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avg e96b4170d0 add ability to set watchdog timeout for a shutdown 
This change allows to specify a watchdog(9) timeout for a system
shutdown.  The timeout is activated when the watchdogd daemon is
stopped.  The idea is to a prevent any indefinite hang during late
stages of the shutdown.  The feature is implemented in rc.d/watchdogd,
it builds upon watchdogd -x option.

Note that the shutdown timeout is not actiavted when the watchdogd
service is individually stopped by an operator.  It is also not
activated for the 'shutdown' to the single-user mode.  In those cases it
is assumed that the operator knows what they are doing and they have
means to recover the system should it hang.

Significant subchanges and implementation details:
- the argument to rc.shutdown, completely unused before, is assigned to
  rc_shutdown variable that can be inspected by rc scripts
- init(8) passes "single" or "reboot" as the argument, this is not
  changed
- the argument is not mandatory and if it is not set then rc_shutdown is
  set to "unspecified"
- however, the default jail management scripts and jail configuration
  examples have been updated to pass "jail" to rc.shutdown, just in case
- the new timeout can be set via watchdogd_shutdown_timeout rc option
- for consistency, the regular timeout can now be set via
  watchdogd_timeout rc option
- watchdogd_shutdown_timeout and watchdogd_timeout override timeout
  specifications in watchdogd_flags
- existing configurations, where the new rc options are not set, should
  keep working as before

I am not particularly wed to any of the implementation specifics.
I am open to changing or removing any of them as long as the provided
functionality is the same (or very close) to the proposed one.
For example, I think it can be implemented without using watchdogd -x,
by means of watchdog(1) alone.  In that case there would be a small
window between stopping watchdogd and running watchdog, but I think that
that is acceptable.

Reviewed by:	bcr (man page changes)
MFC after:	5 weeks
Relnotes:	yes
Differential Revision: https://reviews.freebsd.org/D21221
2019-10-03 11:23:10 +00:00
..
adjkerntz various: general adoption of SPDX licensing ID tags. 2017-11-27 15:37:16 +00:00
bectl bectl(8): Add a "check" command 2019-09-11 13:27:10 +00:00
bsdlabel Remove deprecated GEOM classes 2019-08-13 20:06:55 +00:00
camcontrol Remove Tagged Command Queuing feature reporting. 2019-09-12 17:42:37 +00:00
ccdconfig ccdconfig: Move VCS tags to be more consistent with our style. 2017-12-30 00:26:42 +00:00
clri In preparation for adding inode check-hashes, clean up and 2018-11-13 21:40:56 +00:00
comcontrol various: general adoption of SPDX licensing ID tags. 2017-11-27 15:37:16 +00:00
conscontrol various: general adoption of SPDX licensing ID tags. 2017-11-27 15:37:16 +00:00
ddb Move ddb.conf to sbin/ddb/ and switch to CONFS. 2018-08-11 13:25:39 +00:00
decryptcore EKCD: Add Chacha20 encryption mode 2019-05-23 20:12:24 +00:00
devd Stop linking to libl by specifying we do not need yywrap 2019-09-10 08:19:46 +00:00
devfs Move all devfs related files to sbin/devfs/ 2018-08-22 15:55:23 +00:00
devmatch Regularize the Netflix copyright 2019-02-04 21:28:25 +00:00
dhclient Free DHCP options with length zero. 2019-06-26 20:19:48 +00:00
dmesg General further adoption of SPDX licensing ID tags. 2017-11-20 19:49:47 +00:00
dump Clarify that the -r and -R options can be used only to create level 0 dumps. 2019-06-14 06:10:15 +00:00
dumpfs The goal of this change is to prevent accidental foot shooting by 2018-02-08 23:06:58 +00:00
dumpon EKCD: Add Chacha20 encryption mode 2019-05-23 20:12:24 +00:00
etherswitchcfg Add the 'drop tagged' flag support for ethernet switch ports. 2019-06-28 22:12:43 +00:00
fdisk Remove deprecated GEOM classes 2019-08-13 20:06:55 +00:00
ffsinfo In preparation for adding inode check-hashes, clean up and 2018-11-13 21:40:56 +00:00
fsck explain ``fsck -f'' more in detail 2019-03-08 10:03:16 +00:00
fsck_ffs Correct the location of the first backup superblock in fsck_ffs.8. 2019-08-07 16:56:00 +00:00
fsck_msdosfs Avoid mixing cluster numbers and sector numbers. Makes code more readable. 2019-09-15 19:41:54 +00:00
fsdb After a crash, a file that extends into indirect blocks may end up 2019-02-25 21:58:19 +00:00
fsirand Continuing efforts to provide hardening of FFS. This change adds a 2018-12-11 22:14:37 +00:00
gbde gbde(8) - simplify randomisation with arc4random_buf 2019-02-11 00:11:02 +00:00
geom Add the "-t" option to geom(8) utility, to display geoms hierarchy. 2018-09-14 15:29:45 +00:00
ggate Fix typo not -> nor and add 'the' because we are talking about specific flags 2019-09-06 15:01:47 +00:00
growfs Normally when an attempt is made to mount a UFS/FFS filesystem whose 2018-12-06 00:09:39 +00:00
gvinum gvinum: revert WARNS change in Makefile 2018-06-17 01:39:22 +00:00
hastctl various: general adoption of SPDX licensing ID tags. 2017-11-27 15:37:16 +00:00
hastd Drop "All rights reserved" from my copyright statements. 2019-03-06 22:11:45 +00:00
ifconfig ifconfig: add report of the string from SIOCGIFDOWNREASON. 2019-09-17 18:51:10 +00:00
init add ability to set watchdog timeout for a shutdown 2019-10-03 11:23:10 +00:00
ipf Create a link to the ipmon.conf.5 man page as documented in ipmon.5. 2019-06-27 12:37:44 +00:00
ipfw ipfw: fix jail option after r348215 2019-08-05 00:08:25 +00:00
iscontrol Fix formatting. 2019-08-08 20:56:52 +00:00
kldconfig various: general adoption of SPDX licensing ID tags. 2017-11-27 15:37:16 +00:00
kldload various: general adoption of SPDX licensing ID tags. 2017-11-27 15:37:16 +00:00
kldstat Allow three digits of module id without breaking table alignment. 2018-07-02 09:14:00 +00:00
kldunload various: general adoption of SPDX licensing ID tags. 2017-11-27 15:37:16 +00:00
ldconfig Make ldconfig(8) atomic, by removing an unneccessary call to unlink(2) 2018-08-09 11:46:12 +00:00
md5 Close filedescriptors when done with them. 2019-04-19 06:49:46 +00:00
mdconfig Use VOP_ADVISE() with POSIX_FADV_DONTNEED instead of IO_DIRECT to 2018-12-21 08:15:31 +00:00
mdmfs mdmfs(8): use -o reserve with malloc-backed md(4) 2019-02-16 23:57:38 +00:00
mknod General further adoption of SPDX licensing ID tags. 2017-11-20 19:49:47 +00:00
mksnap_ffs various: general adoption of SPDX licensing ID tags. 2017-11-27 15:37:16 +00:00
mount Add two options to allow mount to avoid covering up existing mount points. 2019-09-23 04:28:07 +00:00
mount_cd9660 Advise reader to also see mdconfig(8) in mount_cd9660(8). 2018-08-11 08:34:24 +00:00
mount_fusefs mount_fusefs: fix a segfault on memory allocation failure 2019-09-07 21:49:01 +00:00
mount_msdosfs mount_msdosfs: do not fail mounts requiring locale name conversion table 2018-10-27 16:41:34 +00:00
mount_nfs General further adoption of SPDX licensing ID tags. 2017-11-20 19:49:47 +00:00
mount_nullfs General further adoption of SPDX licensing ID tags. 2017-11-20 19:49:47 +00:00
mount_udf General further adoption of SPDX licensing ID tags. 2017-11-20 19:49:47 +00:00
mount_unionfs General further adoption of SPDX licensing ID tags. 2017-11-20 19:49:47 +00:00
natd DIRDEPS_BUILD: Update dependencies. 2017-10-31 00:07:04 +00:00
newfs Correct the location of the first backup superblock in fsck_ffs.8. 2019-08-07 16:56:00 +00:00
newfs_msdos When creating a new FAT32 filesystem, use "unknown" (0xFFFFFFFF) for 2019-08-22 06:14:06 +00:00
nfsiod pkgbase: Create a FreeBSD-utilities package and make it the default one 2019-09-05 14:15:47 +00:00
nos-tun pkgbase: Create a FreeBSD-utilities package and make it the default one 2019-09-05 14:15:47 +00:00
nvmecontrol Size is unsigned, so remove the test entirely. 2019-09-25 07:51:30 +00:00
pfctl pkgbase: pfctl: tests: Put tests files in the FreeBSD-tests package 2019-09-05 14:19:06 +00:00
pfilctl Hopefully fix compilation by other compilers. 2019-02-01 00:34:18 +00:00
pflogd DIRDEPS_BUILD: Update dependencies. 2017-10-31 00:07:04 +00:00
ping ping: Verify whether a datagram timestamp was actually received. 2019-09-11 18:54:45 +00:00
ping6 ping6: Use caph_rights_limit(3) for STDIN_FILENO 2019-09-23 22:20:11 +00:00
quotacheck Normally when an attempt is made to mount a UFS/FFS filesystem whose 2018-12-06 00:09:39 +00:00
rcorder pkgbase: Move rc scripts and related files to their own packages 2019-09-05 14:08:45 +00:00
reboot Update the manpage text to show the output generated by the first-stage 2019-04-30 17:42:05 +00:00
recoverdisk recoverdisk(1): fclose() file supplied via '-r readlist' parameter when 2019-02-07 14:40:28 +00:00
resolvconf sbin: normalize paths using SRCTOP-relative paths or :H when possible 2017-03-04 11:33:01 +00:00
restore Re-enable reading byte swapped NFS_MAGIC dumps. 2018-08-11 16:12:23 +00:00
route route(8): clarify -prefixlen description 2019-01-10 00:10:12 +00:00
routed When bind fails, make sure we closed the socket we tried to bind the 2017-12-28 05:34:24 +00:00
rtsol Capsicumize rtsol(8) and rtsold(8). 2019-01-05 16:05:39 +00:00
savecore cap_fileargs: chase r346315, update fileargs_init in consumers 2019-04-17 16:18:14 +00:00
sconfig DIRDEPS_BUILD: Update dependencies. 2017-10-31 00:07:04 +00:00
setkey pkgbase: Create a FreeBSD-utilities package and make it the default one 2019-09-05 14:15:47 +00:00
shutdown shutdown: Fix r327476 by adding init 2018-01-02 09:02:42 +00:00
spppcontrol various: general adoption of SPDX licensing ID tags. 2017-11-27 15:37:16 +00:00
sunlabel Remove deprecated GEOM classes 2019-08-13 20:06:55 +00:00
swapon swap_pager.c reserves 2 blocks for a bsd label. Change that 2 to the 2019-08-15 02:30:44 +00:00
sysctl evdev: export event device properties through sysctl interface 2019-02-24 18:47:04 +00:00
tests
tunefs The size of the UFS soft-updates journal must be a multiple of the 2019-03-02 21:22:56 +00:00
umount umount: remove sync(2) call when used with -f 2018-09-13 13:57:42 +00:00
veriexec Add verifying manifest loader for mac_veriexec 2019-02-26 06:17:23 +00:00
zfsbootcfg DIRDEPS_BUILD: Update dependencies. 2017-10-31 00:07:04 +00:00
Makefile Remove NAND and NANDFS support 2019-06-25 04:50:09 +00:00
Makefile.amd64 NVME support is only for x86 and powerpc64. 2018-06-14 01:15:19 +00:00
Makefile.arm
Makefile.i386 NVME support is only for x86 and powerpc64. 2018-06-14 01:15:19 +00:00
Makefile.inc
Makefile.mips
Makefile.powerpc64 NVME support is only for x86 and powerpc64. 2018-06-14 01:15:19 +00:00
Makefile.sparc64