Add rcsid. Remove unused #includes. Use err(3) and check spelling. Reorganize
man page.
This commit is contained in:
Philippe Charnier
parent
750f6fe391
commit
61d20ca30f
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=37278
@ -1,40 +1,31 @@
|
||||
.\" $Id: nextboot.8,v 1.6 1997/02/22 14:32:31 peter Exp $
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.\" $Id: nextboot.8,v 1.7 1997/04/23 04:46:38 danny Exp $
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.Dd July 9, 1996
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.Dt NEXTBOOT 8
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.\".Os BSD 4
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.Sh NAME
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.Nm nextboot
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.Nd Install a default bootstring block on the boot disk
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.Nd install a default bootstring block on the boot disk
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.Sh SYNOPSIS
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.Nm
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.Nm nextboot
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.Op Fl b
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.Ar filename bootstring ...
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.Pp
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.Nm
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.Ar filename bootstring
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.Ar
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.Nm nextboot
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.Op Fl ed
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.Ar filename
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.Bl -tag -width time
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.It Fl b
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Is used for bootstrapping (initially configuring) the nameblock. Without
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this,
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.Nm
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||||
will refuse to write to a block that does not already contain the magic
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||||
number.
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.It Fl d
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||||
temporarily disables an existing name block by changing a bit
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in the magic number.
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.It Fl e
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restores the good magic number on a block disabled by -d.
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.El
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.Sh PROLOGUE
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The FreeBSD program
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.Sh DESCRIPTION
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||||
The
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||||
.Bx Free
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||||
program
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||||
.Nm
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||||
controls the actions of the boot blocks at the time of the next boot.
|
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If compiled with the correct option,
|
||||
the boot blocks will check the nameblock for a magic number and a
|
||||
default name to use for booting. If compiled to do so they will also
|
||||
delete the name from the block, ensuring that if the boot should fail,
|
||||
then it will not be tried again. It is the job of /etc/rc to use
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then it will not be tried again. It is the job of
|
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.Pa /etc/rc
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||||
to use
|
||||
.Nm
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||||
to re-install the string if that boot is found to have succeeded.
|
||||
This allows a one-time only boot string to be used for such applications
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@ -42,8 +33,29 @@ as remote debugging, and installation of new, untrusted kernels.
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The nameblock is defined at compile time to be the second physical block
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on the disk.
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.Pp
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.Sh DESCRIPTION
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||||
The following options are available:
|
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.Bl -tag -width indent
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||||
.It Fl b
|
||||
Is used for bootstrapping (initially configuring) the nameblock. Without
|
||||
this,
|
||||
.Nm
|
||||
will refuse to write to a block that does not already contain the magic
|
||||
number.
|
||||
.It Fl d
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||||
Disable (temporarily) an existing name block by changing a bit
|
||||
in the magic number.
|
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.It Fl e
|
||||
Restore the good magic number on a block disabled by
|
||||
.Fl d .
|
||||
.El
|
||||
.Pp
|
||||
The
|
||||
.Fl e
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||||
and
|
||||
.Fl d
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||||
flags are mutually exclusive.
|
||||
.Sh DESCRIPTION
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||||
.Nm Nextboot
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||||
first checks that the disk has an fdisk table and checks that none of the
|
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partitions defined in that table include the nameblock. If the name block is
|
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shown to be unused, it will install the bootstrings given as arguments,
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@ -61,18 +73,20 @@ An example of usage might be:
|
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.Ed
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||||
.Pp
|
||||
Which would instruct the boot blocks at the next boot,
|
||||
to try boot the experimental kernel off the scsi disk.
|
||||
to try boot the experimental kernel off the SCSI disk.
|
||||
If for any reason this failed, the next boot attempt would
|
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boot the kernel
|
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.Em /kernel.old
|
||||
off the IDE drive. (assuming the write-back option were enabled) If this
|
||||
in turn failed. the compiled in default would be used.
|
||||
.Pa /kernel.old
|
||||
off the IDE drive. (Assuming the write-back option were enabled) If this
|
||||
in turn failed. The compiled in default would be used.
|
||||
.Pp
|
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If the write-back feature is disabled, the nextboot program is a convenient way
|
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to change the default boot string. Note, that should the file specified in
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the nameblock be non-existent, then the name compiled into the boot blocks
|
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will be used for the boot rather than the next name in the nameblock. The
|
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nameblock is only consulted ONCE per boot.
|
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nameblock is only consulted
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.Em once
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per boot.
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.Sh SEE ALSO
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.Xr boot 8 ,
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.Xr disklabel 8 ,
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@ -1,4 +1,3 @@
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/*
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* Copyright (c) 1996 Whistle Communications
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* All Rights Reserved.
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@ -14,22 +13,22 @@
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* any damages whatsoever resulting from the use of this software.
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*/
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#ifndef lint
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static const char rcsid[] =
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"$Id$";
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#endif /* not lint */
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#include <sys/types.h>
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#include <sys/disklabel.h>
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#include <fcntl.h>
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#include <err.h>
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#include <sys/stat.h>
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#include <sys/ioctl.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <unistd.h>
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struct mboot
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{
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unsigned char padding[2]; /* force the longs to be long alligned */
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unsigned char padding[2]; /* force the longs to be long aligned */
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unsigned char bootinst[DOSPARTOFF];
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struct dos_partition parts[4];
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unsigned short int signature;
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@ -43,20 +42,18 @@ struct mboot mboot;
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static int bflag;
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static int eflag;
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static int dflag;
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static int nameblock = NAMEBLOCK;
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#define BOOT_MAGIC 0xAA55
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extern char *__progname;
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static void usage(void) {
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fprintf (stderr, " usage: %s [-b] device bootstring [bootstring] ...\n"
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, __progname);
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fprintf (stderr, " or: %s {-e,-d} device \n" , __progname);
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fprintf (stderr, "The -e and -d flags are mutually exclusive\n");
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static void
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usage(void) {
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fprintf (stderr, "%s\n%s\n",
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"usage: nextboot [-b] device bootstring [bootstring] ...",
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" nextboot {-e,-d} device");
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exit(1);
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}
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int
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main (int argc, char** argv)
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{
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int fd = -1;
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@ -97,11 +94,8 @@ main (int argc, char** argv)
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usage();
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}
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}
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if ((fd = open(argv[0], O_RDWR, 0)) < 0) {
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perror("open");
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printf ("file: %s\n",argv[0]);
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usage();
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}
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if ((fd = open(argv[0], O_RDWR, 0)) < 0)
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errx(1, "can't open %s", argv[0]);
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argc--;
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argv++;
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@ -109,18 +103,12 @@ main (int argc, char** argv)
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/*******************************************
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* Check that we have an MBR
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*/
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if (lseek(fd,0,0) == -1) {
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perror("lseek");
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exit(1);
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}
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if (read (fd,&mboot.bootinst[0],BLOCKSIZE ) != BLOCKSIZE) {
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perror("read0");
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exit(1);
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}
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if(mboot.signature != (unsigned short)BOOT_MAGIC) {
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printf(" no fdisk part.. not touching block 1\n");
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exit(1);
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}
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if (lseek(fd,0,0) == -1)
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err(1, "lseek");
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if (read (fd,&mboot.bootinst[0],BLOCKSIZE ) != BLOCKSIZE)
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err(1, "read0");
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if (mboot.signature != (unsigned short)BOOT_MAGIC)
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errx(1, "no fdisk part.. not touching block 1");
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/*******************************************
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* And check that none of the partitions in it cover the name block;
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@ -129,28 +117,22 @@ main (int argc, char** argv)
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if( mboot.parts[part].dp_size
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&& (mboot.parts[part].dp_start <= NAMEBLOCK)
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&& (mboot.parts[part].dp_start
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+ mboot.parts[part].dp_size > NAMEBLOCK)) {
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printf(" Name sector lies within a Bios partition.\n");
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printf(" Aborting write.\n");
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exit(1);
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}
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+ mboot.parts[part].dp_size > NAMEBLOCK))
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errx(1,
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"name sector lies within a Bios partition: aborting write");
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}
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/*******************************************
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* Now check the name sector itself to see if it's been initialised.
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* Now check the name sector itself to see if it's been initialized.
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*/
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if (lseek(fd,NAMEBLOCK * BLOCKSIZE,0) == -1) {
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perror("lseek");
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exit(1);
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}
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if ( read (fd,namebuf,BLOCKSIZE ) != BLOCKSIZE) {
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perror("read1");
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exit(1);
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}
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if (lseek(fd,NAMEBLOCK * BLOCKSIZE,0) == -1)
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err(1, "lseek");
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if (read(fd,namebuf,BLOCKSIZE) != BLOCKSIZE)
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err(1, "read1");
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/*******************************************
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* check if we are just enabling or disabling
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* Remember the flags are exlusive..
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* Remember the flags are exclusive..
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*/
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if(!bflag) { /* don't care what's there if bflag is set */
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switch(*(unsigned long *)cp)
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@ -159,10 +141,7 @@ main (int argc, char** argv)
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case ENABLE_MAGIC:
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break;
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default:
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fprintf(stderr,
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"namesector not initialised.."
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"use the -b flag..\n");
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exit(1);
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errx(1, "namesector not initialized, use the -b flag");
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}
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}
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@ -199,24 +178,18 @@ main (int argc, char** argv)
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/*******************************************
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* write it to disk.
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*/
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if (lseek(fd,NAMEBLOCK * BLOCKSIZE,0) == -1) {
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perror("lseek");
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exit(1);
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}
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if(write (fd,namebuf,BLOCKSIZE ) != BLOCKSIZE) {
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perror("write");
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exit(1);
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}
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if (lseek(fd,NAMEBLOCK * BLOCKSIZE,0) == -1)
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err(1, "lseek");
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if(write (fd,namebuf,BLOCKSIZE ) != BLOCKSIZE)
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err(1, "write");
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#if 0
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/*******************************************
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* just to be safe/paranoid.. read it back..
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* and print it..
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*/
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if (lseek(fd,NAMEBLOCK * BLOCKSIZE,0) == -1) {
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perror("lseek (second) ");
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exit(1);
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}
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if (lseek(fd,NAMEBLOCK * BLOCKSIZE,0) == -1)
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err(1, "lseek (second)");
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read (fd,namebuf,512);
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for (i = 0;i< 16;i++) {
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for ( j = 0; j < 16; j++) {
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@ -227,5 +200,3 @@ main (int argc, char** argv)
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#endif
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exit(0);
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}
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@ -1,40 +1,31 @@
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.\" $Id: nextboot.8,v 1.6 1997/02/22 14:32:31 peter Exp $
|
||||
.\" $Id: nextboot.8,v 1.7 1997/04/23 04:46:38 danny Exp $
|
||||
.Dd July 9, 1996
|
||||
.Dt NEXTBOOT 8
|
||||
.\".Os BSD 4
|
||||
.Sh NAME
|
||||
.Nm nextboot
|
||||
.Nd Install a default bootstring block on the boot disk
|
||||
.Nd install a default bootstring block on the boot disk
|
||||
.Sh SYNOPSIS
|
||||
.Nm
|
||||
.Nm nextboot
|
||||
.Op Fl b
|
||||
.Ar filename bootstring ...
|
||||
.Pp
|
||||
.Nm
|
||||
.Ar filename bootstring
|
||||
.Ar
|
||||
.Nm nextboot
|
||||
.Op Fl ed
|
||||
.Ar filename
|
||||
.Bl -tag -width time
|
||||
.It Fl b
|
||||
Is used for bootstrapping (initially configuring) the nameblock. Without
|
||||
this,
|
||||
.Nm
|
||||
will refuse to write to a block that does not already contain the magic
|
||||
number.
|
||||
.It Fl d
|
||||
temporarily disables an existing name block by changing a bit
|
||||
in the magic number.
|
||||
.It Fl e
|
||||
restores the good magic number on a block disabled by -d.
|
||||
.El
|
||||
.Sh PROLOGUE
|
||||
The FreeBSD program
|
||||
.Sh DESCRIPTION
|
||||
The
|
||||
.Bx Free
|
||||
program
|
||||
.Nm
|
||||
controls the actions of the boot blocks at the time of the next boot.
|
||||
If compiled with the correct option,
|
||||
the boot blocks will check the nameblock for a magic number and a
|
||||
default name to use for booting. If compiled to do so they will also
|
||||
delete the name from the block, ensuring that if the boot should fail,
|
||||
then it will not be tried again. It is the job of /etc/rc to use
|
||||
then it will not be tried again. It is the job of
|
||||
.Pa /etc/rc
|
||||
to use
|
||||
.Nm
|
||||
to re-install the string if that boot is found to have succeeded.
|
||||
This allows a one-time only boot string to be used for such applications
|
||||
@ -42,8 +33,29 @@ as remote debugging, and installation of new, untrusted kernels.
|
||||
The nameblock is defined at compile time to be the second physical block
|
||||
on the disk.
|
||||
.Pp
|
||||
.Sh DESCRIPTION
|
||||
The following options are available:
|
||||
.Bl -tag -width indent
|
||||
.It Fl b
|
||||
Is used for bootstrapping (initially configuring) the nameblock. Without
|
||||
this,
|
||||
.Nm
|
||||
will refuse to write to a block that does not already contain the magic
|
||||
number.
|
||||
.It Fl d
|
||||
Disable (temporarily) an existing name block by changing a bit
|
||||
in the magic number.
|
||||
.It Fl e
|
||||
Restore the good magic number on a block disabled by
|
||||
.Fl d .
|
||||
.El
|
||||
.Pp
|
||||
The
|
||||
.Fl e
|
||||
and
|
||||
.Fl d
|
||||
flags are mutually exclusive.
|
||||
.Sh DESCRIPTION
|
||||
.Nm Nextboot
|
||||
first checks that the disk has an fdisk table and checks that none of the
|
||||
partitions defined in that table include the nameblock. If the name block is
|
||||
shown to be unused, it will install the bootstrings given as arguments,
|
||||
@ -61,18 +73,20 @@ An example of usage might be:
|
||||
.Ed
|
||||
.Pp
|
||||
Which would instruct the boot blocks at the next boot,
|
||||
to try boot the experimental kernel off the scsi disk.
|
||||
to try boot the experimental kernel off the SCSI disk.
|
||||
If for any reason this failed, the next boot attempt would
|
||||
boot the kernel
|
||||
.Em /kernel.old
|
||||
off the IDE drive. (assuming the write-back option were enabled) If this
|
||||
in turn failed. the compiled in default would be used.
|
||||
.Pa /kernel.old
|
||||
off the IDE drive. (Assuming the write-back option were enabled) If this
|
||||
in turn failed. The compiled in default would be used.
|
||||
.Pp
|
||||
If the write-back feature is disabled, the nextboot program is a convenient way
|
||||
to change the default boot string. Note, that should the file specified in
|
||||
the nameblock be non-existent, then the name compiled into the boot blocks
|
||||
will be used for the boot rather than the next name in the nameblock. The
|
||||
nameblock is only consulted ONCE per boot.
|
||||
nameblock is only consulted
|
||||
.Em once
|
||||
per boot.
|
||||
.Sh SEE ALSO
|
||||
.Xr boot 8 ,
|
||||
.Xr disklabel 8 ,
|
||||
|
||||
@ -1,4 +1,3 @@
|
||||
|
||||
/*
|
||||
* Copyright (c) 1996 Whistle Communications
|
||||
* All Rights Reserved.
|
||||
@ -14,22 +13,22 @@
|
||||
* any damages whatsoever resulting from the use of this software.
|
||||
*/
|
||||
|
||||
#ifndef lint
|
||||
static const char rcsid[] =
|
||||
"$Id$";
|
||||
#endif /* not lint */
|
||||
|
||||
#include <sys/types.h>
|
||||
#include <sys/disklabel.h>
|
||||
#include <fcntl.h>
|
||||
#include <err.h>
|
||||
#include <stdio.h>
|
||||
#include <string.h>
|
||||
#include <errno.h>
|
||||
#include <sys/stat.h>
|
||||
#include <sys/ioctl.h>
|
||||
#include <fcntl.h>
|
||||
#include <unistd.h>
|
||||
#include <stdlib.h>
|
||||
#include <unistd.h>
|
||||
|
||||
struct mboot
|
||||
{
|
||||
unsigned char padding[2]; /* force the longs to be long alligned */
|
||||
unsigned char padding[2]; /* force the longs to be long aligned */
|
||||
unsigned char bootinst[DOSPARTOFF];
|
||||
struct dos_partition parts[4];
|
||||
unsigned short int signature;
|
||||
@ -43,20 +42,18 @@ struct mboot mboot;
|
||||
static int bflag;
|
||||
static int eflag;
|
||||
static int dflag;
|
||||
static int nameblock = NAMEBLOCK;
|
||||
|
||||
#define BOOT_MAGIC 0xAA55
|
||||
|
||||
extern char *__progname;
|
||||
|
||||
static void usage(void) {
|
||||
fprintf (stderr, " usage: %s [-b] device bootstring [bootstring] ...\n"
|
||||
, __progname);
|
||||
fprintf (stderr, " or: %s {-e,-d} device \n" , __progname);
|
||||
fprintf (stderr, "The -e and -d flags are mutually exclusive\n");
|
||||
static void
|
||||
usage(void) {
|
||||
fprintf (stderr, "%s\n%s\n",
|
||||
"usage: nextboot [-b] device bootstring [bootstring] ...",
|
||||
" nextboot {-e,-d} device");
|
||||
exit(1);
|
||||
}
|
||||
|
||||
int
|
||||
main (int argc, char** argv)
|
||||
{
|
||||
int fd = -1;
|
||||
@ -97,11 +94,8 @@ main (int argc, char** argv)
|
||||
usage();
|
||||
}
|
||||
}
|
||||
if ((fd = open(argv[0], O_RDWR, 0)) < 0) {
|
||||
perror("open");
|
||||
printf ("file: %s\n",argv[0]);
|
||||
usage();
|
||||
}
|
||||
if ((fd = open(argv[0], O_RDWR, 0)) < 0)
|
||||
errx(1, "can't open %s", argv[0]);
|
||||
|
||||
argc--;
|
||||
argv++;
|
||||
@ -109,18 +103,12 @@ main (int argc, char** argv)
|
||||
/*******************************************
|
||||
* Check that we have an MBR
|
||||
*/
|
||||
if (lseek(fd,0,0) == -1) {
|
||||
perror("lseek");
|
||||
exit(1);
|
||||
}
|
||||
if (read (fd,&mboot.bootinst[0],BLOCKSIZE ) != BLOCKSIZE) {
|
||||
perror("read0");
|
||||
exit(1);
|
||||
}
|
||||
if(mboot.signature != (unsigned short)BOOT_MAGIC) {
|
||||
printf(" no fdisk part.. not touching block 1\n");
|
||||
exit(1);
|
||||
}
|
||||
if (lseek(fd,0,0) == -1)
|
||||
err(1, "lseek");
|
||||
if (read (fd,&mboot.bootinst[0],BLOCKSIZE ) != BLOCKSIZE)
|
||||
err(1, "read0");
|
||||
if (mboot.signature != (unsigned short)BOOT_MAGIC)
|
||||
errx(1, "no fdisk part.. not touching block 1");
|
||||
|
||||
/*******************************************
|
||||
* And check that none of the partitions in it cover the name block;
|
||||
@ -129,28 +117,22 @@ main (int argc, char** argv)
|
||||
if( mboot.parts[part].dp_size
|
||||
&& (mboot.parts[part].dp_start <= NAMEBLOCK)
|
||||
&& (mboot.parts[part].dp_start
|
||||
+ mboot.parts[part].dp_size > NAMEBLOCK)) {
|
||||
printf(" Name sector lies within a Bios partition.\n");
|
||||
printf(" Aborting write.\n");
|
||||
exit(1);
|
||||
}
|
||||
+ mboot.parts[part].dp_size > NAMEBLOCK))
|
||||
errx(1,
|
||||
"name sector lies within a Bios partition: aborting write");
|
||||
}
|
||||
|
||||
|
||||
/*******************************************
|
||||
* Now check the name sector itself to see if it's been initialised.
|
||||
* Now check the name sector itself to see if it's been initialized.
|
||||
*/
|
||||
if (lseek(fd,NAMEBLOCK * BLOCKSIZE,0) == -1) {
|
||||
perror("lseek");
|
||||
exit(1);
|
||||
}
|
||||
if ( read (fd,namebuf,BLOCKSIZE ) != BLOCKSIZE) {
|
||||
perror("read1");
|
||||
exit(1);
|
||||
}
|
||||
if (lseek(fd,NAMEBLOCK * BLOCKSIZE,0) == -1)
|
||||
err(1, "lseek");
|
||||
if (read(fd,namebuf,BLOCKSIZE) != BLOCKSIZE)
|
||||
err(1, "read1");
|
||||
/*******************************************
|
||||
* check if we are just enabling or disabling
|
||||
* Remember the flags are exlusive..
|
||||
* Remember the flags are exclusive..
|
||||
*/
|
||||
if(!bflag) { /* don't care what's there if bflag is set */
|
||||
switch(*(unsigned long *)cp)
|
||||
@ -159,10 +141,7 @@ main (int argc, char** argv)
|
||||
case ENABLE_MAGIC:
|
||||
break;
|
||||
default:
|
||||
fprintf(stderr,
|
||||
"namesector not initialised.."
|
||||
"use the -b flag..\n");
|
||||
exit(1);
|
||||
errx(1, "namesector not initialized, use the -b flag");
|
||||
}
|
||||
}
|
||||
|
||||
@ -199,24 +178,18 @@ main (int argc, char** argv)
|
||||
/*******************************************
|
||||
* write it to disk.
|
||||
*/
|
||||
if (lseek(fd,NAMEBLOCK * BLOCKSIZE,0) == -1) {
|
||||
perror("lseek");
|
||||
exit(1);
|
||||
}
|
||||
if(write (fd,namebuf,BLOCKSIZE ) != BLOCKSIZE) {
|
||||
perror("write");
|
||||
exit(1);
|
||||
}
|
||||
if (lseek(fd,NAMEBLOCK * BLOCKSIZE,0) == -1)
|
||||
err(1, "lseek");
|
||||
if(write (fd,namebuf,BLOCKSIZE ) != BLOCKSIZE)
|
||||
err(1, "write");
|
||||
|
||||
#if 0
|
||||
/*******************************************
|
||||
* just to be safe/paranoid.. read it back..
|
||||
* and print it..
|
||||
*/
|
||||
if (lseek(fd,NAMEBLOCK * BLOCKSIZE,0) == -1) {
|
||||
perror("lseek (second) ");
|
||||
exit(1);
|
||||
}
|
||||
if (lseek(fd,NAMEBLOCK * BLOCKSIZE,0) == -1)
|
||||
err(1, "lseek (second)");
|
||||
read (fd,namebuf,512);
|
||||
for (i = 0;i< 16;i++) {
|
||||
for ( j = 0; j < 16; j++) {
|
||||
@ -227,5 +200,3 @@ main (int argc, char** argv)
|
||||
#endif
|
||||
exit(0);
|
||||
}
|
||||
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user