msg_limits.c

来自「linux 操作系统下对系统资源监控程序的编写」· C语言 代码 · 共 76 行

/* $Id: msg_limits.c,v 1.14 2003/10/19 16:55:56 carlos Exp $ */

/* Copyright (C) 1998-99 Martin Baulig
   This file is part of LibGTop 1.0.

   Contributed by Martin Baulig <[e-mail]>, April 1998.

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

   LibGTop 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 General Public License
   for more details.

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

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

#include <glibtop_suid.h>

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

#define KERNEL

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

static const unsigned long _glibtop_sysdeps_msg_limits =
(1 << GLIBTOP_IPC_MSGMAP) + (1 << GLIBTOP_IPC_MSGMAX) +
(1 << GLIBTOP_IPC_MSGMNB) + (1 << GLIBTOP_IPC_MSGMNI) +
(1 << GLIBTOP_IPC_MSGSSZ) + (1 << GLIBTOP_IPC_MSGTQL);

/* Provides information about sysv ipc limits. */

void
glibtop_get_msg_limits_p (glibtop *server, glibtop_msg_limits *buf)
{
	struct msginfo	msginfo;
  
	glibtop_init_p (server, (1 << GLIBTOP_SYSDEPS_MSG_LIMITS), 0);

	memset (buf, 0, sizeof (glibtop_msg_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_MSGINFO].n_value,
				 (int *) &msginfo, sizeof (msginfo),
				 _glibtop_nlist [X_MSGINFO].n_name);

	if (setregid (server->machine.egid, server->machine.gid))
		_exit (1);
	
	/* !!! END OF SGID KMEM PART !!! */
  
	buf->msgmap = msginfo.msgmap;
	buf->msgmax = msginfo.msgmax;
	buf->msgmnb = msginfo.msgmnb;
	buf->msgmni = msginfo.msgmni;
	buf->msgssz = msginfo.msgssz;
	buf->msgtql = msginfo.msgtql;

	buf->flags = _glibtop_sysdeps_msg_limits;
}