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.
11 #include <linux/netlink.h>
13 #include <sys/socket.h>
18 static const char EMPTY[] = "";
19 static const char ACTION[] = "ACTION=";
20 static const char DEVPATH[] = "DEVPATH=";
21 static const char SUBSYSTEM[] = "SUBSYSTEM=";
23 UEvent::UEvent() : mFd(-1) {
33 mFd = socket(PF_NETLINK, SOCK_RAW, NETLINK_KOBJECT_UEVENT);
35 logg->logMessage("%s(%s:%i): socket failed", __FUNCTION__, __FILE__, __LINE__);
39 struct sockaddr_nl sockaddr;
40 memset(&sockaddr, 0, sizeof(sockaddr));
41 sockaddr.nl_family = AF_NETLINK;
42 sockaddr.nl_groups = 1; // bitmask: (1 << 0) == kernel events, (1 << 1) == udev events
44 if (bind(mFd, (struct sockaddr *)&sockaddr, sizeof(sockaddr)) != 0) {
45 logg->logMessage("%s(%s:%i): bind failed", __FUNCTION__, __FILE__, __LINE__);
52 bool UEvent::read(UEventResult *const result) {
53 ssize_t bytes = recv(mFd, result->mBuf, sizeof(result->mBuf), 0);
55 logg->logMessage("%s(%s:%i): recv failed", __FUNCTION__, __FILE__, __LINE__);
59 result->mAction = EMPTY;
60 result->mDevPath = EMPTY;
61 result->mSubsystem = EMPTY;
63 for (int pos = 0; pos < bytes; pos += strlen(result->mBuf + pos) + 1) {
64 char *const str = result->mBuf + pos;
65 if (strncmp(str, ACTION, sizeof(ACTION) - 1) == 0) {
66 result->mAction = str + sizeof(ACTION) - 1;
67 } else if (strncmp(str, DEVPATH, sizeof(DEVPATH) - 1) == 0) {
68 result->mDevPath = str + sizeof(DEVPATH) - 1;
69 } else if (strncmp(str, SUBSYSTEM, sizeof(SUBSYSTEM) - 1) == 0) {
70 result->mSubsystem = str + sizeof(SUBSYSTEM) - 1;