bsd/kern/sysv_shm.c

247 	struct shmid_kernel *shmseg;
252 	shmseg = &shmsegs[segnum];
253 	if ((shmseg->u.shm_perm.mode & (SHMSEG_ALLOCATED | SHMSEG_REMOVED))
255 	    shmseg->u.shm_perm._seq != IPCID_TO_SEQ(shmid))
257 	return shmseg;
261 shm_deallocate_segment(struct shmid_kernel *shmseg)
266 	for (shm_handle = CAST_DOWN(void *,shmseg->u.shm_internal); /* tunnel */
273 	shmseg->u.shm_internal = USER_ADDR_NULL;		/* tunnel */
274 	size = mach_vm_round_page(shmseg->u.shm_segsz);
277 	shmseg->u.shm_perm.mode = SHMSEG_FREE;
280 	mac_sysvshm_label_recycle(shmseg);
288 	struct shmid_kernel *shmseg;
293 	shmseg = &shmsegs[segnum];
294 	size = mach_vm_round_page(shmseg->u.shm_segsz);	/* XXX done for us? */
301 	shmseg->u.shm_dtime = sysv_shmtime();
302 	if ((--shmseg->u.shm_nattch <= 0) &&
303 	    (shmseg->u.shm_perm.mode & SHMSEG_REMOVED)) {
304 		shm_deallocate_segment(shmseg);
333 	for (i = 0; i < shminfo.shmseg; i++, shmmap_s++)
337 	if (i == shminfo.shmseg) {
365 	struct shmid_kernel	*shmseg;
391 		size = shminfo.shmseg * sizeof(struct shmmap_state);
397 		for (i = 0; i < shminfo.shmseg; i++)
401 	shmseg = shm_find_segment_by_shmid(uap->shmid);
402 	if (shmseg == NULL) {
407 	AUDIT_ARG(svipc_perm, &shmseg->u.shm_perm);
408 	error = ipcperm(kauth_cred_get(), &shmseg->u.shm_perm,
416 	error = mac_sysvshm_check_shmat(kauth_cred_get(), shmseg, uap->shmflg);
422 	for (i = 0; i < shminfo.shmseg; i++) {
427 	if (i >= shminfo.shmseg) {
432 	map_size = mach_vm_round_page(shmseg->u.shm_segsz);
475 	for (shm_handle = CAST_DOWN(void *, shmseg->u.shm_internal);/* tunnel */
499 	shmseg->u.shm_lpid = p->p_pid;
500 	shmseg->u.shm_atime = sysv_shmtime();
501 	shmseg->u.shm_nattch++;
548 	struct shmid_kernel *shmseg;
561 	shmseg = shm_find_segment_by_shmid(uap->shmid);
562 	if (shmseg == NULL) {
570 	AUDIT_ARG(svipc_perm, &shmseg->u.shm_perm);
573 	error = mac_sysvshm_check_shmctl(cred, shmseg, uap->cmd);
581 		error = ipcperm(cred, &shmseg->u.shm_perm, IPC_R);
588 			error = copyout((caddr_t)&shmseg->u, uap->buf, sizeof(struct user_shmid_ds));
591 			shmid_ds_64to32(&shmseg->u, &shmid_ds32);
600 		error = ipcperm(cred, &shmseg->u.shm_perm, IPC_M);
617 		shmseg->u.shm_perm.uid = inbuf.shm_perm.uid;
618 		shmseg->u.shm_perm.gid = inbuf.shm_perm.gid;
619 		shmseg->u.shm_perm.mode =
620 		    (shmseg->u.shm_perm.mode & ~ACCESSPERMS) |
622 		shmseg->u.shm_ctime = sysv_shmtime();
625 		error = ipcperm(cred, &shmseg->u.shm_perm, IPC_M);
630 		shmseg->u.shm_perm._key = IPC_PRIVATE;
631 		shmseg->u.shm_perm.mode |= SHMSEG_REMOVED;
632 		if (shmseg->u.shm_nattch <= 0) {
633 			shm_deallocate_segment(shmseg);
655 	struct shmid_kernel *shmseg;
658 	shmseg = &shmsegs[segnum];
659 	if (shmseg->u.shm_perm.mode & SHMSEG_REMOVED) {
665 		shmseg->u.shm_perm.mode |= SHMSEG_WANTED;
666 		error = tsleep((caddr_t)shmseg, PLOCK | PCATCH, "shmget", 0);
680 	if ((shmseg->u.shm_perm.mode & mode) != mode)
684 	error = mac_sysvshm_check_shmget(kauth_cred_get(), shmseg, uap->shmflg);
689 	if (uap->size && uap->size > shmseg->u.shm_segsz)
695 	*retval = IXSEQ_TO_IPCID(segnum, shmseg->u.shm_perm);
705 	struct shmid_kernel *shmseg;
725 			panic("shmseg free count inconsistent");
731 	shmseg = &shmsegs[segnum];
738 	shmseg->u.shm_perm.mode = SHMSEG_ALLOCATED | SHMSEG_REMOVED;
739 	shmseg->u.shm_perm._key = uap->key;
740 	shmseg->u.shm_perm._seq = (shmseg->u.shm_perm._seq + 1) & 0x7fff;
767 			shmseg->u.shm_internal = CAST_USER_ADDR_T(shm_handle);/* tunnel */
774 	shmid = IXSEQ_TO_IPCID(segnum, shmseg->u.shm_perm);
776 	shmseg->u.shm_perm.cuid = shmseg->u.shm_perm.uid = kauth_cred_getuid(cred);
777 	shmseg->u.shm_perm.cgid = shmseg->u.shm_perm.gid = kauth_cred_getgid(cred);
778 	shmseg->u.shm_perm.mode = (shmseg->u.shm_perm.mode & SHMSEG_WANTED) |
780 	shmseg->u.shm_segsz = uap->size;
781 	shmseg->u.shm_cpid = p->p_pid;
782 	shmseg->u.shm_lpid = shmseg->u.shm_nattch = 0;
783 	shmseg->u.shm_atime = shmseg->u.shm_dtime = 0;
785 	mac_sysvshm_label_associate(cred, shmseg);
787 	shmseg->u.shm_ctime = sysv_shmtime();
790 	AUDIT_ARG(svipc_perm, &shmseg->u.shm_perm);
791 	if (shmseg->u.shm_perm.mode & SHMSEG_WANTED) {
796 		shmseg->u.shm_perm.mode &= ~SHMSEG_WANTED;
797 		wakeup((caddr_t)shmseg);
804 		for (shm_handle = CAST_DOWN(void *,shmseg->u.shm_internal); /* tunnel */
811 		shmseg->u.shm_internal = USER_ADDR_NULL; /* tunnel */
913 	size = shminfo.shmseg * sizeof(struct shmmap_state);
918 		for (i = 0; i < shminfo.shmseg; i++, shmmap_s++)
940 	for (i = 0; i < shminfo.shmseg; i++, shmmap_s++)
966 	for (i = 0; i < shminfo.shmseg; i++, shmmap_s++)
1179 SYSCTL_PROC(_kern_sysv, OID_AUTO, shmseg, CTLTYPE_QUAD | CTLFLAG_RW | CTLFLAG_LOCKED,
1180     &shminfo.shmseg, 0, &sysctl_shminfo ,"Q","shmseg");