include/sys/sem.h

   1 #ifndef _SYS_SEM_H
   2 #define _SYS_SEM_H
   3
   4 #include <sys/types.h>
   5 #include <sys/ipc.h>
   6
   7 #define SEMMNI  128
   8 #define SEMMSL  250
   9 #define SEMMNS  (SEMMSL*SEMMNI)
  10
  11 #define SEMOPM  32
  12 #define SEMVMX  32767
  13
  14 /* Flags for `semop'.  */
  15 #define SEM_UNDO        0x1000          /* undo the operation on exit */
  16
  17 /* Commands for `semctl'.  */
  18 #define GETPID          11              /* get sempid */
  19 #define GETVAL          12              /* get semval */
  20 #define GETALL          13              /* get all semval's */
  21 #define GETNCNT         14              /* get semncnt */
  22 #define GETZCNT         15              /* get semzcnt */
  23 #define SETVAL          16              /* set semval */
  24 #define SETALL          17              /* set all semval's */
  25
  26
  27 /* Data structure describing a set of semaphores.  */
  28 struct semid_ds
  29 {
  30         struct ipc_perm sem_perm;             /* operation permission struct */
  31         time_t sem_otime;                   /* last semop() time */
  32         unsigned long int __unused1;
  33         time_t sem_ctime;                   /* last time changed by semctl() */
  34         unsigned long int __unused2;
  35         unsigned long int sem_nsems;          /* number of semaphores in set */
  36         unsigned long int __unused3;
  37         unsigned long int __unused4;
  38 };
  39
  40 /* Structure used for argument to `semop' to describe operations.  */
  41 struct sembuf
  42 {
  43         unsigned short int sem_num;   /* semaphore number */
  44         short int sem_op;             /* semaphore operation */
  45         short int sem_flg;            /* operation flag */
  46 };
  47
  48
  49 /* Semaphore control operation.  */
  50 _PROTOTYPE( int semctl, (int __semid, int __semnum, int __cmd, ...));
  51
  52 /* Get semaphore.  */
  53 _PROTOTYPE( int semget, (key_t __key, int __nsems, int __semflg));
  54
  55 /* Operate on semaphore.  */
  56 _PROTOTYPE( int semop, (int __semid, struct sembuf *__sops, size_t __nsops));
  57
  58
  59 #ifdef __USE_MISC
  60
  61 /* ipcs ctl cmds */
  62 # define SEM_STAT 18
  63 # define SEM_INFO 19
  64
  65 struct  seminfo
  66 {
  67         int semmap;
  68         int semmni;
  69         int semmns;
  70         int semmnu;
  71         int semmsl;
  72         int semopm;
  73         int semume;
  74         int semusz;
  75         int semvmx;
  76         int semaem;
  77 };
  78
  79 #endif /* __USE_MISC */
  80
  81 #endif /* _SYS_SEM_H */