toolbox: add "uptime" command

Prints elapsed real time since boot, as well as idle time and sleep time.

Change-Id: I97f482d6087e9f802d74e91147bf767e6b2d4f42
Signed-off-by: Mike Lockwood <lockwood@android.com>

toolbox/Android.mk

@@ -52,7 +52,8 @@ TOOLS := \
 	id \
 	vmstat \
 	nandread \
-        ionice
+	uptime \
+	ionice
 
 LOCAL_SRC_FILES:= \
 	toolbox.c \

toolbox/uptime.c

@@ -0,0 +1,88 @@
+/*
+ * Copyright (C) 2010 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 <sys/time.h>
+#include <linux/ioctl.h>
+#include <linux/rtc.h>
+#include <linux/android_alarm.h>
+#include <fcntl.h>
+#include <stdio.h>
+
+
+static void format_time(int time, char* buffer) {
+    int seconds, minutes, hours, days;
+
+    seconds = time % 60;
+    time /= 60;
+    minutes = time % 60;
+    time /= 60;
+    hours = time % 24;
+    days = time / 24;
+
+    if (days > 0)
+        sprintf(buffer, "%d days, %02d:%02d:%02d", days, hours, minutes, seconds);
+    else
+        sprintf(buffer, "%02d:%02d:%02d", hours, minutes, seconds);
+}
+
+int64_t elapsedRealtime()
+{
+    struct timespec ts;
+    int fd, result;
+
+    fd = open("/dev/alarm", O_RDONLY);
+    if (fd < 0)
+        return fd;
+
+   result = ioctl(fd, ANDROID_ALARM_GET_TIME(ANDROID_ALARM_ELAPSED_REALTIME), &ts);
+   close(fd);
+
+    if (result == 0)
+        return ts.tv_sec;
+    return -1;
+}
+
+int uptime_main(int argc, char *argv[])
+{
+    float up_time, idle_time;
+    char up_string[100], idle_string[100], sleep_string[100];
+    int elapsed;
+
+    FILE* file = fopen("/proc/uptime", "r");
+    if (!file) {
+        fprintf(stderr, "Could not open /proc/uptime\n");
+        return -1;
+    }
+    if (fscanf(file, "%f %f", &up_time, &idle_time) != 2) {
+        fprintf(stderr, "Could not parse /proc/uptime\n");
+        fclose(file);
+        return -1;
+    }
+    fclose(file);
+
+    elapsed = elapsedRealtime();
+    if (elapsed < 0) {
+        fprintf(stderr, "elapsedRealtime failed\n");
+        return -1;
+    }
+
+    format_time(elapsed, up_string);
+    format_time((int)idle_time, idle_string);
+    format_time((int)(elapsed - up_time), sleep_string);
+    printf("up time: %s, idle time: %s, sleep time: %s\n", up_string, idle_string, sleep_string);
+
+    return 0;
+}