sunos man page for assert

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

NAME
       ASSERT, assert - expression verification

SYNOPSIS
       #include <sys/debug.h>

       void ASSERT(EX);

INTERFACE LEVEL
       Architecture independent level 1 (DDI/DKI).

PARAMETERS
       EX	boolean expression.

DESCRIPTION
       ASSERT()  is  a macro which checks to see if the expression EX is true. If it is not, then ASSERT() causes an error message to be logged to
       the console and the system to panic. ASSERT() works only if the preprocessor symbol DEBUG is defined.

CONTEXT
       ASSERT() can be used from user or interrupt context.

SEE ALSO
       Writing Device Drivers

SunOS 5.10							    11 Apr 1991 							ASSERT(9F)