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⟩.

Debian                                          January 14, 2000                                      KASSERT(9)