From 12235947ebc36206f43e52debc42de9b86d86866 Mon Sep 17 00:00:00 2001
From: Elliott Hughes <enh@google.com>
Date: Fri, 20 Mar 2015 11:14:50 -0700
Subject: [PATCH] Remove /dev/alarm cruft from uptime.

Our uptime is very different from the regular one, and usefully so, so
this code will live on. Remove dead bits.

Also fix the annoying "1 days" bug while I'm here.

Change-Id: Ied5403ba96dcc5eddd4d386b59c6fcdea3209881
---
 toolbox/uptime.c | 77 +++++++++++++-----------------------------------
 1 file changed, 21 insertions(+), 56 deletions(-)

diff --git a/toolbox/uptime.c b/toolbox/uptime.c
index 2dd808443..ebfb15e5a 100644
--- a/toolbox/uptime.c
+++ b/toolbox/uptime.c
@@ -29,71 +29,33 @@
  * SUCH DAMAGE.
  */
 
-#include <sys/time.h>
-#include <linux/ioctl.h>
-#include <linux/rtc.h>
-#include <linux/android_alarm.h>
-#include <fcntl.h>
+#include <errno.h>
 #include <stdio.h>
+#include <string.h>
 #include <time.h>
-#include <unistd.h>
 
 static void format_time(int time, char* buffer) {
-    int seconds, minutes, hours, days;
-
-    seconds = time % 60;
+    int seconds = time % 60;
     time /= 60;
-    minutes = time % 60;
+    int minutes = time % 60;
     time /= 60;
-    hours = time % 24;
-    days = time / 24;
+    int hours = time % 24;
+    int days = time / 24;
 
-    if (days > 0)
-        sprintf(buffer, "%d days, %02d:%02d:%02d", days, hours, minutes, seconds);
-    else
+    if (days > 0) {
+        sprintf(buffer, "%d day%s, %02d:%02d:%02d", days, (days == 1) ? "" : "s", hours, minutes, seconds);
+    } else {
         sprintf(buffer, "%02d:%02d:%02d", hours, minutes, seconds);
+    }
 }
 
-static int elapsedRealtimeAlarm(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);
-
-    return result;
-}
-
-int64_t elapsedRealtime()
-{
-    struct timespec ts;
-
-    int result = elapsedRealtimeAlarm(&ts);
-    if (result < 0)
-        result = clock_gettime(CLOCK_BOOTTIME, &ts);
-
-    if (result == 0)
-        return ts.tv_sec;
-    return -1;
-}
-
-int uptime_main(int argc __attribute__((unused)),
-        char *argv[] __attribute__((unused)))
-{
-    float up_time, idle_time;
-    char up_string[100], idle_string[100], sleep_string[100];
-    int elapsed;
-    struct timespec up_timespec;
-
+int uptime_main(int argc __attribute__((unused)), char *argv[] __attribute__((unused))) {
     FILE* file = fopen("/proc/uptime", "r");
     if (!file) {
         fprintf(stderr, "Could not open /proc/uptime\n");
         return -1;
     }
+    float idle_time;
     if (fscanf(file, "%*f %f", &idle_time) != 1) {
         fprintf(stderr, "Could not parse /proc/uptime\n");
         fclose(file);
@@ -101,18 +63,21 @@ int uptime_main(int argc __attribute__((unused)),
     }
     fclose(file);
 
-    if (clock_gettime(CLOCK_MONOTONIC, &up_timespec) < 0) {
-        fprintf(stderr, "Could not get monotonic time\n");
+    struct timespec up_timespec;
+    if (clock_gettime(CLOCK_MONOTONIC, &up_timespec) == -1) {
+        fprintf(stderr, "Could not get monotonic time: %s\n", strerror(errno));
 	return -1;
     }
-    up_time = up_timespec.tv_sec + up_timespec.tv_nsec / 1e9;
+    float up_time = up_timespec.tv_sec + up_timespec.tv_nsec / 1e9;
 
-    elapsed = elapsedRealtime();
-    if (elapsed < 0) {
-        fprintf(stderr, "elapsedRealtime failed\n");
+    struct timespec elapsed_timespec;
+    if (clock_gettime(CLOCK_BOOTTIME, &elapsed_timespec) == -1) {
+        fprintf(stderr, "Could not get boot time: %s\n", strerror(errno));
         return -1;
     }
+    int elapsed = elapsed_timespec.tv_sec;
 
+    char up_string[100], idle_string[100], sleep_string[100];
     format_time(elapsed, up_string);
     format_time((int)idle_time, idle_string);
     format_time((int)(elapsed - up_time), sleep_string);