usr/src/sbin/mount_null/mount_null.c

/*
 * Copyright (c) 1992, 1993
 *      The Regents of the University of California.  All rights reserved.
 * All rights reserved.
 *
 * This code is derived from software donated to Berkeley by
 * Jan-Simon Pendry.
 *
 * %sccs.include.redist.c%
 *
 *      @(#)mount_null.c        8.1 (Berkeley) %G%
 */

#include <sys/param.h>
#include <sys/mount.h>
#include <miscfs/nullfs/null.h>

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

void usage __P((void));

int
main(argc, argv)
        int argc;
        char *argv[];
{
        struct null_args args;
        int ch, mntflags;

        mntflags = 0;
        while ((ch = getopt(argc, argv, "F:")) != EOF)
                switch(ch) {
                case 'F':
                        mntflags = atoi(optarg);
                        break;
                case '?':
                default:
                        usage();
                }
        argc -= optind;
        argv += optind;

        if (argc != 2)
                usage();

        args.target = argv[0];

        if (mount(MOUNT_NULL, argv[1], mntflags, &args)) {
                (void)fprintf(stderr, "mount_null: %s\n", strerror(errno));
                exit(1);
        }
        exit(0);
}

void
usage()
{
        (void)fprintf(stderr,
            "usage: mount_null [ -F fsoptions ] target_fs mount_point\n");
        exit(1);
}