logd: liblog: logcat: Add Statistics

- logd add statistical collection and formatting
- liblog add android_logger_get_statistics call
- logcat add -S flag
- logcat add -b all

(cherry picked from commit 51a29c8dc445e4fb89860561933e54a231e6ffb4)

Change-Id: I521753b1969ecd4590c956aeeb1557d101059d67

2 files changed, 40 insertions, 0 deletions

diff --git a/liblog/log_read.c b/liblog/log_read.c
index 889442db9..6f6fe5f2c 100644
--- a/liblog/log_read.c
+++ b/liblog/log_read.c
@@ -357,6 +357,32 @@ int android_logger_get_log_version(struct logger *logger UNUSED)
     return 3;
 }
 
+/*
+ * returns statistics
+ */
+ssize_t android_logger_get_statistics(struct logger_list *logger_list,
+                                      char *buf, size_t len)
+{
+    struct listnode *node;
+    struct logger *logger;
+    char *cp = buf;
+    size_t remaining = len;
+    size_t n;
+
+    n = snprintf(cp, remaining, "getStatistics");
+    n = min(n, remaining);
+    remaining -= n;
+    cp += n;
+
+    logger_for_each(logger, logger_list) {
+        n = snprintf(cp, remaining, " %d", logger->id);
+        n = min(n, remaining);
+        remaining -= n;
+        cp += n;
+    }
+    return send_log_msg(NULL, NULL, buf, len);
+}
+
 struct logger_list *android_logger_list_alloc(int mode,
                                               unsigned int tail,
                                               pid_t pid)
diff --git a/liblog/log_read_kern.c b/liblog/log_read_kern.c
index b4547295f..59a7a0b19 100644
--- a/liblog/log_read_kern.c
+++ b/liblog/log_read_kern.c
@@ -51,6 +51,8 @@ typedef char bool;
          logger != node_to_item(&(logger_list)->node, struct logger, node); \
          logger = node_to_item((logger)->node.next, struct logger, node))
 
+#define UNUSED __attribute__((unused))
+
 /* In the future, we would like to make this list extensible */
 static const char *LOG_NAME[LOG_ID_MAX] = {
     [LOG_ID_MAIN] = "main",
@@ -248,6 +250,18 @@ int android_logger_get_log_version(struct logger *logger)
     return (ret < 0) ? 1 : ret;
 }
 
+/*
+ * returns statistics
+ */
+
+ssize_t android_logger_get_statistics(struct logger_list *logger_list UNUSED,
+                                      char *buf, size_t len)
+{
+    static const char unsupported[] = "18\nNot Supported\n\f";
+    strncpy(buf, unsupported, len);
+    return -ENOTSUP;
+}
+
 struct logger_list *android_logger_list_alloc(int mode,
                                               unsigned int tail,
                                               pid_t pid)