[CRIU] [PATCH] ptrace: add ability to get clear_tid_address

[Andrew Vagin]

We need this address for dumping and restoring processes.

Signe-off-by: Andrew Vagin <avagin at openvz.org>
---
 include/linux/ptrace.h |    1 +
 kernel/ptrace.c        |    3 +++
 2 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/include/linux/ptrace.h b/include/linux/ptrace.h
index c2f1f6a..28fadfa 100644
--- a/include/linux/ptrace.h
+++ b/include/linux/ptrace.h
@@ -50,6 +50,7 @@
 #define PTRACE_SEIZE		0x4206
 #define PTRACE_INTERRUPT	0x4207
 #define PTRACE_LISTEN		0x4208
+#define PTRACE_GET_TID_ADDRESS  0x4209
 
 /* flags in @data for PTRACE_SEIZE */
 #define PTRACE_SEIZE_DEVEL	0x80000000 /* temp flag for development */
diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index 00ab2ca..ed7fbe7 100644
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -845,6 +845,9 @@ int ptrace_request(struct task_struct *child, long request,
 		break;
 	}
 #endif
+	case PTRACE_GET_TID_ADDRESS:
+		return put_user(child->clear_child_tid, (int __user **) data);
+
 	default:
 		break;
 	}
-- 
1.7.1