int
ipc_event_recv(int *pid_store, int *event_store, unsigned int timeout) {
if (event_store == NULL) {
return -E_INVAL;
}
struct mm_struct *mm = current->mm;
if (pid_store != NULL) {
if (!user_mem_check(mm, (uintptr_t)pid_store, sizeof(int), 1)) {
return -E_INVAL;
}
}
if (!user_mem_check(mm, (uintptr_t)event_store, sizeof(int), 1)) {
return -E_INVAL;
}
unsigned long saved_ticks;
timer_t __timer, *timer = ipc_timer_init(timeout, &saved_ticks, &__timer);
int pid, event, ret;
if ((ret = recv_event(&pid, &event, timer)) == 0) {
lock_mm(mm);
{
ret = -E_INVAL;
if (pid_store == NULL || copy_to_user(mm, pid_store, &pid, sizeof(int))) {
if (copy_to_user(mm, event_store, &event, sizeof(int))) {
ret = 0;
}
}
}
unlock_mm(mm);
return ret;
}
return ipc_check_timeout(timeout, saved_ticks);
}
int ipc_event_send(int pid, int event, unsigned int timeout)
{
struct proc_struct *proc;
if ((proc = find_proc(pid)) == NULL || proc->state == PROC_ZOMBIE) {
return -E_INVAL;
}
if (proc == current || proc == idleproc || proc == initproc) {
return -E_INVAL;
}
#ifdef UCONFIG_SWAP
if(proc == kswapd)
return -E_INVAL;
#endif
if (proc->wait_state == WT_EVENT_RECV) {
wakeup_proc(proc);
}
current->event_box.event = event;
unsigned long saved_ticks;
timer_t __timer, *timer =
ipc_timer_init(timeout, &saved_ticks, &__timer);
uint32_t flags;
if ((flags = send_event(proc, timer)) == 0) {
return 0;
}
assert(flags == WT_INTERRUPTED);
return ipc_check_timeout(timeout, saved_ticks);
}
static int
usem_down(semaphore_t *sem, unsigned int timeout) {
unsigned long saved_ticks;
timer_t __timer, *timer = ipc_timer_init(timeout, &saved_ticks, &__timer);
uint32_t flags;
if ((flags = __down(sem, WT_USEM, timer)) == 0) {
return 0;
}
assert(flags == WT_INTERRUPTED);
return ipc_check_timeout(timeout, saved_ticks);
}