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 $ */
6 * SVID compatible sem.h file
8 * Author: Daniel Boulet
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 */
31 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
44 * semop's sops parameter structure
47 u_short sem_num; /* semaphore # */
48 short sem_op; /* semaphore operation */
49 short sem_flg; /* operation flags */
51 #define SEM_UNDO 010000
53 #define MAX_SOPS 5 /* maximum # of sembuf's per semop call */
56 * semctl's arg parameter structure
59 int val; /* value for SETVAL */
60 struct semid_ds *buf; /* buffer for IPC_STAT & IPC_SET */
61 u_short *array; /* array for GETALL & SETALL */
67 #define GETNCNT 3 /* Return the value of semncnt {READ} */
68 #define GETPID 4 /* Return the value of sempid {READ} */
69 #define GETVAL 5 /* Return the value of semval {READ} */
70 #define GETALL 6 /* Return semvals into arg.array {READ} */
71 #define GETZCNT 7 /* Return the value of semzcnt {READ} */
72 #define SETVAL 8 /* Set the value of semval to arg.val {ALTER} */
73 #define SETALL 9 /* Set semvals from arg.array {ALTER} */
74 #define SEM_STAT 10 /* Like IPC_STAT but treats semid as sema-index */
79 #define SEM_A 0200 /* alter permission */
80 #define SEM_R 0400 /* read permission */
82 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
85 * semaphore info struct
88 int semmap, /* # of entries in semaphore map */
89 semmni, /* # of semaphore identifiers */
90 semmns, /* # of semaphores in system */
91 semmnu, /* # of undo structures in system */
92 semmsl, /* max # of semaphores per id */
93 semopm, /* max # of operations per semop call */
94 semume, /* max # of undo entries per process */
95 semusz, /* size in bytes of undo structure */
96 semvmx, /* semaphore maximum value */
97 semaem; /* adjust on exit max value */
100 /* internal "mode" bits */
101 #define SEM_ALLOC 01000 /* semaphore is allocated */
102 #define SEM_DEST 02000 /* semaphore will be destroyed on last detach */
104 #endif /* _KERNEL || _KERNEL_STRUCTURES */
109 * Process sem_undo vectors at proc exit.
111 void semexit (struct proc *p);
112 extern struct seminfo seminfo;
117 #include <sys/cdefs.h>
120 int semsys (int, ...);
121 int semctl (int, int, int, ...);
122 int semget (key_t, int, int);
123 int semop (int, struct sembuf *,unsigned);
125 #endif /* !_KERNEL */
127 #endif /* !_SEM_H_ */