usr/src/uts/common/sys/shm_impl.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 (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 /*
  22  * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
  23  * Use is subject to license terms.
  24  */
  25
  26 #ifndef _SYS_SHM_IMPL_H
  27 #define _SYS_SHM_IMPL_H
  28
  29 #pragma ident   "%Z%%M% %I%     %E% SMI"
  30
  31 #include <sys/ipc_impl.h>
  32 #if defined(_KERNEL) || defined(_KMEMUSER)
  33 #include <sys/shm.h>
  34 #include <sys/avl.h>
  35 #include <sys/t_lock.h>
  36 #endif
  37
  38 #ifdef  __cplusplus
  39 extern "C" {
  40 #endif
  41
  42 /*
  43  * shmsys system call subcodes
  44  */
  45 #define SHMAT   0
  46 #define SHMCTL  1
  47 #define SHMDT   2
  48 #define SHMGET  3
  49 #define SHMIDS  4
  50
  51 /*
  52  *      There is a shared mem id data structure (shmid_ds) for each
  53  *      segment in the system.
  54  */
  55 #if defined(_KERNEL) || defined(_KMEMUSER)
  56 typedef struct kshmid {
  57         kipc_perm_t     shm_perm;       /* operation permission struct */
  58         size_t          shm_segsz;      /* size of segment in bytes */
  59         struct anon_map *shm_amp;       /* segment anon_map pointer */
  60         ushort_t        shm_lkcnt;      /* number of times it is being locked */
  61         pgcnt_t         shm_lkpages;    /* number of pages locked by shmctl */
  62         kmutex_t        shm_mlock;      /* held when locking physical pages */
  63                                         /* Therefore, protects p_lckcnt for */
  64                                         /* pages that back shm */
  65         pid_t           shm_lpid;       /* pid of last shmop */
  66         pid_t           shm_cpid;       /* pid of creator */
  67         ulong_t         shm_ismattch;   /* number of ISM attaches */
  68         time_t          shm_atime;      /* last shmat time */
  69         time_t          shm_dtime;      /* last shmdt time */
  70         time_t          shm_ctime;      /* last change time */
  71         struct sptinfo  *shm_sptinfo;   /* info about ISM segment */
  72         struct seg      *shm_sptseg;    /* pointer to ISM segment */
  73         long            shm_sptprot;    /* was reserved (still a "long") */
  74 } kshmid_t;
  75
  76 /*
  77  *      Segacct Flags.
  78  */
  79 #define SHMSA_ISM       1       /* uses shared page table */
  80
  81 typedef struct sptinfo {
  82         struct as       *sptas;         /* dummy as ptr. for spt segment */
  83 } sptinfo_t;
  84
  85 /*
  86  * Protected by p->p_lock
  87  */
  88 typedef struct segacct {
  89         avl_node_t      sa_tree;
  90         caddr_t         sa_addr;
  91         size_t          sa_len;
  92         ulong_t         sa_flags;
  93         kshmid_t        *sa_id;
  94 } segacct_t;
  95
  96 /*
  97  * Error codes for shmgetid().
  98  */
  99 #define SHMID_NONE      (-1)
 100 #define SHMID_FREE      (-2)
 101
 102 extern void shminit(void);
 103 extern void shmfork(struct proc *, struct proc *);
 104 extern void shmexit(struct proc *);
 105 extern int shmgetid(struct proc *, caddr_t);
 106
 107 #endif  /* _KERNEL */
 108
 109 #if defined(_SYSCALL32)
 110 /*
 111  * LP64 view of the ILP32 shmid_ds structure
 112  */
 113 struct shmid_ds32 {
 114         struct ipc_perm32 shm_perm;     /* operation permission struct */
 115         size32_t        shm_segsz;      /* size of segment in bytes */
 116         caddr32_t       shm_amp;        /* segment anon_map pointer */
 117         uint16_t        shm_lkcnt;      /* number of times it is being locked */
 118         pid32_t         shm_lpid;       /* pid of last shmop */
 119         pid32_t         shm_cpid;       /* pid of creator */
 120         uint32_t        shm_nattch;     /* number of attaches */
 121         uint32_t        shm_cnattch;    /* number of ISM attaches */
 122         time32_t        shm_atime;      /* last shmat time */
 123         int32_t         shm_pad1;       /* reserved for time_t expansion */
 124         time32_t        shm_dtime;      /* last shmdt time */
 125         int32_t         shm_pad2;       /* reserved for time_t expansion */
 126         time32_t        shm_ctime;      /* last change time */
 127         int32_t         shm_pad3;       /* reserved for time_t expansion */
 128         int32_t         shm_pad4[4];    /* reserve area  */
 129 };
 130 #endif
 131
 132 #ifdef  __cplusplus
 133 }
 134 #endif
 135
 136 #endif  /* _SYS_SHM_IMPL_H */