| 1 | #ifndef _LINUX_SEM_H |
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| 2 | #define _LINUX_SEM_H |
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| 3 | |
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| 4 | #include <linux/ipc.h> |
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| 5 | #include <asm/posix_types.h> |
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| 6 | |
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| 7 | /* semop flags */ |
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| 8 | #define SEM_UNDO 0x1000 /* undo the operation on exit */ |
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| 9 | |
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| 10 | /* semctl Command Definitions. */ |
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| 11 | #define GETPID 11 /* get sempid */ |
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| 12 | #define GETVAL 12 /* get semval */ |
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| 13 | #define GETALL 13 /* get all semval's */ |
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| 14 | #define GETNCNT 14 /* get semncnt */ |
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| 15 | #define GETZCNT 15 /* get semzcnt */ |
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| 16 | #define SETVAL 16 /* set semval */ |
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| 17 | #define SETALL 17 /* set all semval's */ |
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| 18 | |
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| 19 | /* ipcs ctl cmds */ |
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| 20 | #define SEM_STAT 18 |
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| 21 | #define SEM_INFO 19 |
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| 22 | |
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| 23 | /* Obsolete, used only for backwards compatibility and libc5 compiles */ |
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| 24 | struct semid_ds { |
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| 25 | struct ipc_perm sem_perm; /* permissions .. see ipc.h */ |
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| 26 | __kernel_time_t sem_otime; /* last semop time */ |
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| 27 | __kernel_time_t sem_ctime; /* last change time */ |
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| 28 | struct sem *sem_base; /* ptr to first semaphore in array */ |
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| 29 | struct sem_queue *sem_pending; /* pending operations to be processed */ |
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| 30 | struct sem_queue **sem_pending_last; /* last pending operation */ |
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| 31 | struct sem_undo *undo; /* undo requests on this array */ |
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| 32 | unsigned short sem_nsems; /* no. of semaphores in array */ |
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| 33 | }; |
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| 34 | |
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| 35 | /* Include the definition of semid64_ds */ |
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| 36 | #include <asm/sembuf.h> |
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| 37 | |
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| 38 | /* semop system calls takes an array of these. */ |
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| 39 | struct sembuf { |
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| 40 | unsigned short sem_num; /* semaphore index in array */ |
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| 41 | short sem_op; /* semaphore operation */ |
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| 42 | short sem_flg; /* operation flags */ |
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| 43 | }; |
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| 44 | |
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| 45 | /* arg for semctl system calls. */ |
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| 46 | union semun { |
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| 47 | int val; /* value for SETVAL */ |
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| 48 | struct semid_ds *buf; /* buffer for IPC_STAT & IPC_SET */ |
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| 49 | unsigned short *array; /* array for GETALL & SETALL */ |
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| 50 | struct seminfo *__buf; /* buffer for IPC_INFO */ |
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| 51 | void *__pad; |
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| 52 | }; |
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| 53 | |
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| 54 | struct seminfo { |
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| 55 | int semmap; |
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| 56 | int semmni; |
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| 57 | int semmns; |
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| 58 | int semmnu; |
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| 59 | int semmsl; |
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| 60 | int semopm; |
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| 61 | int semume; |
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| 62 | int semusz; |
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| 63 | int semvmx; |
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| 64 | int semaem; |
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| 65 | }; |
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| 66 | |
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| 67 | #define SEMMNI 128 /* <= IPCMNI max # of semaphore identifiers */ |
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| 68 | #define SEMMSL 250 /* <= 8 000 max num of semaphores per id */ |
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| 69 | #define SEMMNS (SEMMNI*SEMMSL) /* <= INT_MAX max # of semaphores in system */ |
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| 70 | #define SEMOPM 32 /* <= 1 000 max num of ops per semop call */ |
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| 71 | #define SEMVMX 32767 /* <= 32767 semaphore maximum value */ |
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| 72 | #define SEMAEM SEMVMX /* adjust on exit max value */ |
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| 73 | |
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| 74 | /* unused */ |
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| 75 | #define SEMUME SEMOPM /* max num of undo entries per process */ |
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| 76 | #define SEMMNU SEMMNS /* num of undo structures system wide */ |
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| 77 | #define SEMMAP SEMMNS /* # of entries in semaphore map */ |
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| 78 | #define SEMUSZ 20 /* sizeof struct sem_undo */ |
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| 79 | |
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| 80 | #endif /* _LINUX_SEM_H */ |
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