From 6f96a93a9bbd46bce0e6ec32d8bd210c8a14b3d6 Mon Sep 17 00:00:00 2001
From: Nanang Izzuddin <nanang@teluu.com>
Date: Thu, 6 Oct 2016 04:05:02 +0000
Subject: [PATCH] Fix #1961: Updated Android timestamp to use CLOCK_BOOTTIME
 (or ANDROID_ALARM_ELAPSED_REALTIME for older NDK version), to avoid suspended
 clock when CPU is in deep sleep.

git-svn-id: https://svn.pjsip.org/repos/pjproject/trunk@5447 74dad513-b988-da41-8d7b-12977e46ad98
---
 pjlib/src/pj/os_timestamp_posix.c | 56 +++++++++++++++++++++++++++++++
 1 file changed, 56 insertions(+)

diff --git a/pjlib/src/pj/os_timestamp_posix.c b/pjlib/src/pj/os_timestamp_posix.c
index 288051508..d0b08089a 100644
--- a/pjlib/src/pj/os_timestamp_posix.c
+++ b/pjlib/src/pj/os_timestamp_posix.c
@@ -160,6 +160,62 @@ PJ_DEF(pj_status_t) pj_get_timestamp_freq(pj_timestamp *freq)
     return PJ_SUCCESS;
 }
 
+#elif defined(__ANDROID__)
+#include <errno.h>
+#include <time.h>
+
+#if !defined(CLOCK_BOOTTIME)
+#  include <linux/android_alarm.h>
+#  include <fcntl.h>
+#endif
+
+#define NSEC_PER_SEC	1000000000
+
+PJ_DEF(pj_status_t) pj_get_timestamp(pj_timestamp *ts)
+{
+    struct timespec tp;
+
+#if defined(CLOCK_BOOTTIME)
+    /* Use CLOCK_BOOTTIME if supported */
+    if (clock_gettime(CLOCK_BOOTTIME, &tp) != 0) {
+	return PJ_RETURN_OS_ERROR(pj_get_native_os_error());
+    }
+#else
+    /* For older NDK version, use ANDROID_ALARM_ELAPSED_REALTIME */
+    static int s_fd = -1;
+
+    if (s_fd == -1) {
+        int fd = open("/dev/alarm", O_RDONLY);
+        if (fd >= 0) {
+	    s_fd = fd;
+            //close(fd);
+        } else {
+	    return PJ_RETURN_OS_ERROR(pj_get_native_os_error());		
+	}
+    }
+    int err = ioctl(s_fd,
+            ANDROID_ALARM_GET_TIME(ANDROID_ALARM_ELAPSED_REALTIME), &tp);
+
+    if (err != 0) {
+	return PJ_RETURN_OS_ERROR(pj_get_native_os_error());
+    }
+#endif
+
+    ts->u64 = tp.tv_sec;
+    ts->u64 *= NSEC_PER_SEC;
+    ts->u64 += tp.tv_nsec;
+
+    return PJ_SUCCESS;
+}
+
+PJ_DEF(pj_status_t) pj_get_timestamp_freq(pj_timestamp *freq)
+{
+    freq->u32.hi = 0;
+    freq->u32.lo = NSEC_PER_SEC;
+
+    return PJ_SUCCESS;
+}
+
 #elif defined(USE_POSIX_TIMERS) && USE_POSIX_TIMERS != 0
 #include <sys/time.h>
 #include <time.h>