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 #include <machine/stdint.h> 16 17 #ifndef _PID_T_DECLARED 18 typedef __pid_t pid_t; 19 #define _PID_T_DECLARED 20 #endif 21 22 #ifndef _SIZE_T_DECLARED 23 typedef __size_t size_t; 24 #define _SIZE_T_DECLARED 25 #endif 26 27 #ifndef _TIME_T_DECLARED 28 typedef __time_t time_t; 29 #define _TIME_T_DECLARED 30 #endif 31 32 struct sem; 33 34 struct semid_ds { 35 struct ipc_perm 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 GMT, Jan. 1, 1970 */ 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 47 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES) 48 49 #include <sys/lock.h> 50 51 struct semid_pool { 52 struct lock lk; 53 struct semid_ds ds; 54 long gen; 55 }; 56 57 #endif 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 __BSD_VISIBLE 70 #define MAX_SOPS 5 /* maximum # of sembuf's per semop call */ 71 72 /* 73 * semctl's arg parameter structure 74 */ 75 union semun { 76 int val; /* value for SETVAL */ 77 struct semid_ds *buf; /* buffer for IPC_STAT & IPC_SET */ 78 unsigned short *array; /* array for GETALL & SETALL */ 79 }; 80 #endif /* __BSD_VISIBLE */ 81 82 /* 83 * commands for semctl 84 */ 85 #define GETNCNT 3 /* Return the value of semncnt {READ} */ 86 #define GETPID 4 /* Return the value of sempid {READ} */ 87 #define GETVAL 5 /* Return the value of semval {READ} */ 88 #define GETALL 6 /* Return semvals into arg.array {READ} */ 89 #define GETZCNT 7 /* Return the value of semzcnt {READ} */ 90 #define SETVAL 8 /* Set the value of semval to arg.val {ALTER} */ 91 #define SETALL 9 /* Set semvals from arg.array {ALTER} */ 92 #if __BSD_VISIBLE 93 #define SEM_STAT 10 /* Like IPC_STAT but treats semid as sema-index */ 94 95 /* 96 * Permissions 97 */ 98 #define SEM_A 0200 /* alter permission */ 99 #define SEM_R 0400 /* read permission */ 100 #endif /* __BSD_VISIBLE */ 101 102 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES) 103 104 /* 105 * semaphore info struct 106 */ 107 struct seminfo { 108 int semmap, /* # of entries in semaphore map */ 109 semmni, /* # of semaphore identifiers */ 110 semmns, /* # of semaphores in system */ 111 semmnu, /* # of undo structures in system */ 112 semmsl, /* max # of semaphores per id */ 113 semopm, /* max # of operations per semop call */ 114 semume, /* max # of undo entries per process */ 115 semusz, /* size in bytes of undo structure */ 116 semvmx, /* semaphore maximum value */ 117 semaem; /* adjust on exit max value */ 118 }; 119 120 /* internal "mode" bits */ 121 #define SEM_ALLOC 01000 /* semaphore is allocated */ 122 #define SEM_DEST 02000 /* semaphore will be destroyed on last detach */ 123 124 #endif /* _KERNEL || _KERNEL_STRUCTURES */ 125 126 #ifdef _KERNEL 127 /* 128 * Process sem_undo vectors at proc exit. 129 */ 130 void semexit(struct proc *p); 131 extern struct seminfo seminfo; 132 #else 133 __BEGIN_DECLS 134 int semctl(int, int, int, ...); 135 int semget(key_t, int, int); 136 int semop(int, struct sembuf *, unsigned); 137 __END_DECLS 138 #endif /* !_KERNEL */ 139 140 #endif /* !_SEM_H_ */ 141