From f67f29903680e7a33af020dbeb80697ad619b26e Mon Sep 17 00:00:00 2001
From: Jeff Brown <jeffbrown@google.com>
Date: Thu, 16 Sep 2010 17:04:52 -0700
Subject: [PATCH] Ensure input dispatcher and native looper handles EINTR.

Change-Id: I0a42db5f273b9bfe4ab174e4ee65d5d852f9f6bc
---
 libs/ui/InputTransport.cpp | 11 +++++++++--
 libs/utils/Looper.cpp      | 14 ++++++++++----
 2 files changed, 19 insertions(+), 6 deletions(-)

diff --git a/libs/ui/InputTransport.cpp b/libs/ui/InputTransport.cpp
index 4c402dc02..2c6346ebe 100644
--- a/libs/ui/InputTransport.cpp
+++ b/libs/ui/InputTransport.cpp
@@ -131,7 +131,10 @@ status_t InputChannel::openInputChannelPair(const String8& name,
 }
 
 status_t InputChannel::sendSignal(char signal) {
-    ssize_t nWrite = ::write(mSendPipeFd, & signal, 1);
+    ssize_t nWrite;
+    do {
+        nWrite = ::write(mSendPipeFd, & signal, 1);
+    } while (nWrite == -1 && errno == EINTR);
 
     if (nWrite == 1) {
 #if DEBUG_CHANNEL_SIGNALS
@@ -147,7 +150,11 @@ status_t InputChannel::sendSignal(char signal) {
 }
 
 status_t InputChannel::receiveSignal(char* outSignal) {
-    ssize_t nRead = ::read(mReceivePipeFd, outSignal, 1);
+    ssize_t nRead;
+    do {
+        nRead = ::read(mReceivePipeFd, outSignal, 1);
+    } while (nRead == -1 && errno == EINTR);
+
     if (nRead == 1) {
 #if DEBUG_CHANNEL_SIGNALS
         LOGD("channel '%s' ~ received signal '%c'", mName.string(), *outSignal);
diff --git a/libs/utils/Looper.cpp b/libs/utils/Looper.cpp
index fd287da51..4aa50d675 100644
--- a/libs/utils/Looper.cpp
+++ b/libs/utils/Looper.cpp
@@ -162,9 +162,11 @@ int Looper::pollInner(int timeoutMillis) {
     struct epoll_event eventItems[EPOLL_MAX_EVENTS];
     int eventCount = epoll_wait(mEpollFd, eventItems, EPOLL_MAX_EVENTS, timeoutMillis);
     if (eventCount < 0) {
-        if (errno != EINTR) {
-            LOGW("Poll failed with an unexpected error, errno=%d", errno);
+        if (errno == EINTR) {
+            return ALOOPER_POLL_WAKE;
         }
+
+        LOGW("Poll failed with an unexpected error, errno=%d", errno);
         return ALOOPER_POLL_ERROR;
     }
 
@@ -196,7 +198,7 @@ int Looper::pollInner(int timeoutMillis) {
                     ssize_t nRead;
                     do {
                         nRead = read(mWakeReadPipeFd, buffer, sizeof(buffer));
-                    } while (nRead == sizeof(buffer));
+                    } while ((nRead == -1 && errno == EINTR) || nRead == sizeof(buffer));
                 } else {
                     LOGW("Ignoring unexpected epoll events 0x%x on wake read pipe.", epollEvents);
                 }
@@ -272,7 +274,11 @@ void Looper::wake() {
     LOGD("%p ~ wake", this);
 #endif
 
-    ssize_t nWrite = write(mWakeWritePipeFd, "W", 1);
+    ssize_t nWrite;
+    do {
+        nWrite = write(mWakeWritePipeFd, "W", 1);
+    } while (nWrite == -1 && errno == EINTR);
+
     if (nWrite != 1) {
         if (errno != EAGAIN) {
             LOGW("Could not write wake signal, errno=%d", errno);