Synchronize on NetBSD-CVS (2013/12/1 12:00:00 UTC)

- Fix for possible unset uid/gid in toproto
 - Fix for default mtree style
 - Update libelf
 - Importing libexecinfo
 - Resynchronize GCC, mpc, gmp, mpfr
 - build.sh: Replace params with show-params.
     This has been done as the make target has been renamed in the same
     way, while a new target named params has been added. This new
     target generates a file containing all the parameters, instead of
     printing it on the console.
 - Update test48 with new etc/services (Fix by Ben Gras <ben@minix3.org)
     get getservbyport() out of the inner loop

Change-Id: Ie6ad5226fa2621ff9f0dee8782ea48f9443d2091

lib/libc/string/memset.3

@@ -30,9 +30,9 @@
 .\" SUCH DAMAGE.
 .\"
 .\"     from: @(#)memset.3	8.1 (Berkeley) 6/4/93
-.\"	$NetBSD: memset.3,v 1.9 2003/08/07 16:43:49 agc Exp $
+.\"	$NetBSD: memset.3,v 1.12 2013/06/24 07:56:49 wiz Exp $
 .\"
-.Dd June 4, 1993
+.Dd June 23, 2013
 .Dt MEMSET 3
 .Os
 .Sh NAME
@@ -60,8 +60,17 @@ The
 function
 returns the original value of
 .Fa b .
+.Pp
+Note that the compiler may optimize away a call to
+.Fn memset
+if it can prove that the string will not be used by the program again,
+for example if it is allocated on the stack and about to out of scope.
+If you want to guarantee that zeros are written to memory, for example
+to sanitize a buffer holding a cryptographic secret, use
+.Xr explicit_memset 3 .
 .Sh SEE ALSO
 .Xr bzero 3 ,
+.Xr explicit_memset 3 ,
 .Xr swab 3
 .Sh STANDARDS
 The