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 */