Extract SIGPIPE ignoring code to a common place.

base/process_util_posix.cc

Index: base/process_util_posix.cc
diff --git a/base/process_util_posix.cc b/base/process_util_posix.cc
index a19cc2a999ecb5bc8b469778420afb1fb4b0f28b..9bc19e3676f6d1af5073f84c167fef787f6184bc 100644
--- a/base/process_util_posix.cc
+++ b/base/process_util_posix.cc
@@ -154,6 +154,15 @@ void ResetChildSignalHandlersToDefaults() {
 
 }  // anonymous namespace
 
+bool IgnoreSigPipe() {
+  struct sigaction action;
+  memset(&action, 0, sizeof(action));
+  action.sa_handler = SIG_IGN;
+  if (sigemptyset(&action.sa_mask) != 0)
+    return false;
+  return (sigaction(SIGPIPE, &action, NULL) == 0);
+}
+
 ProcessId GetCurrentProcId() {
   return getpid();
 }