On Thu, Jun 01, 2006 at 12:05:23PM +0930, Greg 'groggy' Lehey wrote:
> On Wednesday, 31 May 2006 at 13:15:29 +0000, Maxim Konovalov wrote:
> > maxim       2006-05-31 13:15:29 UTC
> >
> >   FreeBSD src repository
> >
> >   Modified files:
> >     sys/ufs/ufs          ufs_vnops.c
> >   Log:
> >   o According to POSIX, the result of ftruncate(2) is unspecified
> >   for file types other than VREG, VDIR and shared memory objects.
> >   We already handle VREG, VLNK and VDIR cases.  Silently ignore
> >
> >   Revision  Changes    Path
> >   1.276     +22 -4     src/sys/ufs/ufs/ufs_vnops.c
> 
> Is this worth a man page update?

Undoubtedly.  Does the attached look like enough?  I'm not sure if we
want to add a STANDARDS section for this when it's valid behaviour.

Ceri
-- 
That must be wonderful!  I don't understand it at all.
                                                  -- Moliere
Index: src/lib/libc/sys/truncate.2
===================================================================
RCS file: /home/ncvs/src/lib/libc/sys/truncate.2,v
retrieving revision 1.17
diff -u -r1.17 truncate.2
--- src/lib/libc/sys/truncate.2 20 Jan 2005 09:17:05 -0000      1.17
+++ src/lib/libc/sys/truncate.2 1 Jun 2006 09:47:19 -0000
@@ -32,7 +32,7 @@
 .\"     @(#)truncate.2 8.1 (Berkeley) 6/4/93
 .\" $FreeBSD: src/lib/libc/sys/truncate.2,v 1.17 2005/01/20 09:17:05 ru Exp $
 .\"
-.Dd June 4, 1993
+.Dd June 1, 2006
 .Dt TRUNCATE 2
 .Os
 .Sh NAME
@@ -69,6 +69,10 @@
 the file must be open for writing.
 .Sh RETURN VALUES
 .Rv -std
+If the file to be modified is not a directory or
+a regular file, the
+.Fn truncate
+call will return the value 0.
 .Sh ERRORS
 The
 .Fn truncate

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