1*7c478bd9Sstevel@tonic-gate /* 2*7c478bd9Sstevel@tonic-gate * Copyright (c) 2000-2001, 2003, 2005 Sendmail, Inc. and its suppliers. 3*7c478bd9Sstevel@tonic-gate * All rights reserved. 4*7c478bd9Sstevel@tonic-gate * 5*7c478bd9Sstevel@tonic-gate * By using this file, you agree to the terms and conditions set 6*7c478bd9Sstevel@tonic-gate * forth in the LICENSE file which can be found at the top level of 7*7c478bd9Sstevel@tonic-gate * the sendmail distribution. 8*7c478bd9Sstevel@tonic-gate */ 9*7c478bd9Sstevel@tonic-gate 10*7c478bd9Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI" 11*7c478bd9Sstevel@tonic-gate 12*7c478bd9Sstevel@tonic-gate #include <sm/gen.h> 13*7c478bd9Sstevel@tonic-gate SM_RCSID("@(#)$Id: shm.c,v 1.18 2005/02/09 01:54:51 ca Exp $") 14*7c478bd9Sstevel@tonic-gate 15*7c478bd9Sstevel@tonic-gate #if SM_CONF_SHM 16*7c478bd9Sstevel@tonic-gate # include <stdlib.h> 17*7c478bd9Sstevel@tonic-gate # include <unistd.h> 18*7c478bd9Sstevel@tonic-gate # include <errno.h> 19*7c478bd9Sstevel@tonic-gate # include <sm/shm.h> 20*7c478bd9Sstevel@tonic-gate 21*7c478bd9Sstevel@tonic-gate 22*7c478bd9Sstevel@tonic-gate /* 23*7c478bd9Sstevel@tonic-gate ** SM_SHMSTART -- initialize shared memory segment. 24*7c478bd9Sstevel@tonic-gate ** 25*7c478bd9Sstevel@tonic-gate ** Parameters: 26*7c478bd9Sstevel@tonic-gate ** key -- key for shared memory. 27*7c478bd9Sstevel@tonic-gate ** size -- size of segment. 28*7c478bd9Sstevel@tonic-gate ** shmflag -- initial flags. 29*7c478bd9Sstevel@tonic-gate ** shmid -- pointer to return id. 30*7c478bd9Sstevel@tonic-gate ** owner -- create segment. 31*7c478bd9Sstevel@tonic-gate ** 32*7c478bd9Sstevel@tonic-gate ** Returns: 33*7c478bd9Sstevel@tonic-gate ** pointer to shared memory segment, 34*7c478bd9Sstevel@tonic-gate ** NULL on failure. 35*7c478bd9Sstevel@tonic-gate ** 36*7c478bd9Sstevel@tonic-gate ** Side Effects: 37*7c478bd9Sstevel@tonic-gate ** attaches shared memory segment. 38*7c478bd9Sstevel@tonic-gate */ 39*7c478bd9Sstevel@tonic-gate 40*7c478bd9Sstevel@tonic-gate void * 41*7c478bd9Sstevel@tonic-gate sm_shmstart(key, size, shmflg, shmid, owner) 42*7c478bd9Sstevel@tonic-gate key_t key; 43*7c478bd9Sstevel@tonic-gate int size; 44*7c478bd9Sstevel@tonic-gate int shmflg; 45*7c478bd9Sstevel@tonic-gate int *shmid; 46*7c478bd9Sstevel@tonic-gate bool owner; 47*7c478bd9Sstevel@tonic-gate { 48*7c478bd9Sstevel@tonic-gate int save_errno; 49*7c478bd9Sstevel@tonic-gate void *shm = SM_SHM_NULL; 50*7c478bd9Sstevel@tonic-gate 51*7c478bd9Sstevel@tonic-gate /* default: user/group accessible */ 52*7c478bd9Sstevel@tonic-gate if (shmflg == 0) 53*7c478bd9Sstevel@tonic-gate shmflg = SHM_R|SHM_W|(SHM_R>>3)|(SHM_W>>3); 54*7c478bd9Sstevel@tonic-gate if (owner) 55*7c478bd9Sstevel@tonic-gate shmflg |= IPC_CREAT|IPC_EXCL; 56*7c478bd9Sstevel@tonic-gate *shmid = shmget(key, size, shmflg); 57*7c478bd9Sstevel@tonic-gate if (*shmid < 0) 58*7c478bd9Sstevel@tonic-gate goto error; 59*7c478bd9Sstevel@tonic-gate 60*7c478bd9Sstevel@tonic-gate shm = shmat(*shmid, (void *) 0, 0); 61*7c478bd9Sstevel@tonic-gate if (shm == SM_SHM_NULL) 62*7c478bd9Sstevel@tonic-gate goto error; 63*7c478bd9Sstevel@tonic-gate 64*7c478bd9Sstevel@tonic-gate return shm; 65*7c478bd9Sstevel@tonic-gate 66*7c478bd9Sstevel@tonic-gate error: 67*7c478bd9Sstevel@tonic-gate save_errno = errno; 68*7c478bd9Sstevel@tonic-gate if (shm != SM_SHM_NULL || *shmid >= 0) 69*7c478bd9Sstevel@tonic-gate sm_shmstop(shm, *shmid, owner); 70*7c478bd9Sstevel@tonic-gate *shmid = SM_SHM_NO_ID; 71*7c478bd9Sstevel@tonic-gate errno = save_errno; 72*7c478bd9Sstevel@tonic-gate return (void *) 0; 73*7c478bd9Sstevel@tonic-gate } 74*7c478bd9Sstevel@tonic-gate 75*7c478bd9Sstevel@tonic-gate 76*7c478bd9Sstevel@tonic-gate /* 77*7c478bd9Sstevel@tonic-gate ** SM_SHMSTOP -- stop using shared memory segment. 78*7c478bd9Sstevel@tonic-gate ** 79*7c478bd9Sstevel@tonic-gate ** Parameters: 80*7c478bd9Sstevel@tonic-gate ** shm -- pointer to shared memory. 81*7c478bd9Sstevel@tonic-gate ** shmid -- id. 82*7c478bd9Sstevel@tonic-gate ** owner -- delete segment. 83*7c478bd9Sstevel@tonic-gate ** 84*7c478bd9Sstevel@tonic-gate ** Returns: 85*7c478bd9Sstevel@tonic-gate ** 0 on success. 86*7c478bd9Sstevel@tonic-gate ** < 0 on failure. 87*7c478bd9Sstevel@tonic-gate ** 88*7c478bd9Sstevel@tonic-gate ** Side Effects: 89*7c478bd9Sstevel@tonic-gate ** detaches (and maybe removes) shared memory segment. 90*7c478bd9Sstevel@tonic-gate */ 91*7c478bd9Sstevel@tonic-gate 92*7c478bd9Sstevel@tonic-gate 93*7c478bd9Sstevel@tonic-gate int 94*7c478bd9Sstevel@tonic-gate sm_shmstop(shm, shmid, owner) 95*7c478bd9Sstevel@tonic-gate void *shm; 96*7c478bd9Sstevel@tonic-gate int shmid; 97*7c478bd9Sstevel@tonic-gate bool owner; 98*7c478bd9Sstevel@tonic-gate { 99*7c478bd9Sstevel@tonic-gate int r; 100*7c478bd9Sstevel@tonic-gate 101*7c478bd9Sstevel@tonic-gate if (shm != SM_SHM_NULL && (r = shmdt(shm)) < 0) 102*7c478bd9Sstevel@tonic-gate return r; 103*7c478bd9Sstevel@tonic-gate if (owner && shmid >= 0 && (r = shmctl(shmid, IPC_RMID, NULL)) < 0) 104*7c478bd9Sstevel@tonic-gate return r; 105*7c478bd9Sstevel@tonic-gate return 0; 106*7c478bd9Sstevel@tonic-gate } 107*7c478bd9Sstevel@tonic-gate 108*7c478bd9Sstevel@tonic-gate 109*7c478bd9Sstevel@tonic-gate /* 110*7c478bd9Sstevel@tonic-gate ** SM_SHMSETOWNER -- set owner/group/mode of shared memory segment. 111*7c478bd9Sstevel@tonic-gate ** 112*7c478bd9Sstevel@tonic-gate ** Parameters: 113*7c478bd9Sstevel@tonic-gate ** shmid -- id. 114*7c478bd9Sstevel@tonic-gate ** uid -- uid to use 115*7c478bd9Sstevel@tonic-gate ** gid -- gid to use 116*7c478bd9Sstevel@tonic-gate ** mode -- mode to use 117*7c478bd9Sstevel@tonic-gate ** 118*7c478bd9Sstevel@tonic-gate ** Returns: 119*7c478bd9Sstevel@tonic-gate ** 0 on success. 120*7c478bd9Sstevel@tonic-gate ** < 0 on failure. 121*7c478bd9Sstevel@tonic-gate */ 122*7c478bd9Sstevel@tonic-gate 123*7c478bd9Sstevel@tonic-gate int 124*7c478bd9Sstevel@tonic-gate sm_shmsetowner(shmid, uid, gid, mode) 125*7c478bd9Sstevel@tonic-gate int shmid; 126*7c478bd9Sstevel@tonic-gate uid_t uid; 127*7c478bd9Sstevel@tonic-gate gid_t gid; 128*7c478bd9Sstevel@tonic-gate mode_t mode; 129*7c478bd9Sstevel@tonic-gate { 130*7c478bd9Sstevel@tonic-gate int r; 131*7c478bd9Sstevel@tonic-gate struct shmid_ds shmid_ds; 132*7c478bd9Sstevel@tonic-gate 133*7c478bd9Sstevel@tonic-gate memset(&shmid_ds, 0, sizeof(shmid_ds)); 134*7c478bd9Sstevel@tonic-gate if ((r = shmctl(shmid, IPC_STAT, &shmid_ds)) < 0) 135*7c478bd9Sstevel@tonic-gate return r; 136*7c478bd9Sstevel@tonic-gate shmid_ds.shm_perm.uid = uid; 137*7c478bd9Sstevel@tonic-gate shmid_ds.shm_perm.gid = gid; 138*7c478bd9Sstevel@tonic-gate shmid_ds.shm_perm.mode = mode; 139*7c478bd9Sstevel@tonic-gate if ((r = shmctl(shmid, IPC_SET, &shmid_ds)) < 0) 140*7c478bd9Sstevel@tonic-gate return r; 141*7c478bd9Sstevel@tonic-gate return 0; 142*7c478bd9Sstevel@tonic-gate } 143*7c478bd9Sstevel@tonic-gate #endif /* SM_CONF_SHM */ 144