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io: clarify Reader returning 0, nil

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Fixes #8317.

LGTM=bradfitz
R=bradfitz, iant, r
CC=golang-codereviews
https://golang.org/cl/143100043
This commit is contained in:
Russ Cox 2014-09-16 10:01:28 -04:00
parent 337fe4134f
commit 3d2321f639
1 changed files with 5 additions and 2 deletions
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7
src/io/io.go
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@ -62,8 +62,11 @@ var ErrNoProgress = errors.New("multiple Read calls return no data or error")
// allowed EOF behaviors.
//
// Implementations of Read are discouraged from returning a
// zero byte count with a nil error, and callers should treat
// that situation as a no-op. Implementations must not retain p.
// zero byte count with a nil error, except when len(p) == 0.
// Callers should treat a return of 0 and nil as indicating that
// nothing happened; in particular it does not indicate EOF.
//
// Implementations must not retain p.
type Reader interface {
Read(p []byte) (n int, err error)
}