glibc (2.38)
1 /* Copyright (C) 1995-2023 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
26 /* Permission flag for shmget. */
27 #define SHM_R 0400 /* or S_IRUGO from <linux/stat.h> */
28 #define SHM_W 0200 /* or S_IWUGO from <linux/stat.h> */
29
30 /* Flags for `shmat'. */
31 #define SHM_RDONLY 010000 /* attach read-only else read-write */
32 #define SHM_RND 020000 /* round attach address to SHMLBA */
33 #define SHM_REMAP 040000 /* take-over region on attach */
34 #define SHM_EXEC 0100000 /* execution access */
35
36 /* Commands for `shmctl'. */
37 #define SHM_LOCK 11 /* lock segment (root only) */
38 #define SHM_UNLOCK 12 /* unlock segment (root only) */
39
40 __BEGIN_DECLS
41
42 /* Type to count number of attaches. */
43 typedef __syscall_ulong_t shmatt_t;
44
45 #include <bits/types/struct_shmid_ds.h>
46 #include <bits/types/struct_shmid64_ds.h>
47
48 #ifdef __USE_MISC
49
50 /* ipcs ctl commands */
51 # define SHM_STAT 13
52 # define SHM_INFO 14
53 # define SHM_STAT_ANY 15
54
55 /* shm_mode upper byte flags */
56 # define SHM_DEST 01000 /* segment will be destroyed on last detach */
57 # define SHM_LOCKED 02000 /* segment will not be swapped */
58 # define SHM_HUGETLB 04000 /* segment is mapped via hugetlb */
59 # define SHM_NORESERVE 010000 /* don't check for reservations */
60
61 struct shminfo
62 {
63 __syscall_ulong_t shmmax;
64 __syscall_ulong_t shmmin;
65 __syscall_ulong_t shmmni;
66 __syscall_ulong_t shmseg;
67 __syscall_ulong_t shmall;
68 __syscall_ulong_t __glibc_reserved1;
69 __syscall_ulong_t __glibc_reserved2;
70 __syscall_ulong_t __glibc_reserved3;
71 __syscall_ulong_t __glibc_reserved4;
72 };
73
74 struct shm_info
75 {
76 int used_ids;
77 __syscall_ulong_t shm_tot; /* total allocated shm */
78 __syscall_ulong_t shm_rss; /* total resident shm */
79 __syscall_ulong_t shm_swp; /* total swapped shm */
80 __syscall_ulong_t swap_attempts;
81 __syscall_ulong_t swap_successes;
82 };
83
84 #endif /* __USE_MISC */
85
86 __END_DECLS
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