liblog: Support for ANDROID_LOG_WRAP mode flag on reader
If ANDROID_LOG_WRAP is specified, add timeout=3600 to the reader
request. logd will comply by going to sleep with the socket open.
If the start time is about to wrap or get pruned in the specified log
buffers, then wakeup and dump the logs; or wakeup on timeout,
whichever comes first.
Bug: 25929746
Change-Id: I531b4317a20abcf3ba87d78c68fa2f268a4488ab
diff --git a/liblog/README b/liblog/README
index f29ac04..df1e68c 100644
--- a/liblog/README
+++ b/liblog/README
@@ -116,6 +116,10 @@
code, otherwise the android_logger_list_read call will block for new
entries.
+ The ANDROID_LOG_WRAP mode flag to the android_logger_list_alloc_time
+ signals logd to quiesce the reader until the buffer is about to prune
+ at the start time then proceed to dumping content.
+
The ANDROID_LOG_PSTORE mode flag to the android_logger_open is used to
switch from the active logs to the persistent logs from before the last
reboot.