bug fixes for LEASES from Rick Macklem

[unix-history] / usr / src / usr.sbin / chroot / chroot.c

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

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

#ifndef lint
static char sccsid[] = "@(#)chroot.c	5.9 (Berkeley) %G%";
#endif /* not lint */

#include <sys/types.h>

#include <errno.h>
#include <paths.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

void fatal __P((char *));
void usage __P((void));

int
main(argc, argv)
	int argc;
	char *argv[];
{
	int ch;
	char *shell;

	while ((ch = getopt(argc, argv, "")) != EOF)
		switch(ch) {
		case '?':
		default:
			usage();
		}
	argc -= optind;
	argv += optind;

	if (argc < 2)
		usage();

	if (chdir(argv[1]) || chroot("."))
		fatal(argv[1]);
	if (argv[2]) {
		execvp(argv[2], &argv[2]);
		fatal(argv[2]);
	} else {
		if (!(shell = getenv("SHELL")))
			shell = _PATH_BSHELL;
		execlp(shell, shell, "-i", (char *)NULL);
		fatal(shell);
	}
	/* NOTREACHED */
}

void
fatal(msg)
	char *msg;
{
	(void)fprintf(stderr, "chroot: %s: %s\n", msg, strerror(errno));
	exit(1);
}

void
usage()
{
	(void)fprintf(stderr, "usage: chroot newroot [command]\n");
	exit(1);
}