text: // Check that we can operate on files from /dev/fd.
  // REQUIRES: dev-fd-fs
  
  // Check reading from named pipes. We cat the input here instead of redirecting
  // it to ensure that /dev/fd/0 is a named pipe, not just a redirected file.
  //
  // RUN: cat %s | %clang -x c /dev/fd/0 -E > %t
  // RUN: FileCheck --check-prefix DEV-FD-INPUT < %t %s
  //
  // DEV-FD-INPUT: int x;
  
  
  // Check writing to /dev/fd named pipes. We use cat here as before to ensure we
  // get a named pipe.
  //
  // RUN: %clang -x c %s -E -o /dev/fd/1 | cat > %t
  // RUN: FileCheck --check-prefix DEV-FD-FIFO-OUTPUT < %t %s
  //
  // DEV-FD-FIFO-OUTPUT: int x;
  
  
  // Check writing to /dev/fd regular files.
  //
  // RUN: %clang -x c %s -E -o /dev/fd/1 > %t
  // RUN: FileCheck --check-prefix DEV-FD-REG-OUTPUT < %t %s
  //
  // DEV-FD-REG-OUTPUT: int x;
  
  int x;
  