1/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
2#ifndef _UAPI_LINUX_SEM_H
3#define _UAPI_LINUX_SEM_H
4
5#include <linux/ipc.h>
6
7/* semop flags */
8#define SEM_UNDO        0x1000  /* undo the operation on exit */
9
10/* semctl Command Definitions. */
11#define GETPID  11       /* get sempid */
12#define GETVAL  12       /* get semval */
13#define GETALL  13       /* get all semval's */
14#define GETNCNT 14       /* get semncnt */
15#define GETZCNT 15       /* get semzcnt */
16#define SETVAL  16       /* set semval */
17#define SETALL  17       /* set all semval's */
18
19/* ipcs ctl cmds */
20#define SEM_STAT 18
21#define SEM_INFO 19
22#define SEM_STAT_ANY 20
23
24/* Obsolete, used only for backwards compatibility and libc5 compiles */
25struct semid_ds {
26	struct ipc_perm	sem_perm;		/* permissions .. see ipc.h */
27	__kernel_old_time_t sem_otime;		/* last semop time */
28	__kernel_old_time_t sem_ctime;		/* create/last semctl() time */
29	struct sem	*sem_base;		/* ptr to first semaphore in array */
30	struct sem_queue *sem_pending;		/* pending operations to be processed */
31	struct sem_queue **sem_pending_last;	/* last pending operation */
32	struct sem_undo	*undo;			/* undo requests on this array */
33	unsigned short	sem_nsems;		/* no. of semaphores in array */
34};
35
36/* Include the definition of semid64_ds */
37#include <asm/sembuf.h>
38
39/* semop system calls takes an array of these. */
40struct sembuf {
41	unsigned short  sem_num;	/* semaphore index in array */
42	short		sem_op;		/* semaphore operation */
43	short		sem_flg;	/* operation flags */
44};
45
46/* arg for semctl system calls. */
47union semun {
48	int val;			/* value for SETVAL */
49	struct semid_ds __user *buf;	/* buffer for IPC_STAT & IPC_SET */
50	unsigned short __user *array;	/* array for GETALL & SETALL */
51	struct seminfo __user *__buf;	/* buffer for IPC_INFO */
52	void __user *__pad;
53};
54
55struct  seminfo {
56	int semmap;
57	int semmni;
58	int semmns;
59	int semmnu;
60	int semmsl;
61	int semopm;
62	int semume;
63	int semusz;
64	int semvmx;
65	int semaem;
66};
67
68/*
69 * SEMMNI, SEMMSL and SEMMNS are default values which can be
70 * modified by sysctl.
71 * The values has been chosen to be larger than necessary for any
72 * known configuration.
73 *
74 * SEMOPM should not be increased beyond 1000, otherwise there is the
75 * risk that semop()/semtimedop() fails due to kernel memory fragmentation when
76 * allocating the sop array.
77 */
78
79
80#define SEMMNI  32000           /* <= IPCMNI  max # of semaphore identifiers */
81#define SEMMSL  32000           /* <= INT_MAX max num of semaphores per id */
82#define SEMMNS  (SEMMNI*SEMMSL) /* <= INT_MAX max # of semaphores in system */
83#define SEMOPM  500	        /* <= 1 000 max num of ops per semop call */
84#define SEMVMX  32767           /* <= 32767 semaphore maximum value */
85#define SEMAEM  SEMVMX          /* adjust on exit max value */
86
87/* unused */
88#define SEMUME  SEMOPM          /* max num of undo entries per process */
89#define SEMMNU  SEMMNS          /* num of undo structures system wide */
90#define SEMMAP  SEMMNS          /* # of entries in semaphore map */
91#define SEMUSZ  20		/* sizeof struct sem_undo */
92
93
94#endif /* _UAPI_LINUX_SEM_H */
95