posix/include/sys/shm.h

   1 /* $Id: shm.h,v 1.3 2002/05/17 01:37:15 hyperion Exp $
   2  */
   3 /*
   4  * sys/shm.h
   5  *
   6  * shared memory facility. Conforming to the Single UNIX(r) Specification
   7  * Version 2, System Interface & Headers Issue 5
   8  *
   9  * This file is part of the ReactOS Operating System.
  10  *
  11  * Contributors:
  12  *  Created by KJK::Hyperion <noog@libero.it>
  13  *
  14  *  THIS SOFTWARE IS NOT COPYRIGHTED
  15  *
  16  *  This source code is offered for use in the public domain. You may
  17  *  use, modify or distribute it freely.
  18  *
  19  *  This code is distributed in the hope that it will be useful but
  20  *  WITHOUT ANY WARRANTY. ALL WARRANTIES, EXPRESS OR IMPLIED ARE HEREBY
  21  *  DISCLAMED. This includes but is not limited to warranties of
  22  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  23  *
  24  */
  25 #ifndef __SYS_SHM_H_INCLUDED__
  26 #define __SYS_SHM_H_INCLUDED__
  27
  28 /* INCLUDES */
  29
  30 /* OBJECTS */
  31
  32 /* TYPES */
  33 typedef unsigned short shmatt_t;
  34
  35 struct shmid_ds
  36 {
  37  struct ipc_perm shm_perm;  /* operation permission structure */
  38  size_t          shm_segsz;  /* size of segment in bytes */
  39  pid_t           shm_lpid;   /* process ID of last shared memory operation */
  40  pid_t           shm_cpid;   /* process ID of creator */
  41  shmatt_t        shm_nattch; /* number of current attaches */
  42  time_t          shm_atime;  /* time of last shmat() */
  43  time_t          shm_dtime;  /* time of last shmdt() */
  44  time_t          shm_ctime;  /* time of last change by shmctl() */
  45 };
  46
  47 /* CONSTANTS */
  48 #define SHM_RDONLY (0x00000200) /* Attach read-only (else read-write). */
  49 #define SHM_RND    (0x00000400) /* Round attach address to SHMLBA. */
  50
  51 #define SHMLBA     (4096) /* Segment low boundary address multiple. */
  52
  53 /* PROTOTYPES */
  54 void *shmat(int, const void *, int);
  55 int   shmctl(int, int, struct shmid_ds *);
  56 int   shmdt(const void *);
  57 int   shmget(key_t, size_t, int);
  58
  59 /* MACROS */
  60
  61 #endif /* __SYS_SHM_H_INCLUDED__ */
  62
  63 /* EOF */
  64