opening twice with O_RDWR

[Mike - EMAIL IGNORED]

On FC4 with g++ (GCC) 4.0.2 20051125 (Red Hat 4.0.2-8):

In the code fragment below, I would have expected a
failure on the second open, but I find this is not
the case.  I would like to generate a failure.  How
can I do this?  The file is usually, but not always
present before the program is run.

Thanks for your help.
Mike.

   const char* const      filePath = "a_file";

   int handle1 = ::open(filePath,O_RDWR|O_CREAT,0600);
   if (handle1 < 0)
      cerr << "fail1" << endl;

   int handle2 = ::open(filePath,O_RDWR|O_CREAT,0600);
   if (handle2 < 0)
      cerr << "fail2" << endl;





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