static int read_telegram(struct r3964_info *pInfo, struct pid *pid,
unsigned char __user * buf)
{
struct r3964_client_info *pClient;
struct r3964_block_header *block;
if (!buf) {
return -EINVAL;
}
pClient = findClient(pInfo, pid);
if (pClient == NULL) {
return -EINVAL;
}
block = pClient->next_block_to_read;
if (!block) {
return 0;
} else {
if (copy_to_user(buf, block->data, block->length))
return -EFAULT;
remove_client_block(pInfo, pClient);
return block->length;
}
return -EINVAL;
}
static struct r3964_message *remove_msg(struct r3964_info *pInfo,
struct r3964_client_info *pClient)
{
struct r3964_message *pMsg=NULL;
unsigned long flags;
if(pClient->first_msg)
{
save_flags(flags);
cli();
pMsg = pClient->first_msg;
pClient->first_msg = pMsg->next;
if(pClient->first_msg==NULL)
{
pClient->last_msg = NULL;
}
pClient->msg_count--;
if(pMsg->block)
{
remove_client_block(pInfo, pClient);
pClient->next_block_to_read = pMsg->block;
}
restore_flags(flags);
}
return pMsg;
}