95 lines · c
1/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */2#ifndef _UAPI_LINUX_SEM_H3#define _UAPI_LINUX_SEM_H4 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 1821#define SEM_INFO 1922#define SEM_STAT_ANY 2023 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 be70 * modified by sysctl.71 * The values has been chosen to be larger than necessary for any72 * known configuration.73 *74 * SEMOPM should not be increased beyond 1000, otherwise there is the75 * risk that semop()/semtimedop() fails due to kernel memory fragmentation when76 * 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