1 /* $FreeBSD: src/sys/sys/sem.h,v 1.20.2.2 2000/08/04 22:31:10 peter Exp $ */ 2 /* $DragonFly: src/sys/sys/sem.h,v 1.4 2003/08/27 02:03:22 dillon Exp $ */ 3 /* $NetBSD: sem.h,v 1.5 1994/06/29 06:45:15 cgd Exp $ */ 4 5 /* 6 * SVID compatible sem.h file 7 * 8 * Author: Daniel Boulet 9 */ 10 11 #ifndef _SYS_SEM_H_ 12 #define _SYS_SEM_H_ 13 14 #include <sys/ipc.h> 15 16 struct sem; 17 18 struct semid_ds { 19 struct ipc_perm sem_perm; /* operation permission struct */ 20 struct sem *sem_base; /* pointer to first semaphore in set */ 21 u_short sem_nsems; /* number of sems in set */ 22 time_t sem_otime; /* last operation time */ 23 long sem_pad1; /* SVABI/386 says I need this here */ 24 time_t sem_ctime; /* last change time */ 25 /* Times measured in secs since */ 26 /* 00:00:00 GMT, Jan. 1, 1970 */ 27 long sem_pad2; /* SVABI/386 says I need this here */ 28 long sem_pad3[4]; /* SVABI/386 says I need this here */ 29 }; 30 31 /* 32 * semop's sops parameter structure 33 */ 34 struct sembuf { 35 u_short sem_num; /* semaphore # */ 36 short sem_op; /* semaphore operation */ 37 short sem_flg; /* operation flags */ 38 }; 39 #define SEM_UNDO 010000 40 41 #define MAX_SOPS 5 /* maximum # of sembuf's per semop call */ 42 43 /* 44 * semctl's arg parameter structure 45 */ 46 union semun { 47 int val; /* value for SETVAL */ 48 struct semid_ds *buf; /* buffer for IPC_STAT & IPC_SET */ 49 u_short *array; /* array for GETALL & SETALL */ 50 }; 51 52 /* 53 * commands for semctl 54 */ 55 #define GETNCNT 3 /* Return the value of semncnt {READ} */ 56 #define GETPID 4 /* Return the value of sempid {READ} */ 57 #define GETVAL 5 /* Return the value of semval {READ} */ 58 #define GETALL 6 /* Return semvals into arg.array {READ} */ 59 #define GETZCNT 7 /* Return the value of semzcnt {READ} */ 60 #define SETVAL 8 /* Set the value of semval to arg.val {ALTER} */ 61 #define SETALL 9 /* Set semvals from arg.array {ALTER} */ 62 63 /* 64 * Permissions 65 */ 66 #define SEM_A 0200 /* alter permission */ 67 #define SEM_R 0400 /* read permission */ 68 69 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES) 70 71 /* 72 * semaphore info struct 73 */ 74 struct seminfo { 75 int semmap, /* # of entries in semaphore map */ 76 semmni, /* # of semaphore identifiers */ 77 semmns, /* # of semaphores in system */ 78 semmnu, /* # of undo structures in system */ 79 semmsl, /* max # of semaphores per id */ 80 semopm, /* max # of operations per semop call */ 81 semume, /* max # of undo entries per process */ 82 semusz, /* size in bytes of undo structure */ 83 semvmx, /* semaphore maximum value */ 84 semaem; /* adjust on exit max value */ 85 }; 86 87 /* internal "mode" bits */ 88 #define SEM_ALLOC 01000 /* semaphore is allocated */ 89 #define SEM_DEST 02000 /* semaphore will be destroyed on last detach */ 90 91 #endif /* _KERNEL || _KERNEL_STRUCTURES */ 92 93 #ifdef _KERNEL 94 95 /* 96 * Process sem_undo vectors at proc exit. 97 */ 98 void semexit (struct proc *p); 99 extern struct seminfo seminfo; 100 101 #endif 102 103 #ifndef _KERNEL 104 #include <sys/cdefs.h> 105 106 __BEGIN_DECLS 107 int semsys (int, ...); 108 int semctl (int, int, int, ...); 109 int semget (key_t, int, int); 110 int semop (int, struct sembuf *,unsigned); 111 __END_DECLS 112 #endif /* !_KERNEL */ 113 114 #endif /* !_SEM_H_ */ 115