auto import from //depot/cupcake/@135843
diff --git a/uevent/uevent.c b/uevent/uevent.c
new file mode 100644
index 0000000..d1d4b8e
--- /dev/null
+++ b/uevent/uevent.c
@@ -0,0 +1,78 @@
+/*
+ * Copyright (C) 2008 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <hardware_legacy/uevent.h>
+
+#include <string.h>
+#include <unistd.h>
+#include <poll.h>
+
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <linux/netlink.h>
+
+
+static int fd = -1;
+
+/* Returns 0 on failure, 1 on success */
+int uevent_init()
+{
+ struct sockaddr_nl addr;
+ int sz = 64*1024;
+ int s;
+
+ memset(&addr, 0, sizeof(addr));
+ addr.nl_family = AF_NETLINK;
+ addr.nl_pid = getpid();
+ addr.nl_groups = 0xffffffff;
+
+ s = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_KOBJECT_UEVENT);
+ if(s < 0)
+ return 0;
+
+ setsockopt(s, SOL_SOCKET, SO_RCVBUFFORCE, &sz, sizeof(sz));
+
+ if(bind(s, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
+ close(s);
+ return 0;
+ }
+
+ fd = s;
+ return (fd > 0);
+}
+
+int uevent_next_event(char* buffer, int buffer_length)
+{
+ while (1) {
+ struct pollfd fds;
+ int nr;
+
+ fds.fd = fd;
+ fds.events = POLLIN;
+ fds.revents = 0;
+ nr = poll(&fds, 1, -1);
+
+ if(nr > 0 && fds.revents == POLLIN) {
+ int count = recv(fd, buffer, buffer_length, 0);
+ if (count > 0) {
+ return count;
+ }
+ }
+ }
+
+ // won't get here
+ return 0;
+}
