/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */

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#ifndef _LINUX_SEM_H

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#define _LINUX_SEM_H

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#include <linux/ipc.h>

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/* semop flags */

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#define SEM_UNDO 0x1000 /* undo the operation on exit */

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/* semctl Command Definitions. */

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#define GETPID 11 /* get sempid */

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#define GETVAL 12 /* get semval */

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#define GETALL 13 /* get all semval's */

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#define GETNCNT 14 /* get semncnt */

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#define GETZCNT 15 /* get semzcnt */

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#define SETVAL 16 /* set semval */

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#define SETALL 17 /* set all semval's */

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/* ipcs ctl cmds */

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#define SEM_STAT 18

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#define SEM_INFO 19

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#define SEM_STAT_ANY 20

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/* Obsolete, used only for backwards compatibility and libc5 compiles */

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struct semid_ds {

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struct ipc_perm sem_perm; /* permissions .. see ipc.h */

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__kernel_time_t sem_otime; /* last semop time */

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__kernel_time_t sem_ctime; /* create/last semctl() time */

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struct sem *sem_base; /* ptr to first semaphore in array */

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struct sem_queue *sem_pending; /* pending operations to be processed */

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struct sem_queue **sem_pending_last; /* last pending operation */

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struct sem_undo *undo; /* undo requests on this array */

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unsigned short sem_nsems; /* no. of semaphores in array */

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};

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/* Include the definition of semid64_ds */

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#include <asm/sembuf.h>

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/* semop system calls takes an array of these. */

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struct sembuf {

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unsigned short sem_num; /* semaphore index in array */

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short sem_op; /* semaphore operation */

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short sem_flg; /* operation flags */

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};

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/* arg for semctl system calls. */

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union semun {

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int val; /* value for SETVAL */

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struct semid_ds *buf; /* buffer for IPC_STAT & IPC_SET */

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unsigned short *array; /* array for GETALL & SETALL */

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struct seminfo *__buf; /* buffer for IPC_INFO */

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void *__pad;

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};

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struct seminfo {

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int semmap;

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int semmni;

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int semmns;

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int semmnu;

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int semmsl;

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int semopm;

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int semume;

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int semusz;

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int semvmx;

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int semaem;

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};

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/*

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* SEMMNI, SEMMSL and SEMMNS are default values which can be

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* modified by sysctl.

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* The values has been chosen to be larger than necessary for any

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* known configuration.

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*

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* SEMOPM should not be increased beyond 1000, otherwise there is the

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* risk that semop()/semtimedop() fails due to kernel memory fragmentation when

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* allocating the sop array.

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*/

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#define SEMMNI 32000 /* <= IPCMNI max # of semaphore identifiers */

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#define SEMMSL 32000 /* <= INT_MAX max num of semaphores per id */

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#define SEMMNS (SEMMNI*SEMMSL) /* <= INT_MAX max # of semaphores in system */

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#define SEMOPM 500 /* <= 1 000 max num of ops per semop call */

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#define SEMVMX 32767 /* <= 32767 semaphore maximum value */

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#define SEMAEM SEMVMX /* adjust on exit max value */

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/* unused */

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#define SEMUME SEMOPM /* max num of undo entries per process */

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#define SEMMNU SEMMNS /* num of undo structures system wide */

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#define SEMMAP SEMMNS /* # of entries in semaphore map */

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#define SEMUSZ 20 /* sizeof struct sem_undo */

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#endif /* _LINUX_SEM_H */

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