util.c

早期freebsd实现

/*
 * Copyright (c) 1992, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef lint
static char sccsid[] = "@(#)util.c	8.1 (Berkeley) 6/6/93";
#endif /* not lint */

#include <sys/types.h>

#include <errno.h>
#include <kvm.h>
#include <nlist.h>
#include <stdio.h>
#include <stdlib.h>
#if __STDC__
#include <stdarg.h>
#else
#include <varargs.h>
#endif

#include "extern.h"

/*
 * kvm_nlist, but with error exits.
 */
void
knlist(nl)
	struct nlist *nl;
{
	int nmissing;

	if ((nmissing = kvm_nlist(kd, nl)) == 0)
		return;
	if (nmissing < 0)
		errexit("kvm_nlist: %s\n", kvm_geterr(kd));
	(void)fprintf(stderr, "vmstat: undefined symbols:");
	for (; nl->n_name && *nl->n_name; nl++)
		if (nl->n_type == 0)
			printf(" %s", nl->n_name);
	(void)fputc('\n', stderr);
	exit(1);
}

/*
 * kread reads something from the kernel, given its address.
 * It aborts on failure.
 */
void
kread(addr, buf, size, err)
	u_long addr;
	void *buf;
	size_t size;
	char *err;
{

	if (kvm_read(kd, addr, buf, size) != size)
		errexit("kvm_read(%s): %s\n", err, kvm_geterr(kd));
}

void
#if __STDC__
errexit(const char *fmt, ...)
#else
errexit(fmt, va_alist)
	char *fmt;
	va_dcl
#endif
{
	va_list ap;

#if __STDC__
	va_start(ap, fmt);
#else
	va_start(ap);
#endif
	(void)fprintf(stderr, "vmstat: ");
	(void)vfprintf(stderr, fmt, ap);
	va_end(ap);
	exit(1);
	/* NOTREACHED */
}