/* 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 */ unsignedshort 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 { unsignedshort 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 */ unsignedshort __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 */
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