The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/sys/shm.h

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    1 /* $FreeBSD: src/sys/sys/shm.h,v 1.9.2.1 1999/09/05 08:22:53 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/ipc.h>
   43 
   44 #define SHM_RDONLY  010000  /* Attach read-only (else read-write) */
   45 #define SHM_RND     020000  /* Round attach address to SHMLBA */
   46 #define SHMLBA      PAGE_SIZE /* Segment low boundary address multiple */
   47 
   48 /* "official" access mode definitions; somewhat braindead since you have
   49    to specify (SHM_* >> 3) for group and (SHM_* >> 6) for world permissions */
   50 #define SHM_R       (IPC_R)
   51 #define SHM_W       (IPC_W)
   52 
   53 
   54 struct shmid_ds {
   55         struct ipc_perm shm_perm;       /* operation permission structure */
   56         int             shm_segsz;      /* size of segment in bytes */
   57         pid_t           shm_lpid;   /* process ID of last shared memory op */
   58         pid_t           shm_cpid;       /* process ID of creator */
   59         short           shm_nattch;     /* number of current attaches */
   60         time_t          shm_atime;      /* time of last shmat() */
   61         time_t          shm_dtime;      /* time of last shmdt() */
   62         time_t          shm_ctime;      /* time of last change by shmctl() */
   63         void           *shm_internal;   /* sysv stupidity */
   64 };
   65 
   66 #ifdef KERNEL
   67 
   68 /*
   69  * System 5 style catch-all structure for shared memory constants that
   70  * might be of interest to user programs.  Do we really want/need this?
   71  */
   72 struct shminfo {
   73         int     shmmax,         /* max shared memory segment size (bytes) */
   74                 shmmin,         /* min shared memory segment size (bytes) */
   75                 shmmni,         /* max number of shared memory identifiers */
   76                 shmseg,         /* max shared memory segments per process */
   77                 shmall;         /* max amount of shared memory (pages) */
   78 };
   79 extern struct shminfo   shminfo;
   80 extern struct shmid_ds  *shmsegs;
   81 
   82 void    shmexit __P((struct proc *));
   83 void    shmfork __P((struct proc *, struct proc *));
   84 #else /* !KERNEL */
   85 
   86 #include <sys/cdefs.h>
   87 
   88 __BEGIN_DECLS
   89 int shmsys __P((int, ...));
   90 void *shmat  __P((int, void *, int));
   91 int shmget __P((key_t, int, int));
   92 int shmctl __P((int, int, struct shmid_ds *));
   93 int shmdt  __P((void *));
   94 __END_DECLS
   95 
   96 #endif /* !KERNEL */
   97 
   98 #endif /* !_SYS_SHM_H_ */

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