auto import from //depot/cupcake/@135843
diff --git a/linker/debugger.c b/linker/debugger.c
new file mode 100644
index 0000000..5bb065c
--- /dev/null
+++ b/linker/debugger.c
@@ -0,0 +1,81 @@
+/*
+ * Copyright (C) 2008 The Android Open Source Project
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <ctype.h>
+#include <signal.h>
+#include <sys/mman.h>
+
+#include "linker.h"
+
+#include <sys/socket.h>
+#include <cutils/sockets.h>
+
+void notify_gdb_of_libraries();
+
+void debugger_signal_handler(int n)
+{
+ unsigned tid;
+ int s;
+
+ /* avoid picking up GC interrupts */
+ signal(SIGUSR1, SIG_IGN);
+
+ tid = gettid();
+ s = socket_local_client("android:debuggerd",
+ ANDROID_SOCKET_NAMESPACE_ABSTRACT, SOCK_STREAM);
+
+ if(s >= 0) {
+ /* debugger knows our pid from the credentials on the
+ * local socket but we need to tell it our tid. It
+ * is paranoid and will verify that we are giving a tid
+ * that's actually in our process
+ */
+ write(s, &tid, sizeof(unsigned));
+
+ read(s, &tid, 1);
+ notify_gdb_of_libraries();
+ close(s);
+ }
+
+ /* remove our net so we fault for real when we return */
+ signal(n, SIG_IGN);
+}
+
+void debugger_init()
+{
+ signal(SIGILL, debugger_signal_handler);
+ signal(SIGABRT, debugger_signal_handler);
+ signal(SIGBUS, debugger_signal_handler);
+ signal(SIGFPE, debugger_signal_handler);
+ signal(SIGSEGV, debugger_signal_handler);
+ signal(SIGSTKFLT, debugger_signal_handler);
+ signal(SIGPIPE, debugger_signal_handler);
+}