// Use of this source code is governed by a BSD-style

// license that can be found in the LICENSE file.

package unix

import "unsafe"

//sys	EpollWait(epfd int, events []EpollEvent, msec int) (n int, err error) = SYS_EPOLL_PWAIT

//sys	Fadvise(fd int, offset int64, length int64, advice int) (err error) = SYS_FADVISE64

//sys	Fchown(fd int, uid int, gid 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	Getuid() (uid int)

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

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

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

	var ts *Timespec

	if timeout != nil {

		ts = &Timespec{Sec: timeout.Sec, Nsec: timeout.Usec * 1000}

	}

	return Pselect(nfd, r, w, e, ts, nil)

}

//sys	sendfile(outfd int, infd int, offset *int64, count int) (written int, err error)

//sys	setfsgid(gid int) (prev int, err error)

//sys	setfsuid(uid int) (prev 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	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)

func Ustat(dev int, ubuf *Ustat_t) (err error) {

	return ENOSYS

}

//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)

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

func setTimespec(sec, nsec int64) Timespec {

	return Timespec{Sec: sec, Nsec: nsec}

}

func setTimeval(sec, usec int64) Timeval {

	return Timeval{Sec: sec, Usec: usec}

}

func futimesat(dirfd int, path string, tv *[2]Timeval) (err error) {

	if tv == nil {

		return utimensat(dirfd, path, nil, 0)

	}

	ts := []Timespec{

		NsecToTimespec(TimevalToNsec(tv[0])),

		NsecToTimespec(TimevalToNsec(tv[1])),

	}

	return utimensat(dirfd, path, (*[2]Timespec)(unsafe.Pointer(&ts[0])), 0)

}

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 utimes(path string, tv *[2]Timeval) (err error) {

	if tv == nil {

		return utimensat(AT_FDCWD, path, nil, 0)

	}

	ts := []Timespec{

		NsecToTimespec(TimevalToNsec(tv[0])),

		NsecToTimespec(TimevalToNsec(tv[1])),

	}

	return utimensat(AT_FDCWD, path, (*[2]Timespec)(unsafe.Pointer(&ts[0])), 0)

}

func (iov *Iovec) SetLen(length int) {

	iov.Len = uint64(length)

}

func (msghdr *Msghdr) SetControllen(length int) {

	msghdr.Controllen = uint64(length)

}

func (msghdr *Msghdr) SetIovlen(length int) {

	msghdr.Iovlen = uint64(length)

}

func (cmsg *Cmsghdr) SetLen(length int) {

	cmsg.Len = uint64(length)

}

func (rsa *RawSockaddrNFCLLCP) SetServiceNameLen(length int) {

	rsa.Service_name_len = uint64(length)

}

func Pause() error {

	_, err := ppoll(nil, 0, nil, nil)

	return err

}

func Renameat(olddirfd int, oldpath string, newdirfd int, newpath string) (err error) {

	return Renameat2(olddirfd, oldpath, newdirfd, newpath, 0)

}

//sys	kexecFileLoad(kernelFd int, initrdFd int, cmdlineLen int, cmdline string, flags int) (err error)

func KexecFileLoad(kernelFd int, initrdFd int, cmdline string, flags int) error {

	cmdlineLen := len(cmdline)

	if cmdlineLen > 0 {

		// Account for the additional NULL byte added by

		// BytePtrFromString in kexecFileLoad. The kexec_file_load

		// syscall expects a NULL-terminated string.

		cmdlineLen++

	}

	return kexecFileLoad(kernelFd, initrdFd, cmdlineLen, cmdline, flags)

}