File: sysvshm.h

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glibc 2.28-10
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/* Copyright (C) 2005 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, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

#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.  Returns its size if found, or EINVAL
   otherwise.  */
error_t __sysvshm_remove (void *addr, size_t *size);