title: is `retry` a C keyword
body: <p>I'am not a kick-ass C developer and just was curious about FreeBSD kernel. When I was reading some files, found <a href="https://github.com/freebsd/freebsd/blob/master/sys/kern/kern_fork.c#L260" rel="nofollow noreferrer"><strong>This line</strong></a>. I googled for it and found nothing. Is it a C keyword? Is it simply a mistake and should be commented?</p>