Method: IO#fileno

Defined in:
io.c

#fileno ⇒ Integer #to_i ⇒ Integer Also known as: to_i

Returns an integer representing the numeric file descriptor for ios.

$stdin.fileno    #=> 0
$stdout.fileno   #=> 1

Overloads:


2468
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# File 'io.c', line 2468

static VALUE
rb_io_fileno(VALUE io)
{
    rb_io_t *fptr = RFILE(io)->fptr;
    int fd;

    rb_io_check_closed(fptr);
    fd = fptr->fd;
    return INT2FIX(fd);
}