1/* $FreeBSD: stable/11/sys/sys/sem.h 347995 2019-05-20 16:31:45Z kib $ */ 2/* $NetBSD: sem.h,v 1.5 1994/06/29 06:45:15 cgd Exp $ */ 3 4/* 5 * SVID compatible sem.h file 6 * 7 * Author: Daniel Boulet 8 */ 9 10#ifndef _SYS_SEM_H_ 11#define _SYS_SEM_H_ 12 13#ifdef _WANT_SYSVSEM_INTERNALS 14#define _WANT_SYSVIPC_INTERNALS 15#endif 16#include <sys/ipc.h> 17 18#ifndef _PID_T_DECLARED 19typedef __pid_t pid_t; 20#define _PID_T_DECLARED 21#endif 22 23#ifndef _SIZE_T_DECLARED 24typedef __size_t size_t; 25#define _SIZE_T_DECLARED 26#endif 27 28#ifndef _TIME_T_DECLARED 29typedef __time_t time_t; 30#define _TIME_T_DECLARED 31#endif 32 33#if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 34 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) 35struct semid_ds_old { 36 struct ipc_perm_old sem_perm; /* operation permission struct */ 37 struct sem *sem_base; /* pointer to first semaphore in set */ 38 unsigned short sem_nsems; /* number of sems in set */ 39 time_t sem_otime; /* last operation time */ 40 long sem_pad1; /* SVABI/386 says I need this here */ 41 time_t sem_ctime; /* last change time */ 42 /* Times measured in secs since */ 43 /* 00:00:00 UTC, Jan. 1, 1970, without leap seconds */ 44 long sem_pad2; /* SVABI/386 says I need this here */ 45 long sem_pad3[4]; /* SVABI/386 says I need this here */ 46}; 47#endif 48 49struct semid_ds { 50 struct ipc_perm sem_perm; /* operation permission struct */ 51 struct sem *sem_base; /* pointer to first semaphore in set */ 52 unsigned short sem_nsems; /* number of sems in set */ 53 time_t sem_otime; /* last operation time */ 54 time_t sem_ctime; /* last change time */ 55 /* Times measured in secs since */ 56 /* 00:00:00 UTC, Jan. 1, 1970, without leap seconds */ 57}; 58 59/* 60 * semop's sops parameter structure 61 */ 62struct sembuf { 63 unsigned short sem_num; /* semaphore # */ 64 short sem_op; /* semaphore operation */ 65 short sem_flg; /* operation flags */ 66}; 67#define SEM_UNDO 010000 68 69#if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 70 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) || \ 71 defined(_WANT_SEMUN_OLD) 72union semun_old { 73 int val; /* value for SETVAL */ 74 struct semid_ds_old *buf; /* buffer for IPC_STAT & IPC_SET */ 75 unsigned short *array; /* array for GETALL & SETALL */ 76}; 77#endif 78 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 88/* 89 * commands for semctl 90 */ 91#define GETNCNT 3 /* Return the value of semncnt {READ} */ 92#define GETPID 4 /* Return the value of sempid {READ} */ 93#define GETVAL 5 /* Return the value of semval {READ} */ 94#define GETALL 6 /* Return semvals into arg.array {READ} */ 95#define GETZCNT 7 /* Return the value of semzcnt {READ} */ 96#define SETVAL 8 /* Set the value of semval to arg.val {ALTER} */ 97#define SETALL 9 /* Set semvals from arg.array {ALTER} */ 98#define SEM_STAT 10 /* Like IPC_STAT but treats semid as sema-index */ 99#define SEM_INFO 11 /* Like IPC_INFO but treats semid as sema-index */ 100 101/* 102 * Permissions 103 */ 104#define SEM_A IPC_W /* alter permission */ 105#define SEM_R IPC_R /* read permission */ 106 107#if defined(_KERNEL) || defined(_WANT_SYSVSEM_INTERNALS) 108/* 109 * semaphore info struct 110 */ 111struct seminfo { 112 int semmni, /* # of semaphore identifiers */ 113 semmns, /* # of semaphores in system */ 114 semmnu, /* # of undo structures in system */ 115 semmsl, /* max # of semaphores per id */ 116 semopm, /* max # of operations per semop call */ 117 semume, /* max # of undo entries per process */ 118 semusz, /* size in bytes of undo structure */ 119 semvmx, /* semaphore maximum value */ 120 semaem; /* adjust on exit max value */ 121}; 122 123/* 124 * Kernel wrapper for the user-level structure 125 */ 126struct semid_kernel { 127 struct semid_ds u; 128 struct label *label; /* MAC framework label */ 129 struct ucred *cred; /* creator's credentials */ 130}; 131 132/* internal "mode" bits */ 133#define SEM_ALLOC 01000 /* semaphore is allocated */ 134#define SEM_DEST 02000 /* semaphore will be destroyed on last detach */ 135#endif 136 137#ifdef _KERNEL 138extern struct seminfo seminfo; 139/* 140 * Process sem_undo vectors at proc exit. 141 */ 142void semexit(struct proc *p); 143 144#else /* !_KERNEL */ 145 146__BEGIN_DECLS 147#if __BSD_VISIBLE 148int semsys(int, ...); 149#endif 150int semctl(int, int, int, ...); 151int semget(key_t, int, int); 152int semop(int, struct sembuf *, size_t); 153__END_DECLS 154 155#endif /* !_KERNEL */ 156 157#endif /* !_SYS_SEM_H_ */ 158