_PATH_WALL
char buf[sizeof(_PATH_WALL) + sizeof(OPGRENT) + 3];
(void)snprintf(buf, sizeof(buf), "%s -g %s", _PATH_WALL, OPGRENT);
if (unveil(_PATH_WALL, "x") == -1)
err(1, "unveil %s", _PATH_WALL);
execle(_PATH_WALL, _PATH_WALL, "-n", (char *)NULL,
syslog(LOG_ERR, "%s: %m", _PATH_WALL);