Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Copy head to stable/9 as part of 9.0-RELEASE release cycle.

Approved by: re (implicit)

Add arc4random_uniform() function (to avoid "modulo bias")

Obtained from: OpenBSD

Implement arc4random_buf() function

Obtained from: OpenBSD

The upper end of the range of arc4random(3) is 2**32-1, not 2**31-1.

Assorted mdoc(7) fixes.

Approved by: re (blanket)

Use the .Dl macro.

Discussed with: mdoc(7) officer ru

State the fact that the range is twice the traditional RAND_MAX.
Add an EXAMPLES section.

PR: 48493
Submitted by: Paul Herman <pherman@frenchfries.net> (original version)

mdoc(7) police: Use the new .In macro for #include statements.

mdoc(7) police: normalize .Nd.

Whitespace only change: trim trailing whitespace.

Introduce ".Lb" macro to libc manpages.

More libraries manpages updates following.

Remove single-space hard sentence breaks. These degrade the quality
of the typeset output, tend to make diffs harder to read and provide
bad examples for new-comers to mdoc.

mdoc(7)'fy

$Id$ -> $FreeBSD$

Add $Id$, to make it simpler for members of the translation teams to
track.

The $Id$ line is normally at the bottom of the main comment block in the
man page, separated from the rest of the manpage by an empty comment,
like so;

.\" $Id$
.\"

If the immediately preceding comment is a @(#) format ID marker than the
the $Id$ will line up underneath it with no intervening blank lines.
Otherwise, an additional blank line is inserted.

Approved by: bde

More typos.

Typo.

Obtained from: OpenBSD

Change u_char which require special include to unsigned char

Add arc4random() functions from OpenBSD. They are almost same as our
srandomdev(), but can be used inside libraries. random() can't be used
inside libraries because it breaks its possible predictable sequence.
arc4random() is true random as designed, so its usage is library-safe.
Obtained from: OpenBSD