1 /* $FreeBSD: src/sys/sys/sem.h,v 1.29 2004/11/17 13:12:06 rwatson Exp $ */
2 /* $NetBSD: sem.h,v 1.5 1994/06/29 06:45:15 cgd Exp $ */
5 *© * © * Portions Copyright (c) 2006 Nokia Corporation and/or its subsidiary(-ies). All rights reserved.
6 * SVID compatible sem.h file
8 * Author: Daniel Boulet
18 u_short semval; /* semaphore value */
19 pid_t sempid; /* process ID of last operation */
20 u_short semncnt; /* number of processes waiting for semval
21 to become greater than current value */
22 u_short semzcnt; /* number of processes waiting for semval
27 struct ipc_perm sem_perm; /* operation permission struct */
28 struct sem *sem_base; /* pointer to first semaphore in set */
29 unsigned short sem_nsems; /* number of sems in set */
30 time_t sem_otime; /* last operation time */
31 long sem_pad1; /* SVABI/386 says I need this here */
32 time_t sem_ctime; /* last change time */
33 /* Times measured in secs since */
34 /* 00:00:00 GMT, Jan. 1, 1970 */
35 long sem_pad2; /* SVABI/386 says I need this here */
36 long sem_pad3[4]; /* SVABI/386 says I need this here */
40 * semop's sops parameter structure
43 unsigned short sem_num; /* semaphore # */
44 short sem_op; /* semaphore operation */
45 short sem_flg; /* operation flags */
47 #define SEM_UNDO 010000
50 * semctl's arg parameter structure
53 int val; /* value for SETVAL */
54 struct semid_ds *buf; /* buffer for IPC_STAT & IPC_SET */
55 unsigned short *array; /* array for GETALL & SETALL */
61 #define GETNCNT 3 /* Return the value of semncnt {READ} */
62 #define GETPID 4 /* Return the value of sempid {READ} */
63 #define GETVAL 5 /* Return the value of semval {READ} */
64 #define GETALL 6 /* Return semvals into arg.array {READ} */
65 #define GETZCNT 7 /* Return the value of semzcnt {READ} */
66 #define SETVAL 8 /* Set the value of semval to arg.val {ALTER} */
67 #define SETALL 9 /* Set semvals from arg.array {ALTER} */
68 #define SEM_STAT 10 /* Like IPC_STAT but treats semid as sema-index */
69 #define SEM_INFO 11 /* Like IPC_INFO but treats semid as sema-index */
74 #define SEM_A IPC_W /* alter permission */
75 #define SEM_R IPC_R /* read permission */
80 * semaphore info struct
83 int semmap, /* # of entries in semaphore map */
84 semmni, /* # of semaphore identifiers */
85 semmns, /* # of semaphores in system */
86 semmnu, /* # of undo structures in system */
87 semmsl, /* max # of semaphores per id */
88 semopm, /* max # of operations per semop call */
89 semume, /* max # of undo entries per process */
90 semusz, /* size in bytes of undo structure */
91 semvmx, /* semaphore maximum value */
92 semaem; /* adjust on exit max value */
94 extern struct seminfo seminfo;
97 * Kernel wrapper for the user-level structure
101 struct label *label; /* MAC framework label */
104 /* internal "mode" bits */
105 #define SEM_ALLOC 01000 /* semaphore is allocated */
106 #define SEM_DEST 02000 /* semaphore will be destroyed on last detach */
109 * Process sem_undo vectors at proc exit.
111 void semexit(struct proc *p);
115 #include <sys/cdefs.h>
116 #include <sys/_types.h>
118 #ifndef _SIZE_T_DECLARED
119 typedef __size_t size_t;
120 #define _SIZE_T_DECLARED
123 #ifndef _PID_T_DECLARED
124 typedef __pid_t pid_t;
125 #define _PID_T_DECLARED
128 // FUNCTION PROTOTYPES
131 // FORWARD DECLARATIONS
134 // CLASS/STRUCT/FUNCTION DECLARATION
139 * Get semaphore identifier using the IPC key generated by ftok.
142 IMPORT_C int semget(key_t key, int nsems, int semflg);
146 * Perform atomically a user-defined array of semaphore operations on the set of
147 * semaphores associated with the semaphore identifier specified by the argument semid.
150 IMPORT_C int semop(int semid, struct sembuf *sops, unsigned nsops);
154 * Provides a variety of semaphore control operations as specified by cmd.
156 IMPORT_C int semctl(int semid, int semnum, int cmd, ...);
160 #endif // #ifndef _KERNEL
162 #endif // _SYS_SEM_H_