instance method
ARGF#fileno
ARGF.fileno → integer
io.c
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static VALUE
argf_fileno(VALUE argf)
{
if (!next_argv()) {
rb_raise(rb_eArgError, "no stream");
}
ARGF_FORWARD(0, 0);
return rb_io_fileno(ARGF.current_file);
}
Returns an integer representing the numeric file descriptor for the current file. Raises an ArgumentError if there isn’t a current file.
Example
ARGF.fileno #=> 3