sys/sys/shm.h

   1 /* $FreeBSD: src/sys/sys/shm.h,v 1.14 1999/12/29 04:24:46 peter Exp $ */
   2 /*      $NetBSD: shm.h,v 1.15 1994/06/29 06:45:17 cgd Exp $     */
   3
   4 /*
   5  * Copyright (c) 1994 Adam Glass
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. All advertising materials mentioning features or use of this software
  17  *    must display the following acknowledgement:
  18  *      This product includes software developed by Adam Glass.
  19  * 4. The name of the author may not be used to endorse or promote products
  20  *    derived from this software without specific prior written permission
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  23  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  24  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  25  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  26  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  27  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  28  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  29  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  30  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  31  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32  */
  33
  34 /*
  35  * As defined+described in "X/Open System Interfaces and Headers"
  36  *                         Issue 4, p. XXX
  37  */
  38
  39 #ifndef _SYS_SHM_H_
  40 #define _SYS_SHM_H_
  41
  42 #include <sys/cdefs.h>
  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 #if __BSD_VISIBLE
  50 /* "official" access mode definitions; somewhat braindead since you have
  51    to specify (SHM_* >> 3) for group and (SHM_* >> 6) for world permissions */
  52 #define SHM_R       (IPC_R)
  53 #define SHM_W       (IPC_W)
  54 #endif
  55
  56 typedef unsigned int    shmatt_t;
  57
  58 #ifndef _PID_T_DECLARED
  59 typedef __pid_t         pid_t;
  60 #define _PID_T_DECLARED
  61 #endif
  62
  63 #ifndef _SIZE_T_DECLARED
  64 typedef __size_t        size_t;
  65 #define _SIZE_T_DECLARED
  66 #endif
  67
  68 #ifndef _TIME_T_DECLARED
  69 typedef __time_t        time_t;
  70 #define _TIME_T_DECLARED
  71 #endif
  72
  73 struct shmid_ds {
  74         struct ipc_perm shm_perm;       /* operation permission structure */
  75         size_t          shm_segsz;      /* size of segment in bytes */
  76         pid_t           shm_lpid;   /* process ID of last shared memory op */
  77         pid_t           shm_cpid;       /* process ID of creator */
  78         shmatt_t        shm_nattch;     /* number of current attaches */
  79         time_t          shm_atime;      /* time of last shmat() */
  80         time_t          shm_dtime;      /* time of last shmdt() */
  81         time_t          shm_ctime;      /* time of last change by shmctl() */
  82         void           *shm_internal;   /* sysv stupidity */
  83 };
  84
  85 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
  86
  87 /*
  88  * System 5 style catch-all structure for shared memory constants that
  89  * might be of interest to user programs.  Do we really want/need this?
  90  */
  91 struct shminfo {
  92         long    shmmax,         /* max shared memory segment size (bytes) */
  93                 shmmin,         /* min shared memory segment size (bytes) */
  94                 shmmni,         /* max number of shared memory identifiers */
  95                 shmseg,         /* max shared memory segments per process */
  96                 shmall;         /* max amount of shared memory (pages) */
  97 };
  98
  99 #endif
 100
 101 #ifdef _KERNEL
 102
 103 extern struct shminfo   shminfo;
 104
 105 struct proc;
 106 struct vmspace;
 107
 108 void     shmexit(struct vmspace *);
 109 void     shmfork(struct proc *, struct proc *);
 110
 111 #else /* !_KERNEL */
 112
 113 __BEGIN_DECLS
 114 int      shmget(key_t, size_t, int);
 115 int      shmctl(int, int, struct shmid_ds *);
 116 void    *shmat(int, const void *, int);
 117 int      shmdt(const void *);
 118 __END_DECLS
 119
 120 #endif /* !_KERNEL */
 121
 122 #endif /* !_SYS_SHM_H_ */