1 files changed, 53 insertions, 0 deletions
diff --git a/src/net/sendfile_linux.go b/src/net/sendfile_linux.go
new file mode 100644
index 0000000..e5150aa
--- /dev/null
+++ b/src/net/sendfile_linux.go
@@ -0,0 +1,53 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package net
+
+import (
+	"internal/poll"
+	"io"
+	"os"
+)
+
+// sendFile copies the contents of r to c using the sendfile
+// system call to minimize copies.
+//
+// if handled == true, sendFile returns the number of bytes copied and any
+// non-EOF error.
+//
+// if handled == false, sendFile performed no work.
+func sendFile(c *netFD, r io.Reader) (written int64, err error, handled bool) {
+	var remain int64 = 1 << 62 // by default, copy until EOF
+
+	lr, ok := r.(*io.LimitedReader)
+	if ok {
+		remain, r = lr.N, lr.R
+		if remain <= 0 {
+			return 0, nil, true
+		}
+	}
+	f, ok := r.(*os.File)
+	if !ok {
+		return 0, nil, false
+	}
+
+	sc, err := f.SyscallConn()
+	if err != nil {
+		return 0, nil, false
+	}
+
+	var werr error
+	err = sc.Read(func(fd uintptr) bool {
+		written, werr = poll.SendFile(&c.pfd, int(fd), remain)
+		return true
+	})
+	if err == nil {
+		err = werr
+	}
+
+	if lr != nil {
+		lr.N = remain - written
+	}
+	return written, wrapSyscallError("sendfile", err), written > 0
+}