With this patch, 'gdb detach' correctly resumes the inferior execution 
after detaching the debugger.
The bug was caused by qemu asking gdb to execute a syscall (isatty) 
after the detach, and then waiting (forever) for the reply. I fixed this 
by properly setting gdb_syscall_mode appropriately in the 'detach' 
packet handling, so subsequent syscalls are solved by qemu rather than gdb.

I tested this manually.

Please commit it for me if accepted, since I don't have write privileges.

Thanks!
	Daniel.

2010-02-22  Daniel Gutson  <dgutson@codesourcery.com>

	* gdbstub.c (gdb_handle_packet): set
	gdb_syscall_mode properly.

-- 
Daniel Gutson
CodeSourcery
www.codesourcery.com