SysProcStat.cpp

Go to the documentation of this file.

/***********************************************************************************\
* (c) Copyright 1998-2024 CERN for the benefit of the LHCb and ATLAS collaborations *
*                                                                                   *
* This software is distributed under the terms of the Apache version 2 licence,     *
* copied verbatim in the file "LICENSE".                                            *
*                                                                                   *
* In applying this licence, CERN does not waive the privileges and immunities       *
* granted to it by virtue of its status as an Intergovernmental Organization        *
* or submit itself to any jurisdiction.                                             *
\***********************************************************************************/
/*
 * 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 %127s %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;
}