On Tue, Jul 07, 2020 at 04:49:31PM +0200, Frank Schäfer wrote: > Hi, > > I recently noticed that read() from a usb-serial device does not fail > after the device got removed. > Is this really the correct/expected behavior or a bug ? > > I would expect it to return -1 and set an appropriate errno, but it > returns 0 (no error, no bytes read) instead. > > According to the glibc developers "glibc just calls into the kernel and > reports back whatever it receives from there." Yeah, this is the expected behaviour for a hung up tty (see poll(2) or the POSIX spec). Johan
