1 /* Copyright (C) 1995 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, August 1995.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Library General Public License as
7 published by the Free Software Foundation; either version 2 of the
8 License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Library General Public License for more details.
15 You should have received a copy of the GNU Library General Public
16 License along with the GNU C Library; see the file COPYING.LIB. If
17 not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA. */
20 #ifndef _SYS_SHM_BUF_H
21 #define _SYS_SHM_BUF_H
24 #include <sys/types.h>
26 /* Flags for `shmat'. */
27 #define SHM_RDONLY 010000 /* attach read-only else read-write */
28 #define SHM_RND 020000 /* round attach address to SHMLBA */
29 #define SHM_REMAP 040000 /* take-over region on attach */
31 /* Commands for `shmctl'. */
32 #define SHM_LOCK 11 /* lock segment (root only) */
33 #define SHM_UNLOCK 12 /* unlock segment (root only) */
38 /* Data structure describing a set of semaphores. */
41 struct ipc_perm shm_perm; /* operation permisson struct */
42 int shm_segsz; /* size of segment in bytes */
43 __time_t shm_atime; /* time of last shmat() */
44 __time_t shm_dtime; /* time of last shmdt() */
45 __time_t shm_ctime; /* time of last change by shmctl() */
46 __pid_t shm_cpid; /* pid of creator */
47 __pid_t shm_lpid; /* pid of last shmop */
48 unsigned short int shm_nattch; /* number of current attaches */
49 unsigned short int __shm_npages; /* size of segment (pages) */
50 unsigned long int *__shm_pages; /* array of ptrs to frames -> SHMMAX */
51 struct vm_area_struct *__attaches; /* descriptors for attaches */
56 /* ipcs ctl commands */
60 /* shm_mode upper byte flags */
61 #define SHM_DEST 01000 /* segment will be destroyed on last detach */
62 #define SHM_LOCKED 02000 /* segment will not be swapped */
74 ulong shm_tot; /* total allocated shm */
75 ulong shm_rss; /* total resident shm */
76 ulong shm_swp; /* total swapped shm */
81 #endif /* __USE_MISC */
85 #endif /* sys/shm_buf.h */