Commit: bd36696a16d3107c9e9503d120d7455dcbfd3fe6 - system-coremmmm (git)

system/corennnnn

Commit MetaInfo

• Revision: bd36696a16d3107c9e9503d120d7455dcbfd3fe6 (tree)
• Time: 2016-09-08 04:49:08
• Author: Mark Salyzyn <salyzyn@goog...>
• Commiter: Narayan Kamath

Log Message

liblog: add android_log_close()

Bug: 30963384

(cherry picked from commit df7a4c6bae5f85532d79a93b7d9197a2aab17825)

(cherry picked from commit c12d3d250ceb6a4380d2fcaf7f6d30bdea200dad)

Change-Id: Id4313e99bf86b41c3713e1c2db0242d12aeb8bb7

Change Summary

• modified: include/android/log.h
• modified: liblog/logger_write.c
• modified: liblog/tests/liblog_test.cpp

Incremental Difference

--- a/include/android/log.h
+++ b/include/android/log.h
@@ -89,6 +89,11 @@ typedef enum android_LogPriority {
 } android_LogPriority;
 
 /*
+ * Release any logger resources (a new log write will immediately re-acquire)
+ */
+void __android_log_close();
+
+/*
  * Send a simple string to the log.
  */
 int __android_log_write(int prio, const char *tag, const char *text);

--- a/liblog/logger_write.c
+++ b/liblog/logger_write.c
@@ -132,6 +132,41 @@ LIBLOG_ABI_PUBLIC int __android_log_dev_available()
     }
     return kLogNotAvailable;
 }
+/*
+ * Release any logger resources. A new log write will immediately re-acquire.
+ */
+LIBLOG_ABI_PUBLIC void __android_log_close()
+{
+    struct android_log_transport_write *transport;
+
+    __android_log_lock();
+
+    write_to_log = __write_to_log_init;
+
+    /*
+     * Threads that are actively writing at this point are not held back
+     * by a lock and are at risk of dropping the messages with a return code
+     * -EBADF. Prefer to return error code than add the overhead of a lock to
+     * each log writing call to guarantee delivery. In addition, anyone
+     * calling this is doing so to release the logging resources and shut down,
+     * for them to do so with outstanding log requests in other threads is a
+     * disengenuous use of this function.
+     */
+
+    write_transport_for_each(transport, &__android_log_persist_write) {
+        if (transport->close) {
+            (*transport->close)();
+        }
+    }
+
+    write_transport_for_each(transport, &__android_log_transport_write) {
+        if (transport->close) {
+            (*transport->close)();
+        }
+    }
+
+    __android_log_unlock();
+}
 
 /* log_init_lock assumed */
 static int __write_to_log_initialize()

--- a/liblog/tests/liblog_test.cpp
+++ b/liblog/tests/liblog_test.cpp
@@ -132,12 +132,17 @@ TEST(liblog, __android_log_btwrite__android_logger_list_read) {
     ASSERT_TRUE(NULL != (logger_list = android_logger_list_open(
         LOG_ID_EVENTS, ANDROID_LOG_RDONLY | ANDROID_LOG_NONBLOCK, 1000, pid)));
 
+    // Check that we can close and reopen the logger
     log_time ts(CLOCK_MONOTONIC);
-
     ASSERT_LT(0, __android_log_btwrite(0, EVENT_TYPE_LONG, &ts, sizeof(ts)));
+    __android_log_close();
+
+    log_time ts1(CLOCK_MONOTONIC);
+    ASSERT_LT(0, __android_log_btwrite(0, EVENT_TYPE_LONG, &ts1, sizeof(ts1)));
     usleep(1000000);
 
     int count = 0;
+    int second_count = 0;
 
     for (;;) {
         log_msg log_msg;
@@ -161,10 +166,13 @@ TEST(liblog, __android_log_btwrite__android_logger_list_read) {
         log_time tx(eventData + 4 + 1);
         if (ts == tx) {
             ++count;
+        } else if (ts1 == tx) {
+            ++second_count;
         }
     }
 
     EXPECT_EQ(1, count);
+    EXPECT_EQ(1, second_count);
 
     android_logger_list_close(logger_list);
 }