LXR linux/include/uapi/linux/sem.h

   1#ifndef _UAPI_LINUX_SEM_H
   2#define _UAPI_LINUX_SEM_H
   3
   4#include <linux/ipc.h>
   5
   6/* semop flags */
   7#define SEM_UNDO        0x1000  /* undo the operation on exit */
   8
   9/* semctl Command Definitions. */
  10#define GETPID  11       /* get sempid */
  11#define GETVAL  12       /* get semval */
  12#define GETALL  13       /* get all semval's */
  13#define GETNCNT 14       /* get semncnt */
  14#define GETZCNT 15       /* get semzcnt */
  15#define SETVAL  16       /* set semval */
  16#define SETALL  17       /* set all semval's */
  17
  18/* ipcs ctl cmds */
  19#define SEM_STAT 18
  20#define SEM_INFO 19
  21
  22/* Obsolete, used only for backwards compatibility and libc5 compiles */
  23struct semid_ds {
  24        struct ipc_perm sem_perm;               /* permissions .. see ipc.h */
  25        __kernel_time_t sem_otime;              /* last semop time */
  26        __kernel_time_t sem_ctime;              /* last change time */
  27        struct sem      *sem_base;              /* ptr to first semaphore in array */
  28        struct sem_queue *sem_pending;          /* pending operations to be processed */
  29        struct sem_queue **sem_pending_last;    /* last pending operation */
  30        struct sem_undo *undo;                  /* undo requests on this array */
  31        unsigned short  sem_nsems;              /* no. of semaphores in array */
  32};
  33
  34/* Include the definition of semid64_ds */
  35#include <asm/sembuf.h>
  36
  37/* semop system calls takes an array of these. */
  38struct sembuf {
  39        unsigned short  sem_num;        /* semaphore index in array */
  40        short           sem_op;         /* semaphore operation */
  41        short           sem_flg;        /* operation flags */
  42};
  43
  44/* arg for semctl system calls. */
  45union semun {
  46        int val;                        /* value for SETVAL */
  47        struct semid_ds __user *buf;    /* buffer for IPC_STAT & IPC_SET */
  48        unsigned short __user *array;   /* array for GETALL & SETALL */
  49        struct seminfo __user *__buf;   /* buffer for IPC_INFO */
  50        void __user *__pad;
  51};
  52
  53struct  seminfo {
  54        int semmap;
  55        int semmni;
  56        int semmns;
  57        int semmnu;
  58        int semmsl;
  59        int semopm;
  60        int semume;
  61        int semusz;
  62        int semvmx;
  63        int semaem;
  64};
  65
  66/*
  67 * SEMMNI, SEMMSL and SEMMNS are default values which can be
  68 * modified by sysctl.
  69 * The values has been chosen to be larger than necessary for any
  70 * known configuration.
  71 *
  72 * SEMOPM should not be increased beyond 1000, otherwise there is the
  73 * risk that semop()/semtimedop() fails due to kernel memory fragmentation when
  74 * allocating the sop array.
  75 */
  76
  77
  78#define SEMMNI  32000           /* <= IPCMNI  max # of semaphore identifiers */
  79#define SEMMSL  32000           /* <= INT_MAX max num of semaphores per id */
  80#define SEMMNS  (SEMMNI*SEMMSL) /* <= INT_MAX max # of semaphores in system */
  81#define SEMOPM  500             /* <= 1 000 max num of ops per semop call */
  82#define SEMVMX  32767           /* <= 32767 semaphore maximum value */
  83#define SEMAEM  SEMVMX          /* adjust on exit max value */
  84
  85/* unused */
  86#define SEMUME  SEMOPM          /* max num of undo entries per process */
  87#define SEMMNU  SEMMNS          /* num of undo structures system wide */
  88#define SEMMAP  SEMMNS          /* # of entries in semaphore map */
  89#define SEMUSZ  20              /* sizeof struct sem_undo */
  90
  91
  92#endif /* _UAPI_LINUX_SEM_H */
  93