diff --git a/liblog/include/log/log.h b/liblog/include/log/log.h
index 37d30bc..e592c5c 100644
--- a/liblog/include/log/log.h
+++ b/liblog/include/log/log.h
@@ -28,6 +28,7 @@
 #include <unistd.h>
 
 #include <android/log.h>
+#include <log/log_id.h>
 #include <log/log_main.h>
 #include <log/uio.h> /* helper to define iovec for portability */
 
@@ -75,16 +76,6 @@
 #endif
 
 /*
- * Send a simple string to the log.
- */
-int __android_log_buf_write(int bufID, int prio, const char* tag, const char* text);
-int __android_log_buf_print(int bufID, int prio, const char* tag, const char* fmt, ...)
-#if defined(__GNUC__)
-    __attribute__((__format__(printf, 4, 5)))
-#endif
-    ;
-
-/*
  * Simplified macro to send a verbose system log message using current LOG_TAG.
  */
 #ifndef SLOGV
@@ -321,25 +312,6 @@
         (void) __android_log_bswrite(_tag, _value);
 #endif
 
-#ifndef log_id_t_defined
-#define log_id_t_defined
-typedef enum log_id {
-    LOG_ID_MIN = 0,
-
-    LOG_ID_MAIN = 0,
-    LOG_ID_RADIO = 1,
-    LOG_ID_EVENTS = 2,
-    LOG_ID_SYSTEM = 3,
-    LOG_ID_CRASH = 4,
-    LOG_ID_SECURITY = 5,
-    LOG_ID_KERNEL = 6, /* place last, third-parties can not use it */
-
-    LOG_ID_MAX
-} log_id_t;
-#endif
-#define sizeof_log_id_t sizeof(typeof_log_id_t)
-#define typeof_log_id_t unsigned char
-
 /* --------------------------------------------------------------------- */
 
 /*
@@ -776,12 +748,6 @@
 
 #endif /* __linux__ */
 
-/*
- * log_id_t helpers
- */
-log_id_t android_name_to_log_id(const char* logName);
-const char* android_log_id_to_name(log_id_t log_id);
-
 /* --------------------------------------------------------------------- */
 
 #ifndef _ANDROID_USE_LIBLOG_SAFETYNET_INTERFACE
diff --git a/liblog/include/log/log_id.h b/liblog/include/log/log_id.h
new file mode 100644
index 0000000..3078e4e
--- /dev/null
+++ b/liblog/include/log/log_id.h
@@ -0,0 +1,63 @@
+/*
+ * Copyright (C) 2005-2017 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef _LIBS_LOG_LOG_ID_H
+#define _LIBS_LOG_LOG_ID_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifndef log_id_t_defined
+#define log_id_t_defined
+typedef enum log_id {
+    LOG_ID_MIN = 0,
+
+    LOG_ID_MAIN = 0,
+    LOG_ID_RADIO = 1,
+    LOG_ID_EVENTS = 2,
+    LOG_ID_SYSTEM = 3,
+    LOG_ID_CRASH = 4,
+    LOG_ID_SECURITY = 5,
+    LOG_ID_KERNEL = 6, /* place last, third-parties can not use it */
+
+    LOG_ID_MAX
+} log_id_t;
+#endif
+#define sizeof_log_id_t sizeof(typeof_log_id_t)
+#define typeof_log_id_t unsigned char
+
+/*
+ * Send a simple string to the log.
+ */
+int __android_log_buf_write(int bufID, int prio, const char* tag, const char* text);
+int __android_log_buf_print(int bufID, int prio, const char* tag, const char* fmt, ...)
+#if defined(__GNUC__)
+    __attribute__((__format__(printf, 4, 5)))
+#endif
+    ;
+
+/*
+ * log_id_t helpers
+ */
+log_id_t android_name_to_log_id(const char* logName);
+const char* android_log_id_to_name(log_id_t log_id);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _LIBS_LOG_LOG_ID_H */
diff --git a/liblog/include_vndk/log/log.h b/liblog/include_vndk/log/log.h
index 5d720f6..7a776d8 100644
--- a/liblog/include_vndk/log/log.h
+++ b/liblog/include_vndk/log/log.h
@@ -4,10 +4,10 @@
 #define _LIBS_LOG_LOG_H
 
 #include <android/log.h>
+#include <log/log_id.h>
 #include <log/log_main.h>
 
 /*The following files will be included once they are available*/
-/*#include <log/log_id.h>*/
 /*#include <log/log_radio.h>*/
 
 /*
diff --git a/liblog/include_vndk/log/log_id.h b/liblog/include_vndk/log/log_id.h
new file mode 120000
index 0000000..dce92b9
--- /dev/null
+++ b/liblog/include_vndk/log/log_id.h
@@ -0,0 +1 @@
+../../include/log/log_id.h
\ No newline at end of file
diff --git a/liblog/tests/Android.mk b/liblog/tests/Android.mk
index ec5a99b..6eba86e 100644
--- a/liblog/tests/Android.mk
+++ b/liblog/tests/Android.mk
@@ -55,7 +55,8 @@
     -fno-builtin \
 
 test_src_files := \
-    liblog_test.cpp
+    liblog_test.cpp \
+    log_id_test.cpp
 
 # to prevent breaking the build if bionic not relatively visible to us
 ifneq ($(wildcard $(LOCAL_PATH)/../../../../bionic/libc/bionic/libc_logging.cpp),)
diff --git a/liblog/tests/liblog_test.cpp b/liblog/tests/liblog_test.cpp
index ec0352e..d03c6d1 100644
--- a/liblog/tests/liblog_test.cpp
+++ b/liblog/tests/liblog_test.cpp
@@ -19,6 +19,7 @@
 #include <errno.h>
 #include <fcntl.h>
 #include <inttypes.h>
+#include <pthread.h>
 #include <semaphore.h>
 #include <signal.h>
 #include <stdio.h>
@@ -54,44 +55,6 @@
           || (_rc == -EAGAIN));    \
     _rc; })
 
-TEST(liblog, __android_log_buf_print) {
-#ifdef __ANDROID__
-    EXPECT_LT(0, __android_log_buf_print(LOG_ID_RADIO, ANDROID_LOG_INFO,
-                                         "TEST__android_log_buf_print",
-                                         "radio"));
-    usleep(1000);
-    EXPECT_LT(0, __android_log_buf_print(LOG_ID_SYSTEM, ANDROID_LOG_INFO,
-                                         "TEST__android_log_buf_print",
-                                         "system"));
-    usleep(1000);
-    EXPECT_LT(0, __android_log_buf_print(LOG_ID_MAIN, ANDROID_LOG_INFO,
-                                         "TEST__android_log_buf_print",
-                                         "main"));
-    usleep(1000);
-#else
-    GTEST_LOG_(INFO) << "This test does nothing.\n";
-#endif
-}
-
-TEST(liblog, __android_log_buf_write) {
-#ifdef __ANDROID__
-    EXPECT_LT(0, __android_log_buf_write(LOG_ID_RADIO, ANDROID_LOG_INFO,
-                                         "TEST__android_log_buf_write",
-                                         "radio"));
-    usleep(1000);
-    EXPECT_LT(0, __android_log_buf_write(LOG_ID_SYSTEM, ANDROID_LOG_INFO,
-                                         "TEST__android_log_buf_write",
-                                         "system"));
-    usleep(1000);
-    EXPECT_LT(0, __android_log_buf_write(LOG_ID_MAIN, ANDROID_LOG_INFO,
-                                         "TEST__android_log_buf_write",
-                                         "main"));
-    usleep(1000);
-#else
-    GTEST_LOG_(INFO) << "This test does nothing.\n";
-#endif
-}
-
 TEST(liblog, __android_log_btwrite) {
 #ifdef __ANDROID__
     int intBuf = 0xDEADBEEF;
@@ -114,43 +77,6 @@
 }
 
 #ifdef __ANDROID__
-static void* ConcurrentPrintFn(void *arg) {
-    int ret = __android_log_buf_print(LOG_ID_MAIN, ANDROID_LOG_INFO,
-                                  "TEST__android_log_print", "Concurrent %" PRIuPTR,
-                                  reinterpret_cast<uintptr_t>(arg));
-    return reinterpret_cast<void*>(ret);
-}
-#endif
-
-#define NUM_CONCURRENT 64
-#define _concurrent_name(a,n) a##__concurrent##n
-#define concurrent_name(a,n) _concurrent_name(a,n)
-
-TEST(liblog, concurrent_name(__android_log_buf_print, NUM_CONCURRENT)) {
-#ifdef __ANDROID__
-    pthread_t t[NUM_CONCURRENT];
-    int i;
-    for (i=0; i < NUM_CONCURRENT; i++) {
-        ASSERT_EQ(0, pthread_create(&t[i], NULL,
-                                    ConcurrentPrintFn,
-                                    reinterpret_cast<void *>(i)));
-    }
-    int ret = 0;
-    for (i=0; i < NUM_CONCURRENT; i++) {
-        void* result;
-        ASSERT_EQ(0, pthread_join(t[i], &result));
-        int this_result = reinterpret_cast<uintptr_t>(result);
-        if ((0 == ret) && (0 != this_result)) {
-            ret = this_result;
-        }
-    }
-    ASSERT_LT(0, ret);
-#else
-    GTEST_LOG_(INFO) << "This test does nothing.\n";
-#endif
-}
-
-#ifdef __ANDROID__
 std::string popenToString(std::string command) {
     std::string ret;
 
diff --git a/liblog/tests/log_id_test.cpp b/liblog/tests/log_id_test.cpp
new file mode 100644
index 0000000..3241534
--- /dev/null
+++ b/liblog/tests/log_id_test.cpp
@@ -0,0 +1,125 @@
+/*
+ * Copyright (C) 2013-2017 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <inttypes.h>
+#include <pthread.h>
+#include <stdio.h>
+#include <unistd.h>
+
+#include <gtest/gtest.h>
+// Test the APIs in this standalone include file
+#include <log/log_id.h>
+
+// We do not want to include <android/log.h> to acquire ANDROID_LOG_INFO for
+// include file API purity.  We do however want to allow the _option_ that
+// log/log_id.h could include this file, or related content, in the future.
+#ifndef __android_LogPriority_defined
+# define ANDROID_LOG_INFO 4
+#endif
+
+TEST(liblog, log_id) {
+#ifdef __ANDROID__
+    int count = 0;
+
+    for(int i = LOG_ID_MIN; i < LOG_ID_MAX; ++i) {
+        log_id_t id = static_cast<log_id_t>(i);
+        const char *name = android_log_id_to_name(id);
+        if (id != android_name_to_log_id(name)) {
+            continue;
+        }
+        ++count;
+        fprintf(stderr, "log buffer %s\r", name);
+    }
+    ASSERT_EQ(LOG_ID_MAX, count);
+#else
+    GTEST_LOG_(INFO) << "This test does nothing.\n";
+#endif
+}
+
+TEST(liblog, __android_log_buf_print) {
+#ifdef __ANDROID__
+    EXPECT_LT(0, __android_log_buf_print(LOG_ID_RADIO, ANDROID_LOG_INFO,
+                                         "TEST__android_log_buf_print",
+                                         "radio"));
+    usleep(1000);
+    EXPECT_LT(0, __android_log_buf_print(LOG_ID_SYSTEM, ANDROID_LOG_INFO,
+                                         "TEST__android_log_buf_print",
+                                         "system"));
+    usleep(1000);
+    EXPECT_LT(0, __android_log_buf_print(LOG_ID_MAIN, ANDROID_LOG_INFO,
+                                         "TEST__android_log_buf_print",
+                                         "main"));
+    usleep(1000);
+#else
+    GTEST_LOG_(INFO) << "This test does nothing.\n";
+#endif
+}
+
+TEST(liblog, __android_log_buf_write) {
+#ifdef __ANDROID__
+    EXPECT_LT(0, __android_log_buf_write(LOG_ID_RADIO, ANDROID_LOG_INFO,
+                                         "TEST__android_log_buf_write",
+                                         "radio"));
+    usleep(1000);
+    EXPECT_LT(0, __android_log_buf_write(LOG_ID_SYSTEM, ANDROID_LOG_INFO,
+                                         "TEST__android_log_buf_write",
+                                         "system"));
+    usleep(1000);
+    EXPECT_LT(0, __android_log_buf_write(LOG_ID_MAIN, ANDROID_LOG_INFO,
+                                         "TEST__android_log_buf_write",
+                                         "main"));
+    usleep(1000);
+#else
+    GTEST_LOG_(INFO) << "This test does nothing.\n";
+#endif
+}
+
+#ifdef __ANDROID__
+static void* ConcurrentPrintFn(void *arg) {
+    int ret = __android_log_buf_print(LOG_ID_MAIN, ANDROID_LOG_INFO,
+                                  "TEST__android_log_print", "Concurrent %" PRIuPTR,
+                                  reinterpret_cast<uintptr_t>(arg));
+    return reinterpret_cast<void*>(ret);
+}
+#endif
+
+#define NUM_CONCURRENT 64
+#define _concurrent_name(a,n) a##__concurrent##n
+#define concurrent_name(a,n) _concurrent_name(a,n)
+
+TEST(liblog, concurrent_name(__android_log_buf_print, NUM_CONCURRENT)) {
+#ifdef __ANDROID__
+    pthread_t t[NUM_CONCURRENT];
+    int i;
+    for (i=0; i < NUM_CONCURRENT; i++) {
+        ASSERT_EQ(0, pthread_create(&t[i], NULL,
+                                    ConcurrentPrintFn,
+                                    reinterpret_cast<void *>(i)));
+    }
+    int ret = 0;
+    for (i=0; i < NUM_CONCURRENT; i++) {
+        void* result;
+        ASSERT_EQ(0, pthread_join(t[i], &result));
+        int this_result = reinterpret_cast<uintptr_t>(result);
+        if ((0 == ret) && (0 != this_result)) {
+            ret = this_result;
+        }
+    }
+    ASSERT_LT(0, ret);
+#else
+    GTEST_LOG_(INFO) << "This test does nothing.\n";
+#endif
+}