usr/src/uts/common/sys/shm.h

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright 2014 Garrett D'Amore <garrett@damore.org>
  24  *
  25  * Copyright 2003 Sun Microsystems, Inc.  All rights reserved.
  26  * Use is subject to license terms.
  27  */
  28
  29 /*      Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T     */
  30 /*        All Rights Reserved   */
  31
  32 /*
  33  * Portions of this source code were derived from Berkeley 4.3 BSD
  34  * under license from the Regents of the University of California.
  35  */
  36
  37 #ifndef _SYS_SHM_H
  38 #define _SYS_SHM_H
  39
  40 #include <sys/ipc.h>
  41
  42 #ifdef  __cplusplus
  43 extern "C" {
  44 #endif
  45
  46 /*
  47  *      IPC Shared Memory Facility.
  48  */
  49
  50 /*
  51  *      Implementation Constants.
  52  */
  53 #if (defined(_KERNEL) || defined(_KMEMUSER))
  54
  55 #define SHMLBA  PAGESIZE        /* segment low boundary address multiple */
  56                                 /* (SHMLBA must be a power of 2) */
  57 #else
  58 #include <sys/unistd.h>         /* needed for _SC_PAGESIZE */
  59 extern long _sysconf(int);      /* System Private interface to sysconf() */
  60 #define SHMLBA  (_sysconf(_SC_PAGESIZE))
  61 #endif  /* defined(_KERNEL) || defined(_KMEMUSER)) */
  62
  63 /*
  64  *      Permission Definitions.
  65  */
  66 #define SHM_R   0400    /* read permission */
  67 #define SHM_W   0200    /* write permission */
  68
  69 /*
  70  *      Message Operation Flags.
  71  */
  72 #define SHM_RDONLY      010000  /* attach read-only (else read-write) */
  73 #define SHM_RND         020000  /* round attach address to SHMLBA */
  74 #define SHM_SHARE_MMU   040000  /* share VM resources such as page table */
  75 #define SHM_PAGEABLE    0100000 /* pageable ISM */
  76
  77 /*
  78  * Valid flags bits for shmat shmflag argument.
  79  */
  80 #define SHMAT_VALID_FLAGS_MASK          \
  81         (SHM_R | SHM_W | SHM_RDONLY | SHM_RND | SHM_SHARE_MMU | SHM_PAGEABLE)
  82
  83 typedef unsigned long shmatt_t;
  84
  85 /*
  86  *      Structure Definitions.
  87  */
  88 struct shmid_ds {
  89         struct ipc_perm shm_perm;       /* operation permission struct */
  90         size_t          shm_segsz;      /* size of segment in bytes */
  91 #if defined(_LP64) || defined(_XOPEN_SOURCE)
  92         void            *shm_amp;
  93 #else
  94         struct anon_map *shm_amp;       /* segment anon_map pointer */
  95 #endif
  96         ushort_t        shm_lkcnt;      /* number of times it is being locked */
  97         pid_t           shm_lpid;       /* pid of last shmop */
  98         pid_t           shm_cpid;       /* pid of creator */
  99         shmatt_t        shm_nattch;     /* number of attaches */
 100         ulong_t         shm_cnattch;    /* number of ISM attaches */
 101 #if defined(_LP64)
 102         time_t          shm_atime;      /* last shmat time */
 103         time_t          shm_dtime;      /* last shmdt time */
 104         time_t          shm_ctime;      /* last change time */
 105         int64_t         shm_pad4[4];    /* reserve area */
 106 #else   /* _LP64 */
 107         time_t          shm_atime;      /* last shmat time */
 108         int32_t         shm_pad1;       /* reserved for time_t expansion */
 109         time_t          shm_dtime;      /* last shmdt time */
 110         int32_t         shm_pad2;       /* reserved for time_t expansion */
 111         time_t          shm_ctime;      /* last change time */
 112         int32_t         shm_pad3;       /* reserved for time_t expansion */
 113         int32_t         shm_pad4[4];    /* reserve area  */
 114 #endif  /* _LP64 */
 115 };
 116
 117 /*
 118  * Shared memory control operations
 119  */
 120 #define SHM_LOCK        3       /* Lock segment in core */
 121 #define SHM_UNLOCK      4       /* Unlock segment */
 122
 123 #if !defined(_KERNEL)
 124 int shmget(key_t, size_t, int);
 125 int shmids(int *, uint_t, uint_t *);
 126 int shmctl(int, int, struct shmid_ds *);
 127 void *shmat(int, const void *, int);
 128 #if defined(_XPG4)
 129 int shmdt(const void *);
 130 #else
 131 int shmdt(char *);
 132 #endif /* defined(_XPG4) */
 133 #endif /* !defined(_KERNEL) */
 134
 135 #ifdef  __cplusplus
 136 }
 137 #endif
 138
 139 #endif  /* _SYS_SHM_H */