diff options
Diffstat (limited to 'sbin/mount_null/mount_null.c')
| -rw-r--r-- | sbin/mount_null/mount_null.c | 145 |
1 files changed, 145 insertions, 0 deletions
diff --git a/sbin/mount_null/mount_null.c b/sbin/mount_null/mount_null.c new file mode 100644 index 000000000000..e78c3fc8ea3c --- /dev/null +++ b/sbin/mount_null/mount_null.c @@ -0,0 +1,145 @@ +/* + * Copyright (c) 1992, 1993, 1994 + * The Regents of the University of California. All rights reserved. + * + * This code is derived from software donated to Berkeley by + * Jan-Simon Pendry. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#ifndef lint +char copyright[] = +"@(#) Copyright (c) 1992, 1993, 1994\n\ + The Regents of the University of California. All rights reserved.\n"; +#endif /* not lint */ + +#ifndef lint +/* +static char sccsid[] = "@(#)mount_null.c 8.5 (Berkeley) 3/27/94"; +*/ +static const char rcsid[] = + "$Id: mount_null.c,v 1.4 1996/05/13 17:43:08 wollman Exp $"; +#endif /* not lint */ + +#include <sys/param.h> +#include <sys/mount.h> +#include <miscfs/nullfs/null.h> + +#include <err.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <sysexits.h> +#include <unistd.h> + +#include "mntopts.h" + +struct mntopt mopts[] = { + MOPT_STDOPTS, + { NULL } +}; + +int subdir __P((const char *, const char *)); +static void usage __P((void)) __dead2; + +int +main(argc, argv) + int argc; + char *argv[]; +{ + struct null_args args; + int ch, mntflags; + char target[MAXPATHLEN]; + struct vfsconf *vfc; + + mntflags = 0; + while ((ch = getopt(argc, argv, "o:")) != EOF) + switch(ch) { + case 'o': + getmntopts(optarg, mopts, &mntflags, 0); + break; + case '?': + default: + usage(); + } + argc -= optind; + argv += optind; + + if (argc != 2) + usage(); + + if (realpath(argv[0], target) == 0) + err(EX_OSERR, "%s", target); + + if (subdir(target, argv[1]) || subdir(argv[1], target)) + errx(EX_USAGE, "%s (%s) and %s are not distinct paths", + argv[0], target, argv[1]); + + args.target = target; + + vfc = getvfsbyname("null"); + if(!vfc && vfsisloadable("null")) { + if(vfsload("null")) + err(EX_OSERR, "vfsload(null)"); + endvfsent(); /* flush cache */ + vfc = getvfsbyname("null"); + } + if (!vfc) + errx(EX_OSERR, "null filesystem is not available"); + + if (mount(vfc->vfc_index, argv[1], mntflags, &args)) + err(EX_OSERR, target); + exit(0); +} + +int +subdir(p, dir) + const char *p; + const char *dir; +{ + int l; + + l = strlen(dir); + if (l <= 1) + return (1); + + if ((strncmp(p, dir, l) == 0) && (p[l] == '/' || p[l] == '\0')) + return (1); + + return (0); +} + +static void +usage() +{ + (void)fprintf(stderr, + "usage: mount_null [-o options] target_fs mount_point\n"); + exit(1); +} |