sem_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 87 行

/* $Id: sem_limits.c,v 1.16 2003/10/19 16:55:39 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/sem_limits.h>

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

#ifdef _SEM_SEMUN_UNDEFINED

/* glibc 2.1 will no longer defines semun, instead it defines
 * _SEM_SEMUN_UNDEFINED so users can define semun on their own.
 * Thanks to Albert K T Hui <[e-mail]>. */

union semun
{
	int val;
	struct semid_ds *buf;
	unsigned short int *array;
	struct seminfo *__buf;
};
#endif

static unsigned long _glibtop_sysdeps_sem_limits =
(1L << GLIBTOP_IPC_SEMMAP) + (1L << GLIBTOP_IPC_SEMMNI) +
(1L << GLIBTOP_IPC_SEMMNS) + (1L << GLIBTOP_IPC_SEMMNU) +
(1L << GLIBTOP_IPC_SEMMSL) + (1L << GLIBTOP_IPC_SEMOPM) +
(1L << GLIBTOP_IPC_SEMUME) + (1L << GLIBTOP_IPC_SEMUSZ) +
(1L << GLIBTOP_IPC_SEMVMX) + (1L << GLIBTOP_IPC_SEMAEM);

/* Init function. */

void
glibtop_init_sem_limits_s (glibtop *server)
{
	server->sysdeps.sem_limits = _glibtop_sysdeps_sem_limits;
}

/* Provides information about sysv ipc limits. */

void
glibtop_get_sem_limits_s (glibtop *server, glibtop_sem_limits *buf)
{
	struct seminfo	seminfo;
	union semun	arg;  
  
	glibtop_init_s (&server, GLIBTOP_SYSDEPS_SEM_LIMITS, 0);

	memset (buf, 0, sizeof (glibtop_sem_limits));
  
	buf->flags = _glibtop_sysdeps_sem_limits;
  
	arg.array = (ushort *) &seminfo;
	semctl (0, 0, IPC_INFO, arg);
  
	buf->semmap = seminfo.semmap;
	buf->semmni = seminfo.semmni;
	buf->semmns = seminfo.semmns;
	buf->semmnu = seminfo.semmnu;
	buf->semmsl = seminfo.semmsl;
	buf->semopm = seminfo.semopm;
	buf->semume = seminfo.semume;
	buf->semusz = seminfo.semusz;
	buf->semvmx = seminfo.semvmx;
	buf->semaem = seminfo.semaem;
}