Index: sys/compat/linprocfs/linprocfs.c
===================================================================
--- sys/compat/linprocfs/linprocfs.c
+++ sys/compat/linprocfs/linprocfs.c
@@ -767,6 +767,40 @@
 	return (0);
 }
 
+static int
+linprocfs_get_tty_nr(struct proc *p)
+{
+	struct session *sp;
+	struct tty *tp;
+	const char *ttyname;
+	int error, major, minor, nr;
+
+	sx_assert(&proctree_lock, SX_LOCKED);
+
+	if ((p->p_flag & P_CONTROLT) == 0)
+		return (-1);
+
+	sp = p->p_pgrp->pg_session;
+	if (sp == NULL)
+		return (-1);
+
+	tp = sp->s_ttyp;
+
+	//printf("%s: tp->t_dev = %p\n", __func__, tp->t_dev);
+	ttyname = devtoname(tp->t_dev);
+
+	//printf("%s: ttyname = %s\n", __func__, ttyname);
+	error = linux_driver_get_major_minor(ttyname, &major, &minor);
+	//printf("%s: error = %d, major = %d, minor = %d\n", __func__, error, major, minor);
+	if (error != 0)
+		return (-1);
+
+	nr = makedev(major, minor);
+	//printf("%s: nr = %d <%#x>\n", __func__, nr, nr);
+
+	return (nr);
+}
+
 /*
  * Filler function for proc/pid/stat
  */
@@ -777,12 +811,14 @@
 	struct timeval boottime;
 	char state;
 	static int ratelimit = 0;
+	int tty_nr;
 	vm_offset_t startcode, startdata;
 
 	getboottime(&boottime);
 	sx_slock(&proctree_lock);
 	PROC_LOCK(p);
 	fill_kinfo_proc(p, &kp);
+	tty_nr = linprocfs_get_tty_nr(p);
 	sx_sunlock(&proctree_lock);
 	if (p->p_vmspace) {
 	   startcode = (vm_offset_t)p->p_vmspace->vm_taddr;
@@ -809,10 +845,7 @@
 	PS_ADD("pgrp",		"%d",	p->p_pgid);
 	PS_ADD("session",	"%d",	p->p_session->s_sid);
 	PROC_UNLOCK(p);
-	if (kp.ki_tdev == NODEV)
-		PS_ADD("tty",	"%s",	"-1");
-	else
-		PS_ADD("tty",		"%ju",	(uintmax_t)kp.ki_tdev);
+	PS_ADD("tty",		"%d",	tty_nr);
 	PS_ADD("tpgid",		"%d",	kp.ki_tpgid);
 	PS_ADD("flags",		"%u",	0); /* XXX */
 	PS_ADD("minflt",	"%lu",	kp.ki_rusage.ru_minflt);
@@ -825,8 +858,8 @@
 	PS_ADD("cstime",	"%ld",	TV2J(&kp.ki_rusage_ch.ru_stime));
 	PS_ADD("priority",	"%d",	kp.ki_pri.pri_user);
 	PS_ADD("nice",		"%d",	kp.ki_nice); /* 19 (nicest) to -19 */
-	PS_ADD("0",		"%d",	0); /* removed field */
-	PS_ADD("itrealvalue",	"%d",	0); /* XXX */
+	PS_ADD("0",		"%d",	0); /* removed field */ // XXX: num_threads
+	PS_ADD("itrealvalue",	"%d",	0);
 	PS_ADD("starttime",	"%lu",	TV2J(&kp.ki_start) - TV2J(&boottime));
 	PS_ADD("vsize",		"%ju",	P2K((uintmax_t)kp.ki_size));
 	PS_ADD("rss",		"%ju",	(uintmax_t)kp.ki_rssize);
@@ -847,6 +880,7 @@
 	PS_ADD("processor",	"%u",	kp.ki_lastcpu);
 	PS_ADD("rt_priority",	"%u",	0); /* XXX */ /* >= 2.5.19 */
 	PS_ADD("policy",	"%u",	kp.ki_pri.pri_class); /* >= 2.5.19 */
+	// XXX: more stuff missing
 #undef PS_ADD
 	sbuf_putc(sb, '\n');
 
@@ -1391,6 +1425,19 @@
 }
 
 /*
+ * Filler function for proc/sys/kernel/ngroups_max
+ * XXX: truss id
+ * XXX: porównać z ubuntu
+ */
+static int
+linprocfs_dongroups_max(PFS_FILL_ARGS)
+{
+
+	sbuf_printf(sb, "%d\n", NGROUPS);
+	return (0);
+}
+
+/*
  * Filler function for proc/sys/kernel/pid_max
  */
 static int
@@ -1812,6 +1859,7 @@
 
 	/* /proc/sys/... */
 	sys = pfs_create_dir(root, "sys", NULL, NULL, NULL, 0);
+
 	/* /proc/sys/kernel/... */
 	dir = pfs_create_dir(sys, "kernel", NULL, NULL, NULL, 0);
 	pfs_create_file(dir, "osrelease", &linprocfs_doosrelease,
@@ -1821,6 +1869,8 @@
 	pfs_create_file(dir, "version", &linprocfs_doosbuild,
 	    NULL, NULL, NULL, PFS_RD);
 	pfs_create_file(dir, "msgmni", &linprocfs_domsgmni,
+	    NULL, NULL, NULL, PFS_RD);
+	pfs_create_file(dir, "ngroups_max", &linprocfs_dongroups_max,
 	    NULL, NULL, NULL, PFS_RD);
 	pfs_create_file(dir, "pid_max", &linprocfs_dopid_max,
 	    NULL, NULL, NULL, PFS_RD);