[Bug #684](Closed) io.read(nil, buf) $B$G(B buf $B$,JQ99$5$l$J$$(B

[Usaku_NAKAMURA]

e$B%A%1%C%He(B #684 e$B$,99?7$5$l$^$7$?!#e(B (by Usaku NAKAMURA)

e$B%9%F!<%?%9e(B Opene$B$+$ie(BClosede$B$KJQ99e(B
e$BC4Ev<Te(B Nobuyoshi N.e$B$K%;%C%He(B

r19943

http://redmine.ruby-lang.org/issues/show/684