17c478bd9Sstevel@tonic-gate /*
27c478bd9Sstevel@tonic-gate * Copyright (c) 2000-2001, 2003, 2005 Sendmail, Inc. and its suppliers.
37c478bd9Sstevel@tonic-gate * All rights reserved.
47c478bd9Sstevel@tonic-gate *
57c478bd9Sstevel@tonic-gate * By using this file, you agree to the terms and conditions set
67c478bd9Sstevel@tonic-gate * forth in the LICENSE file which can be found at the top level of
77c478bd9Sstevel@tonic-gate * the sendmail distribution.
87c478bd9Sstevel@tonic-gate */
97c478bd9Sstevel@tonic-gate
107c478bd9Sstevel@tonic-gate #include <sm/gen.h>
11*49218d4fSjbeck SM_RCSID("@(#)$Id: shm.c,v 1.19 2005/07/14 22:34:28 ca Exp $")
127c478bd9Sstevel@tonic-gate
137c478bd9Sstevel@tonic-gate #if SM_CONF_SHM
147c478bd9Sstevel@tonic-gate # include <stdlib.h>
157c478bd9Sstevel@tonic-gate # include <unistd.h>
167c478bd9Sstevel@tonic-gate # include <errno.h>
17*49218d4fSjbeck # include <sm/string.h>
187c478bd9Sstevel@tonic-gate # include <sm/shm.h>
197c478bd9Sstevel@tonic-gate
207c478bd9Sstevel@tonic-gate
217c478bd9Sstevel@tonic-gate /*
227c478bd9Sstevel@tonic-gate ** SM_SHMSTART -- initialize shared memory segment.
237c478bd9Sstevel@tonic-gate **
247c478bd9Sstevel@tonic-gate ** Parameters:
257c478bd9Sstevel@tonic-gate ** key -- key for shared memory.
267c478bd9Sstevel@tonic-gate ** size -- size of segment.
277c478bd9Sstevel@tonic-gate ** shmflag -- initial flags.
287c478bd9Sstevel@tonic-gate ** shmid -- pointer to return id.
297c478bd9Sstevel@tonic-gate ** owner -- create segment.
307c478bd9Sstevel@tonic-gate **
317c478bd9Sstevel@tonic-gate ** Returns:
327c478bd9Sstevel@tonic-gate ** pointer to shared memory segment,
337c478bd9Sstevel@tonic-gate ** NULL on failure.
347c478bd9Sstevel@tonic-gate **
357c478bd9Sstevel@tonic-gate ** Side Effects:
367c478bd9Sstevel@tonic-gate ** attaches shared memory segment.
377c478bd9Sstevel@tonic-gate */
387c478bd9Sstevel@tonic-gate
397c478bd9Sstevel@tonic-gate void *
407c478bd9Sstevel@tonic-gate sm_shmstart(key, size, shmflg, shmid, owner)
417c478bd9Sstevel@tonic-gate key_t key;
427c478bd9Sstevel@tonic-gate int size;
437c478bd9Sstevel@tonic-gate int shmflg;
447c478bd9Sstevel@tonic-gate int *shmid;
457c478bd9Sstevel@tonic-gate bool owner;
467c478bd9Sstevel@tonic-gate {
477c478bd9Sstevel@tonic-gate int save_errno;
487c478bd9Sstevel@tonic-gate void *shm = SM_SHM_NULL;
497c478bd9Sstevel@tonic-gate
507c478bd9Sstevel@tonic-gate /* default: user/group accessible */
517c478bd9Sstevel@tonic-gate if (shmflg == 0)
527c478bd9Sstevel@tonic-gate shmflg = SHM_R|SHM_W|(SHM_R>>3)|(SHM_W>>3);
537c478bd9Sstevel@tonic-gate if (owner)
547c478bd9Sstevel@tonic-gate shmflg |= IPC_CREAT|IPC_EXCL;
557c478bd9Sstevel@tonic-gate *shmid = shmget(key, size, shmflg);
567c478bd9Sstevel@tonic-gate if (*shmid < 0)
577c478bd9Sstevel@tonic-gate goto error;
587c478bd9Sstevel@tonic-gate
597c478bd9Sstevel@tonic-gate shm = shmat(*shmid, (void *) 0, 0);
607c478bd9Sstevel@tonic-gate if (shm == SM_SHM_NULL)
617c478bd9Sstevel@tonic-gate goto error;
627c478bd9Sstevel@tonic-gate
637c478bd9Sstevel@tonic-gate return shm;
647c478bd9Sstevel@tonic-gate
657c478bd9Sstevel@tonic-gate error:
667c478bd9Sstevel@tonic-gate save_errno = errno;
677c478bd9Sstevel@tonic-gate if (shm != SM_SHM_NULL || *shmid >= 0)
687c478bd9Sstevel@tonic-gate sm_shmstop(shm, *shmid, owner);
697c478bd9Sstevel@tonic-gate *shmid = SM_SHM_NO_ID;
707c478bd9Sstevel@tonic-gate errno = save_errno;
717c478bd9Sstevel@tonic-gate return (void *) 0;
727c478bd9Sstevel@tonic-gate }
737c478bd9Sstevel@tonic-gate
747c478bd9Sstevel@tonic-gate
757c478bd9Sstevel@tonic-gate /*
767c478bd9Sstevel@tonic-gate ** SM_SHMSTOP -- stop using shared memory segment.
777c478bd9Sstevel@tonic-gate **
787c478bd9Sstevel@tonic-gate ** Parameters:
797c478bd9Sstevel@tonic-gate ** shm -- pointer to shared memory.
807c478bd9Sstevel@tonic-gate ** shmid -- id.
817c478bd9Sstevel@tonic-gate ** owner -- delete segment.
827c478bd9Sstevel@tonic-gate **
837c478bd9Sstevel@tonic-gate ** Returns:
847c478bd9Sstevel@tonic-gate ** 0 on success.
857c478bd9Sstevel@tonic-gate ** < 0 on failure.
867c478bd9Sstevel@tonic-gate **
877c478bd9Sstevel@tonic-gate ** Side Effects:
887c478bd9Sstevel@tonic-gate ** detaches (and maybe removes) shared memory segment.
897c478bd9Sstevel@tonic-gate */
907c478bd9Sstevel@tonic-gate
917c478bd9Sstevel@tonic-gate
927c478bd9Sstevel@tonic-gate int
sm_shmstop(shm,shmid,owner)937c478bd9Sstevel@tonic-gate sm_shmstop(shm, shmid, owner)
947c478bd9Sstevel@tonic-gate void *shm;
957c478bd9Sstevel@tonic-gate int shmid;
967c478bd9Sstevel@tonic-gate bool owner;
977c478bd9Sstevel@tonic-gate {
987c478bd9Sstevel@tonic-gate int r;
997c478bd9Sstevel@tonic-gate
1007c478bd9Sstevel@tonic-gate if (shm != SM_SHM_NULL && (r = shmdt(shm)) < 0)
1017c478bd9Sstevel@tonic-gate return r;
1027c478bd9Sstevel@tonic-gate if (owner && shmid >= 0 && (r = shmctl(shmid, IPC_RMID, NULL)) < 0)
1037c478bd9Sstevel@tonic-gate return r;
1047c478bd9Sstevel@tonic-gate return 0;
1057c478bd9Sstevel@tonic-gate }
1067c478bd9Sstevel@tonic-gate
1077c478bd9Sstevel@tonic-gate
1087c478bd9Sstevel@tonic-gate /*
1097c478bd9Sstevel@tonic-gate ** SM_SHMSETOWNER -- set owner/group/mode of shared memory segment.
1107c478bd9Sstevel@tonic-gate **
1117c478bd9Sstevel@tonic-gate ** Parameters:
1127c478bd9Sstevel@tonic-gate ** shmid -- id.
1137c478bd9Sstevel@tonic-gate ** uid -- uid to use
1147c478bd9Sstevel@tonic-gate ** gid -- gid to use
1157c478bd9Sstevel@tonic-gate ** mode -- mode to use
1167c478bd9Sstevel@tonic-gate **
1177c478bd9Sstevel@tonic-gate ** Returns:
1187c478bd9Sstevel@tonic-gate ** 0 on success.
1197c478bd9Sstevel@tonic-gate ** < 0 on failure.
1207c478bd9Sstevel@tonic-gate */
1217c478bd9Sstevel@tonic-gate
1227c478bd9Sstevel@tonic-gate int
sm_shmsetowner(shmid,uid,gid,mode)1237c478bd9Sstevel@tonic-gate sm_shmsetowner(shmid, uid, gid, mode)
1247c478bd9Sstevel@tonic-gate int shmid;
1257c478bd9Sstevel@tonic-gate uid_t uid;
1267c478bd9Sstevel@tonic-gate gid_t gid;
1277c478bd9Sstevel@tonic-gate mode_t mode;
1287c478bd9Sstevel@tonic-gate {
1297c478bd9Sstevel@tonic-gate int r;
1307c478bd9Sstevel@tonic-gate struct shmid_ds shmid_ds;
1317c478bd9Sstevel@tonic-gate
1327c478bd9Sstevel@tonic-gate memset(&shmid_ds, 0, sizeof(shmid_ds));
1337c478bd9Sstevel@tonic-gate if ((r = shmctl(shmid, IPC_STAT, &shmid_ds)) < 0)
1347c478bd9Sstevel@tonic-gate return r;
1357c478bd9Sstevel@tonic-gate shmid_ds.shm_perm.uid = uid;
1367c478bd9Sstevel@tonic-gate shmid_ds.shm_perm.gid = gid;
1377c478bd9Sstevel@tonic-gate shmid_ds.shm_perm.mode = mode;
1387c478bd9Sstevel@tonic-gate if ((r = shmctl(shmid, IPC_SET, &shmid_ds)) < 0)
1397c478bd9Sstevel@tonic-gate return r;
1407c478bd9Sstevel@tonic-gate return 0;
1417c478bd9Sstevel@tonic-gate }
1427c478bd9Sstevel@tonic-gate #endif /* SM_CONF_SHM */
143