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io: clarify that ReadAt shouldn't move the seek offset

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R=r, mkrautz, r2, rsc
CC=golang-dev
https://golang.org/cl/4415041
This commit is contained in:
Brad Fitzpatrick 2011-04-13 11:18:38 -07:00
parent a5ca635287
commit 0be2ef3fc4
1 changed files with 4 additions and 0 deletions
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4
src/pkg/io/io.go
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@ -136,6 +136,10 @@ type WriterTo interface {
// At the end of the input stream, ReadAt returns 0, os.EOF. // At the end of the input stream, ReadAt returns 0, os.EOF.
// ReadAt may return a non-zero number of bytes with a non-nil err. // ReadAt may return a non-zero number of bytes with a non-nil err.
// In particular, a ReadAt that exhausts the input may return n > 0, os.EOF. // In particular, a ReadAt that exhausts the input may return n > 0, os.EOF.
//
// If ReadAt is reading from an data stream with a seek offset,
// ReadAt should not affect nor be affected by the underlying
// seek offset.
type ReaderAt interface { type ReaderAt interface {
ReadAt(p []byte, off int64) (n int, err os.Error) ReadAt(p []byte, off int64) (n int, err os.Error)
} }