xref: /csrg-svn/usr.bin/ktrace/ktrace.c (revision 69074)

/*-
 * Copyright (c) 1988, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * %sccs.include.redist.c%
 */

#ifndef lint
static char copyright[] =
"@(#) Copyright (c) 1988, 1993\n\
	The Regents of the University of California.  All rights reserved.\n";
#endif /* not lint */

#ifndef lint
static char sccsid[] = "@(#)ktrace.c	8.2 (Berkeley) 04/28/95";
#endif /* not lint */

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

#include <err.h>
#include <stdio.h>
#include <unistd.h>

#include "ktrace.h"

void no_ktrace __P((int));
void usage __P((void));

main(argc, argv)
	int argc;
	char **argv;
{
	enum { NOTSET, CLEAR, CLEARALL } clear;
	int append, ch, fd, inherit, ops, pid, pidset, trpoints;
	char *tracefile;

	clear = NOTSET;
	append = ops = pidset = inherit = 0;
	trpoints = DEF_POINTS;
	tracefile = DEF_TRACEFILE;
	while ((ch = getopt(argc,argv,"aCcdf:g:ip:t:")) != EOF)
		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)
		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, tracefile);
		exit(0);
	}

	if ((fd = open(tracefile, O_CREAT | O_WRONLY | (append ? 0 : O_TRUNC),
	    DEFFILEMODE)) < 0)
		err(1, tracefile);
	(void)close(fd);

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

rpid(p)
	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));
}

void
usage()
{
	(void)fprintf(stderr,
"usage:\tktrace [-aCcid] [-f trfile] [-g pgid] [-p pid] [-t [acgn]\n\tktrace [-aCcid] [-f trfile] [-t [acgn] command\n");
	exit(1);
}

void
no_ktrace(sig)
        int sig;
{
        (void)fprintf(stderr,
"error:\tktrace() system call not supported in the running kernel\n\tre-compile kernel with 'options KTRACE'\n");
        exit(1);
}