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 #if defined(_KERNEL) || defined(_WANT_SEMUN) 80 /* 81 * semctl's arg parameter structure 82 */ 83 union semun { 84 int val; /* value for SETVAL */ 85 struct semid_ds *buf; /* buffer for IPC_STAT & IPC_SET */ 86 unsigned short *array; /* array for GETALL & SETALL */ 87 }; 88 #endif 89 90 /* 91 * commands for semctl 92 */ 93 #define GETNCNT 3 /* Return the value of semncnt {READ} */ 94 #define GETPID 4 /* Return the value of sempid {READ} */ 95 #define GETVAL 5 /* Return the value of semval {READ} */ 96 #define GETALL 6 /* Return semvals into arg.array {READ} */ 97 #define GETZCNT 7 /* Return the value of semzcnt {READ} */ 98 #define SETVAL 8 /* Set the value of semval to arg.val {ALTER} */ 99 #define SETALL 9 /* Set semvals from arg.array {ALTER} */ 100 #define SEM_STAT 10 /* Like IPC_STAT but treats semid as sema-index */ 101 #define SEM_INFO 11 /* Like IPC_INFO but treats semid as sema-index */ 102 103 /* 104 * Permissions 105 */ 106 #define SEM_A IPC_W /* alter permission */ 107 #define SEM_R IPC_R /* read permission */ 108 109 #if defined(_KERNEL) || defined(_WANT_SYSVSEM_INTERNALS) 110 /* 111 * semaphore info struct 112 */ 113 struct seminfo { 114 int semmni; /* # of semaphore identifiers */ 115 int semmns; /* # of semaphores in system */ 116 int semmnu; /* # of undo structures in system */ 117 int semmsl; /* max # of semaphores per id */ 118 int semopm; /* max # of operations per semop call */ 119 int semume; /* max # of undo entries per process */ 120 int semusz; /* size in bytes of undo structure */ 121 int semvmx; /* semaphore maximum value */ 122 int semaem; /* adjust on exit max value */ 123 }; 124 125 /* 126 * Kernel wrapper for the user-level structure 127 */ 128 struct semid_kernel { 129 struct semid_ds u; 130 struct label *label; /* MAC framework label */ 131 struct ucred *cred; /* creator's credentials */ 132 }; 133 134 /* internal "mode" bits */ 135 #define SEM_ALLOC 01000 /* semaphore is allocated */ 136 #define SEM_DEST 02000 /* semaphore will be destroyed on last detach */ 137 #endif 138 139 #ifdef _KERNEL 140 extern struct seminfo seminfo; 141 /* 142 * Process sem_undo vectors at proc exit. 143 */ 144 void semexit(struct proc *p); 145 146 #else /* !_KERNEL */ 147 148 __BEGIN_DECLS 149 #if __BSD_VISIBLE 150 int semsys(int, ...); 151 #endif 152 int semctl(int, int, int, ...); 153 int semget(key_t, int, int); 154 int semop(int, struct sembuf *, size_t); 155 __END_DECLS 156 157 #endif /* !_KERNEL */ 158 159 #endif /* !_SYS_SEM_H_ */ 160