exit(3): clarify how to obtain full exit status of the exited process

(cherry picked from commit c4269e63ecf301306a6176b9fe9002c4c2265695)

exit(3): make it thread-safe

(cherry picked from commit 3f3ec4b99f79d32a0bf15495559ca9883bd751f2)

Remove $FreeBSD$: one-line nroff pattern

Remove /^\.\\"\s*\$FreeBSD\$$\n/

_Exit(3): document implementation

Remove a useless note about unlinking temporary files, they are unlinked
in tmpfile(3) [1]. Add a note about __cxa_atexit().

Explain exactly what are the FreeBSD

_Exit(3): document implementation

Remove a useless note about unlinking temporary files, they are unlinked
in tmpfile(3) [1]. Add a note about __cxa_atexit().

Explain exactly what are the FreeBSD implementation differences between
exit() and _Exit().

Noted by: markj [1]
Reviewed by: emaste, markj
Sponsored by: The FreeBSD Foundation
MFC after: 3 days
Differential revision: https://reviews.freebsd.org/D31425

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exit(3): Add HISTORY section

PR: 240259
Submitted by: Gordon Bergling
Obtained from: OpenBSD
Differential Revision: https://reviews.freebsd.org/D24146

Bump the date on man pages in r334306

It seems a shame to ruin the patina of the June 4, 1993 date
on abort.3, especially since it still matched the date of
the SCCS ID, but those are the rules.

Re

Bump the date on man pages in r334306

It seems a shame to ruin the patina of the June 4, 1993 date
on abort.3, especially since it still matched the date of
the SCCS ID, but those are the rules.

Reported by: araujo
MFC after: 3 days
Sponsored by: Dell EMC

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Cross-reference abort2(2) from a few man pages

I didn't know abort2 existed until it was mentioned on a mailing list.
Mention it in related pages so others can find it easily.

MFC after: 3 days
Spo

Cross-reference abort2(2) from a few man pages

I didn't know abort2 existed until it was mentioned on a mailing list.
Mention it in related pages so others can find it easily.

MFC after: 3 days
Sponsored by: Dell EMC

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Various mdoc fixes and a few EOL whitespace removals.

Found with: mandoc -Tlint

Renumber clauses to reduce diffs to other versions

NetBSD, OpenBSD, and Android's Bionic number the clauses 1 through 3,
so follow suit to make comparison easier.

Implement quick_exit() / at_quick_exit() from C++11 / C1x. Also add a
__noreturn macro and modify the other exiting functions to use it.

The __noreturn macro, unlike __dead2, must be used BEFORE th

Implement quick_exit() / at_quick_exit() from C++11 / C1x. Also add a
__noreturn macro and modify the other exiting functions to use it.

The __noreturn macro, unlike __dead2, must be used BEFORE the function.
This is in line with the C and C++ specifications that place _Noreturn (c1x)
and [[noreturn]] (C++11) in front of the functions. As with __dead2, this
macro falls back to using the GCC attribute.

Unfortunately, clang currently sets the same value for the C version macro
in C99 and C1x modes, so these functions are hidden by default. At some
point before 10.0, I need to go through the headers and clean up the C1x /
C++11 visibility.

Reviewed by: brooks (mentor)

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Per Regents of the University of Calfornia letter, remove advertising
clause.

# If I've done so improperly on a file, please let me know.

Sort SEE ALSO references (in dictionary order, ignoring case).

Get rid of duplicates.

mdoc(7) police: sort xrefs in SEE ALSO.

Implement C99's _Exit() interface.
Implement a version of qsort that provides a thunk to the comparison function.

Update manual pages.

Include some verbage about not calling exit() from functions registered
by atexit().

Move to using .In instead of .Fd #include <> for include mark-up.

Inspired by comment from: dd

Remove whitespace at EOL.

.St -ansiC -> .St -isoC

Introduce ".Lb" macro to libc manpages.

More libraries manpages updates following.

$Id$ -> $FreeBSD$

Mention that EXIT_SUCCESS and EXIT_FAILURE are preferred over
sysexits.h-values as exit codes for portable programs.

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

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

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Sort cross references.

Xref sysexits(3).