shm_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 90 行

/* $Id: shm_limits.c,v 1.14 2003/10/19 16:55:43 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/error.h>
#include <glibtop/shm_limits.h>

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

/* Init function. */

void
glibtop_init_shm_limits_s (glibtop *server)
{
	server->sysdeps.shm_limits = _glibtop_sysdeps_shm_limits;
}

/* Provides information about sysv ipc limits. */

void
glibtop_get_shm_limits_s (glibtop *server, glibtop_shm_limits *buf)
{
	int ret, value;

	glibtop_init_s (&server, 0, 0);

	memset (buf, 0, sizeof (glibtop_shm_limits));
	
	ret = table (TBL_SHMINFO, SHMINFO_MAX, (char *) &value, 1,
		     sizeof (value)); 

	if (ret != 1) return;

	buf->flags += (1L << GLIBTOP_IPC_SHMMAX);
		
	buf->shmmax = value;
	

	ret = table (TBL_SHMINFO, SHMINFO_MIN, (char *) &value, 1,
		     sizeof (value)); 

	if (ret != 1) return;
		
	buf->flags += (1L << GLIBTOP_IPC_SHMMIN);
		
	buf->shmmin = value;
	

	ret = table (TBL_SHMINFO, SHMINFO_MNI, (char *) &value, 1,
		     sizeof (value)); 

	if (ret != 1) return;
		
	buf->flags += (1L << GLIBTOP_IPC_SHMMNI);
		
	buf->shmmni = value;
	

	ret = table (TBL_SHMINFO, SHMINFO_SEG, (char *) &value, 1,
		     sizeof (value)); 

	if (ret != 1) return;
		
	buf->flags += (1L << GLIBTOP_IPC_SHMSEG);
		
	buf->shmseg = value;
}