DDI_IN_PANIC(9F) Kernel Functions for Drivers DDI_IN_PANIC(9F)

NAME

ddi_in_panic - determine if system is in panic state

SYNOPSIS

#include <sys/ddi.h>
#include <sys/sunddi.h>


int ddi_in_panic(void);

INTERFACE LEVEL

illumos DDI specific (illumos DDI).

DESCRIPTION

Drivers controlling devices on which the system may write a kernel
crash dump in the event of a panic can call ddi_in_panic() to
determine if the system is panicking.


When the system is panicking, the calls of functions scheduled by
timeout(9F) and ddi_trigger_softintr(9F) will never occur. Neither
can delay(9F) be relied upon, since it is implemented via
timeout(9F).


Drivers that need to enforce a time delay such as SCSI bus reset
delay time must busy-wait when the system is panicking.

RETURN VALUES

ddi_in_panic() returns 1 if the system is in panic, or 0
otherwise.

CONTEXT

ddi_in_panic() may be called from any context.

SEE ALSO

dump(9E), ddi_trigger_softintr(9F), delay(9F), timeout(9F)


Writing Device Drivers

June 23, 1997 DDI_IN_PANIC(9F)