linux-kernel - [PATCH 4/5] ptrace: renumber PTRACE_EVENT_STOP so that future new options and events can match

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Date:	Fri, 10 Feb 2012 15:43:10 +0100
From:	Denys Vlasenko <vda.linux@...glemail.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Oleg Nesterov <oleg@...hat.com>, Tejun Heo <tj@...nel.org>,
	Pedro Alves <palves@...hat.com>,
	Jan Kratochvil <jan.kratochvil@...hat.com>,
	linux-kernel@...r.kernel.org
Cc:	Denys Vlasenko <vda.linux@...glemail.com>
Subject: [PATCH 4/5] ptrace: renumber PTRACE_EVENT_STOP so that future new options and events can match

PTRACE_EVENT_foo and PTRACE_O_TRACEfoo used to match.

New PTRACE_EVENT_STOP is the first event which has no corresponding
PTRACE_O_TRACE option. If we will ever want to add another such option,
its PTRACE_EVENT's value will collide with PTRACE_EVENT_STOP's value.

This patch changes PTRACE_EVENT_STOP value to prevent this.

While at it, added a comment - the one atop PTRACE_EVENT block,
saying "Wait extended result codes for the above trace options",
is not true for PTRACE_EVENT_STOP.

Signed-off-by: Denys Vlasenko <vda.linux@...glemail.com>
---
 include/linux/ptrace.h |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/include/linux/ptrace.h b/include/linux/ptrace.h
index 06be6a3..ec6571c 100644
--- a/include/linux/ptrace.h
+++ b/include/linux/ptrace.h
@@ -61,7 +61,8 @@
 #define PTRACE_EVENT_EXEC	4
 #define PTRACE_EVENT_VFORK_DONE	5
 #define PTRACE_EVENT_EXIT	6
-#define PTRACE_EVENT_STOP	7
+/* Extended result codes which enabled by means other than options.  */
+#define PTRACE_EVENT_STOP	128
 
 /* options set using PTRACE_SETOPTIONS */
 #define PTRACE_O_TRACESYSGOOD	1
-- 
1.7.7.6

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