// Copyright 2015 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 arm64,linux

package unix

const _SYS_dup = SYS_DUP3

//sys	EpollWait(epfd int, events []EpollEvent, msec int) (n int, err error) = SYS_EPOLL_PWAIT
//sys	Fchown(fd int, uid int, gid int) (err error)
//sys	Fstat(fd int, stat *Stat_t) (err error)
//sys	Fstatat(fd int, path string, stat *Stat_t, flags int) (err error)
//sys	Fstatfs(fd int, buf *Statfs_t) (err error)
//sys	Ftruncate(fd int, length int64) (err error)
//sysnb	Getegid() (egid int)
//sysnb	Geteuid() (euid int)
//sysnb	Getgid() (gid int)
//sysnb	Getrlimit(resource int, rlim *Rlimit) (err error)
//sysnb	Getuid() (uid int)
//sys	Listen(s int, n int) (err error)
//sys	Pread(fd int, p []byte, offset int64) (n int, err error) = SYS_PREAD64
//sys	Pwrite(fd int, p []byte, offset int64) (n int, err error) = SYS_PWRITE64
//sys	Seek(fd int, offset int64, whence int) (off int64, err error) = SYS_LSEEK
//sys	Select(nfd int, r *FdSet, w *FdSet, e *FdSet, timeout *Timeval) (n int, err error) = SYS_PSELECT6
//sys	sendfile(outfd int, infd int, offset *int64, count int) (written int, err error)
//sys	Setfsgid(gid int) (err error)
//sys	Setfsuid(uid int) (err error)
//sysnb	Setregid(rgid int, egid 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(resource int, rlim *Rlimit) (err error)
//sysnb	Setreuid(ruid int, euid int) (err error)
//sys	Shutdown(fd int, how int) (err error)
//sys	Splice(rfd int, roff *int64, wfd int, woff *int64, len int, flags int) (n int64, err error)

func Stat(path string, stat *Stat_t) (err error) {
	return Fstatat(AT_FDCWD, path, stat, 0)
}

func Lchown(path string, uid int, gid int) (err error) {
	return Fchownat(AT_FDCWD, path, uid, gid, AT_SYMLINK_NOFOLLOW)
}

func Lstat(path string, stat *Stat_t) (err error) {
	return Fstatat(AT_FDCWD, path, stat, AT_SYMLINK_NOFOLLOW)
}

//sys	Statfs(path string, buf *Statfs_t) (err error)
//sys	SyncFileRange(fd int, off int64, n int64, flags int) (err error)
//sys	Truncate(path string, length int64) (err error)
//sys	accept(s int, rsa *RawSockaddrAny, addrlen *_Socklen) (fd int, err error)
//sys	accept4(s int, rsa *RawSockaddrAny, addrlen *_Socklen, flags int) (fd int, err error)
//sys	bind(s int, addr unsafe. Pointer, addrlen _Socklen) (err error)
//sys	connect(s int, addr unsafe. Pointer, addrlen _Socklen) (err error)
//sysnb	getgroups(n int, list *_Gid_t) (nn int, err error)
//sysnb	setgroups(n int, list *_Gid_t) (err error)
//sys	getsockopt(s int, level int, name int, val unsafe. Pointer, vallen *_Socklen) (err error)
//sys	setsockopt(s int, level int, name int, val unsafe. Pointer, vallen uintptr) (err error)
//sysnb	socket(domain int, typ int, proto int) (fd int, err error)
//sysnb	socketpair(domain int, typ int, proto int, fd *[2]int32) (err error)
//sysnb	getpeername(fd int, rsa *RawSockaddrAny, addrlen *_Socklen) (err error)
//sysnb	getsockname(fd int, rsa *RawSockaddrAny, addrlen *_Socklen) (err error)
//sys	recvfrom(fd int, p []byte, flags int, from *RawSockaddrAny, fromlen *_Socklen) (n int, err error)
//sys	sendto(s int, buf []byte, flags int, to unsafe. Pointer, addrlen _Socklen) (err error)
//sys	recvmsg(s int, msg *Msghdr, flags int) (n int, err error)
//sys	sendmsg(s int, msg *Msghdr, flags int) (n int, err error)
//sys	mmap(addr uintptr, length uintptr, prot int, flags int, fd int, offset int64) (xaddr uintptr, err error)

func Getpagesize() int { return 65536 }

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

func TimespecToNsec(ts Timespec) int64 { return int64(ts. Sec)*1e9 + int64(ts. Nsec) }

func NsecToTimespec(nsec int64) (ts Timespec) {
	ts. Sec = nsec / 1e9
	ts. Nsec = nsec % 1e9
	return
}

func NsecToTimeval(nsec int64) (tv Timeval) {
	nsec += 999 // round up to microsecond
	tv. Sec = nsec / 1e9
	tv. Usec = nsec % 1e9 / 1e3
	return
}

func Time(t *Time_t) (Time_t, error) {
	var tv Timeval
	err := Gettimeofday(&tv)
	if err ! = nil {
		return 0, err
	}
	if t ! = nil {
		*t = Time_t(tv. Sec)
	}
	return Time_t(tv. Sec), nil
}

func Utime(path string, buf *Utimbuf) error {
	tv := []Timeval{
		{Sec: buf. Actime},
		{Sec: buf. Modtime},
	}
	return Utimes(path, tv)
}

func Pipe(p []int) (err error) {
	if len(p) ! = 2 {
		return EINVAL
	}
	var pp [2]_C_int
	err = pipe2(&pp, 0)
	p[0] = int(pp[0])
	p[1] = int(pp[1])
	return
}

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

func Pipe2(p []int, flags int) (err 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
}

func (r *PtraceRegs) PC() uint64 { return r.Pc }

func (r *PtraceRegs) SetPC(pc uint64) { r.Pc = pc }

func (iov *Iovec) SetLen(length int) {
	iov. Len = uint64(length)
}

func (msghdr *Msghdr) SetControllen(length int) {
	msghdr. Controllen = uint64(length)
}

func (cmsg *Cmsghdr) SetLen(length int) {
	cmsg. Len = uint64(length)
}

func InotifyInit() (fd int, err error) {
	return InotifyInit1(0)
}

func Dup2(oldfd int, newfd int) (err error) {
	return Dup3(oldfd, newfd, 0)
}

func Pause() (err error) {
	_, _, e1 := Syscall6(SYS_PPOLL, 0, 0, 0, 0, 0, 0)
	if e1 ! = 0 {
		err = errnoErr(e1)
	}
	return
}

// TODO(dfc): constants that should be in zsysnum_linux_arm64.go, remove
// these when the deprecated syscalls that the syscall package relies on
// are removed. 
const (
	SYS_GETPGRP      = 1060
	SYS_UTIMES       = 1037
	SYS_FUTIMESAT    = 1066
	SYS_PAUSE        = 1061
	SYS_USTAT        = 1070
	SYS_UTIME        = 1063
	SYS_LCHOWN       = 1032
	SYS_TIME         = 1062
	SYS_EPOLL_CREATE = 1042
	SYS_EPOLL_WAIT   = 1069
)

func Poll(fds []PollFd, timeout int) (n int, err error) {
	var ts *Timespec
	if timeout >= 0 {
		ts = new(Timespec)
		*ts = NsecToTimespec(int64(timeout) * 1e6)
	}
	if len(fds) == 0 {
		return ppoll(nil, 0, ts, nil)
	}
	return ppoll(&fds[0], len(fds), ts, nil)
}
