I was testing an http client that downloads a file from a server, with
NO_SYS=1 and raw api. It seems works well, but I noticed pcapif_poll()
doesn't return during all the download process that takes several
seconds. Indeed pcapif_poll() contains a loop:
void
pcapif_poll(struct netif *netif)
{
...
do {
if (pa->adapter != NULL) {
ret = pcap_dispatch(pa->adapter, -1, pcapif_input, (u_char*)pa);
} else {
ret = -1;
}
...
} while (ret > 0);
}
In NO_SYS=1 I have the classical mainloop:
while(1) {
default_netif_poll();
sys_check_timeouts();
my_other_tasks();
}
So, during all the download process, mainloop is stucked in
default_netif_poll() that calls pcapif_poll().
I think the loop in pcapif_poll() takes care of all the incoming packets
pending in the receveing buffers, so I suspect the packets arrive faster
than lwip application is capable to process them, so incoming packets
are always available after every pcap_dispatch().
Maybe pcapip_poll() can be changed to call pcap_dispatch() a maximum
number of times.
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