Reference the sysctl variables related to various limits.

PR:		docs/6764

usr.bin/limits/limits.1

@@ -17,7 +17,7 @@
 .\" 5. Modifications may be freely made to this file providing the above
 .\"    conditions are met.
 .\"
-.\"	$Id: limits.1,v 1.8 1998/06/04 21:05:58 steve Exp $
+.\"	$Id: limits.1,v 1.9 1999/02/12 02:12:06 alex Exp $
 .\"
 .Dd January 15, 1996
 .Dt LIMITS 1
@@ -196,7 +196,11 @@ size limit.
 .It Fl n Op Ar limit
 Selects or sets the
 .Em openfiles
-resource limit.
+resource limit.  The system-wide limit on the maximum number of
+open files per process can be viewed using the 'sysctl kern.maxfilesperproc'
+command.  The total number of simultaneously open files in the entire
+system is limited to the value displayed by the 'sysctl kern.maxfiles'
+command.
 .It Fl s Op Ar limit
 Selects or sets the
 .Em stacksize
@@ -208,7 +212,11 @@ resource limit.
 .It Fl u Op Ar limit
 Selects or sets the
 .Em maxproc
-resource limit.
+resource limit.  The system-wide limit on the maximum number of processes
+allowed per UID can be viewed using the 'sysctl kern.maxprocperuid' command.
+The maximum number of processes that can be running simultaneously
+in the entire system is limited to the value given by
+the 'sysctl kern.maxproc' command.
 .Pp
 Valid values for 'limit' in the above set of flags consist of either the
 string 'infinity' or 'inf' for an infinite (or kernel-defined maximum)
@@ -292,7 +300,8 @@ will be whatever the executed program returns.
 .Xr getrlimit 2 ,
 .Xr setrlimit 2 ,
 .Xr login_cap 3 ,
-.Xr login.conf 5
+.Xr login.conf 5 ,
+.Xr sysctl 8
 .Sh BUGS
 .Nm Limits
 does not handle commands with equal (``='') signs in their