func _C_getpwnam_r(name *_C_char, buf *_C_char, size _C_size_t) (pwd _C_struct_passwd, found bool, errno syscall.Errno) {
	var result *_C_struct_passwd
	errno = unix.Getpwnam(name, &pwd, buf, size, &result)
	return pwd, result != nil, errno
}

func _C_getpwuid_r(uid _C_uid_t, buf *_C_char, size _C_size_t) (pwd _C_struct_passwd, found bool, errno syscall.Errno) {
	var result *_C_struct_passwd

func _C_GoString(p *_C_char) string { return C.GoString(p) }

func _C_getpwnam_r(name *_C_char, buf *_C_char, size _C_size_t) (pwd _C_struct_passwd, found bool, errno syscall.Errno) {
	var f, e _C_int
	pwd = C.mygetpwnam_r(name, buf, size, &f, &e)
	return pwd, f != 0, syscall.Errno(e)
}

func _C_getpwuid_r(uid _C_uid_t, buf *_C_char, size _C_size_t) (pwd _C_struct_passwd, found bool, errno syscall.Errno) {
	var f, e _C_int

	err := retryWithBuffer(userBuffer, func(buf []byte) syscall.Errno {
		var errno syscall.Errno
		pwd, found, errno = _C_getpwnam_r((*_C_char)(unsafe.Pointer(&nameC[0])),
			(*_C_char)(unsafe.Pointer(&buf[0])), _C_size_t(len(buf)))
		return errno
	})
	if err == syscall.ENOENT || (err == nil && !found) {
		return nil, UnknownUserError(username)
	}
	if err != nil {
		return nil, fmt.Errorf("user: lookup username %s: %v", username, err)