1#ifndef _UAPI_LINUX_SEM_H
2#define _UAPI_LINUX_SEM_H
3
4#include <linux/ipc.h>
5
6/* semop flags */
7#define SEM_UNDO        0x1000  /* undo the operation on exit */
8
9/* semctl Command Definitions. */
10#define GETPID  11       /* get sempid */
11#define GETVAL  12       /* get semval */
12#define GETALL  13       /* get all semval's */
13#define GETNCNT 14       /* get semncnt */
14#define GETZCNT 15       /* get semzcnt */
15#define SETVAL  16       /* set semval */
16#define SETALL  17       /* set all semval's */
17
18/* ipcs ctl cmds */
19#define SEM_STAT 18
20#define SEM_INFO 19
21
22/* Obsolete, used only for backwards compatibility and libc5 compiles */
23struct semid_ds {
24	struct ipc_perm	sem_perm;		/* permissions .. see ipc.h */
25	__kernel_time_t	sem_otime;		/* last semop time */
26	__kernel_time_t	sem_ctime;		/* last change time */
27	struct sem	*sem_base;		/* ptr to first semaphore in array */
28	struct sem_queue *sem_pending;		/* pending operations to be processed */
29	struct sem_queue **sem_pending_last;	/* last pending operation */
30	struct sem_undo	*undo;			/* undo requests on this array */
31	unsigned short	sem_nsems;		/* no. of semaphores in array */
32};
33
34/* Include the definition of semid64_ds */
35#include <asm/sembuf.h>
36
37/* semop system calls takes an array of these. */
38struct sembuf {
39	unsigned short  sem_num;	/* semaphore index in array */
40	short		sem_op;		/* semaphore operation */
41	short		sem_flg;	/* operation flags */
42};
43
44/* arg for semctl system calls. */
45union semun {
46	int val;			/* value for SETVAL */
47	struct semid_ds __user *buf;	/* buffer for IPC_STAT & IPC_SET */
48	unsigned short __user *array;	/* array for GETALL & SETALL */
49	struct seminfo __user *__buf;	/* buffer for IPC_INFO */
50	void __user *__pad;
51};
52
53struct  seminfo {
54	int semmap;
55	int semmni;
56	int semmns;
57	int semmnu;
58	int semmsl;
59	int semopm;
60	int semume;
61	int semusz;
62	int semvmx;
63	int semaem;
64};
65
66/*
67 * SEMMNI, SEMMSL and SEMMNS are default values which can be
68 * modified by sysctl.
69 * The values has been chosen to be larger than necessary for any
70 * known configuration.
71 *
72 * SEMOPM should not be increased beyond 1000, otherwise there is the
73 * risk that semop()/semtimedop() fails due to kernel memory fragmentation when
74 * allocating the sop array.
75 */
76
77
78#define SEMMNI  32000           /* <= IPCMNI  max # of semaphore identifiers */
79#define SEMMSL  32000           /* <= INT_MAX max num of semaphores per id */
80#define SEMMNS  (SEMMNI*SEMMSL) /* <= INT_MAX max # of semaphores in system */
81#define SEMOPM  500	        /* <= 1 000 max num of ops per semop call */
82#define SEMVMX  32767           /* <= 32767 semaphore maximum value */
83#define SEMAEM  SEMVMX          /* adjust on exit max value */
84
85/* unused */
86#define SEMUME  SEMOPM          /* max num of undo entries per process */
87#define SEMMNU  SEMMNS          /* num of undo structures system wide */
88#define SEMMAP  SEMMNS          /* # of entries in semaphore map */
89#define SEMUSZ  20		/* sizeof struct sem_undo */
90
91
92#endif /* _UAPI_LINUX_SEM_H */
93