C++ fastcgi sample

counter.cpp

#include <iostream>
#include <fstream>
#include <fcgi_stdio.h>
#include <unistd.h>

int main( int argc , char * argv[] )
{
  int result;
  unsigned long long cnt = 0;
  const char* output = NULL;

  while((result = getopt(argc, (char**)argv, "o:")) != -1){
    switch(result){
    case 'o':
      if(optarg) output = optarg;
      break;
    }
  }

  if(output){
    // reading counter.
    std::ifstream fin( output, std::ios::in | std::ios::binary );
    if (fin){
      fin >> cnt;
    }
    fin.close();
  }


  while (FCGI_Accept () >= 0)
  {
    printf( "Content-Type: text/plain\n\n" );
    printf( "%d\n", ++cnt);
    if(output){
      // writing counter.
      std::ofstream fout;
      fout.open( output, std::ios::out | std::ios::binary | std::ios::trunc);
      if (fout) {
        fout << cnt;
      }
      fout.close();
    }
  }

  return 0;
}