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 */
  23 struct 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. */
  38 struct 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. */
  45 union 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
  53 struct  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 */