// Copyright 2009,2010 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.

// FreeBSD system calls.

// This file is compiled as ordinary Go code,

// but it is also input to mksyscall,

// which parses the //sys lines and generates system call stubs.

// Note that sometimes we use a lowercase //sys name and wrap

// it in our own nicer implementation, either here or in

// syscall_bsd.go or syscall_unix.go.

package unix

import (

	"sync"

	"unsafe"

)

const (

	SYS_FSTAT_FREEBSD12         = 551 // { int fstat(int fd, _Out_ struct stat *sb); }

	SYS_FSTATAT_FREEBSD12       = 552 // { int fstatat(int fd, _In_z_ char *path, \

	SYS_GETDIRENTRIES_FREEBSD12 = 554 // { ssize_t getdirentries(int fd, \

	SYS_STATFS_FREEBSD12        = 555 // { int statfs(_In_z_ char *path, \

	SYS_FSTATFS_FREEBSD12       = 556 // { int fstatfs(int fd, \

	SYS_GETFSSTAT_FREEBSD12     = 557 // { int getfsstat( \

	SYS_MKNODAT_FREEBSD12       = 559 // { int mknodat(int fd, _In_z_ char *path, \

)

// See https://www.freebsd.org/doc/en_US.ISO8859-1/books/porters-handbook/versions.html.

var (

	osreldateOnce sync.Once

	osreldate     uint32

)

// INO64_FIRST from /usr/src/lib/libc/sys/compat-ino64.h

const _ino64First = 1200031

func supportsABI(ver uint32) bool {

	osreldateOnce.Do(func() { osreldate, _ = SysctlUint32("kern.osreldate") })

	return osreldate >= ver

}

// SockaddrDatalink implements the Sockaddr interface for AF_LINK type sockets.

type SockaddrDatalink struct {

	Len    uint8

	Family uint8

	Index  uint16

	Type   uint8

	Nlen   uint8

	Alen   uint8

	Slen   uint8

	Data   [46]int8

	raw    RawSockaddrDatalink

}

// Translate "kern.hostname" to []_C_int{0,1,2,3}.

func nametomib(name string) (mib []_C_int, err error) {

	const siz = unsafe.Sizeof(mib[0])

	// NOTE(rsc): It seems strange to set the buffer to have

	// size CTL_MAXNAME+2 but use only CTL_MAXNAME

	// as the size. I don't know why the +2 is here, but the

	// kernel uses +2 for its own implementation of this function.

	// I am scared that if we don't include the +2 here, the kernel

	// will silently write 2 words farther than we specify

	// and we'll get memory corruption.

	var buf [CTL_MAXNAME + 2]_C_int

	n := uintptr(CTL_MAXNAME) * siz

	p := (*byte)(unsafe.Pointer(&buf[0]))

	bytes, err := ByteSliceFromString(name)

	if err != nil {

		return nil, err

	}

	// Magic sysctl: "setting" 0.3 to a string name

	// lets you read back the array of integers form.

	if err = sysctl([]_C_int{0, 3}, p, &n, &bytes[0], uintptr(len(name))); err != nil {

		return nil, err

	}

	return buf[0 : n/siz], nil

}

func direntIno(buf []byte) (uint64, bool) {

	return readInt(buf, unsafe.Offsetof(Dirent{}.Fileno), unsafe.Sizeof(Dirent{}.Fileno))

}

func direntReclen(buf []byte) (uint64, bool) {

	return readInt(buf, unsafe.Offsetof(Dirent{}.Reclen), unsafe.Sizeof(Dirent{}.Reclen))

}

func direntNamlen(buf []byte) (uint64, bool) {

	return readInt(buf, unsafe.Offsetof(Dirent{}.Namlen), unsafe.Sizeof(Dirent{}.Namlen))

}

func Pipe(p []int) (err error) {

	return Pipe2(p, 0)

}

//sysnb	pipe2(p *[2]_C_int, flags int) (err error)

func Pipe2(p []int, flags int) error {

	if len(p) != 2 {

		return EINVAL

	}

	var pp [2]_C_int

	err := pipe2(&pp, flags)

	p[0] = int(pp[0])

	p[1] = int(pp[1])

	return err

}

func GetsockoptIPMreqn(fd, level, opt int) (*IPMreqn, error) {

	var value IPMreqn

	vallen := _Socklen(SizeofIPMreqn)

	errno := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen)

	return &value, errno

}

func SetsockoptIPMreqn(fd, level, opt int, mreq *IPMreqn) (err error) {

	return setsockopt(fd, level, opt, unsafe.Pointer(mreq), unsafe.Sizeof(*mreq))

}

func Accept4(fd, flags int) (nfd int, sa Sockaddr, err error) {

	var rsa RawSockaddrAny

	var len _Socklen = SizeofSockaddrAny

	nfd, err = accept4(fd, &rsa, &len, flags)

	if err != nil {

		return

	}

	if len > SizeofSockaddrAny {

		panic("RawSockaddrAny too small")

	}

	sa, err = anyToSockaddr(fd, &rsa)

	if err != nil {

		Close(nfd)

		nfd = 0

	}

	return

}

const ImplementsGetwd = true

//sys	Getcwd(buf []byte) (n int, err error) = SYS___GETCWD

func Getwd() (string, error) {

	var buf [PathMax]byte

	_, err := Getcwd(buf[0:])

	if err != nil {

		return "", err

	}

	n := clen(buf[:])

	if n < 1 {

		return "", EINVAL

	}

	return string(buf[:n]), nil

}

func Getfsstat(buf []Statfs_t, flags int) (n int, err error) {

	var (

		_p0          unsafe.Pointer

		bufsize      uintptr

		oldBuf       []statfs_freebsd11_t

		needsConvert bool

	)

	if len(buf) > 0 {

		if supportsABI(_ino64First) {

			_p0 = unsafe.Pointer(&buf[0])

			bufsize = unsafe.Sizeof(Statfs_t{}) * uintptr(len(buf))

		} else {

			n := len(buf)

			oldBuf = make([]statfs_freebsd11_t, n)

			_p0 = unsafe.Pointer(&oldBuf[0])

			bufsize = unsafe.Sizeof(statfs_freebsd11_t{}) * uintptr(n)

			needsConvert = true

		}

	}

	var sysno uintptr = SYS_GETFSSTAT

	if supportsABI(_ino64First) {

		sysno = SYS_GETFSSTAT_FREEBSD12

	}

	r0, _, e1 := Syscall(sysno, uintptr(_p0), bufsize, uintptr(flags))

	n = int(r0)

	if e1 != 0 {

		err = e1

	}

	if e1 == 0 && needsConvert {

		for i := range oldBuf {

			buf[i].convertFrom(&oldBuf[i])

		}

	}

	return

}

func setattrlistTimes(path string, times []Timespec, flags int) error {

	// used on Darwin for UtimesNano

	return ENOSYS

}

//sys   ioctl(fd int, req uint, arg uintptr) (err error)

//sys   sysctl(mib []_C_int, old *byte, oldlen *uintptr, new *byte, newlen uintptr) (err error) = SYS___SYSCTL

func Uname(uname *Utsname) error {

	mib := []_C_int{CTL_KERN, KERN_OSTYPE}

	n := unsafe.Sizeof(uname.Sysname)

	if err := sysctl(mib, &uname.Sysname[0], &n, nil, 0); err != nil {

		return err

	}

	mib = []_C_int{CTL_KERN, KERN_HOSTNAME}

	n = unsafe.Sizeof(uname.Nodename)

	if err := sysctl(mib, &uname.Nodename[0], &n, nil, 0); err != nil {

		return err

	}

	mib = []_C_int{CTL_KERN, KERN_OSRELEASE}

	n = unsafe.Sizeof(uname.Release)

	if err := sysctl(mib, &uname.Release[0], &n, nil, 0); err != nil {

		return err

	}

	mib = []_C_int{CTL_KERN, KERN_VERSION}

	n = unsafe.Sizeof(uname.Version)

	if err := sysctl(mib, &uname.Version[0], &n, nil, 0); err != nil {

		return err

	}

	// The version might have newlines or tabs in it, convert them to

	// spaces.

	for i, b := range uname.Version {

		if b == '\n' || b == '\t' {

			if i == len(uname.Version)-1 {

				uname.Version[i] = 0

			} else {

				uname.Version[i] = ' '

			}

		}

	}

	mib = []_C_int{CTL_HW, HW_MACHINE}

	n = unsafe.Sizeof(uname.Machine)

	if err := sysctl(mib, &uname.Machine[0], &n, nil, 0); err != nil {

		return err

	}

	return nil

}

func Stat(path string, st *Stat_t) (err error) {

	var oldStat stat_freebsd11_t

	if supportsABI(_ino64First) {

		return fstatat_freebsd12(AT_FDCWD, path, st, 0)

	}

	err = stat(path, &oldStat)

	if err != nil {

		return err

	}

	st.convertFrom(&oldStat)

	return nil

}

func Lstat(path string, st *Stat_t) (err error) {

	var oldStat stat_freebsd11_t

	if supportsABI(_ino64First) {

		return fstatat_freebsd12(AT_FDCWD, path, st, AT_SYMLINK_NOFOLLOW)

	}

	err = lstat(path, &oldStat)

	if err != nil {

		return err

	}

	st.convertFrom(&oldStat)

	return nil

}

func Fstat(fd int, st *Stat_t) (err error) {

	var oldStat stat_freebsd11_t

	if supportsABI(_ino64First) {

		return fstat_freebsd12(fd, st)

	}

	err = fstat(fd, &oldStat)

	if err != nil {

		return err

	}

	st.convertFrom(&oldStat)

	return nil

}

func Fstatat(fd int, path string, st *Stat_t, flags int) (err error) {

	var oldStat stat_freebsd11_t

	if supportsABI(_ino64First) {

		return fstatat_freebsd12(fd, path, st, flags)

	}

	err = fstatat(fd, path, &oldStat, flags)

	if err != nil {

		return err

	}

	st.convertFrom(&oldStat)

	return nil

}

func Statfs(path string, st *Statfs_t) (err error) {

	var oldStatfs statfs_freebsd11_t

	if supportsABI(_ino64First) {

		return statfs_freebsd12(path, st)

	}

	err = statfs(path, &oldStatfs)

	if err != nil {

		return err

	}

	st.convertFrom(&oldStatfs)

	return nil

}

func Fstatfs(fd int, st *Statfs_t) (err error) {

	var oldStatfs statfs_freebsd11_t

	if supportsABI(_ino64First) {

		return fstatfs_freebsd12(fd, st)

	}

	err = fstatfs(fd, &oldStatfs)

	if err != nil {

		return err

	}

	st.convertFrom(&oldStatfs)

	return nil

}

func Getdents(fd int, buf []byte) (n int, err error) {

	return Getdirentries(fd, buf, nil)

}

func Getdirentries(fd int, buf []byte, basep *uintptr) (n int, err error) {

	if supportsABI(_ino64First) {

		if basep == nil || unsafe.Sizeof(*basep) == 8 {

			return getdirentries_freebsd12(fd, buf, (*uint64)(unsafe.Pointer(basep)))

		}

		// The freebsd12 syscall needs a 64-bit base. On 32-bit machines

		// we can't just use the basep passed in. See #32498.

		var base uint64 = uint64(*basep)

		n, err = getdirentries_freebsd12(fd, buf, &base)

		*basep = uintptr(base)

		if base>>32 != 0 {

			// We can't stuff the base back into a uintptr, so any

			// future calls would be suspect. Generate an error.

			// EIO is allowed by getdirentries.

			err = EIO

		}

		return

	}

	// The old syscall entries are smaller than the new. Use 1/4 of the original

	// buffer size rounded up to DIRBLKSIZ (see /usr/src/lib/libc/sys/getdirentries.c).

	oldBufLen := roundup(len(buf)/4, _dirblksiz)

	oldBuf := make([]byte, oldBufLen)

	n, err = getdirentries(fd, oldBuf, basep)

	if err == nil && n > 0 {

		n = convertFromDirents11(buf, oldBuf[:n])

	}

	return

}

func Mknod(path string, mode uint32, dev uint64) (err error) {

	var oldDev int

	if supportsABI(_ino64First) {

		return mknodat_freebsd12(AT_FDCWD, path, mode, dev)

	}

	oldDev = int(dev)

	return mknod(path, mode, oldDev)

}

func Mknodat(fd int, path string, mode uint32, dev uint64) (err error) {

	var oldDev int

	if supportsABI(_ino64First) {

		return mknodat_freebsd12(fd, path, mode, dev)

	}

	oldDev = int(dev)

	return mknodat(fd, path, mode, oldDev)

}

// round x to the nearest multiple of y, larger or equal to x.

//

// from /usr/include/sys/param.h Macros for counting and rounding.

// #define roundup(x, y)   ((((x)+((y)-1))/(y))*(y))

func roundup(x, y int) int {

	return ((x + y - 1) / y) * y

}

func (s *Stat_t) convertFrom(old *stat_freebsd11_t) {

	*s = Stat_t{

		Dev:     uint64(old.Dev),

		Ino:     uint64(old.Ino),

		Nlink:   uint64(old.Nlink),

		Mode:    old.Mode,

		Uid:     old.Uid,

		Gid:     old.Gid,

		Rdev:    uint64(old.Rdev),

		Atim:    old.Atim,

		Mtim:    old.Mtim,

		Ctim:    old.Ctim,

		Btim:    old.Btim,

		Size:    old.Size,

		Blocks:  old.Blocks,

		Blksize: old.Blksize,

		Flags:   old.Flags,

		Gen:     uint64(old.Gen),

	}

}

func (s *Statfs_t) convertFrom(old *statfs_freebsd11_t) {

	*s = Statfs_t{

		Version:     _statfsVersion,

		Type:        old.Type,

		Flags:       old.Flags,

		Bsize:       old.Bsize,

		Iosize:      old.Iosize,

		Blocks:      old.Blocks,

		Bfree:       old.Bfree,

		Bavail:      old.Bavail,

		Files:       old.Files,

		Ffree:       old.Ffree,

		Syncwrites:  old.Syncwrites,

		Asyncwrites: old.Asyncwrites,

		Syncreads:   old.Syncreads,

		Asyncreads:  old.Asyncreads,

		// Spare

		Namemax: old.Namemax,

		Owner:   old.Owner,

		Fsid:    old.Fsid,

		// Charspare

		// Fstypename

		// Mntfromname

		// Mntonname

	}

	sl := old.Fstypename[:]

	n := clen(*(*[]byte)(unsafe.Pointer(&sl)))

	copy(s.Fstypename[:], old.Fstypename[:n])

	sl = old.Mntfromname[:]

	n = clen(*(*[]byte)(unsafe.Pointer(&sl)))

	copy(s.Mntfromname[:], old.Mntfromname[:n])

	sl = old.Mntonname[:]

	n = clen(*(*[]byte)(unsafe.Pointer(&sl)))

	copy(s.Mntonname[:], old.Mntonname[:n])

}

func convertFromDirents11(buf []byte, old []byte) int {

	const (

		fixedSize    = int(unsafe.Offsetof(Dirent{}.Name))

		oldFixedSize = int(unsafe.Offsetof(dirent_freebsd11{}.Name))

	)

	dstPos := 0

	srcPos := 0

	for dstPos+fixedSize < len(buf) && srcPos+oldFixedSize < len(old) {

		var dstDirent Dirent

		var srcDirent dirent_freebsd11

		// If multiple direntries are written, sometimes when we reach the final one,

		// we may have cap of old less than size of dirent_freebsd11.

		copy((*[unsafe.Sizeof(srcDirent)]byte)(unsafe.Pointer(&srcDirent))[:], old[srcPos:])

		reclen := roundup(fixedSize+int(srcDirent.Namlen)+1, 8)

		if dstPos+reclen > len(buf) {

			break

		}

		dstDirent.Fileno = uint64(srcDirent.Fileno)

		dstDirent.Off = 0

		dstDirent.Reclen = uint16(reclen)

		dstDirent.Type = srcDirent.Type

		dstDirent.Pad0 = 0

		dstDirent.Namlen = uint16(srcDirent.Namlen)

		dstDirent.Pad1 = 0

		copy(dstDirent.Name[:], srcDirent.Name[:srcDirent.Namlen])

		copy(buf[dstPos:], (*[unsafe.Sizeof(dstDirent)]byte)(unsafe.Pointer(&dstDirent))[:])

		padding := buf[dstPos+fixedSize+int(dstDirent.Namlen) : dstPos+reclen]

		for i := range padding {

			padding[i] = 0

		}

		dstPos += int(dstDirent.Reclen)

		srcPos += int(srcDirent.Reclen)

	}

	return dstPos

}

func Sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) {

	if raceenabled {

		raceReleaseMerge(unsafe.Pointer(&ioSync))

	}

	return sendfile(outfd, infd, offset, count)

}

//sys	ptrace(request int, pid int, addr uintptr, data int) (err error)

func PtraceAttach(pid int) (err error) {

	return ptrace(PTRACE_ATTACH, pid, 0, 0)

}

func PtraceCont(pid int, signal int) (err error) {

	return ptrace(PTRACE_CONT, pid, 1, signal)

}

func PtraceDetach(pid int) (err error) {

	return ptrace(PTRACE_DETACH, pid, 1, 0)

}

func PtraceGetFpRegs(pid int, fpregsout *FpReg) (err error) {

	return ptrace(PTRACE_GETFPREGS, pid, uintptr(unsafe.Pointer(fpregsout)), 0)

}

func PtraceGetRegs(pid int, regsout *Reg) (err error) {

	return ptrace(PTRACE_GETREGS, pid, uintptr(unsafe.Pointer(regsout)), 0)

}

func PtraceLwpEvents(pid int, enable int) (err error) {

	return ptrace(PTRACE_LWPEVENTS, pid, 0, enable)

}

func PtraceLwpInfo(pid int, info uintptr) (err error) {

	return ptrace(PTRACE_LWPINFO, pid, info, int(unsafe.Sizeof(PtraceLwpInfoStruct{})))

}

func PtracePeekData(pid int, addr uintptr, out []byte) (count int, err error) {

	return PtraceIO(PIOD_READ_D, pid, addr, out, SizeofLong)

}

func PtracePeekText(pid int, addr uintptr, out []byte) (count int, err error) {

	return PtraceIO(PIOD_READ_I, pid, addr, out, SizeofLong)

}

func PtracePokeData(pid int, addr uintptr, data []byte) (count int, err error) {

	return PtraceIO(PIOD_WRITE_D, pid, addr, data, SizeofLong)

}

func PtracePokeText(pid int, addr uintptr, data []byte) (count int, err error) {

	return PtraceIO(PIOD_WRITE_I, pid, addr, data, SizeofLong)

}

func PtraceSetRegs(pid int, regs *Reg) (err error) {

	return ptrace(PTRACE_SETREGS, pid, uintptr(unsafe.Pointer(regs)), 0)

}

func PtraceSingleStep(pid int) (err error) {

	return ptrace(PTRACE_SINGLESTEP, pid, 1, 0)

}

/*

 * Exposed directly

 */

//sys	Access(path string, mode uint32) (err error)

//sys	Adjtime(delta *Timeval, olddelta *Timeval) (err error)

//sys	CapEnter() (err error)

//sys	capRightsGet(version int, fd int, rightsp *CapRights) (err error) = SYS___CAP_RIGHTS_GET

//sys	capRightsLimit(fd int, rightsp *CapRights) (err error)

//sys	Chdir(path string) (err error)

//sys	Chflags(path string, flags int) (err error)

//sys	Chmod(path string, mode uint32) (err error)

//sys	Chown(path string, uid int, gid int) (err error)

//sys	Chroot(path string) (err error)

//sys	Close(fd int) (err error)

//sys	Dup(fd int) (nfd int, err error)

//sys	Dup2(from int, to int) (err error)

//sys	Exit(code int)

//sys	ExtattrGetFd(fd int, attrnamespace int, attrname string, data uintptr, nbytes int) (ret int, err error)

//sys	ExtattrSetFd(fd int, attrnamespace int, attrname string, data uintptr, nbytes int) (ret int, err error)

//sys	ExtattrDeleteFd(fd int, attrnamespace int, attrname string) (err error)

//sys	ExtattrListFd(fd int, attrnamespace int, data uintptr, nbytes int) (ret int, err error)

//sys	ExtattrGetFile(file string, attrnamespace int, attrname string, data uintptr, nbytes int) (ret int, err error)

//sys	ExtattrSetFile(file string, attrnamespace int, attrname string, data uintptr, nbytes int) (ret int, err error)

//sys	ExtattrDeleteFile(file string, attrnamespace int, attrname string) (err error)

//sys	ExtattrListFile(file string, attrnamespace int, data uintptr, nbytes int) (ret int, err error)

//sys	ExtattrGetLink(link string, attrnamespace int, attrname string, data uintptr, nbytes int) (ret int, err error)

//sys	ExtattrSetLink(link string, attrnamespace int, attrname string, data uintptr, nbytes int) (ret int, err error)

//sys	ExtattrDeleteLink(link string, attrnamespace int, attrname string) (err error)

//sys	ExtattrListLink(link string, attrnamespace int, data uintptr, nbytes int) (ret int, err error)

//sys	Fadvise(fd int, offset int64, length int64, advice int) (err error) = SYS_POSIX_FADVISE

//sys	Faccessat(dirfd int, path string, mode uint32, flags int) (err error)

//sys	Fchdir(fd int) (err error)

//sys	Fchflags(fd int, flags int) (err error)

//sys	Fchmod(fd int, mode uint32) (err error)

//sys	Fchmodat(dirfd int, path string, mode uint32, flags int) (err error)

//sys	Fchown(fd int, uid int, gid int) (err error)

//sys	Fchownat(dirfd int, path string, uid int, gid int, flags int) (err error)

//sys	Flock(fd int, how int) (err error)

//sys	Fpathconf(fd int, name int) (val int, err error)

//sys	fstat(fd int, stat *stat_freebsd11_t) (err error)

//sys	fstat_freebsd12(fd int, stat *Stat_t) (err error)

//sys	fstatat(fd int, path string, stat *stat_freebsd11_t, flags int) (err error)

//sys	fstatat_freebsd12(fd int, path string, stat *Stat_t, flags int) (err error)

//sys	fstatfs(fd int, stat *statfs_freebsd11_t) (err error)

//sys	fstatfs_freebsd12(fd int, stat *Statfs_t) (err error)

//sys	Fsync(fd int) (err error)

//sys	Ftruncate(fd int, length int64) (err error)

//sys	getdirentries(fd int, buf []byte, basep *uintptr) (n int, err error)

//sys	getdirentries_freebsd12(fd int, buf []byte, basep *uint64) (n int, err error)

//sys	Getdtablesize() (size int)

//sysnb	Getegid() (egid int)

//sysnb	Geteuid() (uid int)

//sysnb	Getgid() (gid int)

//sysnb	Getpgid(pid int) (pgid int, err error)

//sysnb	Getpgrp() (pgrp int)

//sysnb	Getpid() (pid int)

//sysnb	Getppid() (ppid int)

//sys	Getpriority(which int, who int) (prio int, err error)

//sysnb	Getrlimit(which int, lim *Rlimit) (err error)

//sysnb	Getrusage(who int, rusage *Rusage) (err error)

//sysnb	Getsid(pid int) (sid int, err error)

//sysnb	Gettimeofday(tv *Timeval) (err error)

//sysnb	Getuid() (uid int)

//sys	Issetugid() (tainted bool)

//sys	Kill(pid int, signum syscall.Signal) (err error)

//sys	Kqueue() (fd int, err error)

//sys	Lchown(path string, uid int, gid int) (err error)

//sys	Link(path string, link string) (err error)

//sys	Linkat(pathfd int, path string, linkfd int, link string, flags int) (err error)

//sys	Listen(s int, backlog int) (err error)

//sys	lstat(path string, stat *stat_freebsd11_t) (err error)

//sys	Mkdir(path string, mode uint32) (err error)

//sys	Mkdirat(dirfd int, path string, mode uint32) (err error)

//sys	Mkfifo(path string, mode uint32) (err error)

//sys	mknod(path string, mode uint32, dev int) (err error)

//sys	mknodat(fd int, path string, mode uint32, dev int) (err error)

//sys	mknodat_freebsd12(fd int, path string, mode uint32, dev uint64) (err error)

//sys	Nanosleep(time *Timespec, leftover *Timespec) (err error)

//sys	Open(path string, mode int, perm uint32) (fd int, err error)

//sys	Openat(fdat int, path string, mode int, perm uint32) (fd int, err error)

//sys	Pathconf(path string, name int) (val int, err error)

//sys	Pread(fd int, p []byte, offset int64) (n int, err error)

//sys	Pwrite(fd int, p []byte, offset int64) (n int, err error)

//sys	read(fd int, p []byte) (n int, err error)

//sys	Readlink(path string, buf []byte) (n int, err error)

//sys	Readlinkat(dirfd int, path string, buf []byte) (n int, err error)

//sys	Rename(from string, to string) (err error)

//sys	Renameat(fromfd int, from string, tofd int, to string) (err error)

//sys	Revoke(path string) (err error)

//sys	Rmdir(path string) (err error)

//sys	Seek(fd int, offset int64, whence int) (newoffset int64, err error) = SYS_LSEEK

//sys	Select(nfd int, r *FdSet, w *FdSet, e *FdSet, timeout *Timeval) (n int, err error)

//sysnb	Setegid(egid int) (err error)

//sysnb	Seteuid(euid int) (err error)

//sysnb	Setgid(gid int) (err error)

//sys	Setlogin(name string) (err error)

//sysnb	Setpgid(pid int, pgid int) (err error)

//sys	Setpriority(which int, who int, prio int) (err error)

//sysnb	Setregid(rgid int, egid int) (err error)

//sysnb	Setreuid(ruid int, euid int) (err error)

//sysnb	Setresgid(rgid int, egid int, sgid int) (err error)

//sysnb	Setresuid(ruid int, euid int, suid int) (err error)

//sysnb	Setrlimit(which int, lim *Rlimit) (err error)

//sysnb	Setsid() (pid int, err error)

//sysnb	Settimeofday(tp *Timeval) (err error)

//sysnb	Setuid(uid int) (err error)

//sys	stat(path string, stat *stat_freebsd11_t) (err error)

//sys	statfs(path string, stat *statfs_freebsd11_t) (err error)

//sys	statfs_freebsd12(path string, stat *Statfs_t) (err error)

//sys	Symlink(path string, link string) (err error)

//sys	Symlinkat(oldpath string, newdirfd int, newpath string) (err error)

//sys	Sync() (err error)

//sys	Truncate(path string, length int64) (err error)

//sys	Umask(newmask int) (oldmask int)

//sys	Undelete(path string) (err error)

//sys	Unlink(path string) (err error)

//sys	Unlinkat(dirfd int, path string, flags int) (err error)

//sys	Unmount(path string, flags int) (err error)

//sys	write(fd int, p []byte) (n int, err error)

//sys   mmap(addr uintptr, length uintptr, prot int, flag int, fd int, pos int64) (ret uintptr, err error)

//sys   munmap(addr uintptr, length uintptr) (err error)

//sys	readlen(fd int, buf *byte, nbuf int) (n int, err error) = SYS_READ

//sys	writelen(fd int, buf *byte, nbuf int) (n int, err error) = SYS_WRITE

//sys	accept4(fd int, rsa *RawSockaddrAny, addrlen *_Socklen, flags int) (nfd int, err error)

//sys	utimensat(dirfd int, path string, times *[2]Timespec, flags int) (err error)

/*

 * Unimplemented

 */

// Profil

// Sigaction

// Sigprocmask

// Getlogin

// Sigpending

// Sigaltstack

// Ioctl

// Reboot

// Execve

// Vfork

// Sbrk

// Sstk

// Ovadvise

// Mincore

// Setitimer

// Swapon

// Select

// Sigsuspend

// Readv

// Writev

// Nfssvc

// Getfh

// Quotactl

// Mount

// Csops

// Waitid

// Add_profil

// Kdebug_trace

// Sigreturn

// Atsocket

// Kqueue_from_portset_np

// Kqueue_portset

// Getattrlist

// Setattrlist

// Getdents

// Getdirentriesattr

// Searchfs

// Delete

// Copyfile

// Watchevent

// Waitevent

// Modwatch

// Fsctl

// Initgroups

// Posix_spawn

// Nfsclnt

// Fhopen

// Minherit

// Semsys

// Msgsys

// Shmsys

// Semctl

// Semget

// Semop

// Msgctl

// Msgget

// Msgsnd

// Msgrcv

// Shmat

// Shmctl

// Shmdt

// Shmget

// Shm_open

// Shm_unlink

// Sem_open

// Sem_close

// Sem_unlink

// Sem_wait

// Sem_trywait

// Sem_post

// Sem_getvalue

// Sem_init

// Sem_destroy

// Open_extended

// Umask_extended

// Stat_extended

// Lstat_extended

// Fstat_extended

// Chmod_extended

// Fchmod_extended

// Access_extended

// Settid

// Gettid

// Setsgroups

// Getsgroups

// Setwgroups

// Getwgroups

// Mkfifo_extended

// Mkdir_extended

// Identitysvc

// Shared_region_check_np

// Shared_region_map_np

// __pthread_mutex_destroy

// __pthread_mutex_init

// __pthread_mutex_lock

// __pthread_mutex_trylock

// __pthread_mutex_unlock

// __pthread_cond_init

// __pthread_cond_destroy

// __pthread_cond_broadcast

// __pthread_cond_signal

// Setsid_with_pid

// __pthread_cond_timedwait

// Aio_fsync

// Aio_return

// Aio_suspend

// Aio_cancel

// Aio_error

// Aio_read

// Aio_write

// Lio_listio

// __pthread_cond_wait

// Iopolicysys

// __pthread_kill

// __pthread_sigmask

// __sigwait

// __disable_threadsignal

// __pthread_markcancel

// __pthread_canceled

// __semwait_signal

// Proc_info

// Stat64_extended

// Lstat64_extended

// Fstat64_extended

// __pthread_chdir

// __pthread_fchdir

// Audit

// Auditon

// Getauid

// Setauid

// Getaudit

// Setaudit

// Getaudit_addr

// Setaudit_addr

// Auditctl

// Bsdthread_create

// Bsdthread_terminate

// Stack_snapshot

// Bsdthread_register

// Workq_open

// Workq_ops

// __mac_execve

// __mac_syscall

// __mac_get_file

// __mac_set_file

// __mac_get_link

// __mac_set_link

// __mac_get_proc

// __mac_set_proc

// __mac_get_fd

// __mac_set_fd

// __mac_get_pid

// __mac_get_lcid

// __mac_get_lctx

// __mac_set_lctx

// Setlcid

// Read_nocancel

// Write_nocancel

// Open_nocancel

// Close_nocancel

// Wait4_nocancel

// Recvmsg_nocancel

// Sendmsg_nocancel

// Recvfrom_nocancel

// Accept_nocancel

// Fcntl_nocancel

// Select_nocancel

// Fsync_nocancel

// Connect_nocancel

// Sigsuspend_nocancel

// Readv_nocancel

// Writev_nocancel

// Sendto_nocancel

// Pread_nocancel

// Pwrite_nocancel

// Waitid_nocancel

// Poll_nocancel

// Msgsnd_nocancel

// Msgrcv_nocancel

// Sem_wait_nocancel

// Aio_suspend_nocancel

// __sigwait_nocancel

// __semwait_signal_nocancel

// __mac_mount

// __mac_get_mount

// __mac_getfsstat