Add libprocessgroup

libprocessgroup will allow Zygote to place processes
in a cgroup, and then kill the process and all forked processes
later.  lmkd will also kill all forked processes.

Bug: 15313911
Change-Id: I20404d0dbe448f1c475d2f4c61cccca462f9e544
diff --git a/libprocessgroup/Android.mk b/libprocessgroup/Android.mk
new file mode 100644
index 0000000..501321f
--- /dev/null
+++ b/libprocessgroup/Android.mk
@@ -0,0 +1,21 @@
+LOCAL_PATH := $(call my-dir)
+
+include $(CLEAR_VARS)
+LOCAL_SRC_FILES := processgroup.cpp
+LOCAL_MODULE := libprocessgroup
+LOCAL_SHARED_LIBRARIES := liblog
+LOCAL_C_INCLUDES := $(LOCAL_PATH)/include
+LOCAL_EXPORT_C_INCLUDE_DIRS := $(LOCAL_PATH)/include
+LOCAL_CFLAGS := -Wall -Werror
+LOCAL_REQUIRED_MODULE := processgroup_cleanup
+include external/libcxx/libcxx.mk
+include $(BUILD_SHARED_LIBRARY)
+
+include $(CLEAR_VARS)
+LOCAL_SRC_FILES := cleanup.cpp
+LOCAL_MODULE := processgroup_cleanup
+LOCAL_C_INCLUDES := $(LOCAL_PATH)/include
+LOCAL_CFLAGS := -Wall -Werror
+LOCAL_FORCE_STATIC_EXECUTABLE := true
+LOCAL_STATIC_LIBRARIES := libc libcutils
+include $(BUILD_EXECUTABLE)