// 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

//go:build unix

// Socket control messages

package syscall

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

// authentication.
func UnixCredentials(ucred *Ucred) []byte {
	b := make([]byte, CmsgSpace(SizeofUcred))
	h := (*Cmsghdr)(unsafe.Pointer(&b[0]))
	h.Level = SOL_SOCKET
	h.Type = SCM_CREDENTIALS
	h.SetLen(CmsgLen(SizeofUcred))
	*(*Ucred)(h.data(0)) = *ucred
	return b
}

// ParseUnixCredentials decodes a socket control message that contains
// credentials in a Ucred structure. To receive such a message, the

// authentication.
func UnixCredentials(ucred *Ucred) []byte {
	b := make([]byte, CmsgSpace(SizeofUcred))
	h := (*Cmsghdr)(unsafe.Pointer(&b[0]))
	h.Level = SOL_SOCKET
	h.Type = SCM_CREDENTIALS
	h.SetLen(CmsgLen(SizeofUcred))
	*(*Ucred)(h.data(0)) = *ucred
	return b
}

// ParseUnixCredentials decodes a socket control message that contains
// credentials in a Ucred structure. To receive such a message, the

	if _, err := s.sr.Seek(0, io.SeekStart); err != nil {
		return nil, err
	}
	var stlen uint32
	var stoff uint64
	var nsyms uint32
	var symoff uint64
	switch f.TargetMachine {
	case U802TOCMAGIC:
		lhdr := new(LoaderHeader32)
		if err := binary.Read(s.sr, binary.BigEndian, lhdr); err != nil {
			return nil, err
		}
		stlen = lhdr.Lstlen
		stoff = uint64(lhdr.Lstoff)
		nsyms = lhdr.Lnsyms
		symoff = LDHDRSZ_32

		argLen: 0,
		reg:    regInfo{},
	},
	{
		name:   "FlagGT_UGT",
		argLen: 0,
		reg:    regInfo{},
	},
	{
		name:   "FlagGT_ULT",
		argLen: 0,
		reg:    regInfo{},
	},
	{
		name:    "MOVSSconst1",
		auxType: auxFloat32,
		argLen:  0,
		reg: regInfo{
			outputs: []outputInfo{
				{0, 239}, // AX CX DX BX BP SI DI
			},
		},
	},
	{

		[maxLen]byte{'i', '-', 'b', 'n', 'n'}:                          _bnn, // i-bnn
		[maxLen]byte{'i', '-', 'h', 'a', 'k'}:                          _hak, // i-hak
		[maxLen]byte{'i', '-', 'k', 'l', 'i', 'n', 'g', 'o', 'n'}:      _tlh, // i-klingon
		[maxLen]byte{'i', '-', 'l', 'u', 'x'}:                          _lb,  // i-lux
		[maxLen]byte{'i', '-', 'n', 'a', 'v', 'a', 'j', 'o'}:           _nv,  // i-navajo

     * @param bufferIndex
     * @param maxLen
     * @return position of terminating null bytes
     */
    public static int findUNITermination ( byte[] buffer, int bufferIndex, int maxLen ) {
        int len = 0;
        while ( buffer[ bufferIndex + len ] != (byte) 0x00 || buffer[ bufferIndex + len + 1 ] != (byte) 0x00 ) {
            len += 2;
            if ( len > maxLen ) {
                if ( log.isDebugEnabled() ) {

	g4 = make(chan cblock, big)
}

func overflowchan() {
	const ptrSize = unsafe.Sizeof(uintptr(0))
	g4 = make(chan cblock, 1<<(30*(ptrSize/4)))
}

func main() {
	shouldfail(badlen, "badlen")
	shouldfail(biglen, "biglen")
	shouldfail(badcap, "badcap")
	shouldfail(badcap1, "badcap1")
	shouldfail(bigcap, "bigcap")
	shouldfail(badchancap, "badchancap")
	shouldfail(bigchancap, "bigchancap")
	shouldfail(overflowchan, "overflowchan")

// authentication.
func UnixCredentials(ucred *Ucred) []byte {
	b := make([]byte, CmsgSpace(SizeofUcred))
	h := (*Cmsghdr)(unsafe.Pointer(&b[0]))
	h.Level = SOL_SOCKET
	h.Type = SCM_CREDENTIALS
	h.SetLen(CmsgLen(SizeofUcred))
	*(*Ucred)(h.data(0)) = *ucred
	return b
}

// ParseUnixCredentials decodes a socket control message that contains
// credentials in a Ucred structure. To receive such a message, the