id,summary,reporter,owner,description,type,status,milestone,component,version,severity,resolution,keywords,cc
4824,Boost file system function file_size() function is returning 0 for /proc virtual file system files.,pmanth2@…,Beman Dawes,"The tellg function of ifstream object  is returning -1 when the position of file pointer is queried for /proc virtual file system files. Below is the example program to demonstrate the problem

#include <iostream
#include <fstream>
using namespace std;

int main( int argc, char* argv[] ){
  long begin,end;
  ifstream myfile (argv[1]);
  begin = myfile.tellg();
  cout << "" begin "" << begin << endl;
  myfile.seekg (0, ios::end);
  end = myfile.tellg();
  myfile.close();
  cout << ""size is: "" << (end-begin) << "" bytes.\n"";
  return 0;
}

pmanth2@cyder:~$ ./fstream partA.cpp ( Normal text file )
 begin 0
size is: 6692 bytes.


pmanth2@cyder:~$ ./fstream /proc/cpuinfo  ( virtual file system file )
 begin 0
size is: -1 bytes.

The tellg() should return the file pointer location for /proc file system files also.
",Bugs,closed,To Be Determined,filesystem,Boost 1.44.0,Problem,worksforme,,