// 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.

// OpenBSD 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 (
    "sort"
    "syscall"
    "unsafe"
)

// 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   [24]int8
    raw    RawSockaddrDatalink
}

func Syscall9(trap, a1, a2, a3, a4, a5, a6, a7, a8, a9 uintptr) (r1, r2 uintptr, err syscall.Errno)

func nametomib(name string) (mib []_C_int, err error) {
    i := sort.Search(len(sysctlMib), func(i int) bool {
        return sysctlMib[i].ctlname >= name
    })
    if i < len(sysctlMib) && sysctlMib[i].ctlname == name {
        return sysctlMib[i].ctloid, nil
    }
    return nil, EINVAL
}

func SysctlUvmexp(name string) (*Uvmexp, error) {
    mib, err := sysctlmib(name)
    if err != nil {
        return nil, err
    }

    n := uintptr(SizeofUvmexp)
    var u Uvmexp
    if err := sysctl(mib, (*byte)(unsafe.Pointer(&u)), &n, nil, 0); err != nil {
        return nil, err
    }
    if n != SizeofUvmexp {
        return nil, EIO
    }
    return &u, nil
}

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

//sys getdents(fd int, buf []byte) (n int, err error)
func Getdirentries(fd int, buf []byte, basep *uintptr) (n int, err error) {
    return getdents(fd, buf)
}

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 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)
}

// TODO
func sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) {
    return -1, ENOSYS
}

func Getfsstat(buf []Statfs_t, flags int) (n int, err error) {
    var _p0 unsafe.Pointer
    var bufsize uintptr
    if len(buf) > 0 {
        _p0 = unsafe.Pointer(&buf[0])
        bufsize = unsafe.Sizeof(Statfs_t{}) * uintptr(len(buf))
    }
    r0, _, e1 := Syscall(SYS_GETFSSTAT, uintptr(_p0), bufsize, uintptr(flags))
    n = int(r0)
    if e1 != 0 {
        err = e1
    }
    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)

// ioctl itself should not be exposed directly, but additional get/set
// functions for specific types are permissible.

// IoctlSetInt performs an ioctl operation which sets an integer value
// on fd, using the specified request number.
func IoctlSetInt(fd int, req uint, value int) error {
    return ioctl(fd, req, uintptr(value))
}

func ioctlSetWinsize(fd int, req uint, value *Winsize) error {
    return ioctl(fd, req, uintptr(unsafe.Pointer(value)))
}

func ioctlSetTermios(fd int, req uint, value *Termios) error {
    return ioctl(fd, req, uintptr(unsafe.Pointer(value)))
}

// IoctlGetInt performs an ioctl operation which gets an integer value
// from fd, using the specified request number.
func IoctlGetInt(fd int, req uint) (int, error) {
    var value int
    err := ioctl(fd, req, uintptr(unsafe.Pointer(&value)))
    return value, err
}

func IoctlGetWinsize(fd int, req uint) (*Winsize, error) {
    var value Winsize
    err := ioctl(fd, req, uintptr(unsafe.Pointer(&value)))
    return &value, err
}

func IoctlGetTermios(fd int, req uint) (*Termios, error) {
    var value Termios
    err := ioctl(fd, req, uintptr(unsafe.Pointer(&value)))
    return &value, err
}

//sys   ppoll(fds *PollFd, nfds int, timeout *Timespec, sigmask *Sigset_t) (n int, err error)

func Ppoll(fds []PollFd, timeout *Timespec, sigmask *Sigset_t) (n int, err error) {
    if len(fds) == 0 {
        return ppoll(nil, 0, timeout, sigmask)
    }
    return ppoll(&fds[0], len(fds), timeout, sigmask)
}

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
}

/*
 * Exposed directly
 */
//sys   Access(path string, mode uint32) (err error)
//sys   Adjtime(delta *Timeval, olddelta *Timeval) (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   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_t) (err error)
//sys   Fstatat(fd int, path string, stat *Stat_t, flags int) (err error)
//sys   Fstatfs(fd int, stat *Statfs_t) (err error)
//sys   Fsync(fd int) (err error)
//sys   Ftruncate(fd int, length int64) (err error)
//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 Getrtable() (rtable int, 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_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   Mkfifoat(dirfd int, path string, mode uint32) (err error)
//sys   Mknod(path string, mode uint32, dev int) (err error)
//sys   Mknodat(dirfd int, path string, mode uint32, dev int) (err error)
//sys   Nanosleep(time *Timespec, leftover *Timespec) (err error)
//sys   Open(path string, mode int, perm uint32) (fd int, err error)
//sys   Openat(dirfd 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(n int, r *FdSet, w *FdSet, e *FdSet, timeout *Timeval) (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 Setrtable(rtable int) (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_t) (err error)
//sys   Statfs(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   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   utimensat(dirfd int, path string, times *[2]Timespec, flags int) (err error)

/*
 * Unimplemented
 */
// __getcwd
// __semctl
// __syscall
// __sysctl
// adjfreq
// break
// clock_getres
// clock_gettime
// clock_settime
// closefrom
// execve
// fcntl
// fhopen
// fhstat
// fhstatfs
// fork
// futimens
// getfh
// getgid
// getitimer
// getlogin
// getresgid
// getresuid
// getthrid
// ktrace
// lfs_bmapv
// lfs_markv
// lfs_segclean
// lfs_segwait
// mincore
// minherit
// mount
// mquery
// msgctl
// msgget
// msgrcv
// msgsnd
// nfssvc
// nnpfspioctl
// preadv
// profil
// pwritev
// quotactl
// readv
// reboot
// renameat
// rfork
// sched_yield
// semget
// semop
// setgroups
// setitimer
// setsockopt
// shmat
// shmctl
// shmdt
// shmget
// sigaction
// sigaltstack
// sigpending
// sigprocmask
// sigreturn
// sigsuspend
// sysarch
// syscall
// threxit
// thrsigdivert
// thrsleep
// thrwakeup
// vfork
// writev