2 /* $NetBSD: sem.h,v 1.5 1994/06/29 06:45:15 cgd Exp $ */
5 * SVID compatible sem.h file
7 * Author: Daniel Boulet
15 #ifndef _PID_T_DECLARED
16 typedef __pid_t pid_t;
17 #define _PID_T_DECLARED
20 #ifndef _SIZE_T_DECLARED
21 typedef __size_t size_t;
22 #define _SIZE_T_DECLARED
25 #ifndef _TIME_T_DECLARED
26 typedef __time_t time_t;
27 #define _TIME_T_DECLARED
31 struct ipc_perm sem_perm; /* operation permission struct */
32 struct sem *sem_base; /* pointer to first semaphore in set */
33 unsigned short sem_nsems; /* number of sems in set */
34 time_t sem_otime; /* last operation time */
35 long sem_pad1; /* SVABI/386 says I need this here */
36 time_t sem_ctime; /* last change time */
37 /* Times measured in secs since */
38 /* 00:00:00 GMT, Jan. 1, 1970 */
39 long sem_pad2; /* SVABI/386 says I need this here */
40 long sem_pad3[4]; /* SVABI/386 says I need this here */
44 * semop's sops parameter structure
47 unsigned short sem_num; /* semaphore # */
48 short sem_op; /* semaphore operation */
49 short sem_flg; /* operation flags */
51 #define SEM_UNDO 010000
54 * semctl's arg parameter structure
57 int val; /* value for SETVAL */
58 struct semid_ds *buf; /* buffer for IPC_STAT & IPC_SET */
59 unsigned short *array; /* array for GETALL & SETALL */
65 #define GETNCNT 3 /* Return the value of semncnt {READ} */
66 #define GETPID 4 /* Return the value of sempid {READ} */
67 #define GETVAL 5 /* Return the value of semval {READ} */
68 #define GETALL 6 /* Return semvals into arg.array {READ} */
69 #define GETZCNT 7 /* Return the value of semzcnt {READ} */
70 #define SETVAL 8 /* Set the value of semval to arg.val {ALTER} */
71 #define SETALL 9 /* Set semvals from arg.array {ALTER} */
72 #define SEM_STAT 10 /* Like IPC_STAT but treats semid as sema-index */
73 #define SEM_INFO 11 /* Like IPC_INFO but treats semid as sema-index */
78 #define SEM_A IPC_W /* alter permission */
79 #define SEM_R IPC_R /* read permission */
84 * semaphore info struct
87 int semmap, /* # of entries in semaphore map */
88 semmni, /* # of semaphore identifiers */
89 semmns, /* # of semaphores in system */
90 semmnu, /* # of undo structures in system */
91 semmsl, /* max # of semaphores per id */
92 semopm, /* max # of operations per semop call */
93 semume, /* max # of undo entries per process */
94 semusz, /* size in bytes of undo structure */
95 semvmx, /* semaphore maximum value */
96 semaem; /* adjust on exit max value */
98 extern struct seminfo seminfo;
101 * Kernel wrapper for the user-level structure
103 struct semid_kernel {
105 struct label *label; /* MAC framework label */
108 /* internal "mode" bits */
109 #define SEM_ALLOC 01000 /* semaphore is allocated */
110 #define SEM_DEST 02000 /* semaphore will be destroyed on last detach */
113 * Process sem_undo vectors at proc exit.
115 void semexit(struct proc *p);
117 #else /* ! _KERNEL */
120 int semsys(int, ...);
121 int semctl(int, int, int, ...);
122 int semget(key_t, int, int);
123 int semop(int, struct sembuf *, size_t);
126 #endif /* !_KERNEL */
128 #endif /* !_SYS_SEM_H_ */