| /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ |
| #ifndef _UAPI_LINUX_SEM_H |
| #define _UAPI_LINUX_SEM_H |
| |
| #include <linux/ipc.h> |
| |
| /* semop flags */ |
| #define SEM_UNDO 0x1000 /* undo the operation on exit */ |
| |
| /* semctl Command Definitions. */ |
| #define GETPID 11 /* get sempid */ |
| #define GETVAL 12 /* get semval */ |
| #define GETALL 13 /* get all semval's */ |
| #define GETNCNT 14 /* get semncnt */ |
| #define GETZCNT 15 /* get semzcnt */ |
| #define SETVAL 16 /* set semval */ |
| #define SETALL 17 /* set all semval's */ |
| |
| /* ipcs ctl cmds */ |
| #define SEM_STAT 18 |
| #define SEM_INFO 19 |
| #define SEM_STAT_ANY 20 |
| |
| /* Obsolete, used only for backwards compatibility and libc5 compiles */ |
| struct semid_ds { |
| struct ipc_perm sem_perm; /* permissions .. see ipc.h */ |
| __kernel_old_time_t sem_otime; /* last semop time */ |
| __kernel_old_time_t sem_ctime; /* create/last semctl() time */ |
| struct sem *sem_base; /* ptr to first semaphore in array */ |
| struct sem_queue *sem_pending; /* pending operations to be processed */ |
| struct sem_queue **sem_pending_last; /* last pending operation */ |
| struct sem_undo *undo; /* undo requests on this array */ |
| unsigned short sem_nsems; /* no. of semaphores in array */ |
| }; |
| |
| /* Include the definition of semid64_ds */ |
| #include <asm/sembuf.h> |
| |
| /* semop system calls takes an array of these. */ |
| struct sembuf { |
| unsigned short sem_num; /* semaphore index in array */ |
| short sem_op; /* semaphore operation */ |
| short sem_flg; /* operation flags */ |
| }; |
| |
| /* arg for semctl system calls. */ |
| union semun { |
| int val; /* value for SETVAL */ |
| struct semid_ds __user *buf; /* buffer for IPC_STAT & IPC_SET */ |
| unsigned short __user *array; /* array for GETALL & SETALL */ |
| struct seminfo __user *__buf; /* buffer for IPC_INFO */ |
| void __user *__pad; |
| }; |
| |
| struct seminfo { |
| int semmap; |
| int semmni; |
| int semmns; |
| int semmnu; |
| int semmsl; |
| int semopm; |
| int semume; |
| int semusz; |
| int semvmx; |
| int semaem; |
| }; |
| |
| /* |
| * SEMMNI, SEMMSL and SEMMNS are default values which can be |
| * modified by sysctl. |
| * The values has been chosen to be larger than necessary for any |
| * known configuration. |
| * |
| * SEMOPM should not be increased beyond 1000, otherwise there is the |
| * risk that semop()/semtimedop() fails due to kernel memory fragmentation when |
| * allocating the sop array. |
| */ |
| |
| |
| #define SEMMNI 32000 /* <= IPCMNI max # of semaphore identifiers */ |
| #define SEMMSL 32000 /* <= INT_MAX max num of semaphores per id */ |
| #define SEMMNS (SEMMNI*SEMMSL) /* <= INT_MAX max # of semaphores in system */ |
| #define SEMOPM 500 /* <= 1 000 max num of ops per semop call */ |
| #define SEMVMX 32767 /* <= 32767 semaphore maximum value */ |
| #define SEMAEM SEMVMX /* adjust on exit max value */ |
| |
| /* unused */ |
| #define SEMUME SEMOPM /* max num of undo entries per process */ |
| #define SEMMNU SEMMNS /* num of undo structures system wide */ |
| #define SEMMAP SEMMNS /* # of entries in semaphore map */ |
| #define SEMUSZ 20 /* sizeof struct sem_undo */ |
| |
| |
| #endif /* _UAPI_LINUX_SEM_H */ |