1/* $NetBSD: sem.h,v 1.5 1994/06/29 06:45:15 cgd Exp $ */ 2 3/* 4 * SVID compatible sem.h file 5 * 6 * Author: Daniel Boulet 7 */ 8 9#ifndef _SYS_SEM_H_ 10#define _SYS_SEM_H_ 11 12#ifdef _WANT_SYSVSEM_INTERNALS 13#define _WANT_SYSVIPC_INTERNALS 14#endif 15#include <sys/ipc.h> 16 17#ifndef _PID_T_DECLARED 18typedef __pid_t pid_t; 19#define _PID_T_DECLARED 20#endif 21 22#ifndef _SIZE_T_DECLARED 23typedef __size_t size_t; 24#define _SIZE_T_DECLARED 25#endif 26 27#ifndef _TIME_T_DECLARED 28typedef __time_t time_t; 29#define _TIME_T_DECLARED 30#endif 31 32#if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 33 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) 34struct semid_ds_old { 35 struct ipc_perm_old sem_perm; /* operation permission struct */ 36 struct sem *__sem_base; /* pointer to first semaphore in set */ 37 unsigned short sem_nsems; /* number of sems in set */ 38 time_t sem_otime; /* last operation time */ 39 long sem_pad1; /* SVABI/386 says I need this here */ 40 time_t sem_ctime; /* last change time */ 41 /* Times measured in secs since */ 42 /* 00:00:00 UTC, Jan. 1, 1970, without leap seconds */ 43 long sem_pad2; /* SVABI/386 says I need this here */ 44 long sem_pad3[4]; /* SVABI/386 says I need this here */ 45}; 46#endif 47 48struct semid_ds { 49 struct ipc_perm sem_perm; /* operation permission struct */ 50 struct sem *__sem_base; /* pointer to first semaphore in set */ 51 unsigned short sem_nsems; /* number of sems in set */ 52 time_t sem_otime; /* last operation time */ 53 time_t sem_ctime; /* last change time */ 54 /* Times measured in secs since */ 55 /* 00:00:00 UTC, Jan. 1, 1970, without leap seconds */ 56}; 57 58/* 59 * semop's sops parameter structure 60 */ 61struct sembuf { 62 unsigned short sem_num; /* semaphore # */ 63 short sem_op; /* semaphore operation */ 64 short sem_flg; /* operation flags */ 65}; 66#define SEM_UNDO 010000 67 68#if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 69 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) || \ 70 defined(_WANT_SEMUN_OLD) 71union semun_old { 72 int val; /* value for SETVAL */ 73 struct semid_ds_old *buf; /* buffer for IPC_STAT & IPC_SET */ 74 unsigned short *array; /* array for GETALL & SETALL */ 75}; 76#endif 77 78#if defined(_KERNEL) || defined(_WANT_SEMUN) 79/* 80 * semctl's arg parameter structure 81 */ 82union semun { 83 int val; /* value for SETVAL */ 84 struct semid_ds *buf; /* buffer for IPC_STAT & IPC_SET */ 85 unsigned short *array; /* array for GETALL & SETALL */ 86}; 87#endif 88 89/* 90 * commands for semctl 91 */ 92#define GETNCNT 3 /* Return the value of semncnt {READ} */ 93#define GETPID 4 /* Return the value of sempid {READ} */ 94#define GETVAL 5 /* Return the value of semval {READ} */ 95#define GETALL 6 /* Return semvals into arg.array {READ} */ 96#define GETZCNT 7 /* Return the value of semzcnt {READ} */ 97#define SETVAL 8 /* Set the value of semval to arg.val {ALTER} */ 98#define SETALL 9 /* Set semvals from arg.array {ALTER} */ 99#define SEM_STAT 10 /* Like IPC_STAT but treats semid as sema-index */ 100#define SEM_INFO 11 /* Like IPC_INFO but treats semid as sema-index */ 101 102/* 103 * Permissions 104 */ 105#define SEM_A IPC_W /* alter permission */ 106#define SEM_R IPC_R /* read permission */ 107 108#if defined(_KERNEL) || defined(_WANT_SYSVSEM_INTERNALS) 109/* 110 * semaphore info struct 111 */ 112struct seminfo { 113 int semmni; /* # of semaphore identifiers */ 114 int semmns; /* # of semaphores in system */ 115 int semmnu; /* # of undo structures in system */ 116 int semmsl; /* max # of semaphores per id */ 117 int semopm; /* max # of operations per semop call */ 118 int semume; /* max # of undo entries per process */ 119 int semusz; /* size in bytes of undo structure */ 120 int semvmx; /* semaphore maximum value */ 121 int semaem; /* adjust on exit max value */ 122}; 123 124/* 125 * Kernel wrapper for the user-level structure 126 */ 127struct semid_kernel { 128 struct semid_ds u; 129 struct label *label; /* MAC framework label */ 130 struct ucred *cred; /* creator's credentials */ 131}; 132 133/* internal "mode" bits */ 134#define SEM_ALLOC 01000 /* semaphore is allocated */ 135#define SEM_DEST 02000 /* semaphore will be destroyed on last detach */ 136#endif 137 138#ifdef _KERNEL 139extern struct seminfo seminfo; 140/* 141 * Process sem_undo vectors at proc exit. 142 */ 143void semexit(struct proc *p); 144 145int kern_get_sema(struct thread *td, struct semid_kernel **res, 146 size_t *sz); 147 148#else /* !_KERNEL */ 149 150__BEGIN_DECLS 151#if __BSD_VISIBLE 152int semsys(int, ...); 153#endif 154int semctl(int, int, int, ...); 155int semget(key_t, int, int); 156int semop(int, struct sembuf *, size_t); 157__END_DECLS 158 159#endif /* !_KERNEL */ 160 161#endif /* !_SYS_SEM_H_ */ 162