[Mingw-msys] Can't Detect EOF on STDIN, with Interactive Program in RXVT

[MARSHALL K. <Kei...@to...>]

Hi Guys,

I am having trouble with a program which reads from stdin,
and then does some processing of the data, stopping when
it reaches the end of the input stream.  When I compile the
program using MinGW, then run it in RXVT, I can't make it
break out of the processing loop.

The following trivial program illustrates the problem:

  #include <stdio.h>

  int main()
  {
    char buf[2];

    setvbuf( stdin, NULL, _IONBF, 0 );

    while( ! feof( stdin ) )
      fread( buf, 1, 1, stdin );

    printf( "done\n" );
    return( 0 );
  }

Using MinGW 3.0.0-1, in the MSYS 1.0.9 RXVT console,
if I call the above, say "mytest.c", and compile it with ...

  make mytest

then run it interactively, it simply hangs in the while loop; it
will echo any keys I type, but neither ^D nor ^Z seem to close
the stdin stream, to allow it to drop out of the loop.

If I run the MinGW compiled executable in CMD.EXE, instead of
RXVT, then ^Z breaks out of the loop, as expected.

If I run it in RXVT, but pipe its input from cat ...

  cat | mytest

then ^D makes cat close the pipe, and the loop in mytest breaks,
as expected.

If I run the MinGW executable in a Cygwin shell, then I observe
the same behaviour as in RXVT, but if I compile a Cygwin executable
from the same source, then ^D breaks the loop as expected, when
running mytest stand alone, in the Cygwin shell.

So ...

  Is this a bug in RXVT, or am I missing something?  I have tried
  searching the archives, but could find nothing relevant.

  MSYS' cat seems to handle ^D correctly; what does it do, that
  my code does not?

Regards,
Keith.