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/**
* Copyright (C) ARM Limited 2013-2016. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include "UEvent.h"
#include <string.h>
#include <sys/socket.h>
#include <unistd.h>
#include <linux/netlink.h>
#include "Logging.h"
#include "OlySocket.h"
static const char EMPTY[] = "";
static const char ACTION[] = "ACTION=";
static const char DEVPATH[] = "DEVPATH=";
static const char SUBSYSTEM[] = "SUBSYSTEM=";
UEvent::UEvent() : mFd(-1) {
}
UEvent::~UEvent() {
if (mFd >= 0) {
close(mFd);
}
}
bool UEvent::init() {
mFd = socket_cloexec(PF_NETLINK, SOCK_RAW, NETLINK_KOBJECT_UEVENT);
if (mFd < 0) {
logg.logMessage("socket failed");
return false;
}
struct sockaddr_nl sockaddr;
memset(&sockaddr, 0, sizeof(sockaddr));
sockaddr.nl_family = AF_NETLINK;
sockaddr.nl_groups = 1; // bitmask: (1 << 0) == kernel events, (1 << 1) == udev events
sockaddr.nl_pid = 0;
if (bind(mFd, (struct sockaddr *)&sockaddr, sizeof(sockaddr)) != 0) {
logg.logMessage("bind failed");
return false;
}
return true;
}
bool UEvent::read(UEventResult *const result) {
ssize_t bytes = recv(mFd, result->mBuf, sizeof(result->mBuf), 0);
if (bytes <= 0) {
logg.logMessage("recv failed");
return false;
}
result->mAction = EMPTY;
result->mDevPath = EMPTY;
result->mSubsystem = EMPTY;
for (int pos = 0; pos < bytes; pos += strlen(result->mBuf + pos) + 1) {
char *const str = result->mBuf + pos;
logg.logMessage("uevent + %i: %s", pos, str);
if (strncmp(str, ACTION, sizeof(ACTION) - 1) == 0) {
result->mAction = str + sizeof(ACTION) - 1;
} else if (strncmp(str, DEVPATH, sizeof(DEVPATH) - 1) == 0) {
result->mDevPath = str + sizeof(DEVPATH) - 1;
} else if (strncmp(str, SUBSYSTEM, sizeof(SUBSYSTEM) - 1) == 0) {
result->mSubsystem = str + sizeof(SUBSYSTEM) - 1;
}
}
return true;
}
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