End of Life Ruby 3.2 has reached end of life and gets no more fixes. Switch to Ruby 4.0 →

instance method

IO#binmode?

binmode? → true or false

static VALUE
rb_io_binmode_p(VALUE io)
{
    rb_io_t *fptr;
    GetOpenFile(io, fptr);
    return RBOOL(fptr->mode & FMODE_BINMODE);
}

Returns true if the stream is on binary mode, false otherwise. See Data Mode.

See also #binmode #check_winsize_changed #beep #clear_screen also in 4.1 · 4.0 · 3.4 · 3.3 · 3.1 · 3.0