// 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"

)

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

var (

	osreldateOnce sync.Once

	osreldate     uint32

)

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

}

func anyToSockaddrGOOS(fd int, rsa *RawSockaddrAny) (Sockaddr, error) {

	return nil, EAFNOSUPPORT

}

// 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)

	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))

}

// GetsockoptXucred is a getsockopt wrapper that returns an Xucred struct.

// The usual level and opt are SOL_LOCAL and LOCAL_PEERCRED, respectively.

func GetsockoptXucred(fd, level, opt int) (*Xucred, error) {

	x := new(Xucred)

	vallen := _Socklen(SizeofXucred)

	err := getsockopt(fd, level, opt, unsafe.Pointer(x), &vallen)

	return x, err

}

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

}

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

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

	var (

	)

	if len(buf) > 0 {

	}

	n = int(r0)

	if e1 != 0 {

		err = e1

	}

	return

}

//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) {

}

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

}

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) {

	}

	}

	return

}

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

}

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) {

}

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

}

func PtraceDetach(pid int) (err error) {

}

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

}

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

}

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

}

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

}

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) {

}

func PtraceSingleStep(pid int) (err error) {

}

/*

 * 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	Fsync(fd int) (err error)

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