1 /* $FreeBSD: src/sys/sys/sem.h,v 1.20.2.2 2000/08/04 22:31:10 peter Exp $ */ 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 #include <sys/cdefs.h> 14 #include <sys/ipc.h> 15 16 #ifndef _PID_T_DECLARED 17 typedef __pid_t pid_t; 18 #define _PID_T_DECLARED 19 #endif 20 21 #ifndef _SIZE_T_DECLARED 22 typedef __size_t size_t; 23 #define _SIZE_T_DECLARED 24 #endif 25 26 #ifndef _TIME_T_DECLARED 27 typedef __time_t time_t; 28 #define _TIME_T_DECLARED 29 #endif 30 31 struct sem; 32 33 struct semid_ds { 34 struct ipc_perm sem_perm; /* operation permission struct */ 35 struct sem *sem_base; /* pointer to first semaphore in set */ 36 unsigned short sem_nsems; /* number of sems in set */ 37 time_t sem_otime; /* last operation time */ 38 long sem_pad1; /* SVABI/386 says I need this here */ 39 time_t sem_ctime; /* last change time */ 40 /* Times measured in secs since */ 41 /* 00:00:00 GMT, Jan. 1, 1970 */ 42 long sem_pad2; /* SVABI/386 says I need this here */ 43 long sem_pad3[4]; /* SVABI/386 says I need this here */ 44 }; 45 46 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES) 47 48 #include <sys/lock.h> 49 50 struct semid_pool { 51 struct lock lk; 52 struct semid_ds ds; 53 long gen; 54 }; 55 56 #endif 57 58 /* 59 * semop's sops parameter structure 60 */ 61 struct 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 __BSD_VISIBLE 69 #define MAX_SOPS 5 /* maximum # of sembuf's per semop call */ 70 71 /* 72 * semctl's arg parameter structure 73 */ 74 union semun { 75 int val; /* value for SETVAL */ 76 struct semid_ds *buf; /* buffer for IPC_STAT & IPC_SET */ 77 u_short *array; /* array for GETALL & SETALL */ 78 }; 79 #endif /* __BSD_VISIBLE */ 80 81 /* 82 * commands for semctl 83 */ 84 #define GETNCNT 3 /* Return the value of semncnt {READ} */ 85 #define GETPID 4 /* Return the value of sempid {READ} */ 86 #define GETVAL 5 /* Return the value of semval {READ} */ 87 #define GETALL 6 /* Return semvals into arg.array {READ} */ 88 #define GETZCNT 7 /* Return the value of semzcnt {READ} */ 89 #define SETVAL 8 /* Set the value of semval to arg.val {ALTER} */ 90 #define SETALL 9 /* Set semvals from arg.array {ALTER} */ 91 #if __BSD_VISIBLE 92 #define SEM_STAT 10 /* Like IPC_STAT but treats semid as sema-index */ 93 94 /* 95 * Permissions 96 */ 97 #define SEM_A 0200 /* alter permission */ 98 #define SEM_R 0400 /* read permission */ 99 #endif /* __BSD_VISIBLE */ 100 101 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES) 102 103 /* 104 * semaphore info struct 105 */ 106 struct seminfo { 107 int semmap, /* # of entries in semaphore map */ 108 semmni, /* # of semaphore identifiers */ 109 semmns, /* # of semaphores in system */ 110 semmnu, /* # of undo structures in system */ 111 semmsl, /* max # of semaphores per id */ 112 semopm, /* max # of operations per semop call */ 113 semume, /* max # of undo entries per process */ 114 semusz, /* size in bytes of undo structure */ 115 semvmx, /* semaphore maximum value */ 116 semaem; /* adjust on exit max value */ 117 }; 118 119 /* internal "mode" bits */ 120 #define SEM_ALLOC 01000 /* semaphore is allocated */ 121 #define SEM_DEST 02000 /* semaphore will be destroyed on last detach */ 122 123 #endif /* _KERNEL || _KERNEL_STRUCTURES */ 124 125 #ifdef _KERNEL 126 /* 127 * Process sem_undo vectors at proc exit. 128 */ 129 void semexit(struct proc *p); 130 extern struct seminfo seminfo; 131 #else 132 __BEGIN_DECLS 133 int semctl(int, int, int, ...); 134 int semget(key_t, int, int); 135 int semop(int, struct sembuf *, unsigned); 136 __END_DECLS 137 #endif /* !_KERNEL */ 138 139 #endif /* !_SEM_H_ */ 140