IO#sysread should raise IOError when closed
MODIFY
src/io.c
src/io.c
@@ -636,7 +636,7 @@ mrb_io_sysread(mrb_state *mrb, mrb_value io)
buf = mrb_str_resize(mrb, buf, maxlen);
}
- fptr = (struct mrb_io *)mrb_get_datatype(mrb, io, &mrb_io_type);
+ fptr = (struct mrb_io *)io_get_open_fptr(mrb, io);
ret = read(fptr->fd, RSTRING_PTR(buf), maxlen);
switch (ret) {
case 0: /* EOF */

MODIFY
test/io.rb
test/io.rb
@@ -235,6 +235,7 @@ assert('IO.sysopen, IO#sysread') do
end
io.close
assert_equal "", io.sysread(0)
+ assert_raise(IOError) { io.sysread(1) }
io.closed?
end

IO#sysread should raise IOError when closed