var cgo_libc_setgroups unsafe.Pointer // non-nil if cgo linked.

func Setgroups(gids []int) (err error) {
	n := uintptr(len(gids))
	if n == 0 {
		if cgo_libc_setgroups == nil {
			if _, _, e1 := AllThreadsSyscall(_SYS_setgroups, 0, 0, 0); e1 != 0 {
				err = errnoErr(e1)
			}
			return
		}
		if ret := cgocaller(cgo_libc_setgroups, 0, 0); ret != 0 {
			err = errnoErr(Errno(ret))
		}
		return
	}

		if ngroups > 0 {
			groups = uintptr(unsafe.Pointer(&cred.Groups[0]))
		}
		if !(sys.GidMappings != nil && !sys.GidMappingsEnableSetgroups && ngroups == 0) && !cred.NoSetGroups {
			_, _, err1 = RawSyscall(_SYS_setgroups, ngroups, groups, 0)
			if err1 != 0 {
				goto childerror
			}
		}
		_, _, err1 = RawSyscall(sys_SETGID, uintptr(cred.Gid), 0, 0)
		if err1 != 0 {
			goto childerror
		}