debuggerd: Ignore SIGPIPE

The system server may prematurely close the connection to
/data/system/ndebugsocket if it's not interested in the data
from debuggerd.  If it does so, we don't want to die due to a
SIGPIPE.

Change-Id: Iaef1f497bcd630144e6df6a06644a3293b85b6e0

debuggerd/debuggerd.c

@@ -435,11 +435,13 @@ static int do_server() {
     signal(SIGBUS, SIG_DFL);
     signal(SIGFPE, SIG_DFL);
     signal(SIGSEGV, SIG_DFL);
-    signal(SIGPIPE, SIG_DFL);
 #ifdef SIGSTKFLT
     signal(SIGSTKFLT, SIG_DFL);
 #endif
 
+    // Ignore failed writes to closed sockets
+    signal(SIGPIPE, SIG_IGN);
+
     logsocket = socket_local_client("logd",
             ANDROID_SOCKET_NAMESPACE_ABSTRACT, SOCK_DGRAM);
     if(logsocket < 0) {