From eae4564cb7dea3ad9f5963814e82fd823267ff89 Mon Sep 17 00:00:00 2001
From: deadbeef <deadbeef@webrtc.org>
Date: Fri, 26 May 2017 16:27:09 -0700
Subject: [PATCH] Disable SIGPIPE for sockets created on iOS.

This can occur (and by default, terminates the process) for apps that
don't use the "voip" UIBackgroundMode.

We're already doing a similar thing on Linux (using MSG_NOSIGNAL for every
packet sent).

BUG=webrtc:7686

Review-Url: https://codereview.webrtc.org/2903313002
Cr-Commit-Position: refs/heads/master@{#18277}
---
 webrtc/base/physicalsocketserver.cc | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/webrtc/base/physicalsocketserver.cc b/webrtc/base/physicalsocketserver.cc
index a412703015..4ab33fb673 100644
--- a/webrtc/base/physicalsocketserver.cc
+++ b/webrtc/base/physicalsocketserver.cc
@@ -608,6 +608,15 @@ bool SocketDispatcher::Initialize() {
   ioctlsocket(s_, FIONBIO, &argp);
 #elif defined(WEBRTC_POSIX)
   fcntl(s_, F_SETFL, fcntl(s_, F_GETFL, 0) | O_NONBLOCK);
+#endif
+#if defined(WEBRTC_IOS)
+  // iOS may kill sockets when the app is moved to the background
+  // (specifically, if the app doesn't use the "voip" UIBackgroundMode). When
+  // we attempt to write to such a socket, SIGPIPE will be raised, which by
+  // default will terminate the process, which we don't want. By specifying
+  // this socket option, SIGPIPE will be disabled for the socket.
+  int value = 1;
+  ::setsockopt(s_, SOL_SOCKET, SO_NOSIGPIPE, &value, sizeof(value));
 #endif
   ss_->Add(this);
   return true;