Rename the WATCHDOG option to SW_WATCHDOG and make it use the
generic watchdoc(9) interface. Make watchdogd(8) perform as watchdog(8) as well, and make it possible to specify a check command to run, timeout and sleep periods. Update watchdog(4) to talk about the generic interface and add new watchdog(8) page.
This commit is contained in:
Poul-Henning Kamp
parent
2676fbe88c
commit
4103b7652d
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=126383
@ -1,4 +1,4 @@
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.\" Copyright (c) 2004 Poul-Henning Kamp <phk@FreeBSD.org>
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.\" Copyright (c) 2003 Sean M. Kelly <smkelly@FreeBSD.org>
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.\" All rights reserved.
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.\"
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@ -26,42 +26,49 @@
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.\" $FreeBSD$
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.\"
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.Dd June 25, 2003
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.Dt WATCHDOG 4
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.Dt watchdog 4
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.Os
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.Sh NAME
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.Nm watchdog
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.Nd Software watchdog
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.Nd Hardware and Software watchdog
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.Sh SYNOPSIS
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.Cd options WATCHDOG
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.Cd options CPU_ELAN
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.Cd options CPU_GEODE
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.Cd options SW_WATCHDOG
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.Pp
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.In sys/watchdog.h
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.Bd -literal
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u_int u = WD_ACTIVE | WD_8SEC;
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int fd = open("/dev/" _PATH_WATCHDOG, O_RDWR);
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ioctl(fd, WDIOCPATPAT, &u);
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.Ed
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.Sh DESCRIPTION
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.Nm
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is a set of checks and routines which allow the implementation of a software
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watchdog solution.
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is a facility for controlling hardware and software watchdog facilities.
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.Pp
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The user interface for
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.Nm
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is implemented via a trio of sysctl OIDs.
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When
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.Li debug.watchdog.enabled
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is set to a positive value,
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.Nm
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timeout checks are performed.
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In order to keep the watchdog from triggering,
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.Li debug.watchdog.reset
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must be accessed,
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by reading or writing,
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within every
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.Li debug.watchdog.timeout
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seconds.
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Failure to keep the
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.Nm
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updated will result in the kernel outputting interrupt counts,
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backtraces,
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and then attempting to enter
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.Xr ddb 9 .
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The interface is through a device named "/dev/" _PATH_WATCHDOG which
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responds to a single ioctl call, WDIOCPATPAT.
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.Pp
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The ioctl call takes an argument which consists of a timeout value
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specified an integer power of two nanoseconds.
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.Pp
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In the flag WD_ACTIVE signals that the watchdog will be kept from
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timing out from userland, for instance by the
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.Xr watchdogd 8
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daemon.
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.Pp
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To disable the watchdogs, use an argument of zero.
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.Pp
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The ioctl call will return success if just one of the available
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watchdog implementations support the request.
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If the ioctl fails, for instance if no watchdog supports the timeout
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length, all watchdogs are disabled and must be explicitly reenabled.
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.Sh SEE ALSO
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.Xr sysctl 8 ,
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.Xr watchdogd 8
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.Xr watchdogd 9
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.Sh HISTORY
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The
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.Nm
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@ -70,7 +77,12 @@ code first appeared in
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.Sh AUTHORS
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.An -nosplit
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The
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.Nm
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.Nm watchdog
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facility were written by
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.An Poul-Henning Kamp Aq phk@FreeBSD.org .
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.Pp
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The
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.Nm SW_WATCHDOG
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code and manual page were written by
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.An Sean Kelly Aq smkelly@FreeBSD.org .
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Some contributions were made by
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@ -2089,11 +2089,9 @@ options BOOTP_WIRED_TO=fxp0 # Use interface fxp0 for BOOTP
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options HW_WDOG
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#
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# Add software watchdog routines. This will add some sysctl OIDs that
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# can be used in combination with an external daemon to create a
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# software-based watchdog solution.
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# Add software watchdog routines.
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#
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options WATCHDOG
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options SW_WATCHDOG
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#
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# Disable swapping of upages and stack pages. This option removes all
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@ -153,9 +153,9 @@ SHMSEG opt_sysvipc.h
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SYSVMSG opt_sysvipc.h
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SYSVSEM opt_sysvipc.h
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SYSVSHM opt_sysvipc.h
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SW_WATCHDOG opt_watchdog.h
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TTYHOG opt_tty.h
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VFS_AIO
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WATCHDOG opt_watchdog.h
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WLCACHE opt_wavelan.h
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WLDEBUG opt_wavelan.h
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@ -90,21 +90,14 @@ long cp_time[CPUSTATES];
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SYSCTL_OPAQUE(_kern, OID_AUTO, cp_time, CTLFLAG_RD, &cp_time, sizeof(cp_time),
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"LU", "CPU time statistics");
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#ifdef WATCHDOG
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static int sysctl_watchdog_reset(SYSCTL_HANDLER_ARGS);
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static void watchdog_fire(void);
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#ifdef SW_WATCHDOG
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#include <sys/watchdog.h>
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static int watchdog_ticks;
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static int watchdog_enabled;
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static unsigned int watchdog_ticks;
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static int watchdog_timeout = 20;
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SYSCTL_NODE(_debug, OID_AUTO, watchdog, CTLFLAG_RW, 0, "System watchdog");
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SYSCTL_INT(_debug_watchdog, OID_AUTO, enabled, CTLFLAG_RW, &watchdog_enabled,
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0, "Enable the watchdog");
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SYSCTL_INT(_debug_watchdog, OID_AUTO, timeout, CTLFLAG_RW, &watchdog_timeout,
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0, "Timeout for watchdog checkins");
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#endif /* WATCHDOG */
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static void watchdog_fire(void);
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static void watchdog_config(void *, u_int, int *);
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#endif /* SW_WATCHDOG */
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/*
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* Clock handling routines.
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@ -167,6 +160,9 @@ initclocks(dummy)
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if (profhz == 0)
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profhz = i;
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psratio = profhz / i;
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#ifdef SW_WATCHDOG
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EVENTHANDLER_REGISTER(watchdog_list, watchdog_config, NULL, 0);
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#endif
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}
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/*
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@ -251,11 +247,10 @@ hardclock(frame)
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if (need_softclock)
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swi_sched(softclock_ih, 0);
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#ifdef WATCHDOG
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if (watchdog_enabled > 0 &&
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(int)(ticks - watchdog_ticks) >= (hz * watchdog_timeout))
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#ifdef SW_WATCHDOG
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if (watchdog_enabled > 0 && --watchdog_ticks <= 0)
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watchdog_fire();
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#endif /* WATCHDOG */
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#endif /* SW_WATCHDOG */
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}
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/*
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@ -508,24 +503,25 @@ SYSCTL_PROC(_kern, KERN_CLOCKRATE, clockrate, CTLTYPE_STRUCT|CTLFLAG_RD,
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0, 0, sysctl_kern_clockrate, "S,clockinfo",
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"Rate and period of various kernel clocks");
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#ifdef WATCHDOG
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/*
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* Reset the watchdog timer to ticks, thus preventing the watchdog
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* from firing for another watchdog timeout period.
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*/
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static int
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sysctl_watchdog_reset(SYSCTL_HANDLER_ARGS)
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#ifdef SW_WATCHDOG
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static void
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watchdog_config(void *unused __unused, u_int cmd, int *err)
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{
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int ret;
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u_int u;
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ret = 0;
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watchdog_ticks = ticks;
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return sysctl_handle_int(oidp, &ret, 0, req);
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if (cmd) {
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u = cmd & WD_INTERVAL;
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if (u < WD_TO_1SEC)
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return;
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watchdog_ticks = (1 << (u - WD_TO_1SEC)) * hz;
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watchdog_enabled = 1;
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*err = 0;
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} else {
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watchdog_enabled = 0;
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}
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}
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SYSCTL_PROC(_debug_watchdog, OID_AUTO, reset, CTLFLAG_RW, 0, 0,
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sysctl_watchdog_reset, "I", "Reset the watchdog");
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/*
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* Handle a watchdog timeout by dumping interrupt information and
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* then either dropping to DDB or panicing.
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@ -560,4 +556,4 @@ watchdog_fire(void)
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#endif /* DDB */
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}
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#endif /* WATCHDOG */
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#endif /* SW_WATCHDOG */
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@ -1,7 +1,14 @@
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# $FreeBSD$
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PROG= watchdogd
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MAN= watchdogd.8
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LINKS= ${BINDIR}/watchdogd ${BINDIR}/watchdog
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MAN= watchdogd.8 watchdog.8
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WARNS?= 6
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LDADD= -lm
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DPADD= ${LIBM}
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.include <bsd.prog.mk>
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test: ${PROG}
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./${PROG} -t 1.0
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66
usr.sbin/watchdogd/watchdog.8
Normal file
66
usr.sbin/watchdogd/watchdog.8
Normal file
@ -0,0 +1,66 @@
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.\" Copyright (c) 2004 Poul-Henning Kamp <phk@FreeBSD.org>
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.\" Copyright (c) 2003 Sean M. Kelly <smkelly@FreeBSD.org>
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
|
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.\" 2. Redistributions in binary form must reproduce the above copyright
|
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.\" notice, this list of conditions and the following disclaimer in the
|
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
||||
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd February 28, 2004
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.Dt WATCHDOG 8
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.Os
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.Sh NAME
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.Nm watchdog
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.Nd watchdog control program
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.Sh SYNOPSIS
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.Nm
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.Op Fl d
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.Op Fl t Ar timeout
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.Sh DESCRIPTION
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The
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.Nm
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utility can be used to control the kernels watchdog facility.
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.Pp
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The
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.Fl t Ar timeout
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specifies the desired timeout period in seconds, a value of
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zero will disable the watchdog.
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.Sh SEE ALSO
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.Xr watchdogd 8 ,
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.Xr watchdog 4 ,
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.Xr watchdog 9 ,
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.Sh AUTHORS
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.An -nosplit
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The
|
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.Nm
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utility and manual page were written by
|
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.An Sean Kelly Aq smkelly@FreeBSD.org
|
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and
|
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.An Poul-Henning Kamp Aq phk@FreeBSD.org
|
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.Pp
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Some contributions made by
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.An Jeff Roberson Aq jeff@FreeBSD.org .
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.Sh HISTORY
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The
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.Nm
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utility appeared in
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.Fx 5.1 .
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@ -1,3 +1,4 @@
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.\" Copyright (c) 2004 Poul-Henning Kamp <phk@FreeBSD.org>
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.\" Copyright (c) 2003 Sean M. Kelly <smkelly@FreeBSD.org>
|
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.\" All rights reserved.
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.\"
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@ -29,21 +30,46 @@
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.Os
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.Sh NAME
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.Nm watchdogd
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.Nd Software watchdog daemon
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.Nd Watchdog daemon
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.Sh SYNOPSIS
|
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.Nm
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.Op Fl d
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.Op Fl e Ar cmd
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.Op Fl I Ar file
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.Op Fl s Ar sleep
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.Op Fl t Ar timeout
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.Sh DESCRIPTION
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The
|
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.Nm
|
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utility interfaces with the kernel's software watchdog facility to ensure
|
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utility interfaces with the kernel's watchdog facility to ensure
|
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that the system is in a working state.
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If
|
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.Nm
|
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is unable to interface with the kernel over a specific timeout,
|
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the kernel will take actions to assist in debugging or restarting the computer.
|
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.Pp
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If
|
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.Fl e Ar cmd
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is specified,
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.Nm
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will attempt to execute this command with
|
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.Xr system 3
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and only if the command returns with a zero exit code will the
|
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watchdog be reset.
|
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If
|
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.Fl e Ar cmd
|
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is not specified the daemon will perform a trivial filesystem
|
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check instead.
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.Pp
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The
|
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.Fl -s Ar sleep
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argument can be used to control the sleep period between each execution
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of the check and defaults to one second.
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.Pp
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The
|
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.Fl -t Ar timeout
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specifies the desired timeout period in seconds.
|
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.Pp
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One possible circumstance which will cause a watchdog timeout is an interrupt
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storm.
|
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If this occurs,
|
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@ -80,13 +106,16 @@ will not fork into the background at startup.
|
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.El
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.Sh SEE ALSO
|
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.Xr watchdog 4 ,
|
||||
.Xr sysctl 8
|
||||
.Xr watchdog 8 ,
|
||||
.Xr watchdog 9 ,
|
||||
.Sh AUTHORS
|
||||
.An -nosplit
|
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The
|
||||
.Nm
|
||||
utility and manual page were written by
|
||||
.An Sean Kelly Aq smkelly@FreeBSD.org .
|
||||
.An Sean Kelly Aq smkelly@FreeBSD.org
|
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and
|
||||
.An Poul-Henning Kamp Aq phk@FreeBSD.org .
|
||||
.Pp
|
||||
Some contributions made by
|
||||
.An Jeff Roberson Aq jeff@FreeBSD.org .
|
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|
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@ -35,12 +35,17 @@ __FBSDID("$FreeBSD$");
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#include <sys/stat.h>
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#include <sys/sysctl.h>
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#include <sys/time.h>
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#include <sys/watchdog.h>
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|
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#include <err.h>
|
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#include <errno.h>
|
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#include <fcntl.h>
|
||||
#include <math.h>
|
||||
#include <paths.h>
|
||||
#include <signal.h>
|
||||
#include <stdio.h>
|
||||
#include <stdlib.h>
|
||||
#include <string.h>
|
||||
#include <sysexits.h>
|
||||
#include <unistd.h>
|
||||
|
||||
@ -49,7 +54,7 @@ static void sighandler(int);
|
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static void watchdog_loop(void);
|
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static int watchdog_init(void);
|
||||
static int watchdog_onoff(int onoff);
|
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static int watchdog_tickle(void);
|
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static int watchdog_patpat(void);
|
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static void usage(void);
|
||||
|
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int debugging = 0;
|
||||
@ -57,6 +62,12 @@ int end_program = 0;
|
||||
const char *pidfile = _PATH_VARRUN "watchdogd.pid";
|
||||
int reset_mib[3];
|
||||
size_t reset_miblen = 3;
|
||||
u_int timeout = WD_TO_16SEC;
|
||||
u_int passive = 0;
|
||||
int is_daemon = 0;
|
||||
int fd = -1;
|
||||
int nap = 1;
|
||||
char *test_cmd = NULL;
|
||||
|
||||
/*
|
||||
* Periodically write to the debug.watchdog.reset sysctl OID
|
||||
@ -81,30 +92,40 @@ main(int argc, char *argv[])
|
||||
if (watchdog_init() == -1)
|
||||
errx(EX_SOFTWARE, "unable to initialize watchdog");
|
||||
|
||||
if (watchdog_onoff(1) == -1)
|
||||
exit(EX_SOFTWARE);
|
||||
if (is_daemon) {
|
||||
if (watchdog_onoff(1) == -1)
|
||||
exit(EX_SOFTWARE);
|
||||
|
||||
if (debugging == 0 && daemon(0, 0) == -1) {
|
||||
if (debugging == 0 && daemon(0, 0) == -1) {
|
||||
watchdog_onoff(0);
|
||||
err(EX_OSERR, "daemon");
|
||||
}
|
||||
|
||||
signal(SIGHUP, SIG_IGN);
|
||||
signal(SIGINT, sighandler);
|
||||
signal(SIGTERM, sighandler);
|
||||
|
||||
fp = fopen(pidfile, "w");
|
||||
if (fp != NULL) {
|
||||
fprintf(fp, "%d\n", getpid());
|
||||
fclose(fp);
|
||||
}
|
||||
|
||||
watchdog_loop();
|
||||
|
||||
/* exiting */
|
||||
watchdog_onoff(0);
|
||||
err(EX_OSERR, "daemon");
|
||||
unlink(pidfile);
|
||||
return (EX_OK);
|
||||
} else {
|
||||
if (passive)
|
||||
timeout |= WD_PASSIVE;
|
||||
else
|
||||
timeout |= WD_ACTIVE;
|
||||
if (watchdog_patpat() < 0)
|
||||
err(EX_OSERR, "patting the dog");
|
||||
return (EX_OK);
|
||||
}
|
||||
|
||||
signal(SIGHUP, SIG_IGN);
|
||||
signal(SIGINT, sighandler);
|
||||
signal(SIGTERM, sighandler);
|
||||
|
||||
fp = fopen(pidfile, "w");
|
||||
if (fp != NULL) {
|
||||
fprintf(fp, "%d\n", getpid());
|
||||
fclose(fp);
|
||||
}
|
||||
|
||||
watchdog_loop();
|
||||
|
||||
/* exiting */
|
||||
watchdog_onoff(0);
|
||||
unlink(pidfile);
|
||||
return (EX_OK);
|
||||
}
|
||||
|
||||
/*
|
||||
@ -125,15 +146,12 @@ sighandler(int signum)
|
||||
static int
|
||||
watchdog_init()
|
||||
{
|
||||
int error;
|
||||
|
||||
error = sysctlnametomib("debug.watchdog.reset", reset_mib,
|
||||
&reset_miblen);
|
||||
if (error == -1) {
|
||||
warn("could not find reset OID");
|
||||
return (error);
|
||||
}
|
||||
return watchdog_tickle();
|
||||
fd = open("/dev/" _PATH_WATCHDOG, O_RDWR);
|
||||
if (fd >= 0)
|
||||
return (0);
|
||||
warn("Could not open watchdog device");
|
||||
return (-1);
|
||||
}
|
||||
|
||||
/*
|
||||
@ -148,11 +166,14 @@ watchdog_loop(void)
|
||||
while (end_program == 0) {
|
||||
failed = 0;
|
||||
|
||||
failed = stat("/etc", &sb);
|
||||
if (test_cmd != NULL)
|
||||
failed = system(test_cmd);
|
||||
else
|
||||
failed = stat("/etc", &sb);
|
||||
|
||||
if (failed == 0)
|
||||
watchdog_tickle();
|
||||
sleep(1);
|
||||
watchdog_patpat();
|
||||
sleep(nap);
|
||||
}
|
||||
}
|
||||
|
||||
@ -161,10 +182,10 @@ watchdog_loop(void)
|
||||
* to keep the watchdog from firing.
|
||||
*/
|
||||
int
|
||||
watchdog_tickle(void)
|
||||
watchdog_patpat(void)
|
||||
{
|
||||
|
||||
return sysctl(reset_mib, reset_miblen, NULL, NULL, NULL, 0);
|
||||
return ioctl(fd, WDIOCPATPAT, &timeout);
|
||||
}
|
||||
|
||||
/*
|
||||
@ -174,22 +195,12 @@ watchdog_tickle(void)
|
||||
static int
|
||||
watchdog_onoff(int onoff)
|
||||
{
|
||||
int mib[3];
|
||||
int error;
|
||||
size_t len;
|
||||
|
||||
len = 3;
|
||||
|
||||
error = sysctlnametomib("debug.watchdog.enabled", mib, &len);
|
||||
if (error == 0)
|
||||
error = sysctl(mib, len, NULL, NULL, &onoff, sizeof(onoff));
|
||||
|
||||
if (error == -1) {
|
||||
warn("could not %s watchdog",
|
||||
(onoff > 0) ? "enable" : "disable");
|
||||
return (error);
|
||||
}
|
||||
return (0);
|
||||
if (onoff)
|
||||
timeout |= WD_ACTIVE;
|
||||
else
|
||||
timeout &= ~WD_ACTIVE;
|
||||
return watchdog_patpat();
|
||||
}
|
||||
|
||||
/*
|
||||
@ -198,7 +209,10 @@ watchdog_onoff(int onoff)
|
||||
static void
|
||||
usage()
|
||||
{
|
||||
fprintf(stderr, "usage: watchdogd [-d] [-I file]\n");
|
||||
if (is_daemon)
|
||||
fprintf(stderr, "usage: watchdogd [-d] [-e cmd] [-I file]\n");
|
||||
else
|
||||
fprintf(stderr, "usage: watchdog [-d] [-t]\n");
|
||||
exit(EX_USAGE);
|
||||
}
|
||||
|
||||
@ -209,8 +223,14 @@ static void
|
||||
parseargs(int argc, char *argv[])
|
||||
{
|
||||
int c;
|
||||
char *p;
|
||||
double a;
|
||||
|
||||
while ((c = getopt(argc, argv, "I:d?")) != -1) {
|
||||
c = strlen(argv[0]);
|
||||
if (argv[0][c - 1] == 'd')
|
||||
is_daemon = 1;
|
||||
while ((c = getopt(argc, argv,
|
||||
is_daemon ? "I:de:s:t:?" : "dt:?")) != -1) {
|
||||
switch (c) {
|
||||
case 'I':
|
||||
pidfile = optarg;
|
||||
@ -218,10 +238,43 @@ parseargs(int argc, char *argv[])
|
||||
case 'd':
|
||||
debugging = 1;
|
||||
break;
|
||||
case 'e':
|
||||
test_cmd = strdup(optarg);
|
||||
break;
|
||||
#ifdef notyet
|
||||
case 'p':
|
||||
passive = 1;
|
||||
break;
|
||||
#endif
|
||||
case 's':
|
||||
p = NULL;
|
||||
errno = 0;
|
||||
nap = strtol(optarg, &p, 0);
|
||||
if ((p != NULL && *p != '\0') || errno != 0)
|
||||
errx(EX_USAGE, "-s argument is not a number");
|
||||
break;
|
||||
case 't':
|
||||
p = NULL;
|
||||
errno = 0;
|
||||
a = strtod(optarg, &p);
|
||||
if ((p != NULL && *p != '\0') || errno != 0)
|
||||
errx(EX_USAGE, "-t argument is not a number");
|
||||
if (a < 0)
|
||||
errx(EX_USAGE, "-t argument must be positive");
|
||||
if (a == 0)
|
||||
timeout = WD_TO_NEVER;
|
||||
else
|
||||
timeout = 1.0 + log(a * 1e9) / log(2.0);
|
||||
if (debugging)
|
||||
printf("Timeout is 2^%d nanoseconds\n",
|
||||
timeout);
|
||||
break;
|
||||
case '?':
|
||||
default:
|
||||
usage();
|
||||
/* NOTREACHED */
|
||||
}
|
||||
}
|
||||
if (is_daemon && timeout < WD_TO_1SEC)
|
||||
errx(EX_USAGE, "-t argument is less than one second.");
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user