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 #pragma ident "%Z%%M% %I% %E% SMI" 117c478bd9Sstevel@tonic-gate 127c478bd9Sstevel@tonic-gate #include <sm/gen.h> 13*49218d4fSjbeck SM_RCSID("@(#)$Id: shm.c,v 1.19 2005/07/14 22:34:28 ca Exp $") 147c478bd9Sstevel@tonic-gate 157c478bd9Sstevel@tonic-gate #if SM_CONF_SHM 167c478bd9Sstevel@tonic-gate # include <stdlib.h> 177c478bd9Sstevel@tonic-gate # include <unistd.h> 187c478bd9Sstevel@tonic-gate # include <errno.h> 19*49218d4fSjbeck # include <sm/string.h> 207c478bd9Sstevel@tonic-gate # include <sm/shm.h> 217c478bd9Sstevel@tonic-gate 227c478bd9Sstevel@tonic-gate 237c478bd9Sstevel@tonic-gate /* 247c478bd9Sstevel@tonic-gate ** SM_SHMSTART -- initialize shared memory segment. 257c478bd9Sstevel@tonic-gate ** 267c478bd9Sstevel@tonic-gate ** Parameters: 277c478bd9Sstevel@tonic-gate ** key -- key for shared memory. 287c478bd9Sstevel@tonic-gate ** size -- size of segment. 297c478bd9Sstevel@tonic-gate ** shmflag -- initial flags. 307c478bd9Sstevel@tonic-gate ** shmid -- pointer to return id. 317c478bd9Sstevel@tonic-gate ** owner -- create segment. 327c478bd9Sstevel@tonic-gate ** 337c478bd9Sstevel@tonic-gate ** Returns: 347c478bd9Sstevel@tonic-gate ** pointer to shared memory segment, 357c478bd9Sstevel@tonic-gate ** NULL on failure. 367c478bd9Sstevel@tonic-gate ** 377c478bd9Sstevel@tonic-gate ** Side Effects: 387c478bd9Sstevel@tonic-gate ** attaches shared memory segment. 397c478bd9Sstevel@tonic-gate */ 407c478bd9Sstevel@tonic-gate 417c478bd9Sstevel@tonic-gate void * 427c478bd9Sstevel@tonic-gate sm_shmstart(key, size, shmflg, shmid, owner) 437c478bd9Sstevel@tonic-gate key_t key; 447c478bd9Sstevel@tonic-gate int size; 457c478bd9Sstevel@tonic-gate int shmflg; 467c478bd9Sstevel@tonic-gate int *shmid; 477c478bd9Sstevel@tonic-gate bool owner; 487c478bd9Sstevel@tonic-gate { 497c478bd9Sstevel@tonic-gate int save_errno; 507c478bd9Sstevel@tonic-gate void *shm = SM_SHM_NULL; 517c478bd9Sstevel@tonic-gate 527c478bd9Sstevel@tonic-gate /* default: user/group accessible */ 537c478bd9Sstevel@tonic-gate if (shmflg == 0) 547c478bd9Sstevel@tonic-gate shmflg = SHM_R|SHM_W|(SHM_R>>3)|(SHM_W>>3); 557c478bd9Sstevel@tonic-gate if (owner) 567c478bd9Sstevel@tonic-gate shmflg |= IPC_CREAT|IPC_EXCL; 577c478bd9Sstevel@tonic-gate *shmid = shmget(key, size, shmflg); 587c478bd9Sstevel@tonic-gate if (*shmid < 0) 597c478bd9Sstevel@tonic-gate goto error; 607c478bd9Sstevel@tonic-gate 617c478bd9Sstevel@tonic-gate shm = shmat(*shmid, (void *) 0, 0); 627c478bd9Sstevel@tonic-gate if (shm == SM_SHM_NULL) 637c478bd9Sstevel@tonic-gate goto error; 647c478bd9Sstevel@tonic-gate 657c478bd9Sstevel@tonic-gate return shm; 667c478bd9Sstevel@tonic-gate 677c478bd9Sstevel@tonic-gate error: 687c478bd9Sstevel@tonic-gate save_errno = errno; 697c478bd9Sstevel@tonic-gate if (shm != SM_SHM_NULL || *shmid >= 0) 707c478bd9Sstevel@tonic-gate sm_shmstop(shm, *shmid, owner); 717c478bd9Sstevel@tonic-gate *shmid = SM_SHM_NO_ID; 727c478bd9Sstevel@tonic-gate errno = save_errno; 737c478bd9Sstevel@tonic-gate return (void *) 0; 747c478bd9Sstevel@tonic-gate } 757c478bd9Sstevel@tonic-gate 767c478bd9Sstevel@tonic-gate 777c478bd9Sstevel@tonic-gate /* 787c478bd9Sstevel@tonic-gate ** SM_SHMSTOP -- stop using shared memory segment. 797c478bd9Sstevel@tonic-gate ** 807c478bd9Sstevel@tonic-gate ** Parameters: 817c478bd9Sstevel@tonic-gate ** shm -- pointer to shared memory. 827c478bd9Sstevel@tonic-gate ** shmid -- id. 837c478bd9Sstevel@tonic-gate ** owner -- delete segment. 847c478bd9Sstevel@tonic-gate ** 857c478bd9Sstevel@tonic-gate ** Returns: 867c478bd9Sstevel@tonic-gate ** 0 on success. 877c478bd9Sstevel@tonic-gate ** < 0 on failure. 887c478bd9Sstevel@tonic-gate ** 897c478bd9Sstevel@tonic-gate ** Side Effects: 907c478bd9Sstevel@tonic-gate ** detaches (and maybe removes) shared memory segment. 917c478bd9Sstevel@tonic-gate */ 927c478bd9Sstevel@tonic-gate 937c478bd9Sstevel@tonic-gate 947c478bd9Sstevel@tonic-gate int 957c478bd9Sstevel@tonic-gate sm_shmstop(shm, shmid, owner) 967c478bd9Sstevel@tonic-gate void *shm; 977c478bd9Sstevel@tonic-gate int shmid; 987c478bd9Sstevel@tonic-gate bool owner; 997c478bd9Sstevel@tonic-gate { 1007c478bd9Sstevel@tonic-gate int r; 1017c478bd9Sstevel@tonic-gate 1027c478bd9Sstevel@tonic-gate if (shm != SM_SHM_NULL && (r = shmdt(shm)) < 0) 1037c478bd9Sstevel@tonic-gate return r; 1047c478bd9Sstevel@tonic-gate if (owner && shmid >= 0 && (r = shmctl(shmid, IPC_RMID, NULL)) < 0) 1057c478bd9Sstevel@tonic-gate return r; 1067c478bd9Sstevel@tonic-gate return 0; 1077c478bd9Sstevel@tonic-gate } 1087c478bd9Sstevel@tonic-gate 1097c478bd9Sstevel@tonic-gate 1107c478bd9Sstevel@tonic-gate /* 1117c478bd9Sstevel@tonic-gate ** SM_SHMSETOWNER -- set owner/group/mode of shared memory segment. 1127c478bd9Sstevel@tonic-gate ** 1137c478bd9Sstevel@tonic-gate ** Parameters: 1147c478bd9Sstevel@tonic-gate ** shmid -- id. 1157c478bd9Sstevel@tonic-gate ** uid -- uid to use 1167c478bd9Sstevel@tonic-gate ** gid -- gid to use 1177c478bd9Sstevel@tonic-gate ** mode -- mode to use 1187c478bd9Sstevel@tonic-gate ** 1197c478bd9Sstevel@tonic-gate ** Returns: 1207c478bd9Sstevel@tonic-gate ** 0 on success. 1217c478bd9Sstevel@tonic-gate ** < 0 on failure. 1227c478bd9Sstevel@tonic-gate */ 1237c478bd9Sstevel@tonic-gate 1247c478bd9Sstevel@tonic-gate int 1257c478bd9Sstevel@tonic-gate sm_shmsetowner(shmid, uid, gid, mode) 1267c478bd9Sstevel@tonic-gate int shmid; 1277c478bd9Sstevel@tonic-gate uid_t uid; 1287c478bd9Sstevel@tonic-gate gid_t gid; 1297c478bd9Sstevel@tonic-gate mode_t mode; 1307c478bd9Sstevel@tonic-gate { 1317c478bd9Sstevel@tonic-gate int r; 1327c478bd9Sstevel@tonic-gate struct shmid_ds shmid_ds; 1337c478bd9Sstevel@tonic-gate 1347c478bd9Sstevel@tonic-gate memset(&shmid_ds, 0, sizeof(shmid_ds)); 1357c478bd9Sstevel@tonic-gate if ((r = shmctl(shmid, IPC_STAT, &shmid_ds)) < 0) 1367c478bd9Sstevel@tonic-gate return r; 1377c478bd9Sstevel@tonic-gate shmid_ds.shm_perm.uid = uid; 1387c478bd9Sstevel@tonic-gate shmid_ds.shm_perm.gid = gid; 1397c478bd9Sstevel@tonic-gate shmid_ds.shm_perm.mode = mode; 1407c478bd9Sstevel@tonic-gate if ((r = shmctl(shmid, IPC_SET, &shmid_ds)) < 0) 1417c478bd9Sstevel@tonic-gate return r; 1427c478bd9Sstevel@tonic-gate return 0; 1437c478bd9Sstevel@tonic-gate } 1447c478bd9Sstevel@tonic-gate #endif /* SM_CONF_SHM */ 145