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;
}