locking.c: Use shell convention to report child killed by a signal.

diff --git a/locking.c b/locking.c
index b358a59a5db2c55409b1e3cb79528f88f9b4f220..e7acb6c18af783ab9d622448fa43d8788de0e75f 100644 (file)
--- a/locking.c
+++ b/locking.c
@@ -214,7 +214,7 @@ doneopts:
   fcntl(fd, F_SETLK, &l);
   close(fd);
   if (WIFEXITED(rc)) exit(WEXITSTATUS(rc));
-  else exit(255);
+  else exit(128 + WTERMSIG(rc));
 }
 
 /*----- That's all, folks -------------------------------------------------*/