From 62a30d2faa4ca2cd1050acbded30bbffd5bd0b19 Mon Sep 17 00:00:00 2001
From: Bhavna Sharma <sbhavna@codeaurora.org>
Date: Wed, 26 Aug 2015 11:26:46 -0700
Subject: [PATCH] Fix for timerfd_create on older kernel revisions

BOOTTIME_ALARM and BOOTTIME were added to timerfd_create
in kernel version 3.11 and 3.15 respectively.
But for targets still on older kernel version we fallback on MONOTONIC.

CRs-Fixed: 897805

Change-Id: I47d9780d69ce5ee8c183c84baa93ea3c1a00db57
---
 utils/LocTimer.cpp | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/utils/LocTimer.cpp b/utils/LocTimer.cpp
index 277a8135..524897bb 100644
--- a/utils/LocTimer.cpp
+++ b/utils/LocTimer.cpp
@@ -103,7 +103,7 @@ class LocTimerContainer : public LocHeap {
     // Poll task to provide epoll call and threading to poll.
     static LocTimerPollTask* mPollTask;
     // timer / alarm fd
-    const int mDevFd;
+    int mDevFd;
     // ctor
     LocTimerContainer(bool wakeOnExpire);
     // dtor
@@ -210,6 +210,13 @@ LocTimerPollTask* LocTimerContainer::mPollTask = NULL;
 // HwTimer (alarm), when wakeOnExpire is false.
 LocTimerContainer::LocTimerContainer(bool wakeOnExpire) :
     mDevFd(timerfd_create(wakeOnExpire ? CLOCK_BOOTTIME_ALARM : CLOCK_BOOTTIME, 0)) {
+
+    if ((-1 == mDevFd) && (errno == EINVAL)) {
+        LOC_LOGW("%s: timerfd_create failure, fallback to CLOCK_MONOTONIC - %s",
+            __FUNCTION__, strerror(errno));
+        mDevFd = timerfd_create(CLOCK_MONOTONIC, 0);
+    }
+
     if (-1 != mDevFd) {
         // ensure we have the necessary resources created
         LocTimerContainer::getPollTaskLocked();