sem.h (3094B)
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 */