lockf.1: Organize and provide error numbers

Add error numbers to the exit codes so that readers can decode them
without having to use a separate utility. Organize exits by error code.
Mark up the error constants with the error constant macro, even though
this is really not very helpful because people will search for the error
code, the macro is explicitly for the constants and not the codes.

While where, align and alphabetize the options list as well, fix
misaligned padding in an example, and a one-sentance-per-line error.

MFC after:		3 days
Reported by:		Antranig Vartanian <antranigv@freebsd.am>
Differential Revision:	https://reviews.freebsd.org/D48470

usr.bin/lockf/lockf.1

@@ -1,4 +1,6 @@
 .\"
+.\" SPDX-License-Identifier: BSD-2-Clause
+.\"
 .\" Copyright (C) 1998 John D. Polstra.  All rights reserved.
 .\"
 .\" Redistribution and use in source and binary forms, with or without
@@ -22,7 +24,7 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.Dd June 24, 2025
+.Dd February 26, 2026
 .Dt LOCKF 1
 .Os
 .Sh NAME
@@ -104,15 +106,10 @@ that if the
 option is not used, then no guarantees around lock ordering can be made.
 .Pp
 The following options are supported:
-.Bl -tag -width ".Fl t Ar seconds"
+.Bl -tag -width "-t seconds"
 .It Fl k
 Causes the lock file to be kept (not removed) after the command
 completes.
-.It Fl s
-Causes
-.Nm
-to operate silently.
-Failure to acquire the lock is indicated only in the exit status.
 .It Fl n
 Causes
 .Nm
@@ -136,6 +133,11 @@ This option will cause
 to open
 .Ar file
 for writing rather than reading.
+.It Fl s
+Causes
+.Nm
+to operate silently.
+Failure to acquire the lock is indicated only in the exit status.
 .It Fl T
 Upon receipt of a
 .Dv SIGTERM ,
@@ -191,32 +193,32 @@ successfully acquires the lock, it returns the exit status produced by
 Otherwise, it returns one of the exit codes defined in
 .Xr sysexits 3 ,
 as follows:
-.Bl -tag -width ".Dv EX_CANTCREAT"
-.It Dv EX_TEMPFAIL
-The specified lock file was already locked by another process.
-.It Dv EX_CANTCREAT
+.Bl -tag -width "EX_UNAVAILABLE (69)"
+.It Er EX_OSERR Pq 61
+A system call, e.g.,
+.Xr fork 2 ,
+failed unexpectedly.
+.It Er EX_USAGE Pq 64
+There was an error on the
+.Nm
+command line.
+.It Er EX_UNAVAILABLE Pq 69
+The
+.Fl n
+option is specified and the specified lock file does not exist.
+.It Er EX_SOFTWARE Pq 70
+The
+.Ar command
+did not exit normally,
+but may have been signaled or stopped.
+.It Er EX_CANTCREAT Pq 73
 The
 .Nm
 utility
 was unable to create the lock file, e.g., because of insufficient access
 privileges.
-.It Dv EX_UNAVAILABLE
-The
-.Fl n
-option is specified and the specified lock file does not exist.
-.It Dv EX_USAGE
-There was an error on the
-.Nm
-command line.
-.It Dv EX_OSERR
-A system call (e.g.,
-.Xr fork 2 )
-failed unexpectedly.
-.It Dv EX_SOFTWARE
-The
-.Ar command
-did not exit normally,
-but may have been signaled or stopped.
+.It Er EX_TEMPFAIL Pq 75
+The specified lock file was already locked by another process.
 .El
 .Sh EXAMPLES
 The first job takes a lock and sleeps for 5 seconds in the background.
@@ -237,9 +239,10 @@ $ lockf mylock sleep 1 & lockf -t 5 mylock echo "Success"
 Success
 [1]+  Done                    lockf mylock sleep 1
 .Ed
+.Pp
 Lock a file and run a script, return immediately if the lock is not
-available. Do not delete the file afterward so lock order is
-guaranteed.
+available.
+Do not delete the file afterward so lock order is guaranteed.
 .Pp
 .Dl $ lockf -t 0 -k /tmp/my.lock myscript
 .Pp