net: update docs and sync API for Plan 9
R=golang-dev, dave, mikioh.mikioh, bradfitz, rsc
CC=golang-dev
https://golang.org/cl/6674043
diff --git a/src/pkg/net/net.go b/src/pkg/net/net.go
index feb92a2..9af0514 100644
--- a/src/pkg/net/net.go
+++ b/src/pkg/net/net.go
@@ -44,6 +44,7 @@
import (
"errors"
+ "io"
"os"
"syscall"
"time"
@@ -363,3 +364,14 @@
func (e *DNSConfigError) Timeout() bool { return false }
func (e *DNSConfigError) Temporary() bool { return false }
+
+type writerOnly struct {
+ io.Writer
+}
+
+// Fallback implementation of io.ReaderFrom's ReadFrom, when sendfile isn't
+// applicable.
+func genericReadFrom(w io.Writer, r io.Reader) (n int64, err error) {
+ // Use wrapper to hide existing r.ReadFrom from io.Copy.
+ return io.Copy(writerOnly{w}, r)
+}
