ext/raindrops/my_fileno.h

   1 #include <ruby.h>
   2 #ifdef HAVE_RUBY_IO_H
   3 #  include <ruby/io.h>
   4 #else
   5 #  include <stdio.h>
   6 #  include <rubyio.h>
   7 #endif
   8
   9 #if ! HAVE_RB_IO_T
  10 #  define rb_io_t OpenFile
  11 #endif
  12
  13 #ifdef GetReadFile
  14 #  define FPTR_TO_FD(fptr) (fileno(GetReadFile(fptr)))
  15 #else
  16 #  if !HAVE_RB_IO_T || (RUBY_VERSION_MAJOR == 1 && RUBY_VERSION_MINOR == 8)
  17 #    define FPTR_TO_FD(fptr) fileno(fptr->f)
  18 #  else
  19 #    define FPTR_TO_FD(fptr) fptr->fd
  20 #  endif
  21 #endif
  22
  23 static int my_fileno(VALUE io)
  24 {
  25         rb_io_t *fptr;
  26         int fd;
  27
  28         if (TYPE(io) != T_FILE)
  29                 io = rb_convert_type(io, T_FILE, "IO", "to_io");
  30         GetOpenFile(io, fptr);
  31         fd = FPTR_TO_FD(fptr);
  32
  33         if (fd < 0)
  34                 rb_raise(rb_eIOError, "closed stream");
  35         return fd;
  36 }