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Annotation of 43BSDReno/usr.sbin/chroot/chroot.c, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 1988 The Regents of the University of California.
                      3:  * All rights reserved.
                      4:  *
                      5:  * Redistribution and use in source and binary forms are permitted provided
                      6:  * that: (1) source distributions retain this entire copyright notice and
                      7:  * comment, and (2) distributions including binaries display the following
                      8:  * acknowledgement:  ``This product includes software developed by the
                      9:  * University of California, Berkeley and its contributors'' in the
                     10:  * documentation or other materials provided with the distribution and in
                     11:  * all advertising materials mentioning features or use of this software.
                     12:  * Neither the name of the University nor the names of its contributors may
                     13:  * be used to endorse or promote products derived from this software without
                     14:  * specific prior written permission.
                     15:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
                     16:  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
                     17:  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
                     18:  */
                     19: 
                     20: #ifndef lint
                     21: char copyright[] =
                     22: "@(#) Copyright (c) 1988 The Regents of the University of California.\n\
                     23:  All rights reserved.\n";
                     24: #endif /* not lint */
                     25: 
                     26: #ifndef lint
                     27: static char sccsid[] = "@(#)chroot.c   5.8 (Berkeley) 6/1/90";
                     28: #endif /* not lint */
                     29: 
                     30: #include <stdio.h>
                     31: #include <paths.h>
                     32: 
                     33: main(argc, argv)
                     34:        int argc;
                     35:        char **argv;
                     36: {
                     37:        extern int errno;
                     38:        char *shell, *getenv(), *strerror();
                     39: 
                     40:        if (argc < 2) {
                     41:                (void)fprintf(stderr, "usage: chroot newroot [command]\n");
                     42:                exit(1);
                     43:        }
                     44:        if (chdir(argv[1]) || chroot("."))
                     45:                fatal(argv[1]);
                     46:        if (argv[2]) {
                     47:                execvp(argv[2], &argv[2]);
                     48:                fatal(argv[2]);
                     49:        } else {
                     50:                if (!(shell = getenv("SHELL")))
                     51:                        shell = _PATH_BSHELL;
                     52:                execlp(shell, shell, "-i", (char *)NULL);
                     53:                fatal(shell);
                     54:        }
                     55:        /* NOTREACHED */
                     56: }
                     57: 
                     58: fatal(msg)
                     59:        char *msg;
                     60: {
                     61:        extern int errno;
                     62: 
                     63:        (void)fprintf(stderr, "chroot: %s: %s\n", msg, strerror(errno));
                     64:        exit(1);
                     65: }

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