xref: /illumos-gate/usr/src/cmd/sendmail/include/sm/sem.h (revision e9af4bc0)
1 /*
2  * Copyright (c) 2000-2001, 2005, 2008 Sendmail, Inc. and its suppliers.
3  *      All rights reserved.
4  *
5  * By using this file, you agree to the terms and conditions set
6  * forth in the LICENSE file which can be found at the top level of
7  * the sendmail distribution.
8  *
9  *	$Id: sem.h,v 1.10 2008/05/30 16:26:39 ca Exp $
10  */
11 
12 #ifndef SM_SEM_H
13 # define SM_SEM_H 1
14 
15 #include <sm/gen.h>
16 
17 /* key for semaphores */
18 # define SM_SEM_KEY	(41L)
19 # define SM_SEM_NO_ID	(-1)
20 # define SM_NO_SEM(id)	((id) < 0)
21 
22 # if SM_CONF_SEM > 0
23 #  include <sys/types.h>
24 #  include <sys/ipc.h>
25 #  include <sys/sem.h>
26 
27 # if SM_CONF_SEM == 2
28 union semun
29 {
30 	int		val;
31 	struct semid_ds	*buf;
32 	ushort		*array;
33 };
34 # endif /* SM_CONF_SEM == 2 */
35 
36 # ifndef SEM_A
37 #  define SEM_A	0200
38 # endif /* SEM_A */
39 # ifndef SEM_R
40 #  define SEM_R	0400
41 # endif /* SEM_R */
42 
43 # define SM_NSEM	1
44 
45 extern int sm_sem_start __P((key_t, int, int, bool));
46 extern int sm_sem_stop __P((int));
47 extern int sm_sem_acq __P((int, int, int));
48 extern int sm_sem_rel __P((int, int, int));
49 extern int sm_sem_get __P((int, int));
50 extern int sm_semsetowner __P((int, uid_t, gid_t, mode_t));
51 
52 # else /* SM_CONF_SEM > 0 */
53 #  define sm_sem_start(key, nsem, semflg, owner) 0
54 #  define sm_sem_stop(semid)	0
55 #  define sm_sem_acq(semid, semnum, timeout)	0
56 #  define sm_sem_rel(semid, semnum, timeout)	0
57 #  define sm_sem_get(semid, semnum)	0
58 # endif /* SM_CONF_SEM > 0 */
59 
60 #endif /* ! SM_SEM_H */
61