1/* Copyright (C) 1995-2018 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <http://www.gnu.org/licenses/>. */
17
18#ifndef _SYS_SHM_H
19# error "Never include <bits/shm.h> directly; use <sys/shm.h> instead."
20#endif
21
22#include <bits/types.h>
23
24/* Permission flag for shmget. */
25#define SHM_R 0400 /* or S_IRUGO from <linux/stat.h> */
26#define SHM_W 0200 /* or S_IWUGO from <linux/stat.h> */
27
28/* Flags for `shmat'. */
29#define SHM_RDONLY 010000 /* attach read-only else read-write */
30#define SHM_RND 020000 /* round attach address to SHMLBA */
31#define SHM_REMAP 040000 /* take-over region on attach */
32#define SHM_EXEC 0100000 /* execution access */
33
34/* Commands for `shmctl'. */
35#define SHM_LOCK 11 /* lock segment (root only) */
36#define SHM_UNLOCK 12 /* unlock segment (root only) */
37
38__BEGIN_DECLS
39
40/* Segment low boundary address multiple. */
41#define SHMLBA (__getpagesize ())
42extern int __getpagesize (void) __THROW __attribute__ ((__const__));
43
44
45/* Type to count number of attaches. */
46typedef __syscall_ulong_t shmatt_t;
47
48/* Data structure describing a shared memory segment. */
49struct shmid_ds
50 {
51 struct ipc_perm shm_perm; /* operation permission struct */
52 size_t shm_segsz; /* size of segment in bytes */
53 __time_t shm_atime; /* time of last shmat() */
54#ifndef __x86_64__
55 unsigned long int __glibc_reserved1;
56#endif
57 __time_t shm_dtime; /* time of last shmdt() */
58#ifndef __x86_64__
59 unsigned long int __glibc_reserved2;
60#endif
61 __time_t shm_ctime; /* time of last change by shmctl() */
62#ifndef __x86_64__
63 unsigned long int __glibc_reserved3;
64#endif
65 __pid_t shm_cpid; /* pid of creator */
66 __pid_t shm_lpid; /* pid of last shmop */
67 shmatt_t shm_nattch; /* number of current attaches */
68 __syscall_ulong_t __glibc_reserved4;
69 __syscall_ulong_t __glibc_reserved5;
70 };
71
72#ifdef __USE_MISC
73
74/* ipcs ctl commands */
75# define SHM_STAT 13
76# define SHM_INFO 14
77
78/* shm_mode upper byte flags */
79# define SHM_DEST 01000 /* segment will be destroyed on last detach */
80# define SHM_LOCKED 02000 /* segment will not be swapped */
81# define SHM_HUGETLB 04000 /* segment is mapped via hugetlb */
82# define SHM_NORESERVE 010000 /* don't check for reservations */
83
84struct shminfo
85 {
86 __syscall_ulong_t shmmax;
87 __syscall_ulong_t shmmin;
88 __syscall_ulong_t shmmni;
89 __syscall_ulong_t shmseg;
90 __syscall_ulong_t shmall;
91 __syscall_ulong_t __glibc_reserved1;
92 __syscall_ulong_t __glibc_reserved2;
93 __syscall_ulong_t __glibc_reserved3;
94 __syscall_ulong_t __glibc_reserved4;
95 };
96
97struct shm_info
98 {
99 int used_ids;
100 __syscall_ulong_t shm_tot; /* total allocated shm */
101 __syscall_ulong_t shm_rss; /* total resident shm */
102 __syscall_ulong_t shm_swp; /* total swapped shm */
103 __syscall_ulong_t swap_attempts;
104 __syscall_ulong_t swap_successes;
105 };
106
107#endif /* __USE_MISC */
108
109__END_DECLS
110