1 files changed, 106 insertions, 0 deletions

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..c3a62db
--- /dev/null
+++ b/vendor/golang.org/x/sys/unix/sockcmsg_unix.go
@@ -0,0 +1,106 @@
+// 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.
+
+//go:build aix || darwin || dragonfly || freebsd || linux || netbsd || openbsd || solaris || zos
+
+// Socket control messages
+
+package unix
+
+import (
+        "unsafe"
+)
+
+// 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 (h *Cmsghdr) data(offset uintptr) unsafe.Pointer {
+        return unsafe.Pointer(uintptr(unsafe.Pointer(h)) + uintptr(cmsgAlignOf(SizeofCmsghdr)) + offset)
+}
+
+// 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
+}
+
+// ParseOneSocketControlMessage parses a single socket control message from b, returning the message header,
+// message data (a slice of b), and the remainder of b after that single message.
+// When there are no remaining messages, len(remainder) == 0.
+func ParseOneSocketControlMessage(b []byte) (hdr Cmsghdr, data []byte, remainder []byte, err error) {
+        h, dbuf, err := socketControlMessageHeaderAndData(b)
+        if err != nil {
+                return Cmsghdr{}, nil, nil, err
+        }
+        if i := cmsgAlignOf(int(h.Len)); i < len(b) {
+                remainder = b[i:]
+        }
+        return *h, dbuf, remainder, 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))
+        for i, fd := range fds {
+                *(*int32)(h.data(4 * uintptr(i))) = int32(fd)
+        }
+        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
+}