End of Life Ruby 3.0 has reached end of life and gets no more fixes. Switch to Ruby 4.0 →
class method
IO.for_fd
IO.for_fd(fd, mode [, opt]) → io
io.c
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static VALUE
rb_io_s_for_fd(int argc, VALUE *argv, VALUE klass)
{
VALUE io = rb_obj_alloc(klass);
rb_io_initialize(argc, argv, io);
return io;
}
Synonym for IO.new.