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Refactor ptrace extended event status.

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This commit implements functions for identifying and extracting extended
ptrace event information from a Linux wait status.  These are just
convenience functions intended to hide the ">> 16" used to extract the
event from the wait status word, replacing the hard-coded shift with a more
descriptive function call.  This is preparatory work for implementation of
follow-fork and detach-on-fork for extended-remote linux targets.

gdb/ChangeLog:

	* linux-nat.c (linux_handle_extended_wait): Call
	linux_ptrace_get_extended_event.
	(wait_lwp): Call linux_is_extended_waitstatus.
	(linux_nat_filter_event): Call linux_ptrace_get_extended_event
	and linux_is_extended_waitstatus.
	* nat/linux-ptrace.c (linux_test_for_tracefork): Call
	linux_ptrace_get_extended_event.
	(linux_ptrace_get_extended_event): New function.
	(linux_is_extended_waitstatus): New function.
	* nat/linux-ptrace.h (linux_ptrace_get_extended_event)
	(linux_is_extended_waitstatus): New declarations.

gdb/gdbserver/ChangeLog:

	* linux-low.c (handle_extended_wait): Call
	linux_ptrace_get_extended_event.
	(get_stop_pc, get_detach_signal, linux_low_filter_event): Call
	linux_is_extended_waitstatus.

---
This commit is contained in:
Don Breazeal
2014-09-19 10:54:34 -07:00
parent e00d879a2e
commit 89a5711c56
6 changed files with 51 additions and 9 deletions
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18
gdb/nat/linux-ptrace.c
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@ -416,7 +416,7 @@ linux_test_for_tracefork (int child_pid)
/* Check if we received a fork event notification. */
if (ret == child_pid && WIFSTOPPED (status)
&& status >> 16 == PTRACE_EVENT_FORK)
&& linux_ptrace_get_extended_event (status) == PTRACE_EVENT_FORK)
{
/* We did receive a fork event notification. Make sure its PID
is reported. */
@ -550,3 +550,19 @@ linux_ptrace_set_additional_flags (int flags)
{
additional_flags = flags;
}
/* Extract extended ptrace event from wait status. */
int
linux_ptrace_get_extended_event (int wstat)
{
return (wstat >> 16);
}
/* Determine whether wait status denotes an extended event. */
int
linux_is_extended_waitstatus (int wstat)
{
return (linux_ptrace_get_extended_event (wstat) != 0);
}