1 /* $FreeBSD$ */ 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 19 typedef __pid_t pid_t; 20 #define _PID_T_DECLARED 21 #endif 22 23 #ifndef _SIZE_T_DECLARED 24 typedef __size_t size_t; 25 #define _SIZE_T_DECLARED 26 #endif 27 28 #ifndef _TIME_T_DECLARED 29 typedef __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) 35 struct 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 49 struct 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 */ 62 struct 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) 72 union 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 */ 82 union 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 */ 111 struct seminfo { 112 int semmni; /* # of semaphore identifiers */ 113 int semmns; /* # of semaphores in system */ 114 int semmnu; /* # of undo structures in system */ 115 int semmsl; /* max # of semaphores per id */ 116 int semopm; /* max # of operations per semop call */ 117 int semume; /* max # of undo entries per process */ 118 int semusz; /* size in bytes of undo structure */ 119 int semvmx; /* semaphore maximum value */ 120 int semaem; /* adjust on exit max value */ 121 }; 122 123 /* 124 * Kernel wrapper for the user-level structure 125 */ 126 struct 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 138 extern struct seminfo seminfo; 139 /* 140 * Process sem_undo vectors at proc exit. 141 */ 142 void semexit(struct proc *p); 143 144 #else /* !_KERNEL */ 145 146 __BEGIN_DECLS 147 #if __BSD_VISIBLE 148 int semsys(int, ...); 149 #endif 150 int semctl(int, int, int, ...); 151 int semget(key_t, int, int); 152 int semop(int, struct sembuf *, size_t); 153 __END_DECLS 154 155 #endif /* !_KERNEL */ 156 157 #endif /* !_SYS_SEM_H_ */ 158