From 581edc1b6c3799238cfb674dfddb97db44f2818e Mon Sep 17 00:00:00 2001
From: Mark Salyzyn <salyzyn@google.com>
Date: Wed, 20 Nov 2013 13:38:52 -0800
Subject: [PATCH] set /proc/sys/net/unix/max_dgram_qlen to large value

- init: set /proc/sys/net/unix/max_dgram_qlen to 300
- libsysutils: Add listen backlog argument to startListener
- logd: set listen backlog to 300

Change-Id: Id6d37d6c937ba2d221e76258d89c9516619caeec
---
 include/sysutils/SocketListener.h  | 1 +
 libsysutils/src/SocketListener.cpp | 6 +++++-
 logd/main.cpp                      | 3 ++-
 rootdir/init.rc                    | 1 +
 4 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/include/sysutils/SocketListener.h b/include/sysutils/SocketListener.h
index c204a0fc3..bc93b8635 100644
--- a/include/sysutils/SocketListener.h
+++ b/include/sysutils/SocketListener.h
@@ -38,6 +38,7 @@ public:
 
     virtual ~SocketListener();
     int startListener();
+    int startListener(int backlog);
     int stopListener();
 
     void sendBroadcast(int code, const char *msg, bool addErrno);
diff --git a/libsysutils/src/SocketListener.cpp b/libsysutils/src/SocketListener.cpp
index 5c752066c..527a6a0a3 100644
--- a/libsysutils/src/SocketListener.cpp
+++ b/libsysutils/src/SocketListener.cpp
@@ -70,6 +70,10 @@ SocketListener::~SocketListener() {
 }
 
 int SocketListener::startListener() {
+    return startListener(4);
+}
+
+int SocketListener::startListener(int backlog) {
 
     if (!mSocketName && mSock == -1) {
         SLOGE("Failed to start unbound listener");
@@ -84,7 +88,7 @@ int SocketListener::startListener() {
         SLOGV("got mSock = %d for %s", mSock, mSocketName);
     }
 
-    if (mListen && listen(mSock, 4) < 0) {
+    if (mListen && listen(mSock, backlog) < 0) {
         SLOGE("Unable to listen on socket (%s)", strerror(errno));
         return -1;
     } else if (!mListen)
diff --git a/logd/main.cpp b/logd/main.cpp
index 18912060f..6216b95c3 100644
--- a/logd/main.cpp
+++ b/logd/main.cpp
@@ -105,7 +105,8 @@ int main() {
     // and LogReader is notified to send updates to connected clients.
 
     LogListener *swl = new LogListener(logBuf, reader);
-    if (swl->startListener()) {
+    // Backlog and /proc/sys/net/unix/max_dgram_qlen set to large value
+    if (swl->startListener(300)) {
         exit(1);
     }
 
diff --git a/rootdir/init.rc b/rootdir/init.rc
index 9975368c2..ffbc9fa61 100644
--- a/rootdir/init.rc
+++ b/rootdir/init.rc
@@ -100,6 +100,7 @@ loglevel 3
     write /proc/sys/kernel/dmesg_restrict 1
     write /proc/sys/vm/mmap_min_addr 32768
     write /proc/sys/net/ipv4/ping_group_range "0 2147483647"
+    write /proc/sys/net/unix/max_dgram_qlen 300
     write /proc/sys/kernel/sched_rt_runtime_us 950000
     write /proc/sys/kernel/sched_rt_period_us 1000000