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rcsid[] and sccsid[] and copyright[] are essentially unmaintained (and
unmaintainable).  these days, people use source.  these id's do not provide
any benefit, and do hurt the small install media
(the 33,000 line diff is essentially mechanical)
ok with the idea millert, ok dms

/*	$OpenBSD: ktrace.c,v 1.22 2009/10/27 23:59:39 deraadt Exp $	*/
/*	$NetBSD: ktrace.c,v 1.4 1995/08/31 23:01:44 jtc Exp $	*/

/*-
 * Copyright (c) 1988, 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. 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.
 */

#include <sys/param.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/uio.h>
#include <sys/ktrace.h>

#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>

#include "ktrace.h"
#include "extern.h"

static int rpid(const char *);
static void no_ktrace(int);
static void usage(void);

int
main(int argc, char *argv[])
{
	enum { NOTSET, CLEAR, CLEARALL } clear;
	int append, ch, fd, inherit, ops, pidset, trpoints;
	pid_t pid;
	char *tracefile;
	mode_t omask;
	struct stat sb;

	clear = NOTSET;
	append = ops = pidset = inherit = pid = 0;
	trpoints = DEF_POINTS;
	tracefile = DEF_TRACEFILE;
	while ((ch = getopt(argc,argv,"aCcdf:g:ip:t:")) != -1)
		switch((char)ch) {
		case 'a':
			append = 1;
			break;
		case 'C':
			clear = CLEARALL;
			pidset = 1;
			break;
		case 'c':
			clear = CLEAR;
			break;
		case 'd':
			ops |= KTRFLAG_DESCEND;
			break;
		case 'f':
			tracefile = optarg;
			break;
		case 'g':
			pid = -rpid(optarg);
			pidset = 1;
			break;
		case 'i':
			inherit = 1;
			break;
		case 'p':
			pid = rpid(optarg);
			pidset = 1;
			break;
		case 't':
			trpoints = getpoints(optarg);
			if (trpoints < 0) {
				warnx("unknown facility in %s", optarg);
				usage();
			}
			break;
		default:
			usage();
		}
	argv += optind;
	argc -= optind;
	
	if ((pidset && *argv) || (!pidset && !*argv && clear != CLEAR))
		usage();
			
	if (inherit)
		trpoints |= KTRFAC_INHERIT;

	(void)signal(SIGSYS, no_ktrace);
	if (clear != NOTSET) {
		if (clear == CLEARALL) {
			ops = KTROP_CLEAR | KTRFLAG_DESCEND;
			trpoints = ALL_POINTS;
			pid = 1;
		} else
			ops |= pid ? KTROP_CLEAR : KTROP_CLEARFILE;

		if (ktrace(tracefile, ops, trpoints, pid) < 0)
			err(1, "%s", tracefile);
		exit(0);
	}

	omask = umask(S_IRWXG|S_IRWXO);
	if (append) {
		if ((fd = open(tracefile, O_CREAT | O_WRONLY, DEFFILEMODE)) < 0)
			err(1, "%s", tracefile);
		if (fstat(fd, &sb) != 0 || sb.st_uid != getuid())
			errx(1, "Refuse to append to %s: not owned by you.",
			    tracefile);
	} else {
		if (unlink(tracefile) == -1 && errno != ENOENT)
			err(1, "unlink %s", tracefile);
		if ((fd = open(tracefile, O_CREAT | O_EXCL | O_WRONLY,
		    DEFFILEMODE)) < 0)
			err(1, "%s", tracefile);
	}
	(void)umask(omask);
	(void)close(fd);

	if (*argv) { 
		if (ktrace(tracefile, ops, trpoints, getpid()) < 0)
			err(1, "%s", tracefile);
		execvp(argv[0], &argv[0]);
		err(1, "exec of '%s' failed", argv[0]);
	}
	else if (ktrace(tracefile, ops, trpoints, pid) < 0)
		err(1, "%s", tracefile);
	exit(0);
}

static int
rpid(const char *p)
{
	static int first;

	if (first++) {
		warnx("only one -g or -p flag is permitted.");
		usage();
	}
	if (!*p) {
		warnx("illegal process id.");
		usage();
	}
	return(atoi(p));
}

static void
usage(void)
{
	(void)fprintf(stderr,
	    "usage: ktrace [-aCcdi] [-f trfile] [-g pgid] [-p pid] [-t trstr]\n"
	    "       ktrace [-adi] [-f trfile] [-t trstr] command\n");
	exit(1);
}

/* ARGSUSED */
static void
no_ktrace(int signo)
{
	char buf[8192];

	snprintf(buf, sizeof(buf),
"error:\tktrace() system call not supported in the running kernel\n\tre-compile kernel with 'option KTRACE'\n");
	write(STDERR_FILENO, buf, strlen(buf));
	_exit(1);
}