procUtils.cc

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    /*
 * Displays linux /proc/pid/stat in human-readable format
 *
 * Build: gcc -o procstat procstat.c
 * Usage: procstat pid
 *        cat /proc/pid/stat | procstat
 *
 * Homepage: http://www.brokestream.com/procstat.html
 * Version : 2009-03-05
 *
 * Ivan Tikhonov, http://www.brokestream.com, kefeer@netangels.ru
 *
 * 2007-09-19 changed HZ=100 error to warning
 *
 * 2009-03-05 tickspersec are taken from sysconf (Sabuj Pattanayek)
 *
 */


/* Copyright (C) 2009 Ivan Tikhonov

  This software is provided 'as-is', without any express or implied
  warranty.  In no event will the authors be held liable for any damages
  arising from the use of this software.

  Permission is granted to anyone to use this software for any purpose,
  including commercial applications, and to alter it and redistribute it
  freely, subject to the following restrictions:

  1. The origin of this software must not be misrepresented; you must not
     claim that you wrote the original software. If you use this software
     in a product, an acknowledgment in the product documentation would be
     appreciated but is not required.
  2. Altered source versions must be plainly marked as such, and must not be
     misrepresented as being the original software.
  3. This notice may not be removed or altered from any source distribution.

  Ivan Tikhonov, kefeer@brokestream.com

*/


#define FSHIFT          16              /* nr of bits of precision */
#define FIXED_1         (1<<FSHIFT)     /* 1.0 as fixed-point */
#define LOAD_INT(x) ((x) >> FSHIFT)
#define LOAD_FRAC(x) LOAD_INT(((x) & (FIXED_1-1)) * 100)

#ifdef linux
#include <sys/sysinfo.h>
#endif
#include <errno.h>
#include <iostream>
#include <iomanip>

#include <stdio.h>
#include <unistd.h>
#include <time.h>
#ifdef linux
#include <linux/limits.h>
#endif
#include <sys/times.h>
#include <sstream>
#include "procUtils.h"

namespace evf{
  namespace utils{
    



    typedef long long int num;

    num pid;
    char tcomm[PATH_MAX];
    char state;
    
    num ppid;
    num pgid;
    num sid;
    num tty_nr;
    num tty_pgrp;
    
    num flags;
    num min_flt;
    num cmin_flt;
    num maj_flt;
    num cmaj_flt;
    num utime;
    num stimev;
    
    num cutime;
    num cstime;
    num priority;
    num nicev;
    num num_threads;
    num it_real_value;
    
    unsigned long long start_time;
    
    num vsize;
    num rss;
    num rsslim;
    num start_code;
    num end_code;
    num start_stack;
    num esp;
    num eip;
    
    num pending;
    num blocked;
    num sigign;
    num sigcatch;
    num wchan;
    num zero1;
    num zero2;
    num exit_signal;
    num cpu;
    num rt_priority;
    num policy;
    
    long tickspersec;
    char obuf[4096];
    FILE *input;

    void readone(num *x) { fscanf(input, "%lld ", x); }
    void readunsigned(unsigned long long *x) { fscanf(input, "%llu ", x); }
    void readstr(char *x) {  fscanf(input, "%s ", x);}
    void readchar(char *x) {  fscanf(input, "%c ", x);}
    
    void printone(const char *name, num x) {  sprintf(obuf,"%20s: %lld\n", name, x);}
    void printonex(const char *name, num x) {  sprintf(obuf,"%20s: %016llx\n", name, x);}
    void printunsigned(const char *name, unsigned long long x) {  sprintf(obuf,"%20s: %llu\n", name, x);}
    void printchar(const char *name, char x) {  sprintf(obuf,"%20s: %c\n", name, x);}
    void printstr(const char *name, char *x) {  sprintf(obuf,"%20s: %s\n", name, x);}
    void printtime(const char *name, num x) {  sprintf(obuf,"%20s: %f\n", name, (((double)x) / tickspersec));}
    
    int gettimesinceboot() {
      FILE *procuptime;
      int sec, ssec;
      
      procuptime = fopen("/proc/uptime", "r");
      fscanf(procuptime, "%d.%ds", &sec, &ssec);
      fclose(procuptime);
      return (sec*tickspersec)+ssec;
    }

    void printtimediff(const char *name, num x) {
      int sinceboot = gettimesinceboot();
      int running = sinceboot - x;
      time_t rt = time(NULL) - (running / tickspersec);
      char buf[1024];
      
      strftime(buf, sizeof(buf), "%m.%d %H:%M", localtime(&rt));
      sprintf(obuf,"%20s: %s (%lu.%lus)\n", name, buf, running / tickspersec, running % tickspersec);
    }
    
    void procStat(std::ostringstream *out) {
      tickspersec = sysconf(_SC_CLK_TCK);
      input = NULL;
      
      std::ostringstream ost; 
      ost << "/proc/" << getpid() << "/stat";
      input = fopen(ost.str().c_str(), "r");
      

      readone(&pid);
      readstr(tcomm);
      readchar(&state);
      readone(&ppid);
      readone(&pgid);
      readone(&sid);
      readone(&tty_nr);
      readone(&tty_pgrp);
      readone(&flags);
      readone(&min_flt);
      readone(&cmin_flt);
      readone(&maj_flt);
      readone(&cmaj_flt);
      readone(&utime);
      readone(&stimev);
      readone(&cutime);
      readone(&cstime);
      readone(&priority);
      readone(&nicev);
      readone(&num_threads);
      readone(&it_real_value);
      readunsigned(&start_time);
      readone(&vsize);
      readone(&rss);
      readone(&rsslim);
      readone(&start_code);
      readone(&end_code);
      readone(&start_stack);
      readone(&esp);
      readone(&eip);
      readone(&pending);
      readone(&blocked);
      readone(&sigign);
      readone(&sigcatch);
      readone(&wchan);
      readone(&zero1);
      readone(&zero2);
      readone(&exit_signal);
      readone(&cpu);
      readone(&rt_priority);
      readone(&policy);
      
      {
    printone("pid", pid); *out << obuf;
    printstr("tcomm", tcomm); *out << obuf;
    printchar("state", state); *out << obuf;
    printone("ppid", ppid); *out << obuf;
    printone("pgid", pgid); *out << obuf;
    printone("sid", sid); *out << obuf;
    printone("tty_nr", tty_nr); *out << obuf;
    printone("tty_pgrp", tty_pgrp); *out << obuf;
    printone("flags", flags); *out << obuf;
    printone("min_flt", min_flt); *out << obuf;
    printone("cmin_flt", cmin_flt); *out << obuf;
    printone("maj_flt", maj_flt); *out << obuf;
    printone("cmaj_flt", cmaj_flt); *out << obuf;
    printtime("utime", utime); *out << obuf;
    printtime("stime", stimev); *out << obuf;
    printtime("cutime", cutime); *out << obuf;
    printtime("cstime", cstime); *out << obuf;
    printone("priority", priority); *out << obuf;
    printone("nice", nicev); *out << obuf;
    printone("num_threads", num_threads); *out << obuf;
    printtime("it_real_value", it_real_value); *out << obuf;
    printtimediff("start_time", start_time); *out << obuf;
    printone("vsize", vsize); *out << obuf;
    printone("rss", rss); *out << obuf;
    printone("rsslim", rsslim); *out << obuf;
    printone("start_code", start_code); *out << obuf;
    printone("end_code", end_code); *out << obuf;
    printone("start_stack", start_stack); *out << obuf;
    printone("esp", esp); *out << obuf;
    printone("eip", eip); *out << obuf;
    printonex("pending", pending); *out << obuf;
    printonex("blocked", blocked); *out << obuf;
    printonex("sigign", sigign); *out << obuf;
    printonex("sigcatch", sigcatch); *out << obuf;
    printone("wchan", wchan); *out << obuf;
    printone("zero1", zero1); *out << obuf;
    printone("zero2", zero2); *out << obuf;
    printonex("exit_signal", exit_signal); *out << obuf;
    printone("cpu", cpu); *out << obuf;
    printone("rt_priority", rt_priority); *out << obuf;
    printone("policy", policy); *out << obuf;
      }
      fclose(input);
    }





    //Derived from:
    /* vi: set sw=4 ts=4: */
    /*
     * Mini uptime implementation for busybox
     *
     * Copyright (C) 1999,2000 by Lineo, inc.
     * Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>
     *
     * This program is free software; you can redistribute it and/or modify
     * it under the terms of the GNU General Public License as published by
     * the Free Software Foundation; either version 2 of the License, or
     * (at your option) any later version.
     *
     * This program is distributed in the hope that it will be useful,
     * but WITHOUT ANY WARRANTY; without even the implied warranty of
     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
     * General Public License for more details.
     *
     * You should have received a copy of the GNU General Public License
     * along with this program; if not, write to the Free Software
     * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
     *
     */

    /* This version of uptime doesn't display the number of users on the system,
     * since busybox init doesn't mess with utmp.  For folks using utmp that are
     * just dying to have # of users reported, feel free to write it as some type
     * of BB_FEATURE_UMTP_SUPPORT #define
     */



    void uptime(std::ostringstream *out)
    {
#ifdef linux
      int updays, uphours, upminutes;
      struct sysinfo info;
      struct tm *current_time;
      time_t current_secs;

      time(&current_secs);
      current_time = localtime(&current_secs);

      sysinfo(&info);

      *out << std::setw(2) 
       << (current_time->tm_hour%12 ? current_time->tm_hour%12 : 12)
       << ":"
       << current_time->tm_min
       << (current_time->tm_hour > 11 ? " pm, " : " am, ")
       << " up ";
      updays = (int) info.uptime / (60*60*24);
      if (updays)
    *out <<  updays << " day" << ((updays != 1) ? "s " : " ");
      upminutes = (int) info.uptime / 60;
      uphours = (upminutes / 60) % 24;
      upminutes %= 60;
      if(uphours)
    *out << std::setw(2) << uphours << ":" << upminutes;
      else
    *out << upminutes << " minutes ";
      
      *out << " - load average "
       << LOAD_INT(info.loads[0]) << " " 
       << LOAD_FRAC(info.loads[0]) << " " 
       << LOAD_INT(info.loads[1]) << " " 
       << LOAD_FRAC(info.loads[1]) << " " 
       << LOAD_INT(info.loads[2]) << " " 
       << LOAD_FRAC(info.loads[2]) << " ";
      *out << " used memory " << std::setw(3) 
       << (float(info.totalram-info.freeram)/float(info.totalram))*100 << "%";
#else
      // FIXME: one could probably use `clock_get_uptime` and similar on 
      // macosx to obtain at least part of the information.
      *out << "Unable to retrieve uptime information on this platform.";
#endif
    }
    void mDiv(std::ostringstream *out, std::string name){
      *out << "<div id=\"" << name << "\">";
    }
    void cDiv(std::ostringstream *out){
      *out << "</div>";
    } 
    void mDiv(std::ostringstream *out, std::string name, std::string value){
      mDiv(out,name);
      *out << value;
      cDiv(out);
    }
    void mDiv(std::ostringstream *out, std::string name, unsigned int value){
      mDiv(out,name);
      *out << value;
      cDiv(out);
    } 
  } // namespace utils
} //namespace evf