SysProcStat.cpp

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/*
 * SysProcStat.cpp
 *
 *  Created on: Jul 6, 2012
 *      Author: Ivan Valencik
 */

#include "RootCnv/SysProcStat.h"

#include <cstdio>
#include <sys/time.h>
using namespace Gaudi;

SysProcStat::SysProcStat() { update(); }

/*
 * Update system performance values from /proc/self/stat virtaul file.
 */
int SysProcStat::update()
{
  FILE* file = fopen( "/proc/self/stat", "r" );
  int   par  = fscanf( file, "%d %s %c %d %d"
                          "%d %d %d %lu %lu"
                          "%lu %lu %lu %lu %lu"
                          "%ld %ld %ld %ld %ld"
                          "%ld %lu %lu %ld %lu"
                          "%lu %lu %lu %lu %lu"
                          "%lu %lu %lu %lu %lu"
                          "%lu %lu %d %d",
                    &pid, comm, &state, &ppid, &pgrp, &session, &tty_nr, &tpgid, &flags, &minflt, &cminflt, &majflt,
                    &cmajflt, &utime, &stime, &cutime, &cstime, &priority, &nice, &num_threads, &itrealvalue, &startime,
                    &vsize, &rss, &rlim, &startcode, &endcode, &startstack, &kstkesp, &kstkeip, &signal, &blocked,
                    &sigingore, &sigcatch, &wchan, &nswap, &cnswap, &exit_signal, &processor );
  fclose( file );

  if ( par != 39 ) return -1;

  struct timeval tv;
  gettimeofday( &tv, nullptr );
  time = tv.tv_sec * 1000 + tv.tv_usec / 1000;

  return pid;
}