initial add - go fmt on grpc
Change-Id: Ib0afadd2fe5571d1456a091f94f5644458f7d3f4
diff --git a/vendor/golang.org/x/sys/unix/sockcmsg_unix.go b/vendor/golang.org/x/sys/unix/sockcmsg_unix.go
new file mode 100644
index 0000000..062bcab
--- /dev/null
+++ b/vendor/golang.org/x/sys/unix/sockcmsg_unix.go
@@ -0,0 +1,120 @@
+// 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.
+
+// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris
+
+// Socket control messages
+
+package unix
+
+import (
+ "runtime"
+ "unsafe"
+)
+
+// Round the length of a raw sockaddr up to align it properly.
+func cmsgAlignOf(salen int) int {
+ salign := SizeofPtr
+
+ switch runtime.GOOS {
+ case "aix":
+ // There is no alignment on AIX.
+ salign = 1
+ case "darwin", "dragonfly", "solaris", "illumos":
+ // NOTE: It seems like 64-bit Darwin, DragonFly BSD,
+ // illumos, and Solaris kernels still require 32-bit
+ // aligned access to network subsystem.
+ if SizeofPtr == 8 {
+ salign = 4
+ }
+ case "netbsd", "openbsd":
+ // NetBSD and OpenBSD armv7 require 64-bit alignment.
+ if runtime.GOARCH == "arm" {
+ salign = 8
+ }
+ }
+
+ return (salen + salign - 1) & ^(salign - 1)
+}
+
+// CmsgLen returns the value to store in the Len field of the Cmsghdr
+// structure, taking into account any necessary alignment.
+func CmsgLen(datalen int) int {
+ return cmsgAlignOf(SizeofCmsghdr) + datalen
+}
+
+// CmsgSpace returns the number of bytes an ancillary element with
+// payload of the passed data length occupies.
+func CmsgSpace(datalen int) int {
+ return cmsgAlignOf(SizeofCmsghdr) + cmsgAlignOf(datalen)
+}
+
+func cmsgData(h *Cmsghdr) unsafe.Pointer {
+ return unsafe.Pointer(uintptr(unsafe.Pointer(h)) + uintptr(cmsgAlignOf(SizeofCmsghdr)))
+}
+
+// SocketControlMessage represents a socket control message.
+type SocketControlMessage struct {
+ Header Cmsghdr
+ Data []byte
+}
+
+// ParseSocketControlMessage parses b as an array of socket control
+// messages.
+func ParseSocketControlMessage(b []byte) ([]SocketControlMessage, error) {
+ var msgs []SocketControlMessage
+ i := 0
+ for i+CmsgLen(0) <= len(b) {
+ h, dbuf, err := socketControlMessageHeaderAndData(b[i:])
+ if err != nil {
+ return nil, err
+ }
+ m := SocketControlMessage{Header: *h, Data: dbuf}
+ msgs = append(msgs, m)
+ i += cmsgAlignOf(int(h.Len))
+ }
+ return msgs, nil
+}
+
+func socketControlMessageHeaderAndData(b []byte) (*Cmsghdr, []byte, error) {
+ h := (*Cmsghdr)(unsafe.Pointer(&b[0]))
+ if h.Len < SizeofCmsghdr || uint64(h.Len) > uint64(len(b)) {
+ return nil, nil, EINVAL
+ }
+ return h, b[cmsgAlignOf(SizeofCmsghdr):h.Len], nil
+}
+
+// UnixRights encodes a set of open file descriptors into a socket
+// control message for sending to another process.
+func UnixRights(fds ...int) []byte {
+ datalen := len(fds) * 4
+ b := make([]byte, CmsgSpace(datalen))
+ h := (*Cmsghdr)(unsafe.Pointer(&b[0]))
+ h.Level = SOL_SOCKET
+ h.Type = SCM_RIGHTS
+ h.SetLen(CmsgLen(datalen))
+ data := cmsgData(h)
+ for _, fd := range fds {
+ *(*int32)(data) = int32(fd)
+ data = unsafe.Pointer(uintptr(data) + 4)
+ }
+ return b
+}
+
+// ParseUnixRights decodes a socket control message that contains an
+// integer array of open file descriptors from another process.
+func ParseUnixRights(m *SocketControlMessage) ([]int, error) {
+ if m.Header.Level != SOL_SOCKET {
+ return nil, EINVAL
+ }
+ if m.Header.Type != SCM_RIGHTS {
+ return nil, EINVAL
+ }
+ fds := make([]int, len(m.Data)>>2)
+ for i, j := 0, 0; i < len(m.Data); i += 4 {
+ fds[j] = int(*(*int32)(unsafe.Pointer(&m.Data[i])))
+ j++
+ }
+ return fds, nil
+}