POLLNVAL   = 0x20
	POLLOUT    = 0x4
	POLLPRI    = 0x2
	POLLRDBAND = 0x80
	POLLRDNORM = 0x40
	POLLWRBAND = 0x100
	POLLWRNORM = 0x4
)

type Sigset_t uint32

type Utsname struct {
	Sysname  [256]byte
	Nodename [256]byte
	Release  [256]byte
	Version  [256]byte
	Machine  [256]byte
}

const SizeofUvmexp = 0x158

type Uvmexp struct {
	Pagesize           int32

	POLLPRI      = 0x2
	POLLRDBAND   = 0x80
	POLLRDNORM   = 0x40
	POLLWRBAND   = 0x100
	POLLWRNORM   = 0x4
)

type CapRights struct {
	Rights [2]uint64
}

type Utsname struct {
	Sysname  [256]byte
	Nodename [256]byte
	Release  [256]byte
	Version  [256]byte
	Machine  [256]byte
}

const SizeofClockinfo = 0x14

type Clockinfo struct {
	Hz     int32
	Tick   int32

	Bufferram uint32
	Totalswap uint32
	Freeswap  uint32
	Procs     uint16
	Pad       uint16
	Totalhigh uint32
	Freehigh  uint32
	Unit      uint32
	X_f       [8]int8
}

type Utsname struct {
	Sysname    [65]int8
	Nodename   [65]int8
	Release    [65]int8
	Version    [65]int8
	Machine    [65]int8
	Domainname [65]int8
}

type Ustat_t struct {
	Tfree  int32
	Tinode uint32

	Bufferram uint32
	Totalswap uint32
	Freeswap  uint32
	Procs     uint16
	Pad       uint16
	Totalhigh uint32
	Freehigh  uint32
	Unit      uint32
	X_f       [8]int8
}

type Utsname struct {
	Sysname    [65]int8
	Nodename   [65]int8
	Release    [65]int8
	Version    [65]int8
	Machine    [65]int8
	Domainname [65]int8
}

type Ustat_t struct {
	Tfree  int32
	Tinode uint32

	Bufferram uint32
	Totalswap uint32
	Freeswap  uint32
	Procs     uint16
	Pad       uint16
	Totalhigh uint32
	Freehigh  uint32
	Unit      uint32
	X_f       [8]int8
}

type Utsname struct {
	Sysname    [65]int8
	Nodename   [65]int8
	Release    [65]int8
	Version    [65]int8
	Machine    [65]int8
	Domainname [65]int8
}

type Ustat_t struct {
	Tfree  int32
	Tinode uint32

	Freeswap  uint64
	Procs     uint16
	Pad       uint16
	Pad_cgo_0 [4]byte
	Totalhigh uint64
	Freehigh  uint64
	Unit      uint32
	X_f       [0]byte
	Pad_cgo_1 [4]byte
}

type Utsname struct {
	Sysname    [65]int8
	Nodename   [65]int8
	Release    [65]int8
	Version    [65]int8
	Machine    [65]int8
	Domainname [65]int8
}

type Ustat_t struct {
	Tfree     int32
	Pad_cgo_0 [4]byte

}

//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)

	}
	goCmd = appendCompilerFlags(goCmd)
	if vflag > 0 {
		goCmd = append(goCmd, "-v")
	}

	// Force only one process at a time on vx32 emulation.
	if gohostos == "plan9" && os.Getenv("sysname") == "vx32" {
		goCmd = append(goCmd, "-p=1")
	}

	runEnv(workdir, ShowOutput|CheckExit, env, append(goCmd, args...)...)
}

func checkNotStale(env []string, goBinary string, targets ...string) {

//sys   Select(nmsgsfds int, r *FdSet, w *FdSet, e *FdSet, timeout *Timeval) (ret int, err error) = SYS_SELECT
//sysnb Uname(buf *Utsname) (err error) = SYS_____OSNAME_A
//sys   Unshare(flags int) (err error) = SYS_UNSHARE

func Ptsname(fd int) (name string, err error) {
	runtime.EnterSyscall()
	r0, e2, e1 := CallLeFuncWithPtrReturn(GetZosLibVec()+SYS___PTSNAME_A<<4, uintptr(fd))
	runtime.ExitSyscall()

	if strings.Contains(hostname, "\x00") {
		t.Fatalf("unexpected zero byte in hostname: %q", hostname)
	}

	// There is no other way to fetch hostname on windows, but via winapi.
	// On Plan 9 it can be taken from #c/sysname as Hostname() does.
	switch runtime.GOOS {
	case "android", "plan9":
		// No /bin/hostname to verify against.
		return
	case "windows":
		testWindowsHostname(t, hostname)
		return
	}