mqd_t do_mq_open()
{
size_t name_size = sizeof(char) * MAX_NAME_SIZE;
char *name = (char *)malloc(name_size);
sys_datacopy(who_e, (vir_bytes)m_in.m7_p1, SELF, (vir_bytes)name, name_size);
int open_flag = m_in.m7_i1;
int blocking_flag = m_in.m7_i2;
int max_mess = m_in.m7_i3;
int grp_id = m_in.m7_i4;
uid_t my_uid = mproc[who_p].mp_realuid;
int grp_index = array_search(groups_ids, MAX_ADMINS, grp_id);
if (grp_index < 0) {
printf("Error: queue Group not found in the group list\n");
return FAIL;
}
int grp_policy = groups_attr[grp_index]->grouptype;
int uid_index = array_search(groups_attr[grp_index]->sendingusers, MAX_ADMINS, my_uid);
if(uid_index < 0) {
uid_index = array_search(groups_attr[grp_index]->receivingusers, MAX_ADMINS, my_uid);
}
/* public || secure */
if ((grp_policy != 0 && uid_index >= 0) || (grp_policy == 0 && uid_index < 0)) {
if (my_uid != groups_attr[grp_index]->creator || my_uid != 0) {
printf("Error: user not allowed to open the queue\n");
return FAIL;
}
}
// printf("do_mq_open: printing of variables\n");
// printf(" name %s\n", name);
// printf(" open_flag %d\n", open_flag);
// printf(" blocking_flag %d\n", blocking_flag);
// printf(" max_mess %d\n", max_mess);
if (curr_num_queues == MAX_QUEUES)
{
printf("Maximum number of queues have already been opened.\n");
return FAIL;
}
pid_t calling_proc = mproc[who_p].mp_pid;
if (calling_proc < 1)
{
printf("Unable to acquire the calling process's PID.\n");
return FAIL;
}
if (open_flag != O_RDONLY && open_flag != O_WRONLY && open_flag != O_RDWR)
{
printf("The open flag must either be O_RDONLY, O_WRONLY, or O_RDWR.\n");
return FAIL;
}
// printf("do_mq_open: name of queue: %s\n", name);
int i;
for (i = 0; i < curr_num_queues; i++)
{
if (strcmp(queues[i].attr->name, name) == 0)
{
if (open_flag == O_RDONLY)
{
int success = addproc(queues[i].receiver_pids, calling_proc);
if (success == FAIL)
return FAIL;
}
else if (open_flag == O_WRONLY)
{
int success = addproc(queues[i].sender_pids, calling_proc);
if (success == FAIL)
return FAIL;
}
else
{
int success = addproc(queues[i].sender_pids, calling_proc);
if (success == FAIL)
return FAIL;
success = addproc(queues[i].receiver_pids, calling_proc);
if (success == FAIL)
{
deleteproc(queues[i].sender_pids, calling_proc);
return FAIL;
}
}
return i;
}
}
queues_mask[curr_num_queues++] = 1;
// printf("do_mq_open: curr_num_queues %d\n", curr_num_req);
mq_t *new_queue = malloc(sizeof(mq_t));
new_queue->attr = malloc(sizeof(mq_attr_t));
new_queue->attr->name = (char *)name;
new_queue->attr->send_blocking = blocking_flag;
new_queue->attr->receive_blocking = blocking_flag;
new_queue->attr->max_message_size = MAX_MESSAGE_SIZE;
new_queue->attr->grp_id = grp_id;
printf("do_mq_open: new_queue->attr->grp_id = %d\n", new_queue->attr->grp_id);
if (max_mess)
{
new_queue->attr->max_messages = max_mess;
}
else
{
new_queue->attr->max_messages = MAX_MESSAGES;
}
new_queue->curr_num_messages_total = 0;
new_queue->sender_pids = malloc(sizeof(SIZE_INT * MAX_PROCESSES));
new_queue->receiver_pids = malloc(sizeof(SIZE_INT * MAX_PROCESSES));
new_queue->queue_high = malloc(sizeof(queue_t));
new_queue->queue_norm = malloc(sizeof(queue_t));
new_queue->queue_low = malloc(sizeof(queue_t));
int num_messages = new_queue->attr->max_messages;
int size_messages = new_queue->attr->max_message_size;
// TODO: go back and fix this size of
new_queue->queue_high->messages = malloc(sizeof(message_t) * num_messages * size_messages);
new_queue->queue_norm->messages = malloc(sizeof(message_t) * num_messages * size_messages);
new_queue->queue_low->messages = malloc(sizeof(message_t) * num_messages * size_messages);
init_queue(new_queue->queue_high, num_messages);
init_queue(new_queue->queue_norm, num_messages);
init_queue(new_queue->queue_low, num_messages);
queues[curr_num_queues - 1] = *new_queue;
return curr_num_queues - 1;
}
static void
sysrfork(void)
{
u32int flags;
int rc, i;
Process *p;
Segment *s, *t;
Fd *old;
flags = arg(0);
if(systrace)
fprint(2, "rfork(%#o)\n", flags);
if((flags & (RFFDG | RFCFDG)) == (RFFDG | RFCFDG) ||
(flags & (RFNAMEG | RFCNAMEG)) == (RFNAMEG | RFCNAMEG) ||
(flags & (RFENVG | RFCENVG)) == (RFENVG | RFCENVG)) {
P->R[0] = -1;
cherrstr("bad arg in syscall");
return;
}
if((flags & RFPROC) == 0) {
if(flags & RFFDG) {
old = P->fd;
P->fd = copyfd(P->fd);
fddecref(old);
}
if(flags & RFCFDG) {
old = P->fd;
P->fd = newfd();
fddecref(old);
}
P->R[0] = noteerr(rfork(flags), 0);
return;
}
incref(&nproc);
p = emallocz(sizeof(Process));
memcpy(p, P, sizeof(Process));
for(i = 0; i < SEGNUM; i++) {
s = p->S[i];
if(s == nil)
continue;
if((flags & RFMEM) == 0 && i != SEGTEXT || i == SEGSTACK) {
t = emallocz(sizeof(Segment));
incref(t);
t->size = s->size;
t->start = s->start;
t->dref = emalloc(sizeof(Ref) + s->size);
memset(t->dref, 0, sizeof(Ref));
incref(t->dref);
t->data = t->dref + 1;
memcpy(t->data, s->data, s->size);
p->S[i] = t;
} else {
incref(s->dref);
incref(s);
}
}
if(flags & RFFDG)
p->fd = copyfd(P->fd);
else if(flags & RFCFDG)
p->fd = newfd();
else
incref(P->fd);
incref(P->path);
rc = rfork(RFMEM | flags);
if(rc < 0) /* this should NEVER happen */
sysfatal("rfork failed wtf: %r");
if(rc == 0) {
P = p;
atexit(cleanup);
P->pid = getpid();
inittos();
addproc(P);
}
P->R[0] = rc;
}
