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diff --git a/contrib/sendmail/include/sm/shm.h b/contrib/sendmail/include/sm/shm.h
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+/*
+ * Copyright (c) 2000-2001 Sendmail, Inc. and its suppliers.
+ * All rights reserved.
+ *
+ * By using this file, you agree to the terms and conditions set
+ * forth in the LICENSE file which can be found at the top level of
+ * the sendmail distribution.
+ *
+ * $Id: shm.h,v 1.7 2001/04/20 15:21:55 ca Exp $
+ */
+
+#ifndef SM_SHM_H
+# define SM_SHM_H
+
+# if SM_CONF_SHM
+# include <sys/types.h>
+# include <sys/ipc.h>
+# include <sys/shm.h>
+
+/* # include "def.h" */
+
+/* key for shared memory */
+# define SM_SHM_KEY ((key_t) 42)
+
+/* return value for failed shmget() */
+# define SM_SHM_NULL ((void *) -1)
+# define SM_SHM_NO_ID (-1)
+# define SM_NO_SHM(id) ((id) < 0)
+
+extern void *sm_shmstart __P((key_t, int , int , int *, bool));
+extern int sm_shmstop __P((void *, int, bool));
+
+/* for those braindead systems... (e.g., SunOS 4) */
+# ifndef SHM_R
+# define SHM_R 0400
+# endif /* SHM_R */
+# ifndef SHM_W
+# define SHM_W 0200
+# endif /* SHM_W */
+
+# endif /* SM_CONF_SHM */
+#endif /* ! SM_SHM_H */
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