| 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 | |