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
			}
		}
	}

	SYS_FPATHCONF                = 192 // { int fpathconf(int fd, int name); }
	SYS_GETRLIMIT                = 194 // { int getrlimit(u_int which, \
	SYS_SETRLIMIT                = 195 // { int setrlimit(u_int which, \
	SYS_FREEBSD6_MMAP            = 197 // { caddr_t freebsd6_mmap(caddr_t addr, \
	SYS_FREEBSD6_LSEEK           = 199 // { off_t freebsd6_lseek(int fd, int pad, \

	for i := range iov {
		if iov[i].Len > 0 {
			return false
		}
	}
	return true
}

// Setrlimit sets a resource limit.
func Setrlimit(resource int, rlim *Rlimit) error {
	// Just call the syscall version, because as of Go 1.21
	// it will affect starting a new process.
	return syscall.Setrlimit(resource, (*syscall.Rlimit)(rlim))

	SYS_FPATHCONF                = 192 // { int fpathconf(int fd, int name); }
	SYS_GETRLIMIT                = 194 // { int getrlimit(u_int which, \
	SYS_SETRLIMIT                = 195 // { int setrlimit(u_int which, \
	SYS_FREEBSD6_MMAP            = 197 // { caddr_t freebsd6_mmap(caddr_t addr, \
	SYS_FREEBSD6_LSEEK           = 199 // { off_t freebsd6_lseek(int fd, int pad, \

//go:cgo_import_dynamic libc_Setpriority setpriority "libc.so"
//go:cgo_import_dynamic libc_Setregid setregid "libc.so"
//go:cgo_import_dynamic libc_Setreuid setreuid "libc.so"
//go:cgo_import_dynamic libc_setrlimit setrlimit "libc.so"
//go:cgo_import_dynamic libc_Setsid setsid "libc.so"
//go:cgo_import_dynamic libc_Setuid setuid "libc.so"
//go:cgo_import_dynamic libc_shutdown shutdown "libsocket.so"
//go:cgo_import_dynamic libc_Stat stat "libc.so"

//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	setrlimit(which int, lim *Rlimit) (err error)
//sysnb	Setsid() (pid int, err error)
//sysnb	Setuid(uid int) (err error)
//sys	Shutdown(s int, how int) (err error) = libsocket.shutdown
//sys	Stat(path string, stat *Stat_t) (err error)

	SYS_FPATHCONF                = 192 // { int fpathconf(int fd, int name); }
	SYS_GETRLIMIT                = 194 // { int getrlimit(u_int which, \
	SYS_SETRLIMIT                = 195 // { int setrlimit(u_int which, \
	SYS_FREEBSD6_MMAP            = 197 // { caddr_t freebsd6_mmap(caddr_t addr, \
	SYS_FREEBSD6_LSEEK           = 199 // { off_t freebsd6_lseek(int fd, int pad, \

	SYS_PATHCONF      = 191 // { int pathconf(char *path, int name); }
	SYS_FPATHCONF     = 192 // { int fpathconf(int fd, int name); }
	SYS_GETRLIMIT     = 194 // { int getrlimit(u_int which, \
	SYS_SETRLIMIT     = 195 // { int setrlimit(u_int which, \
	SYS_MMAP          = 197 // { caddr_t mmap(caddr_t addr, size_t len, int prot, \
	// SYS_NOSYS = 198;  // { int nosys(void); } __syscall __syscall_args int

//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	setrlimit(which int, lim *Rlimit) (err error)
//sys	Stat(path string, stat *Stat_t) (err error)
//sys	Statfs(path string, buf *Statfs_t) (err error)
//sys	Symlink(path string, link string) (err error)

func setrlimit(which int, lim *Rlimit) (err error) {
	_, _, e1 := rawSyscall(abi.FuncPCABI0(libc_setrlimit_trampoline), uintptr(which), uintptr(unsafe.Pointer(lim)), 0)
	if e1 != 0 {
		err = errnoErr(e1)
	}
	return
}

func libc_setrlimit_trampoline()

//go:cgo_import_dynamic libc_setrlimit setrlimit "libc.so"