// Set the controlling TTY to Ctty
	if sys.Setctty {
		_, _, err1 = RawSyscall(SYS_IOCTL, uintptr(sys.Ctty), uintptr(TIOCSCTTY), 0)
		if err1 != 0 {
			goto childerror
		}
	}

	// Restore original rlimit.
	if rlim != nil {
		RawSyscall(SYS_SETRLIMIT, uintptr(RLIMIT_NOFILE), uintptr(unsafe.Pointer(rlim)), 0)
	}

	// Time to exec.
	_, _, err1 = RawSyscall(SYS_EXECVE,
		uintptr(unsafe.Pointer(argv0)),

	Isrss    int64
	Minflt   int64
	Majflt   int64
	Nswap    int64
	Inblock  int64
	Oublock  int64
	Msgsnd   int64
	Msgrcv   int64
	Nsignals int64
	Nvcsw    int64
	Nivcsw   int64
}

type Rlimit struct {
	Cur uint64
	Max uint64
}

type _Gid_t uint32

type Stat_t struct {
	Dev                uint64
	Ino                uint64
	Nlink              uint64
	Mode               uint32

	// Set the controlling TTY to Ctty
	if sys.Setctty {
		_, _, err1 = RawSyscall(SYS_IOCTL, uintptr(sys.Ctty), uintptr(TIOCSCTTY), 0)
		if err1 != 0 {
			goto childerror
		}
	}

	// Restore original rlimit.
	if rlim != nil {
		RawSyscall(SYS_SETRLIMIT, uintptr(RLIMIT_NOFILE), uintptr(unsafe.Pointer(rlim)), 0)
	}

	// Time to exec.
	_, _, err1 = RawSyscall(SYS_EXECVE,
		uintptr(unsafe.Pointer(argv0)),

	Isrss    int64
	Minflt   int64
	Majflt   int64
	Nswap    int64
	Inblock  int64
	Oublock  int64
	Msgsnd   int64
	Msgrcv   int64
	Nsignals int64
	Nvcsw    int64
	Nivcsw   int64
}

type Rlimit struct {
	Cur uint64
	Max uint64
}

type _Gid_t uint32

type Stat_t struct {
	Dev               uint64
	Ino               uint64
	Mode              uint32
	Nlink             uint32

	Isrss    int64
	Minflt   int64
	Majflt   int64
	Nswap    int64
	Inblock  int64
	Oublock  int64
	Msgsnd   int64
	Msgrcv   int64
	Nsignals int64
	Nvcsw    int64
	Nivcsw   int64
}

type Rlimit struct {
	Cur uint64
	Max uint64
}

type _Gid_t uint32

type Stat_t struct {
	Dev     uint32
	Pad1    [3]int32
	Ino     uint64
	Mode    uint32
	Nlink   uint32
	Uid     uint32

	SYS_SWAPCTL        = 193 // { int sys_swapctl(int cmd, const void *arg, int misc); }
	SYS_GETRLIMIT      = 194 // { int sys_getrlimit(int which, struct rlimit *rlp); }
	SYS_SETRLIMIT      = 195 // { int sys_setrlimit(int which, const struct rlimit *rlp); }
	SYS_MMAP           = 197 // { void *sys_mmap(void *addr, size_t len, int prot, int flags, int fd, long pad, off_t pos); }

	SYS_SWAPCTL        = 193 // { int sys_swapctl(int cmd, const void *arg, int misc); }
	SYS_GETRLIMIT      = 194 // { int sys_getrlimit(int which, struct rlimit *rlp); }
	SYS_SETRLIMIT      = 195 // { int sys_setrlimit(int which, const struct rlimit *rlp); }
	SYS_MMAP           = 197 // { void *sys_mmap(void *addr, size_t len, int prot, int flags, int fd, long pad, off_t pos); }

	Isrss    int32
	Minflt   int32
	Majflt   int32
	Nswap    int32
	Inblock  int32
	Oublock  int32
	Msgsnd   int32
	Msgrcv   int32
	Nsignals int32
	Nvcsw    int32
	Nivcsw   int32
}

type Rlimit struct {
	Cur uint64
	Max uint64
}

type _Gid_t uint32

type Stat_t struct {
	Mode    uint32
	Dev     int32
	Ino     uint64
	Nlink   uint32
	Uid     uint32
	Gid     uint32
	Rdev    int32

	Minflt   int64
	Majflt   int64
	Nswap    int64
	Inblock  int64
	Oublock  int64
	Msgsnd   int64
	Msgrcv   int64
	Nsignals int64
	Nvcsw    int64
	Nivcsw   int64
}

type Rlimit struct {
	Cur uint64
	Max uint64
}

// { int, short, short } in poll.h
type PollFd struct {
	Fd      int32
	Events  int16
	Revents int16
}

type Stat_t struct { //Linux Definition

	SYS_SWAPCTL        = 193 // { int sys_swapctl(int cmd, const void *arg, int misc); }
	SYS_GETRLIMIT      = 194 // { int sys_getrlimit(int which, struct rlimit *rlp); }
	SYS_SETRLIMIT      = 195 // { int sys_setrlimit(int which, const struct rlimit *rlp); }
	SYS_MMAP           = 197 // { void *sys_mmap(void *addr, size_t len, int prot, int flags, int fd, long pad, off_t pos); }