Hi,

> In any case, given that at least two people have lost time trying
> to understand what good was this for, I say we nuke it,  and get rid
> of *_sigio_trap in the process as well, which has calls that have been
> propagated to several targets by now.

the attached patch remove this unused piece of code.
Recompiled on x86/gnu-linux and no more instances found by grep.

Tristan.

2008-12-15  Tristan Gingold  <gingold@adacore.com>

	* inflow.c: Remove old_sigio, handle_sigio, old_fcntl_flags,
	set_sigio_trap, clear_sigio_trap definitions.
	* inferior.h: Remove set_sigio_trap and clear_sigio_trap declarations.
	* inf-ptrace.c (inf_ptrace_wait): Remove call to set_sigio_trap
	and clear_sigio_trap.
	* inf-ttrace.c (inf_ttrace_wait): Ditto.
	* linux-nat.c (linux_nat_wait): Ditto.
	* spu-linux-nat.c (spu_child_wait): Ditto.
	* rs6000-nat.c (rs6000_wait): Ditto.
	* target.c: Remove target_activity_function and target_activity_fd.
	* target.h: Remove target_activity_function and target_activity_fd
	declarations.