1 /* Copyright (C) 1995-2014 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
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.
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.
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/>. */
19 # error "Never include <bits/shm.h> directly; use <sys/shm.h> instead."
22 #include <bits/types.h>
23 #include <bits/wordsize.h>
25 /* Permission flag for shmget. */
26 #define SHM_R 0400 /* or S_IRUGO from <linux/stat.h> */
27 #define SHM_W 0200 /* or S_IWUGO from <linux/stat.h> */
29 /* Flags for `shmat'. */
30 #define SHM_RDONLY 010000 /* attach read-only else read-write */
31 #define SHM_RND 020000 /* round attach address to SHMLBA */
32 #define SHM_REMAP 040000 /* take-over region on attach */
34 /* Commands for `shmctl'. */
35 #define SHM_LOCK 11 /* lock segment (root only) */
36 #define SHM_UNLOCK 12 /* unlock segment (root only) */
38 /* Segment low boundary address multiple. */
39 #define SHMLBA 0x00400000 /* address needs to be 4 Mb aligned */
41 /* Type to count number of attaches. */
42 typedef unsigned long int shmatt_t
;
44 /* Data structure describing a shared memory segment. */
47 struct ipc_perm shm_perm
; /* operation permission struct */
51 __time_t shm_atime
; /* time of last shmat() */
55 __time_t shm_dtime
; /* time of last shmdt() */
59 __time_t shm_ctime
; /* time of last change by shmctl() */
63 size_t shm_segsz
; /* size of segment in bytes */
64 __pid_t shm_cpid
; /* pid of creator */
65 __pid_t shm_lpid
; /* pid of last shmop */
66 shmatt_t shm_nattch
; /* number of current attaches */
67 unsigned long int __glibc_reserved1
;
68 unsigned long int __glibc_reserved2
;
73 /* ipcs ctl commands */
77 /* shm_mode upper byte flags */
78 # define SHM_DEST 01000 /* segment will be destroyed on last detach */
79 # define SHM_LOCKED 02000 /* segment will not be swapped */
80 # define SHM_HUGETLB 04000 /* segment is mapped via hugetlb */
81 # define SHM_NORESERVE 010000 /* don't check for reservations */
90 unsigned long __glibc_reserved1
;
91 unsigned long __glibc_reserved2
;
92 unsigned long __glibc_reserved3
;
93 unsigned long __glibc_reserved4
;
99 unsigned long int shm_tot
; /* total allocated shm */
100 unsigned long int shm_rss
; /* total resident shm */
101 unsigned long int shm_swp
; /* total swapped shm */
102 unsigned long int swap_attempts
;
103 unsigned long int swap_successes
;
106 #endif /* __USE_MISC */