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/* SysV shared memory for Hurd.
Copyright (C) 2005-2015 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#ifndef _HURD_SYSVSHM_H
#define _HURD_SYSVSHM_H
#include <paths.h>
#include <hurd.h>
/* The area (from top to bottom) that is used for private keys. These
are all keys that have the second highest bit set. */
#define SHM_PRIV_KEY_START INT_MAX
#define SHM_PRIV_KEY_END ((INT_MAX / 2) + 1)
#define SHM_PREFIX "sysvshm-"
#define SHM_DIR _PATH_DEV "shm/"
/* The maximum number of characters in a shared memory segment file name.
32 is the max number of characters in a 128 bit number in hex. */
#if __WORDSIZE > 128
#error Need to increase SHM_NAMEMAX.
#else
#define SHM_NAMEMAX (sizeof (SHM_PREFIX) - 1 + 32 + 1)
#endif
/* Use this with printf and its variants. */
#define SHM_NAMEPRI SHM_PREFIX "%0x"
/* Adds a segment attachment. */
error_t __sysvshm_add (void *addr, size_t size);
/* Removes a segment attachment. On success, returns 0 and sets *SIZE to its
size. Returns EINVAL if not found. */
error_t __sysvshm_remove (void *addr, size_t *size);
#endif /* sysvshm.h */
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