liblog: Add private interfaces for buffer size properties

Add private function __android_logger_get_buffer_size() to read
properties and compose the default buffer size.  This interface
complements the existing android_looger_get_size() which returns
the logd setting which can differ at runtime.  For use in logd
and dumpstate.  Side effect is we also add the private functions
__android_logger_property_get_bool() and
__android_logger_valid_buffer_size() for reuse in logd.

Test: gTest liblog-unit-test, logd-unit-tests and logcat-unit-tests in
      combination with commit 'logd: Use private interfaces for
      buffer size properties'
Bug: 31750617
Change-Id: Id95cb68f775ef6b427c122e10f6f8291d336d184

1 files changed, 15 insertions, 0 deletions

diff --git a/include/private/android_logger.h b/include/private/android_logger.h
index 94095d1df..02764d3d3 100644
--- a/include/private/android_logger.h
+++ b/include/private/android_logger.h
@@ -21,6 +21,7 @@
 
 /* Android private interfaces */
 
+#include <stdbool.h>
 #include <stdint.h>
 #include <sys/types.h>
 
@@ -132,6 +133,20 @@ int __android_log_security(); /* Device Owner is present */
 
 int __android_log_is_debuggable();
 
+#define BOOL_DEFAULT_FLAG_TRUE_FALSE 0x1
+#define BOOL_DEFAULT_FALSE       0x0     /* false if property not present   */
+#define BOOL_DEFAULT_TRUE        0x1     /* true if property not present    */
+#define BOOL_DEFAULT_FLAG_PERSIST    0x2 /* <key>, persist.<key>, ro.<key>  */
+#define BOOL_DEFAULT_FLAG_ENG        0x4 /* off for user                    */
+#define BOOL_DEFAULT_FLAG_SVELTE     0x8 /* off for low_ram                 */
+bool __android_logger_property_get_bool(const char *key, int flag);
+
+#define LOG_BUFFER_SIZE (256 * 1024) /* Tuned with ro.logd.size per-platform */
+#define LOG_BUFFER_MIN_SIZE (64 * 1024UL)
+#define LOG_BUFFER_MAX_SIZE (256 * 1024 * 1024UL)
+unsigned long __android_logger_get_buffer_size(log_id_t logId);
+bool __android_logger_valid_buffer_size(unsigned long value);
+
 #if defined(__cplusplus)
 }
 #endif