----- Original Message -----
> From: "Cyril Hrubis" <chru...@suse.cz>
> To: "Guangwen Feng" <fenggw-f...@cn.fujitsu.com>
> Cc: ltp-list@lists.sourceforge.net
> Sent: Tuesday, 14 July, 2015 4:24:01 PM
> Subject: Re: [LTP] [PATCH] lib/safe_macros.c: fix safe_write() and
> safe_pwrite()
>
> Hi!
> > The len_strict is ineffective in byte length verification
> > because of the improper if-condition.
> >
> > Signed-off-by: Guangwen Feng <fenggw-f...@cn.fujitsu.com>
> > ---
> > lib/safe_macros.c | 4 ++--
> > 1 file changed, 2 insertions(+), 2 deletions(-)
> >
> > diff --git a/lib/safe_macros.c b/lib/safe_macros.c
> > index a3d997c..173d72f 100644
> > --- a/lib/safe_macros.c
> > +++ b/lib/safe_macros.c
> > @@ -414,7 +414,7 @@ ssize_t safe_write(const char *file, const int lineno,
> > void (cleanup_fn) (void),
> > ssize_t rval;
> >
> > rval = write(fildes, buf, nbyte);
> > - if ((len_strict == 0 && rval == -1) || (size_t)rval != nbyte) {
> > + if (rval == -1 || (len_strict && (size_t)rval != nbyte)) {
> > tst_brkm(TBROK | TERRNO, cleanup_fn,
> > "%s:%d: write(%d,%p,%zu) failed",
> > file, lineno, fildes, buf, rval);
>
> Ok, this was wrong because with len_strict == 1 and rval == -1 we will
> cast -1 to (size_t) which will yield 2^64 - 1. In practice this was
> working fine since nobody would call write with such large buffer...
>
> Newertless it's better as it is now, but commit message could have been
> better since as far as I can see the len_strict flag was working fine.
>
> Because when len_strict == 1 the result was computed as:
>
> if ((0 && whatever) || rval != nbyte) -> if (0 || rval != nbyte) -> if (rval
> != nbyte)
>
> which worked fine for all practical purposes. Or am I missing something?
Also, when len_strict == 0 and less bytes were written than requested,
it would report TBROK. With len_strict == 0 it should TBROK only when
rval is -1.
Regards,
Jan
>
> --
> Cyril Hrubis
> chru...@suse.cz
>
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