2 * Copyright (c) 2000-2001, 2003, 2005 Proofpoint, Inc. and its suppliers.
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.
11 SM_RCSID("@(#)$Id: shm.c,v 1.20 2013-11-22 20:51:43 ca Exp $")
17 # include <sm/string.h>
22 ** SM_SHMSTART -- initialize shared memory segment.
25 ** key -- key for shared memory.
26 ** size -- size of segment.
27 ** shmflag -- initial flags.
28 ** shmid -- pointer to return id.
29 ** owner -- create segment.
32 ** pointer to shared memory segment,
36 ** attaches shared memory segment.
40 sm_shmstart(key, size, shmflg, shmid, owner)
48 void *shm = SM_SHM_NULL;
50 /* default: user/group accessible */
52 shmflg = SHM_R|SHM_W|(SHM_R>>3)|(SHM_W>>3);
54 shmflg |= IPC_CREAT|IPC_EXCL;
55 *shmid = shmget(key, size, shmflg);
59 shm = shmat(*shmid, (void *) 0, 0);
60 if (shm == SM_SHM_NULL)
67 if (shm != SM_SHM_NULL || *shmid >= 0)
68 sm_shmstop(shm, *shmid, owner);
69 *shmid = SM_SHM_NO_ID;
76 ** SM_SHMSTOP -- stop using shared memory segment.
79 ** shm -- pointer to shared memory.
81 ** owner -- delete segment.
88 ** detaches (and maybe removes) shared memory segment.
93 sm_shmstop(shm, shmid, owner)
100 if (shm != SM_SHM_NULL && (r = shmdt(shm)) < 0)
102 if (owner && shmid >= 0 && (r = shmctl(shmid, IPC_RMID, NULL)) < 0)
109 ** SM_SHMSETOWNER -- set owner/group/mode of shared memory segment.
115 ** mode -- mode to use
123 sm_shmsetowner(shmid, uid, gid, mode)
130 struct shmid_ds shmid_ds;
132 memset(&shmid_ds, 0, sizeof(shmid_ds));
133 if ((r = shmctl(shmid, IPC_STAT, &shmid_ds)) < 0)
135 shmid_ds.shm_perm.uid = uid;
136 shmid_ds.shm_perm.gid = gid;
137 shmid_ds.shm_perm.mode = mode;
138 if ((r = shmctl(shmid, IPC_SET, &shmid_ds)) < 0)
142 #endif /* SM_CONF_SHM */