Add a quick description of sysctlbyname() and link sysctl.3 to

sysctlbyname.3

lib/libc/gen/Makefile.inc

@@ -1,5 +1,5 @@
 #	@(#)Makefile.inc	8.6 (Berkeley) 5/4/95
-#	$Id: Makefile.inc,v 1.35 1997/06/14 01:15:41 ache Exp $
+#	$Id: Makefile.inc,v 1.36 1997/06/25 08:05:02 msmith Exp $
 
 # machine-independent gen sources
 .PATH: ${.CURDIR}/../libc/${MACHINE}/gen ${.CURDIR}/../libc/gen
@@ -114,6 +114,7 @@ MLINKS+=setmode.3 getmode.3
 MLINKS+=sigsetops.3 sigemptyset.3 sigsetops.3 sigfillset.3 \
 	sigsetops.3 sigaddset.3 sigsetops.3 sigdelset.3 \
 	sigsetops.3 sigismember.3
+MLINKS+=sysctl.3 sysctlbyname.3
 MLINKS+=syslog.3 closelog.3 syslog.3 openlog.3 syslog.3 setlogmask.3 \
 	syslog.3 vsyslog.3
 MLINKS+=tcsendbreak.3 tcdrain.3 tcsendbreak.3 tcflush.3 tcsendbreak.3 tcflow.3

lib/libc/gen/sysctl.3

@@ -35,13 +35,15 @@
 .Dt SYSCTL 3
 .Os
 .Sh NAME
-.Nm sysctl
+.Nm sysctl ,
+.Nm sysctlbyname
 .Nd get or set system information
 .Sh SYNOPSIS
 .Fd #include <sys/types.h>
 .Fd #include <sys/sysctl.h>
 .Ft int
 .Fn sysctl "int *name" "u_int namelen" "void *oldp" "size_t *oldlenp" "void *newp" "size_t newlen"
+.Fn sysctlbyname "const char *name" "void *oldp" "size_t *oldlenp" "void *newp" "size_t newlen"
 .Sh DESCRIPTION
 The
 .Fn sysctl
@@ -71,6 +73,14 @@ which is a
 .Fa namelen
 length array of integers.
 .Pp
+The
+.Fn sysctlbyname
+function accepts an ascii representation of the name and internally
+looks up the integer name vector.  Apart from that, it behaves the same
+as the standard
+.Fn sysctl
+function.
+.Pp
 The information is copied into the buffer specified by
 .Fa oldp .
 The size of the buffer is given by the location specified by