2 * Copyright (C) ARM Limited 2013-2014. All rights reserved.
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
12 #include <sys/socket.h>
15 #include <linux/netlink.h>
19 static const char EMPTY[] = "";
20 static const char ACTION[] = "ACTION=";
21 static const char DEVPATH[] = "DEVPATH=";
22 static const char SUBSYSTEM[] = "SUBSYSTEM=";
24 UEvent::UEvent() : mFd(-1) {
34 mFd = socket(PF_NETLINK, SOCK_RAW, NETLINK_KOBJECT_UEVENT);
36 logg->logMessage("%s(%s:%i): socket failed", __FUNCTION__, __FILE__, __LINE__);
40 struct sockaddr_nl sockaddr;
41 memset(&sockaddr, 0, sizeof(sockaddr));
42 sockaddr.nl_family = AF_NETLINK;
43 sockaddr.nl_groups = 1; // bitmask: (1 << 0) == kernel events, (1 << 1) == udev events
45 if (bind(mFd, (struct sockaddr *)&sockaddr, sizeof(sockaddr)) != 0) {
46 logg->logMessage("%s(%s:%i): bind failed", __FUNCTION__, __FILE__, __LINE__);
53 bool UEvent::read(UEventResult *const result) {
54 ssize_t bytes = recv(mFd, result->mBuf, sizeof(result->mBuf), 0);
56 logg->logMessage("%s(%s:%i): recv failed", __FUNCTION__, __FILE__, __LINE__);
60 result->mAction = EMPTY;
61 result->mDevPath = EMPTY;
62 result->mSubsystem = EMPTY;
64 for (int pos = 0; pos < bytes; pos += strlen(result->mBuf + pos) + 1) {
65 char *const str = result->mBuf + pos;
66 if (strncmp(str, ACTION, sizeof(ACTION) - 1) == 0) {
67 result->mAction = str + sizeof(ACTION) - 1;
68 } else if (strncmp(str, DEVPATH, sizeof(DEVPATH) - 1) == 0) {
69 result->mDevPath = str + sizeof(DEVPATH) - 1;
70 } else if (strncmp(str, SUBSYSTEM, sizeof(SUBSYSTEM) - 1) == 0) {
71 result->mSubsystem = str + sizeof(SUBSYSTEM) - 1;