Function sysctl_kern_console

freebsd/kern/kern_cons.c:316–365

* sysctl_kern_console() provides output parseable in conscontrol(1). */

 * sysctl_kern_console() provides output parseable in conscontrol(1).
 */
static int
sysctl_kern_console(SYSCTL_HANDLER_ARGS)
{
	struct cn_device *cnd;
	struct consdev *cp, **list;
	char *p;
	int delete, error;
	struct sbuf *sb;

	sb = sbuf_new(NULL, NULL, CNDEVPATHMAX * 2, SBUF_AUTOEXTEND |
	    SBUF_INCLUDENUL);
	if (sb == NULL)
		return (ENOMEM);
	sbuf_clear(sb);
	STAILQ_FOREACH(cnd, &cn_devlist, cnd_next)
		sbuf_printf(sb, "%s,", cnd->cnd_cn->cn_name);
	sbuf_printf(sb, "/");
	SET_FOREACH(list, cons_set) {
		cp = *list;
		if (cp->cn_name[0] != '\0')
			sbuf_printf(sb, "%s,", cp->cn_name);
	}
	sbuf_finish(sb);
	error = sysctl_handle_string(oidp, sbuf_data(sb), sbuf_len(sb), req);
	if (error == 0 && req->newptr != NULL) {
		p = sbuf_data(sb);
		error = ENXIO;
		delete = 0;
		if (*p == '-') {
			delete = 1;
			p++;
		}
		SET_FOREACH(list, cons_set) {
			cp = *list;
			if (strcmp(p, cp->cn_name) != 0)
				continue;
			if (delete) {
				cnremove(cp);
				error = 0;
			} else {
				error = cnadd(cp);
				if (error == 0)
					cnselect(cp);
			}
			break;
		}
	}
	sbuf_delete(sb);
	return (error);
}

SYSCTL_PROC(_kern, OID_AUTO, console,
    CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_NEEDGIANT, 0, 0,