Man page or keyword search:   man All Sections 1 - General Commands 2 - System Calls 3 - Subroutines, Functions 4 - Special Files 5 - File Formats 6 - Games and Screensavers 7 - Macros and Conventions 8 - Maintenence Commands 9 - Kernel Interface New Commands Server 4.4BSD AIX Alpinelinux Archlinux Aros BSDOS BSDi Bifrost CentOS Cygwin Darwin Debian DigitalUNIX DragonFly ElementaryOS Fedora FreeBSD Gentoo GhostBSD HP-UX Haiku Hurd IRIX Inferno JazzOS Kali Knoppix LinuxMint MacOSX Mageia Mandriva Manjaro Minix MirBSD NeXTSTEP NetBSD OPENSTEP OSF1 OpenBSD OpenDarwin OpenIndiana OpenMandriva OpenServer OpenSuSE OpenVMS Oracle PC-BSD Peanut Pidora Plan9 QNX Raspbian RedHat Scientific Slackware SmartOS Solaris SuSE SunOS Syllable Tru64 UNIXv7 Ubuntu Ultrix UnixWare Xenix YellowDog aLinux   9087 pages apropos Keyword Search (all sections) Output format html ascii pdf view pdf save postscript

SWWDOG(4)		 BSD Kernel Interfaces Manual		     SWWDOG(4)

NAME
     swwdog — software watchdog timer

SYNOPSIS
     pseudo-device swwdog

DESCRIPTION
     The swwdog driver provides a software watchdog timer that works with
     wdogctl(8).  If the timer expires, the system reboots if the boolean
     variable swwdog_reboot is true; otherwise, the system will panic.
     swwdog_reboot is accessible as a sysctl(8) variable, hw.swwdog.reboot and
     defaults to false.

     The default period of swwdog is 60 seconds.

     As with other watchdog timers, the swwdog driver prevents a system from
     suspending when the watchdog is armed.

SEE ALSO
     sysctl(8), wdogctl(8)

HISTORY
     The swwdog driver was written by Steven M. Bellovin.

BUGS
     Only one watchdog timer can be active at any given time.  (Arguably, this
     is a bug in the watchdog timer framework.)	 Therefore, only a single
     instance of the swwdog device can be created.

     Kernel tickle mode is useless with swwdog and arguably should be
     rejected, since both it and this driver rely on the same callout mecha‐
     nism; if one is blocked, almost certainly the other is as well.

     The alarm option to wdogctl(8) isn't implemented.

BSD				 June 8, 2011				   BSD

                             _         _         _ 
                            | |       | |       | |     
                            | |       | |       | |     
                         __ | | __ __ | | __ __ | | __  
                         \ \| |/ / \ \| |/ / \ \| |/ /  
                          \ \ / /   \ \ / /   \ \ / /   
                           \   /     \   /     \   /    
                            \_/       \_/       \_/ 

Vote for polarhome