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NetBSD 6.1.5 - man page for kdassertmsg (netbsd section 9)

KASSERT(9)			  BSD Kernel Developer's Manual 		       KASSERT(9)

NAME
     KASSERT, KASSERTMSG, KDASSERT, KDASSERTMSG -- kernel expression verification macros

SYNOPSIS
     void
     KASSERT(expression);

     void
     KASSERTMSG(expression, format, ...);

     void
     KDASSERT(expression);

     void
     KDASSERTMSG(expression, format, ...);

DESCRIPTION
     These machine independent assertion-checking macros cause a kernel panic(9) if the given
     expression evaluates to false.  Two compile-time options(4) define the behavior of the
     checks.

       1.   The KASSERT() and KASSERTMSG() tests are included only in kernels compiled with the
	    DIAGNOSTIC configuration option.  In a kernel that does not have this configuration
	    option, the macros are defined to be no-ops.

       2.   The KDASSERT() and KDASSERTMSG() tests are included only in kernels compiled with the
	    DEBUG configuration option.  The KDASSERT() and KASSERT() macros are identical except
	    for the controlling option (DEBUG vs DIAGNOSTIC).  Basically, KASSERT() should be
	    used for light-weight checks and KDASSERT() should be used for heavier ones.

     Callers should not rely on the side effects of expression because, depending on the kernel
     compile options mentioned above, expression might not be evaluated at all.

     The panic message will display the style of assertion (debugging vs. diagnostic), the
     expression that failed and the filename, and line number the failure happened on.	The
     KASSERTMSG() and KDASSERTMSG() macros append to the panic(9) format string the message spec-
     ified by format and its subsequent arguments, similar to printf(9) functions.

SEE ALSO
     config(1), options(4), CTASSERT(9), panic(9), printf(9)

AUTHORS
     These macros were written by Chris G. Demetriou <cgd@netbsd.org>.

BSD					September 27, 2011				      BSD


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