_exit.2: Cross-reference atexit(3)

atexit(3) is one of the cases when _exit(2) must be used instead of
exit(3).

MFC after:		3 days
Reviewed by:		mhorne, ziaee
Differential Revision:	https://reviews.freebsd.org/D54467

lib/libc/stdlib/atexit.3

@@ -29,7 +29,7 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.Dd September 6, 2002
+.Dd March 31, 2026
 .Dt ATEXIT 3
 .Os
 .Sh NAME
@@ -90,6 +90,7 @@ function was called by a program that did not supply a
 implementation.
 .El
 .Sh SEE ALSO
+.Xr _exit 2 ,
 .Xr at_quick_exit 3 ,
 .Xr exit 3
 .Sh STANDARDS

lib/libsys/_exit.2

@@ -25,7 +25,7 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.Dd September 8, 2016
+.Dd March 31, 2026
 .Dt EXIT 2
 .Os
 .Sh NAME
@@ -95,9 +95,9 @@ and all current access to the controlling terminal is revoked.
 .Pp
 Most C programs call the library routine
 .Xr exit 3 ,
-which flushes buffers, closes streams, unlinks temporary files, etc.,
-before
-calling
+which flushes buffers, closes streams, unlinks temporary files, invokes
+.Xr atexit 3
+handlers, etc., before calling
 .Fn _exit .
 .Sh RETURN VALUES
 The
@@ -108,6 +108,7 @@ can never return.
 .Xr fork 2 ,
 .Xr sigaction 2 ,
 .Xr wait 2 ,
+.Xr atexit 3 ,
 .Xr exit 3 ,
 .Xr init 8
 .Sh STANDARDS