Lockf was exiting with status 1 if the command did not exit normally.

This is easy to confuse with the actual exit status of the program.
Instead exit with EX_SOFTWARE if the command doesn't exit normally.

MFC after:	1 month

usr.bin/lockf/lockf.1

@@ -138,6 +138,11 @@ command line.
 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.
 .El
 .Sh SEE ALSO
 .Xr flock 2 ,

usr.bin/lockf/lockf.c

@@ -151,7 +151,7 @@ main(int argc, char **argv)
 	signal(SIGTERM, killed);
 	if (waitpid(child, &status, 0) == -1)
 		err(EX_OSERR, "waitpid failed");
-	return (WIFEXITED(status) ? WEXITSTATUS(status) : 1);
+	return (WIFEXITED(status) ? WEXITSTATUS(status) : EX_SOFTWARE);
 }
 
 /*