/**
* Get CPU stat of specified process.
*
* @param pid Process ID
* @return null may be returned if some unexpected things happens
*/
public static ProcCpuStat getProcCpuStat(int pid) {
String file = String.format(Locale.US, FILE_PROC_CPU_STAT, pid);
BufferedReader br = null;
try {
br = new BufferedReader(new FileReader(file));
String line = null;
while ((line = br.readLine()) != null) {
String[] fields = line.split("\\s+");
if (fields.length >= 15) {
ProcCpuStat stat = new ProcCpuStat(pid);
stat.utime = StringUtils.parseLong(fields[13], 0);
stat.stime = StringUtils.parseLong(fields[14], 0);
return stat;
}
}
} catch (IOException e) {
AppLogger.w(TAG, "failed to read proc cpu stat: " + pid, e);
} finally {
IoUtils.closeQuietly(br);
}
return null;
}
public static SysCpuStat getCpuStat() {
BufferedReader br = null;
try {
br = new BufferedReader(new FileReader(FILE_SYS_CPU_STAT));
String line = null;
while ((line = br.readLine()) != null) {
String[] fields = line.split("\\s+");
if (fields.length >= 5 && fields[0].equals("cpu")) {
SysCpuStat stat = new SysCpuStat();
stat.utime = StringUtils.parseLong(fields[1], 0);
stat.ntime = StringUtils.parseLong(fields[2], 0);
stat.stime = StringUtils.parseLong(fields[3], 0);
stat.itime = StringUtils.parseLong(fields[4], 0);
return stat;
}
}
} catch (IOException e) {
AppLogger.w(TAG, "failed to read sys cpu stat", e);
} finally {
IoUtils.closeQuietly(br);
}
return null;
}
