int
shmdt(struct proc *p, struct shmdt_args *uap, int32_t *retval)
{
#if CONFIG_MACF
struct shmid_kernel *shmsegptr;
#endif
struct shmmap_state *shmmap_s;
int i;
int shmdtret = 0;
AUDIT_ARG(svipc_addr, uap->shmaddr);
SYSV_SHM_SUBSYS_LOCK();
if ((shmdtret = shminit())) {
goto shmdt_out;
}
shmmap_s = (struct shmmap_state *)p->vm_shm;
if (shmmap_s == NULL) {
shmdtret = EINVAL;
goto shmdt_out;
}
for (; shmmap_s->shmid != SHMID_SENTINEL; shmmap_s++) {
if (SHMID_IS_VALID(shmmap_s->shmid) &&
shmmap_s->va == (mach_vm_offset_t)uap->shmaddr) {
break;
}
}
if (!SHMID_IS_VALID(shmmap_s->shmid)) {
shmdtret = EINVAL;
goto shmdt_out;
}
#if CONFIG_MACF
/*
* XXX: It might be useful to move this into the shm_delete_mapping
* function
*/
shmsegptr = &shmsegs[IPCID_TO_IX(shmmap_s->shmid)];
shmdtret = mac_sysvshm_check_shmdt(kauth_cred_get(), shmsegptr);
if (shmdtret)
goto shmdt_out;
#endif
i = shm_delete_mapping(p, shmmap_s, 1);
if (i == 0)
*retval = 0;
shmdtret = i;
shmdt_out:
SYSV_SHM_SUBSYS_UNLOCK();
return shmdtret;
}
void
shmexit(struct vmspace *vm)
{
struct shmmap_head *shmmap_h;
struct shmmap_state *shmmap_s;
int i;
shmmap_h = (struct shmmap_head *)vm->vm_shm;
if (shmmap_h == NULL)
return;
for (i = 0, shmmap_s = shmmap_h->state; i < shmmap_h->shmseg;
i++, shmmap_s++)
if (shmmap_s->shmid != -1)
shm_delete_mapping(vm, shmmap_s);
free(vm->vm_shm, M_SHM);
vm->vm_shm = NULL;
}
int
sys_shmdt(struct proc *p, void *v, register_t *retval)
{
struct sys_shmdt_args /* {
syscallarg(const void *) shmaddr;
} */ *uap = v;
struct shmmap_head *shmmap_h;
struct shmmap_state *shmmap_s;
int i;
shmmap_h = (struct shmmap_head *)p->p_vmspace->vm_shm;
if (shmmap_h == NULL)
return (EINVAL);
for (i = 0, shmmap_s = shmmap_h->state; i < shmmap_h->shmseg;
i++, shmmap_s++)
if (shmmap_s->shmid != -1 &&
shmmap_s->va == (vaddr_t)SCARG(uap, shmaddr))
break;
if (i == shmmap_h->shmseg)
return (EINVAL);
return (shm_delete_mapping(p->p_vmspace, shmmap_s));
}
