1/* Copyright (C) 1995-2020 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 <https://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#include <bits/wordsize.h>
24#include <bits/shmlba.h>
25#include <bits/shm-pad.h>
26
27/* Permission flag for shmget. */
28#define SHM_R 0400 /* or S_IRUGO from <linux/stat.h> */
29#define SHM_W 0200 /* or S_IWUGO from <linux/stat.h> */
30
31/* Flags for `shmat'. */
32#define SHM_RDONLY 010000 /* attach read-only else read-write */
33#define SHM_RND 020000 /* round attach address to SHMLBA */
34#define SHM_REMAP 040000 /* take-over region on attach */
35#define SHM_EXEC 0100000 /* execution access */
36
37/* Commands for `shmctl'. */
38#define SHM_LOCK 11 /* lock segment (root only) */
39#define SHM_UNLOCK 12 /* unlock segment (root only) */
40
41__BEGIN_DECLS
42
43/* Type to count number of attaches. */
44typedef __syscall_ulong_t shmatt_t;
45
46#if __SHM_PAD_BEFORE_TIME
47# define __SHM_PAD_TIME(NAME, RES) \
48 unsigned long int __glibc_reserved ## RES; __time_t NAME
49#elif __SHM_PAD_AFTER_TIME
50# define __SHM_PAD_TIME(NAME, RES) \
51 __time_t NAME; unsigned long int __glibc_reserved ## RES
52#else
53# define __SHM_PAD_TIME(NAME, RES) \
54 __time_t NAME
55#endif
56
57/* Data structure describing a shared memory segment. */
58struct shmid_ds
59 {
60 struct ipc_perm shm_perm; /* operation permission struct */
61#if !__SHM_SEGSZ_AFTER_TIME
62 size_t shm_segsz; /* size of segment in bytes */
63#endif
64 __SHM_PAD_TIME (shm_atime, 1); /* time of last shmat() */
65 __SHM_PAD_TIME (shm_dtime, 2); /* time of last shmdt() */
66 __SHM_PAD_TIME (shm_ctime, 3); /* time of last change by shmctl() */
67#if __SHM_PAD_BETWEEN_TIME_AND_SEGSZ
68 unsigned long int __glibc_reserved4;
69#endif
70#if __SHM_SEGSZ_AFTER_TIME
71 size_t shm_segsz; /* size of segment in bytes */
72#endif
73 __pid_t shm_cpid; /* pid of creator */
74 __pid_t shm_lpid; /* pid of last shmop */
75 shmatt_t shm_nattch; /* number of current attaches */
76 __syscall_ulong_t __glibc_reserved5;
77 __syscall_ulong_t __glibc_reserved6;
78 };
79
80#ifdef __USE_MISC
81
82/* ipcs ctl commands */
83# define SHM_STAT 13
84# define SHM_INFO 14
85# define SHM_STAT_ANY 15
86
87/* shm_mode upper byte flags */
88# define SHM_DEST 01000 /* segment will be destroyed on last detach */
89# define SHM_LOCKED 02000 /* segment will not be swapped */
90# define SHM_HUGETLB 04000 /* segment is mapped via hugetlb */
91# define SHM_NORESERVE 010000 /* don't check for reservations */
92
93struct shminfo
94 {
95 __syscall_ulong_t shmmax;
96 __syscall_ulong_t shmmin;
97 __syscall_ulong_t shmmni;
98 __syscall_ulong_t shmseg;
99 __syscall_ulong_t shmall;
100 __syscall_ulong_t __glibc_reserved1;
101 __syscall_ulong_t __glibc_reserved2;
102 __syscall_ulong_t __glibc_reserved3;
103 __syscall_ulong_t __glibc_reserved4;
104 };
105
106struct shm_info
107 {
108 int used_ids;
109 __syscall_ulong_t shm_tot; /* total allocated shm */
110 __syscall_ulong_t shm_rss; /* total resident shm */
111 __syscall_ulong_t shm_swp; /* total swapped shm */
112 __syscall_ulong_t swap_attempts;
113 __syscall_ulong_t swap_successes;
114 };
115
116#endif /* __USE_MISC */
117
118__END_DECLS
119