Copyright (c) 2000 Jonathan M. Bresler
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$FreeBSD: releng/10.2/share/man/man9/KASSERT.9 206622 2010-04-14 19:08:06Z uqs $
.Dd January 14, 2000 .Dt KASSERT 9 .Os .Sh NAME .Nm KASSERT .Nd kernel expression verification macro .Sh SYNOPSIS .Cd "options INVARIANTS"
p n sys/param.h n sys/systm.h .Fn KASSERT expression msg .Sh DESCRIPTION In a kernel compiled with .Cd "options INVARIANTS" , the .Fn KASSERT macro tests the given .Fa expression and if it is false, calls the .Xr panic 9 function, terminating the running system.
p In a kernel that does not have .Cd "options INVARIANTS" , the .Fn KASSERT macro is defined to be a no-op. The second argument is a .Xr printf 9 format string and its arguments, enclosed in parentheses. .Sh EXAMPLES The kernel function .Fn vput must not be called with a .Dv NULL pointer. d -literal -offset indent void vput(vp) struct vnode *vp; { struct proc *p = curproc; KASSERT(vp != NULL, ("vput: null vp")); ... } .Ed .Sh SEE ALSO .Xr config 8 , .Xr panic 9 .Sh AUTHORS This manual page was written by .An Jonathan M. Bresler .Aq jmb@FreeBSD.org .