sys/sys/sem.h

   1 /* $FreeBSD: src/sys/sys/sem.h,v 1.20.2.2 2000/08/04 22:31:10 peter Exp $ */
   2 /* $DragonFly: src/sys/sys/sem.h,v 1.4 2003/08/27 02:03:22 dillon Exp $ */
   3 /*      $NetBSD: sem.h,v 1.5 1994/06/29 06:45:15 cgd Exp $      */
   4
   5 /*
   6  * SVID compatible sem.h file
   7  *
   8  * Author:  Daniel Boulet
   9  */
  10
  11 #ifndef _SYS_SEM_H_
  12 #define _SYS_SEM_H_
  13
  14 #include <sys/ipc.h>
  15
  16 struct sem;
  17
  18 struct semid_ds {
  19         struct  ipc_perm sem_perm;      /* operation permission struct */
  20         struct  sem *sem_base;  /* pointer to first semaphore in set */
  21         u_short sem_nsems;      /* number of sems in set */
  22         time_t  sem_otime;      /* last operation time */
  23         long    sem_pad1;       /* SVABI/386 says I need this here */
  24         time_t  sem_ctime;      /* last change time */
  25                                 /* Times measured in secs since */
  26                                 /* 00:00:00 GMT, Jan. 1, 1970 */
  27         long    sem_pad2;       /* SVABI/386 says I need this here */
  28         long    sem_pad3[4];    /* SVABI/386 says I need this here */
  29 };
  30
  31 /*
  32  * semop's sops parameter structure
  33  */
  34 struct sembuf {
  35         u_short sem_num;        /* semaphore # */
  36         short   sem_op;         /* semaphore operation */
  37         short   sem_flg;        /* operation flags */
  38 };
  39 #define SEM_UNDO        010000
  40
  41 #define MAX_SOPS        5       /* maximum # of sembuf's per semop call */
  42
  43 /*
  44  * semctl's arg parameter structure
  45  */
  46 union semun {
  47         int     val;            /* value for SETVAL */
  48         struct  semid_ds *buf;  /* buffer for IPC_STAT & IPC_SET */
  49         u_short *array;         /* array for GETALL & SETALL */
  50 };
  51
  52 /*
  53  * commands for semctl
  54  */
  55 #define GETNCNT 3       /* Return the value of semncnt {READ} */
  56 #define GETPID  4       /* Return the value of sempid {READ} */
  57 #define GETVAL  5       /* Return the value of semval {READ} */
  58 #define GETALL  6       /* Return semvals into arg.array {READ} */
  59 #define GETZCNT 7       /* Return the value of semzcnt {READ} */
  60 #define SETVAL  8       /* Set the value of semval to arg.val {ALTER} */
  61 #define SETALL  9       /* Set semvals from arg.array {ALTER} */
  62
  63 /*
  64  * Permissions
  65  */
  66 #define SEM_A           0200    /* alter permission */
  67 #define SEM_R           0400    /* read permission */
  68
  69 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
  70
  71 /*
  72  * semaphore info struct
  73  */
  74 struct seminfo {
  75         int     semmap,         /* # of entries in semaphore map */
  76                 semmni,         /* # of semaphore identifiers */
  77                 semmns,         /* # of semaphores in system */
  78                 semmnu,         /* # of undo structures in system */
  79                 semmsl,         /* max # of semaphores per id */
  80                 semopm,         /* max # of operations per semop call */
  81                 semume,         /* max # of undo entries per process */
  82                 semusz,         /* size in bytes of undo structure */
  83                 semvmx,         /* semaphore maximum value */
  84                 semaem;         /* adjust on exit max value */
  85 };
  86
  87 /* internal "mode" bits */
  88 #define SEM_ALLOC       01000   /* semaphore is allocated */
  89 #define SEM_DEST        02000   /* semaphore will be destroyed on last detach */
  90
  91 #endif /* _KERNEL || _KERNEL_STRUCTURES */
  92
  93 #ifdef _KERNEL
  94
  95 /*
  96  * Process sem_undo vectors at proc exit.
  97  */
  98 void    semexit (struct proc *p);
  99 extern struct seminfo   seminfo;
 100
 101 #endif
 102
 103 #ifndef _KERNEL
 104 #include <sys/cdefs.h>
 105
 106 __BEGIN_DECLS
 107 int semsys (int, ...);
 108 int semctl (int, int, int, ...);
 109 int semget (key_t, int, int);
 110 int semop (int, struct sembuf *,unsigned);
 111 __END_DECLS
 112 #endif /* !_KERNEL */
 113
 114 #endif /* !_SEM_H_ */