setNproc = false
	case "aix":
		nproc = 9
	case "linux":
		nproc = 6
	case "darwin", "dragonfly", "freebsd", "netbsd", "openbsd":
		nproc = 7
	}
	if setNproc {
		var rlim syscall.Rlimit
		if syscall.Getrlimit(nproc, &rlim) == nil {
			max := int(rlim.Cur) / (threads + 5)
			if attempts > max {
				t.Logf("lowering attempts from %d to %d for RLIMIT_NPROC", attempts, max)
				attempts = max
			}
		}
	}

TEXT ·RawSyscall6(SB),NOSPLIT,$0
	JMP	runtime·syscall_rawsyscall6(SB)

TEXT ·setgid(SB),NOSPLIT,$0
	JMP	runtime·syscall_setgid(SB)

TEXT ·setgroups1(SB),NOSPLIT,$0
	JMP	runtime·syscall_setgroups(SB)

TEXT ·setrlimit1(SB),NOSPLIT,$0
	JMP	runtime·syscall_setrlimit(SB)

TEXT ·setsid(SB),NOSPLIT,$0
	JMP	runtime·syscall_setsid(SB)

TEXT ·setuid(SB),NOSPLIT,$0
	JMP	runtime·syscall_setuid(SB)

TEXT ·setpgid(SB),NOSPLIT,$0

pkg syscall (darwin-386), func Getpgid(int) (int, error)
pkg syscall (darwin-386), func Getpgrp() int
pkg syscall (darwin-386), func Getpriority(int, int) (int, error)
pkg syscall (darwin-386), func Getrlimit(int, *Rlimit) error
pkg syscall (darwin-386), func Getrusage(int, *Rusage) error
pkg syscall (darwin-386), func Getsid(int) (int, error)
pkg syscall (darwin-386), func Getsockname(int) (Sockaddr, 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	Lchown(path string, uid int, gid int) (err error)
//sys	Listen(s int, n int) (err error)
//sys	Lstat(path string, stat *Stat_t) (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) = SYS_UGETRLIMIT
//sysnb	Getuid() (uid int)
//sys	Ioperm(from int, num int, on int) (err error)
//sys	Iopl(level int) (err error)
//sys	Lchown(path string, uid int, gid int) (err error)

func getpid() (pid uintptr, err Errno)
func ioctl(fd uintptr, req uintptr, arg uintptr) (err Errno)
func setgid(gid uintptr) (err Errno)
func setgroups1(ngid uintptr, gid uintptr) (err Errno)
func setrlimit1(which uintptr, lim unsafe.Pointer) (err Errno)
func setsid() (pid uintptr, err Errno)
func setuid(uid uintptr) (err Errno)
func setpgid(pid uintptr, pgid uintptr) (err Errno)

//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	Ioperm(from int, num int, on int) (err error)
//sys	Iopl(level int) (err error)
//sys	Lchown(path string, 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	Getrlimit(resource int, rlim *Rlimit) (err error)
//sysnb	Getuid() (uid int)
//sys	Listen(s int, n int) (err error)
//sys	MemfdSecret(flags int) (fd 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	Lchown(path string, uid int, gid int) (err error)
//sys	Listen(s int, n int) (err error)
//sys	Pause() (err error)

pkg syscall (netbsd-arm64-cgo), func Getpgid(int) (int, error)
pkg syscall (netbsd-arm64-cgo), func Getpgrp() int
pkg syscall (netbsd-arm64-cgo), func Getpriority(int, int) (int, error)
pkg syscall (netbsd-arm64-cgo), func Getrlimit(int, *Rlimit) error
pkg syscall (netbsd-arm64-cgo), func Getrusage(int, *Rusage) error
pkg syscall (netbsd-arm64-cgo), func Getsid(int) (int, error)
pkg syscall (netbsd-arm64-cgo), func Getsockname(int) (Sockaddr, error)