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96 lines
3.0 KiB
C
96 lines
3.0 KiB
C
/* Copyright (C) 1995-2014 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#ifndef _SYS_SHM_H
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# error "Never include <bits/shm.h> directly; use <sys/shm.h> instead."
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#endif
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#include <bits/types.h>
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#include <bits/ipctypes.h>
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/* Permission flag for shmget. */
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#define SHM_R 0400 /* or S_IRUGO from <linux/stat.h> */
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#define SHM_W 0200 /* or S_IWUGO from <linux/stat.h> */
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/* Flags for `shmat'. */
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#define SHM_RDONLY 010000 /* attach read-only else read-write */
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#define SHM_RND 020000 /* round attach address to SHMLBA */
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#define SHM_REMAP 040000 /* take-over region on attach */
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/* Commands for `shmctl'. */
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#define SHM_LOCK 11 /* lock segment (root only) */
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#define SHM_UNLOCK 12 /* unlock segment (root only) */
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__BEGIN_DECLS
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/* Segment low boundary address multiple. */
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#define SHMLBA (__getpagesize ())
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extern int __getpagesize (void) __THROW __attribute__ ((__const__));
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/* Type to count number of attaches. */
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typedef unsigned short int shmatt_t;
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/* Data structure describing a shared memory segment. */
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struct shmid_ds
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{
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struct ipc_perm shm_perm; /* operation permission struct */
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int shm_segsz; /* size of segment in bytes */
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__time_t shm_atime; /* time of last shmat() */
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__time_t shm_dtime; /* time of last shmdt() */
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__time_t shm_ctime; /* time of last change by shmctl() */
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__ipc_pid_t shm_cpid; /* pid of creator */
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__ipc_pid_t shm_lpid; /* pid of last shmop */
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shmatt_t shm_nattch; /* number of current attaches */
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unsigned short int __shm_npages; /* size of segment (pages) */
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unsigned long int *__shm_pages; /* array of ptrs to frames -> SHMMAX */
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struct vm_area_struct *__attaches; /* descriptors for attaches */
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};
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#ifdef __USE_MISC
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/* ipcs ctl commands */
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# define SHM_STAT 13
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# define SHM_INFO 14
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/* shm_mode upper byte flags */
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# define SHM_DEST 01000 /* segment will be destroyed on last detach */
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# define SHM_LOCKED 02000 /* segment will not be swapped */
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struct shminfo
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{
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int shmmax;
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int shmmin;
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int shmmni;
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int shmseg;
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int shmall;
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};
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struct shm_info
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{
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int used_ids;
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unsigned long int shm_tot; /* total allocated shm */
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unsigned long int shm_rss; /* total resident shm */
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unsigned long int shm_swp; /* total swapped shm */
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unsigned long int swap_attempts;
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unsigned long int swap_successes;
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};
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#endif /* __USE_MISC */
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__END_DECLS
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