diff options
Diffstat (limited to 'vendor/golang.org/x/sys/unix/sockcmsg_unix.go')
-rw-r--r-- | vendor/golang.org/x/sys/unix/sockcmsg_unix.go | 104 |
1 files changed, 0 insertions, 104 deletions
diff --git a/vendor/golang.org/x/sys/unix/sockcmsg_unix.go b/vendor/golang.org/x/sys/unix/sockcmsg_unix.go deleted file mode 100644 index 9dd2f32f5..000000000 --- a/vendor/golang.org/x/sys/unix/sockcmsg_unix.go +++ /dev/null @@ -1,104 +0,0 @@ -// 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 "unsafe" - -// Round the length of a raw sockaddr up to align it properly. -func cmsgAlignOf(salen int) int { - salign := SizeofPtr - // NOTE: It seems like 64-bit Darwin, DragonFly BSD and - // Solaris kernels still require 32-bit aligned access to - // network subsystem. - if darwin64Bit || dragonfly64Bit || solaris64Bit { - salign = 4 - } - 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 -} |