sys/sys/shm.h

   1 /* $FreeBSD: src/sys/sys/shm.h,v 1.14 1999/12/29 04:24:46 peter Exp $ */
   2 /* $DragonFly: src/sys/sys/shm.h,v 1.6 2006/09/30 20:03:44 swildner Exp $ */
   3 /*      $NetBSD: shm.h,v 1.15 1994/06/29 06:45:17 cgd Exp $     */
   4
   5 /*
   6  * Copyright (c) 1994 Adam Glass
   7  * All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  * 3. All advertising materials mentioning features or use of this software
  18  *    must display the following acknowledgement:
  19  *      This product includes software developed by Adam Glass.
  20  * 4. The name of the author may not be used to endorse or promote products
  21  *    derived from this software without specific prior written permission
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  24  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  25  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  26  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  27  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  28  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  29  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  30  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  31  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  32  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  33  */
  34
  35 /*
  36  * As defined+described in "X/Open System Interfaces and Headers"
  37  *                         Issue 4, p. XXX
  38  */
  39
  40 #ifndef _SYS_SHM_H_
  41 #define _SYS_SHM_H_
  42
  43 #include <sys/ipc.h>
  44
  45 #define SHM_RDONLY  010000  /* Attach read-only (else read-write) */
  46 #define SHM_RND     020000  /* Round attach address to SHMLBA */
  47 #define SHMLBA      PAGE_SIZE /* Segment low boundary address multiple */
  48
  49 /* "official" access mode definitions; somewhat braindead since you have
  50    to specify (SHM_* >> 3) for group and (SHM_* >> 6) for world permissions */
  51 #define SHM_R       (IPC_R)
  52 #define SHM_W       (IPC_W)
  53
  54
  55 struct shmid_ds {
  56         struct ipc_perm shm_perm;       /* operation permission structure */
  57         int             shm_segsz;      /* size of segment in bytes */
  58         pid_t           shm_lpid;   /* process ID of last shared memory op */
  59         pid_t           shm_cpid;       /* process ID of creator */
  60         short           shm_nattch;     /* number of current attaches */
  61         time_t          shm_atime;      /* time of last shmat() */
  62         time_t          shm_dtime;      /* time of last shmdt() */
  63         time_t          shm_ctime;      /* time of last change by shmctl() */
  64         void           *shm_internal;   /* sysv stupidity */
  65 };
  66
  67 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
  68
  69 /*
  70  * System 5 style catch-all structure for shared memory constants that
  71  * might be of interest to user programs.  Do we really want/need this?
  72  */
  73 struct shminfo {
  74         int     shmmax,         /* max shared memory segment size (bytes) */
  75                 shmmin,         /* min shared memory segment size (bytes) */
  76                 shmmni,         /* max number of shared memory identifiers */
  77                 shmseg,         /* max shared memory segments per process */
  78                 shmall;         /* max amount of shared memory (pages) */
  79 };
  80
  81 #endif
  82
  83 #ifdef _KERNEL
  84
  85 extern struct shminfo   shminfo;
  86
  87 struct proc;
  88 struct vmspace;
  89
  90 void    shmexit (struct vmspace *);
  91 void    shmfork (struct proc *, struct proc *);
  92
  93 #else /* !_KERNEL */
  94
  95 #include <sys/cdefs.h>
  96
  97 __BEGIN_DECLS
  98 int shmsys (int, ...);
  99 void *shmat  (int, void *, int);
 100 int shmget (key_t, int, int);
 101 int shmctl (int, int, struct shmid_ds *);
 102 int shmdt  (void *);
 103 __END_DECLS
 104
 105 #endif /* !_KERNEL */
 106
 107 #endif /* !_SYS_SHM_H_ */