NAME

KASSERT — kernel expression verification macro

SYNOPSIS

options INVARIANTS

#include < sys/param.h>
#include < sys/systm.h>

KASSERT( expression, msg);

DESCRIPTION

In a kernel compiled with options INVARIANTS, the KASSERT() macro tests the given expression and if it is false, calls the panic(9) function, terminating the running system.

In a kernel that does not have options INVARIANTS, the KASSERT() macro is defined to be a no-op. The second argument is a printf(9) format string and its arguments, enclosed in parentheses.

EXAMPLES

The kernel function vput() must not be called with a NULL pointer.

void 
vput(vp) 
        struct vnode *vp; 
{ 
 struct proc *p = curproc; 
 KASSERT(vp != NULL, ("vput: null vp")); 
 ... 
}

SEE ALSO

config(8), panic(9)

AUTHORS

This manual page was written by Jonathan M. Bresler <jmb@FreeBSD.org>.