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