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Ryan Houdek
27309114be
Noticed recently that `FEXServer -w` was broken and couldn't understand why. Turns out that FHU syscall handling was /always/ falling down the `#else` path in the handlers since cmake `add_definitions` follows folder scoping rules. This means it was always returning -1, which was causing FEXServer's pidfd_open usage to always receive -1, which meant the sendmsg with FD was always failing, which meant the `FEXServer -w` would forever wait for a message that was never sent. Converting the utility over to a target not only fixes definition scoping problems, but also makes the other paths actually work. This found some compiling bugs and instead lets us define SYS_pidfd_open if it doesn't exist. Letting the kernel return the ENOSYS if it doesn't exist on that platform. Main thing, fixes FEXServer -w hanging forever.