diff options
Diffstat (limited to 'src/io/io.go')
| -rw-r--r-- | src/io/io.go | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/src/io/io.go b/src/io/io.go index e8bbad537..7507a8492 100644 --- a/src/io/io.go +++ b/src/io/io.go @@ -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) } |