[patch] Break by Ctrl-C before first syscall SIGSTOPs the traced process

[Roland McGrath]

> 2007-06-11  Jan Kratochvil  <jan.kratochvil at redhat.com>
> 
> 	Never interrupt when the attached traced process would be left stopped.
> 	* strace.c (main): `-p' attaching moved to ...
> 	(startup_attach): ... a new function, renamed a variable C to TCBI.
> 	Block interrupting signals since the first tracee has been attached.
> 	New comment about INTERRUPTED in the nonthreaded case.
> 	[LINUX] (startup_attach): Check INTERRUPTED after each attached thread.
> 	(main): Command spawning moved to ...
> 	(startup_child): ... a new function, replaced RETURN with EXIT.
> 	[LINUX] (detach): New variable CATCH_SIGSTOP, do not signal
> 	new SIGSTOP for processes still in TCB_STARTUP.
> 	(main): Move signals and BLOCKED_SET init before the tracees attaching,
> 	[SUNOS4] (trace): Removed fixvfork () call as a dead code, SIGSTOP must
> 	have been already caught before clearing TCB_STARTUP.
> 	(trace): Removed the `!WIFSTOPPED(status)' dead code.
> 	Clear TCB_STARTUP only in the case the received signal was SIGSTOP.
> 	New comment when `TCB_BPTSET && TCB_STARTUP' combination can be set.
> 	Code advisory: Roland McGrath
> 	Fixes RH#240986.

Committed.


Thanks,
Roland