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 /*      $NetBSD: sem.h,v 1.5 1994/06/29 06:45:15 cgd Exp $      */
   3
   4 /*
   5  * SVID compatible sem.h file
   6  *
   7  * Author:  Daniel Boulet
   8  */
   9
  10 #ifndef _SYS_SEM_H_
  11 #define _SYS_SEM_H_
  12
  13 #include <sys/cdefs.h>
  14 #include <sys/ipc.h>
  15
  16 #ifndef _PID_T_DECLARED
  17 typedef __pid_t         pid_t;
  18 #define _PID_T_DECLARED
  19 #endif
  20
  21 #ifndef _SIZE_T_DECLARED
  22 typedef __size_t        size_t;
  23 #define _SIZE_T_DECLARED
  24 #endif
  25
  26 #ifndef _TIME_T_DECLARED
  27 typedef __time_t        time_t;
  28 #define _TIME_T_DECLARED
  29 #endif
  30
  31 struct sem;
  32
  33 struct semid_ds {
  34         struct  ipc_perm sem_perm;      /* operation permission struct */
  35         struct  sem *sem_base;  /* pointer to first semaphore in set */
  36         unsigned short sem_nsems;       /* number of sems in set */
  37         time_t  sem_otime;      /* last operation time */
  38         long    sem_pad1;       /* SVABI/386 says I need this here */
  39         time_t  sem_ctime;      /* last change time */
  40                                 /* Times measured in secs since */
  41                                 /* 00:00:00 GMT, Jan. 1, 1970 */
  42         long    sem_pad2;       /* SVABI/386 says I need this here */
  43         long    sem_pad3[4];    /* SVABI/386 says I need this here */
  44 };
  45
  46 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
  47
  48 #include <sys/lock.h>
  49
  50 struct semid_pool {
  51         struct lock lk;
  52         struct semid_ds ds;
  53         long gen;
  54 };
  55
  56 #endif
  57
  58 /*
  59  * semop's sops parameter structure
  60  */
  61 struct sembuf {
  62         unsigned short sem_num; /* semaphore # */
  63         short   sem_op;         /* semaphore operation */
  64         short   sem_flg;        /* operation flags */
  65 };
  66 #define SEM_UNDO        010000
  67
  68 #if __BSD_VISIBLE
  69 #define MAX_SOPS        5       /* maximum # of sembuf's per semop call */
  70
  71 /*
  72  * semctl's arg parameter structure
  73  */
  74 union semun {
  75         int     val;            /* value for SETVAL */
  76         struct  semid_ds *buf;  /* buffer for IPC_STAT & IPC_SET */
  77         u_short *array;         /* array for GETALL & SETALL */
  78 };
  79 #endif /* __BSD_VISIBLE */
  80
  81 /*
  82  * commands for semctl
  83  */
  84 #define GETNCNT 3       /* Return the value of semncnt {READ} */
  85 #define GETPID  4       /* Return the value of sempid {READ} */
  86 #define GETVAL  5       /* Return the value of semval {READ} */
  87 #define GETALL  6       /* Return semvals into arg.array {READ} */
  88 #define GETZCNT 7       /* Return the value of semzcnt {READ} */
  89 #define SETVAL  8       /* Set the value of semval to arg.val {ALTER} */
  90 #define SETALL  9       /* Set semvals from arg.array {ALTER} */
  91 #if __BSD_VISIBLE
  92 #define SEM_STAT 10     /* Like IPC_STAT but treats semid as sema-index */
  93
  94 /*
  95  * Permissions
  96  */
  97 #define SEM_A           0200    /* alter permission */
  98 #define SEM_R           0400    /* read permission */
  99 #endif /* __BSD_VISIBLE */
 100
 101 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
 102
 103 /*
 104  * semaphore info struct
 105  */
 106 struct seminfo {
 107         int     semmap,         /* # of entries in semaphore map */
 108                 semmni,         /* # of semaphore identifiers */
 109                 semmns,         /* # of semaphores in system */
 110                 semmnu,         /* # of undo structures in system */
 111                 semmsl,         /* max # of semaphores per id */
 112                 semopm,         /* max # of operations per semop call */
 113                 semume,         /* max # of undo entries per process */
 114                 semusz,         /* size in bytes of undo structure */
 115                 semvmx,         /* semaphore maximum value */
 116                 semaem;         /* adjust on exit max value */
 117 };
 118
 119 /* internal "mode" bits */
 120 #define SEM_ALLOC       01000   /* semaphore is allocated */
 121 #define SEM_DEST        02000   /* semaphore will be destroyed on last detach */
 122
 123 #endif /* _KERNEL || _KERNEL_STRUCTURES */
 124
 125 #ifdef _KERNEL
 126 /*
 127  * Process sem_undo vectors at proc exit.
 128  */
 129 void    semexit(struct proc *p);
 130 extern struct seminfo   seminfo;
 131 #else
 132 __BEGIN_DECLS
 133 int     semctl(int, int, int, ...);
 134 int     semget(key_t, int, int);
 135 int     semop(int, struct sembuf *, unsigned);
 136 __END_DECLS
 137 #endif /* !_KERNEL */
 138
 139 #endif /* !_SEM_H_ */