On Mon, Jan 25, 2021 at 9:37 AM Ike Panhc <ike.pan@xxxxxxxxxxxxx> wrote: > > On 1/17/21 3:49 AM, Andy Shevchenko wrote: > > On Wed, Jan 13, 2021 at 8:23 PM Barnabás Pőcze <pobrn@xxxxxxxxxxxxxx> wrote: > >> > >> Consumers can differentiate an error from a successful read much more > >> easily if the read() call fails with the appropriate errno instead of > >> returning a magic string like "-1". > > > > Is user space ready for this (for the record, it seems an ABI breakage)? > > > > read() and getting errno looks sysfs/driver broken to me. I think > if button/method is not available, it's better to be something like > sysfs_emit(buf, "%d\n", -ENODEV) Either way it will be an ABI breakage. -- With Best Regards, Andy Shevchenko
