popen/pclose: unexpected behavior

popen/pclose: unexpected behavior

[John O\'Leary]

Hello,

The following program hangs when its pipes are closed in the same order in 
which they were opened, and terminates when its pipes are closed in the 
reverse order. 

I've never seen this on other platforms - it a bug? Or is there a subtlety I'm 
unaware of?

Thanks
--John

----------------------------------------

#include <stdio.h>

int main (void) 
{
  FILE *pipe1;
  FILE *pipe2;

  pipe1 = popen ("cat", "w");
  pipe2 = popen ("cat", "w");

  /* hangs unless pipes are pclosed in order pipe2,pipe1 */
  pclose (pipe1);
  pclose (pipe2);

  return 0;
}



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