/* $Id$ */

/* Copyright (C) 1995, 1996, 1997 Free Software Foundation, Inc.
   This file is part of the Gnome Top Library.
   Contributed by Martin Baulig <martin@home-of-linux.org>, April 1998.

   The Gnome Top Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public License as
   published by the Free Software Foundation; either version 2 of the
   License, or (at your option) any later version.

   The Gnome Top 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
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with the GNU C Library; see the file COPYING.LIB.  If not,
   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

#include <glibtop.h>
#include <glibtop/shm_limits.h>

/* #define KERNEL to get declaration of `struct shminfo'. */

#define KERNEL

#include <sys/ipc.h>
#include <sys/shm.h>

static unsigned long _glibtop_sysdeps_shm_limits =
(1 << GLIBTOP_IPC_SHMMAX) + (1 << GLIBTOP_IPC_SHMMIN) +
(1 << GLIBTOP_IPC_SHMMNI) + (1 << GLIBTOP_IPC_SHMSEG) +
(1 << GLIBTOP_IPC_SHMALL);

/* Provides information about sysv ipc limits. */

void
glibtop_get_shm_limits_p (glibtop *server, glibtop_shm_limits *buf)
{
	struct shminfo	shminfo;
  
	glibtop_init_r (&server, 0, 0);

	memset (buf, 0, sizeof (glibtop_shm_limits));
  
	/* !!! THE FOLLOWING CODE RUNS SGID KMEM - CHANGE WITH CAUTION !!! */
	
	setregid (server->machine.gid, server->machine.egid);
	
	/* get the load average array */

	(void) _glibtop_getkval (server, _glibtop_nlist [X_SHMINFO].n_value,
				 (int *) &shminfo, sizeof (shminfo),
				 _glibtop_nlist [X_SHMINFO].n_name);

	if (setregid (server->machine.egid, server->machine.gid))
		_exit (1);
	
	/* !!! END OF SGID KMEM PART !!! */

  	buf->shmmax = shminfo.shmmax;
	buf->shmmin = shminfo.shmmin;
	buf->shmmni = shminfo.shmmni;
	buf->shmseg = shminfo.shmseg;
	buf->shmall = shminfo.shmall;

	buf->flags = _glibtop_sysdeps_shm_limits;
}