1 files changed, 84 insertions, 0 deletions
diff --git a/debian/patches/src_libgo_go_net_sendfile_gnu.go.diff b/debian/patches/src_libgo_go_net_sendfile_gnu.go.diff
new file mode 100644
index 0000000..7a4aea4
--- /dev/null
+++ b/debian/patches/src_libgo_go_net_sendfile_gnu.go.diff
@@ -0,0 +1,84 @@
+Index: gcc-6-6.2.1-4.1/src/libgo/go/net/sendfile_gnu.go
+===================================================================
+--- /dev/null
++++ gcc-6-6.2.1-4.1/src/libgo/go/net/sendfile_gnu.go
+@@ -0,0 +1,79 @@
++// 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 (
++	"io"
++	"os"
++	"syscall"
++)
++
++// maxSendfileSize is the largest chunk size we ask the kernel to copy
++// at a time.
++const maxSendfileSize int = 4 << 20
++
++// 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
++	}
++
++	if err := c.writeLock(); err != nil {
++		return 0, err, true
++	}
++	defer c.writeUnlock()
++
++	dst := c.sysfd
++	src := int(f.Fd())
++	for remain > 0 {
++		n := maxSendfileSize
++		if int64(n) > remain {
++			n = int(remain)
++		}
++		n, err1 := syscall.Sendfile(dst, src, nil, n)
++		if n > 0 {
++			written += int64(n)
++			remain -= int64(n)
++		}
++		if n == 0 && err1 == nil {
++			break
++		}
++		if err1 == syscall.EAGAIN {
++			if err1 = c.pd.WaitWrite(); err1 == nil {
++				continue
++			}
++		}
++		if err1 != nil {
++			// This includes syscall.ENOSYS (no kernel
++			// support) and syscall.EINVAL (fd types which
++			// don't implement sendfile)
++			err = err1
++			break
++		}
++	}
++	if lr != nil {
++		lr.N = remain
++	}
++	if err != nil {
++		err = os.NewSyscallError("sendfile", err)
++	}
++	return written, err, written > 0
++}