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net: don't return io.EOF from zero byte reads on Plan 9

Updates #15735.
Fixes #15741.

Change-Id: Ic4ad7e948e8c3ab5feffef89d7a37417f82722a1
Reviewed-on: https://go-review.googlesource.com/23199
Run-TryBot: Mikio Hara <mikioh.mikioh@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
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mikioh authored and bradfitz committed May 19, 2016
1 parent 5bcdd63 commit 8d428ed218d2b65dbb4abbd9be870c95439a2b14
Showing with 3 additions and 0 deletions.
  1. +3 −0 src/net/fd_plan9.go
@@ -76,6 +76,9 @@ func (fd *netFD) Read(b []byte) (n int, err error) {
return 0, err
}
defer fd.readUnlock()
if len(b) == 0 {
return 0, nil
}
n, err = fd.data.Read(b)
if isHangup(err) {
err = io.EOF

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