On Wed, Mar 08, 2017 at 10:26:14AM -0500, Jeff Layton wrote:
> On Wed, 2017-03-08 at 09:24 +0000, David Howells wrote:
> > Andreas Dilger <adilger@xxxxxxxxx> wrote:
> > > To test whether a path is a regular file (for example), one could write:
> > > .nf
> > > .in +4n
> > > rc = statx(AT_FDCWD, pathname, 0, STATX_TYPE, &stx);
> > > if (stx.stx_mask & STATX_TYPE && S_ISREG(sb.stx_mode)) {
> > > /* Handle regular file */
> > > }
> >
> > Good idea.
>
> Note that & and && have similar precedence, IIRC, so you probably want
> to wrap that flag check in parenthesis.
They're actually pretty far apart. & is priority 8 and && is priority 11.
But the fact that you thought they were similar shows that most of
us don't really know what C's operator precedence is (beyond + and *)
and we should err on the side of clarity by using the unnecessary parens.
> If the plan is to eventually (in some far away future) to deprecate
> stat(), then we probably don't want this manpage to refer to it as a
> canonical source of information. I say duplicate it here.
We haven't even deprecated select() in favour of poll() ... indeed,
pselect() was added. I can't imagine stat() ever being deprecated.
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