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update to match current common implementation on NetBSD - [f]truncate() 

normally lengtens the file if it's shorter than specified length
also change wording slighly, to match wording in SUS

XXX someone should check how much of SUS truncate(2) specification is true
XXX on NetBSD and update this manpage accordingly
This commit is contained in:
jdolecek 2000-05-28 09:41:52 +00:00
parent dad58e313b
commit 07506ce5eb
1 changed files with 11 additions and 5 deletions
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16
lib/libc/sys/truncate.2
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@ -1,4 +1,4 @@
.\" $NetBSD: truncate.2,v 1.10 1999/12/02 21:42:40 kleink Exp $
.\" $NetBSD: truncate.2,v 1.11 2000/05/28 09:41:52 jdolecek Exp $
.\"
.\" Copyright (c) 1983, 1991, 1993
.\" The Regents of the University of California. All rights reserved.
@ -54,14 +54,20 @@ causes the file named by
.Fa path
or referenced by
.Fa fd
to be truncated to at most
to have a size of
.Fa length
bytes in size. If the file previously
bytes. If the file previously
was larger than this size, the extra data
is lost.
is discarded. If it was previously shorter than
.Fa length ,
its size is increased to the specified value and
the extended area appears as if it were zero-filled.
With
.Fn ftruncate ,
the file must be open for writing.
the file must be open for writing; for
.Fn truncate ,
the process must have write permissions for the file.
.Sh RETURN VALUES
A value of 0 is returned if the call succeeds. If the call
fails a -1 is returned, and the global variable