FRELE returns an int not void. It is actually the return value

of fdrop() (or 0 if the ref count is non-zero).  From Kanonenvogel

diff --git a/share/man/man9/file.9 b/share/man/man9/file.9
index 7eba6a6..7ff402a 100644 (file)
--- a/share/man/man9/file.9
+++ b/share/man/man9/file.9
@@ -1,4 +1,4 @@
-.\"     $OpenBSD: file.9,v 1.12 2013/06/04 19:27:06 schwarze Exp $
+.\"     $OpenBSD: file.9,v 1.13 2015/04/30 11:46:16 millert Exp $
 .\"
 .\" Copyright (c) 2002 Artur Grabowski <art@openbsd.org>
 .\" All rights reserved.
@@ -22,7 +22,7 @@
 .\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 .\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 .\"
-.Dd $Mdocdate: June 4 2013 $
+.Dd $Mdocdate: April 30 2015 $
 .Dt FILE 9
 .Os
 .Sh NAME
@@ -37,7 +37,7 @@
 .Fn fdrelease "struct proc *p" "int fd"
 .Ft void
 .Fn FREF "struct file *fp"
-.Ft void
+.Ft int
 .Fn FRELE "struct file *fp" "struct proc *p"
 .Ft struct file *
 .Fn fd_getfile "struct filedesc *fdp" "int fd"