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94 lines
3.0 KiB
94 lines
3.0 KiB
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ |
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#ifndef _UAPI_LINUX_SEM_H |
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#define _UAPI_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_old_time_t sem_otime; /* last semop time */ |
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__kernel_old_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 __user *buf; /* buffer for IPC_STAT & IPC_SET */ |
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unsigned short __user *array; /* array for GETALL & SETALL */ |
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struct seminfo __user *__buf; /* buffer for IPC_INFO */ |
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void __user *__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 /* _UAPI_LINUX_SEM_H */
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