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Power 6/32 Unix version 1.21

/*
 * This program echoes the output of kernel printf().
 * For more information, see kprf(1).
 *
 * 12/16/85	Initial version
 */


#include <sys/types.h>
#include <sys/socket.h>
#define	KPRF
#include <sys/prf.h>
#include <sys/ioctl.h>
#include <stdio.h>


int	cflag,
	pflag;

char	*pgname;


/*
 * Print the usage message and exit.
 */
usage()
{
	printf ("%s: usage: %s [-cp]\n", pgname, pgname);
	printf ("-c\tdirect output to console\n");
	printf ("-p\tdirect output to process\n");
	exit (1);
}


/*
 * Main routine.
 */
main(argc, argv)
int	argc;
char	*argv[];
{
	int	i;
	int	stat;
	int	fd;
	char	*cp;
	char	buf[1024*4];	/* size of message buffer at end of core */

	pgname = argv[0];

	if (argc == 1)
		usage();
	while (--argc > 0 && **++argv == '-') {
		for (cp = *argv+1; *cp; cp++)
		switch (*cp) {
		case 'c':
			cflag++;
			fd = pflag ? KPRF_TRACEC : URGCONS;
			break;
		case 'p':
			pflag++;
			fd = cflag ? KPRF_TRACEC : KPRF_TRACE;
			break;
		default:
			usage();
		}
	}

	i = socket(SOCK_STREAM, AF_UNIX, 0);
	if (i < 0)
		fatal("Cannot create socket");

	stat = ioctl(i, SIOCTRACE, (char *) &fd);
	if (stat < 0)
		fatal("Cannot start trace utilities");

	setbuf(stdout, (char *)0);
	for (;;) {
		stat = read(i, buf, sizeof(buf)-1);
		if (stat <= 0)
			fatal("EOF or error in read");
		buf[stat] = 0;
		printf("%s", buf);
	}

	/*NOTREACHED*/
	exit(0);		/* should not get here */
}


/*
 * A fatal error occured.
 * Print the error message and exit.
 */
fatal(msg)
char	*msg;
{
	fprintf(stderr, "%s: ", pgname);
	perror(msg);
	exit(1);
}

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