for GETALL & SETALL */ |
181 | }; |
182 | typedef union semun semun_t; |
183 | |
184 | |
185 | /* |
186 | * Permissions |
187 | */ |
188 | #define SEM_A 0200 /* alter permission */ |
189 | #define SEM_R 0400 /* read permission */ |
190 | |
191 | #endif /* (!_POSIX_C_SOURCE || _DARWIN_C_SOURCE) */ |
192 | |
193 | |
194 | |
195 | #ifndef KERNEL |
196 | |
197 | __BEGIN_DECLS |
198 | #if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE) |
199 | int semsys(int, ...); |
200 | #endif /* (!_POSIX_C_SOURCE || _DARWIN_C_SOURCE) */ |
201 | int semctl(int, int, int, ...) __DARWIN_ALIAS(semctl); |
202 | int semget(key_t, int, int); |
203 | int semop(int, struct sembuf *, size_t); |
204 | __END_DECLS |
205 | |
206 | #endif /* !KERNEL */ |
207 | |
208 | #endif /* !_SEM_H_ */ |
209 | |