Blame bits/shm.h

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/* Copyright (C) 1995-2018 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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/* 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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    size_t 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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    __pid_t shm_cpid;			/* pid of creator */
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    __pid_t shm_lpid;			/* pid of last shmop */
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    shmatt_t shm_nattch;		/* number of current attaches */
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  };
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__END_DECLS