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#include <errno.h>
#include <poll.h>
#include <wasi/descriptor_table.h>
typedef struct {
poll_own_pollable_t pollable;
struct pollfd *pollfd;
descriptor_table_entry_t *entry;
short events;
} state_t;
int poll_wasip2(struct pollfd *fds, size_t nfds, int timeout)
{
int event_count = 0;
for (size_t i = 0; i < nfds; ++i) {
fds[i].revents = 0;
}
size_t max_pollables = (2 * nfds) + 1;
state_t states[max_pollables];
size_t state_index = 0;
for (size_t i = 0; i < nfds; ++i) {
struct pollfd *pollfd = fds + i;
descriptor_table_entry_t *entry;
if (descriptor_table_get_ref(pollfd->fd, &entry)) {
switch (entry->tag) {
case DESCRIPTOR_TABLE_ENTRY_TCP_SOCKET: {
tcp_socket_t *socket = &(entry->tcp_socket);
switch (socket->state.tag) {
case TCP_SOCKET_STATE_CONNECTING:
case TCP_SOCKET_STATE_LISTENING: {
if ((pollfd->events &
(POLLRDNORM | POLLWRNORM)) != 0) {
states[state_index++] = (state_t){
.pollable =
socket->socket_pollable,
.pollfd = pollfd,
.entry = entry,
.events = pollfd->events
};
}
break;
}
case TCP_SOCKET_STATE_CONNECTED: {
if ((pollfd->events & POLLRDNORM) !=
0) {
states[state_index++] = (state_t){
.pollable =
socket->state
.connected
.input_pollable,
.pollfd = pollfd,
.entry = entry,
.events = POLLRDNORM
};
}
if ((pollfd->events & POLLWRNORM) !=
0) {
states[state_index++] = (state_t){
.pollable =
socket->state
.connected
.output_pollable,
.pollfd = pollfd,
.entry = entry,
.events = POLLWRNORM
};
}
break;
}
case TCP_SOCKET_STATE_CONNECT_FAILED: {
if (pollfd->revents == 0) {
++event_count;
}
pollfd->revents |= pollfd->events;
break;
}
default:
errno = ENOTSUP;
return -1;
}
break;
}
case DESCRIPTOR_TABLE_ENTRY_UDP_SOCKET: {
udp_socket_t *socket = &(entry->udp_socket);
switch (socket->state.tag) {
case UDP_SOCKET_STATE_UNBOUND:
case UDP_SOCKET_STATE_BOUND_NOSTREAMS: {
if (pollfd->revents == 0) {
++event_count;
}
pollfd->revents |= pollfd->events;
break;
}
case UDP_SOCKET_STATE_BOUND_STREAMING:
case UDP_SOCKET_STATE_CONNECTED: {
udp_socket_streams_t *streams;
if (socket->state.tag ==
UDP_SOCKET_STATE_BOUND_STREAMING) {
streams = &(
socket->state
.bound_streaming
.streams);
} else {
streams = &(
socket->state.connected
.streams);
}
if ((pollfd->events & POLLRDNORM) !=
0) {
states[state_index++] = (state_t){
.pollable =
streams->incoming_pollable,
.pollfd = pollfd,
.entry = entry,
.events = POLLRDNORM
};
}
if ((pollfd->events & POLLWRNORM) !=
0) {
states[state_index++] = (state_t){
.pollable =
streams->outgoing_pollable,
.pollfd = pollfd,
.entry = entry,
.events = POLLWRNORM
};
}
break;
}
default:
errno = ENOTSUP;
return -1;
}
break;
}
default:
errno = ENOTSUP;
return -1;
}
} else {
abort();
}
}
if (event_count > 0 && timeout != 0) {
return event_count;
}
poll_borrow_pollable_t pollables[state_index + 1];
for (size_t i = 0; i < state_index; ++i) {
pollables[i] = poll_borrow_pollable(states[i].pollable);
}
poll_own_pollable_t timeout_pollable;
size_t pollable_count = state_index;
if (timeout >= 0) {
timeout_pollable = monotonic_clock_subscribe_duration(
((monotonic_clock_duration_t)timeout) * 1000000);
pollables[pollable_count++] =
poll_borrow_pollable(timeout_pollable);
}
wasip2_list_u32_t ready;
poll_list_borrow_pollable_t list = {
.ptr = (poll_borrow_pollable_t *)&pollables,
.len = pollable_count
};
poll_poll(&list, &ready);
for (size_t i = 0; i < ready.len; ++i) {
size_t index = ready.ptr[i];
if (index < state_index) {
state_t *state = &states[index];
if (state->entry->tag ==
DESCRIPTOR_TABLE_ENTRY_TCP_SOCKET &&
state->entry->tcp_socket.state.tag ==
TCP_SOCKET_STATE_CONNECTING) {
tcp_socket_t *socket =
&(state->entry->tcp_socket);
tcp_borrow_tcp_socket_t borrow =
tcp_borrow_tcp_socket(socket->socket);
tcp_tuple2_own_input_stream_own_output_stream_t
tuple;
tcp_error_code_t error;
if (tcp_method_tcp_socket_finish_connect(
borrow, &tuple, &error)) {
streams_borrow_input_stream_t
input_stream_borrow =
streams_borrow_input_stream(
tuple.f0);
streams_own_pollable_t input_pollable =
streams_method_input_stream_subscribe(
input_stream_borrow);
streams_borrow_output_stream_t
output_stream_borrow =
streams_borrow_output_stream(
tuple.f1);
streams_own_pollable_t output_pollable =
streams_method_output_stream_subscribe(
output_stream_borrow);
socket->state =
(tcp_socket_state_t){ .tag = TCP_SOCKET_STATE_CONNECTED,
.connected = {
.input_pollable =
input_pollable,
.input =
tuple.f0,
.output_pollable =
output_pollable,
.output =
tuple.f1,
} };
if (state->pollfd->revents == 0) {
++event_count;
}
state->pollfd->revents |= state->events;
} else if (error ==
NETWORK_ERROR_CODE_WOULD_BLOCK) {
// No events yet -- application will need to poll again
} else {
socket->state =
(tcp_socket_state_t){ .tag = TCP_SOCKET_STATE_CONNECT_FAILED,
.connect_failed = {
.error_code =
error,
} };
if (state->pollfd->revents == 0) {
++event_count;
}
state->pollfd->revents |= state->events;
}
} else {
if (state->pollfd->revents == 0) {
++event_count;
}
state->pollfd->revents |= state->events;
}
}
}
wasip2_list_u32_free(&ready);
if (timeout >= 0) {
poll_pollable_drop_own(timeout_pollable);
}
return event_count;
}
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