freebsd-dev/share/man/man9/KASSERT.9
Bruce Evans 1c171d7474 Abuse .Fn for macros better (don't hand-format the parameter string by
quoting it all and adding commas).

Don't say that the expression in KASSERT() is an int.  It is a collection
of tokens forming a C expression that can be compared with 0.
2000-05-11 16:54:52 +00:00

76 lines
2.2 KiB
Groff

.\" -*- nroff -*-
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.\" Copyright (c) 2000 Jonathan M. Bresler
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.Dd January 14, 2000
.Os
.Dt KASSERT 9
.Sh NAME
.Nm KASSERT
.Nd kernel expression verification macro
.Sh SYNOPSIS
.Cd options INVARIANTS
.Fn KASSERT expression "const char *msg"
.Sh DESCRIPTION
In a kernel compiled with "options INVARIANTS",
the
.Fn KASSERT
macro tests the given
.Ar expression
and if it is false,
calls the
.Fn panic
syscall, terminating the running system.
.Pp
In a kernel that does not have "options INVARIANTS",
the
.Fn KASSERT
macro is defined to be a no-op.
.Sh EXAMPLES
The kernel function
.Fn vput
must not be called with a NULL pointer.
.Bd -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 .