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async: Remove old fds in epoll instance

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Lorenz Stechauner
2026-06-05 11:15:00 +02:00
parent a240bb7e48
commit 2ab342f721
1 changed files with 20 additions and 6 deletions
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src/async.c
+20 -6
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@@ -25,6 +25,7 @@
typedef struct {
int fd;
int list_idx;
sock *socket;
async_evt_t events;
int flags;
@@ -208,6 +209,7 @@ static int async_add(evt_listen_t *evt) {
int async_fd(int fd, async_evt_t events, int flags, void *arg, void cb(void *), void to_cb(void *), void err_cb(void *)) {
evt_listen_t evt = {
.fd = fd,
.list_idx = -1,
.socket = NULL,
.events = events,
.flags = flags,
@@ -222,6 +224,7 @@ int async_fd(int fd, async_evt_t events, int flags, void *arg, void cb(void *),
int async(sock *s, async_evt_t events, int flags, void *arg, void cb(void *), void to_cb(void *), void err_cb(void *)) {
evt_listen_t evt = {
.fd = s->socket,
.list_idx = -1,
.socket = s,
.events = events,
.flags = flags,
@@ -289,6 +292,7 @@ void async_thread(void) {
// fill local list and epoll instance with previously added queue entries
for (int i = 0; i < l->n; i++) {
evt_listen_t *evt = l->q[i];
evt->list_idx = list_size(local);
local = list_append(local, &evt);
if (local == NULL) {
critical("Unable to resize async local list");
@@ -303,14 +307,21 @@ void async_thread(void) {
// fd already exists, delete old one
warning("Unable to add file descriptor to epoll instance");
errno = 0;
if (epoll_ctl(epoll_fd, EPOLL_CTL_DEL, evt->fd, NULL) != -1)
if (epoll_ctl(epoll_fd, EPOLL_CTL_DEL, evt->fd, NULL) != -1) {
local = list_remove(local, evt->list_idx);
if (local == NULL) {
critical("Unable to resize async local list");
return;
}
notice("Removed old file descriptor from epoll instance");
continue;
}
} else if (errno == EBADF || errno == EPERM) {
// fd probably already closed or does not support epoll somehow
// FIXME should not happen
warning("Unable to add file descriptor to epoll instance");
errno = 0;
local = list_delete(local, &evt);
local = list_remove(local, evt->list_idx);
if (local == NULL) {
critical("Unable to resize async local list");
return;
@@ -328,7 +339,7 @@ void async_thread(void) {
// calculate wait timeout
min_ts = -1000, cur_ts = clock_micros();
for (int i = 0; i < list_size(local); i++) {
evt_listen_t *evt = local[i];
const evt_listen_t *evt = local[i];
if (!evt->socket || evt->socket->timeout_us < 0) continue;
ts = evt->socket->ts_last + evt->socket->timeout_us - cur_ts;
@@ -349,7 +360,10 @@ void async_thread(void) {
for (int i = 0; i < num_fds; i++) {
evt_listen_t *evt = events[i].data.ptr;
if (!list_contains(local, &evt)) continue;
if (evt != local[evt->list_idx]) {
error("epoll instance reported event not contained in local list");
continue;
}
void (*cb)(void *) = NULL;
if (async_exec_cb(evt, async_e2a(events[i].events), &cb) == 0) {
@@ -364,7 +378,7 @@ void async_thread(void) {
}
}
local = list_delete(local, &evt);
local = list_remove(local, evt->list_idx);
if (local == NULL) {
critical("Unable to resize async local list");
return;
@@ -381,7 +395,7 @@ void async_thread(void) {
// check, if some socket ran into a timeout
cur_ts = clock_micros();
for (int i = 0; i < list_size(local); i++) {
evt_listen_t *evt = local[i];
const evt_listen_t *evt = local[i];
if (!evt->socket) continue;
if (evt->socket->timeout_us >= 0 && (cur_ts - evt->socket->ts_last) >= evt->socket->timeout_us) {