asmlinkage long sys_msgget (key_t key, int msgflg)
{
int id, ret = -EPERM;
struct msg_queue *msq;
down(&msg_ids.sem);
if (key == IPC_PRIVATE)
ret = newque(key, msgflg);
else if ((id = ipc_findkey(&msg_ids, key)) == -1) { /* key not used */
if (!(msgflg & IPC_CREAT))
ret = -ENOENT;
else
ret = newque(key, msgflg);
} else if (msgflg & IPC_CREAT && msgflg & IPC_EXCL) {
ret = -EEXIST;
} else {
msq = msg_lock(id);
if(msq==NULL)
BUG();
if (ipcperms(&msq->q_perm, msgflg))
ret = -EACCES;
else
ret = msg_buildid(id, msq->q_perm.seq);
msg_unlock(id);
}
up(&msg_ids.sem);
TRACE_IPC(TRACE_EV_IPC_MSG_CREATE, ret, msgflg);
return ret;
}
asmlinkage long sys_semget (key_t key, int nsems, int semflg)
{
int id, err = -EINVAL;
struct sem_array *sma;
if (nsems < 0 || nsems > sc_semmsl)
return -EINVAL;
down(&sem_ids.sem);
if (key == IPC_PRIVATE) {
err = newary(key, nsems, semflg);
} else if ((id = ipc_findkey(&sem_ids, key)) == -1) { /* key not used */
if (!(semflg & IPC_CREAT))
err = -ENOENT;
else
err = newary(key, nsems, semflg);
} else if (semflg & IPC_CREAT && semflg & IPC_EXCL) {
err = -EEXIST;
} else {
sma = sem_lock(id);
if(sma==NULL)
BUG();
if (nsems > sma->sem_nsems)
err = -EINVAL;
else if (ipcperms(&sma->sem_perm, semflg))
err = -EACCES;
else
err = sem_buildid(id, sma->sem_perm.seq);
sem_unlock(id);
}
up(&sem_ids.sem);
return err;
}
asmlinkage long sys_msgget(key_t key, int msgflg)
{
struct msg_queue *msq;
int id, ret = -EPERM;
struct ipc_namespace *ns;
ns = current->nsproxy->ipc_ns;
mutex_lock(&msg_ids(ns).mutex);
if (key == IPC_PRIVATE)
ret = newque(ns, key, msgflg);
else if ((id = ipc_findkey(&msg_ids(ns), key)) == -1) { /* key not used */
if (!(msgflg & IPC_CREAT))
ret = -ENOENT;
else
ret = newque(ns, key, msgflg);
} else if (msgflg & IPC_CREAT && msgflg & IPC_EXCL) {
ret = -EEXIST;
} else {
msq = msg_lock(ns, id);
BUG_ON(msq == NULL);
if (ipcperms(&msq->q_perm, msgflg))
ret = -EACCES;
else {
int qid = msg_buildid(ns, id, msq->q_perm.seq);
ret = security_msg_queue_associate(msq, msgflg);
if (!ret)
ret = qid;
}
msg_unlock(msq);
}
mutex_unlock(&msg_ids(ns).mutex);
return ret;
}
