On 24 Jan 2021, at 01:27, Samuel Thibault <samuel.thiba...@gnu.org> wrote: > Jessica Clarke, le dim. 24 janv. 2021 01:16:13 +0000, a ecrit: >> maybe Hurd should also be nice. > > Right, we could hack ioctl into doing if (request == TIOCFLUSH && !arg) > arg = &zero. > > That still leaves us with applications that don't even pass an argument, > but I guess we can convince their maintainers to just fix their code.
Yeah that has never correct. It used to take a single pointer argument, no varargs (presumably because varargs was even weirder in K&R C and awkward for syscalls), and that was still the case in 4.2BSD when TIOCFLUSH started accepting a non-NULL argument for flags. Only NULL and a pointer to an int have ever been valid. Jess
