On Thu, Sep 17, 2020 at 04:50:06PM +0300, Andy Shevchenko wrote: > On Thu, Sep 17, 2020 at 3:09 PM Thierry Reding <[email protected]> > wrote: > > On Wed, Sep 09, 2020 at 01:39:59AM +0300, Dmitry Osipenko wrote: > > > Why? All of these functions "return 0 on success or a negative error > > code on failure", don't they? > > And what is the point of having ' < 0' in all those cases?
It's explicitly checking for the documented error cases. And you'll occasionally have a function that can return non-zero on success. Testing for < 0 is the safest way to check for failure in the majority of cases. Thierry
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