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sd-event: don't allocate event queue array on stack 

We might have quite a number of event sources, hence allocate this in a
buffer we can reuse on the heap, rather than on the stack.
This commit is contained in:
Lennart Poettering 2019-12-18 10:59:27 +01:00
parent ac6431dad9
commit 5cddd924aa
1 changed files with 20 additions and 15 deletions
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35
src/libsystemd/sd-event/sd-event.c
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@ -115,6 +115,9 @@ struct sd_event {
unsigned n_sources;
struct epoll_event *event_queue;
size_t event_queue_allocated;
LIST_HEAD(sd_event_source, sources);
usec_t last_run, last_log;
@ -286,6 +289,8 @@ static sd_event *event_free(sd_event *e) {
hashmap_free(e->child_sources);
set_free(e->post_sources);
free(e->event_queue);
return mfree(e);
}
@ -3477,8 +3482,7 @@ pending:
}
_public_ int sd_event_wait(sd_event *e, uint64_t timeout) {
struct epoll_event *ev_queue;
unsigned ev_queue_max;
size_t event_queue_max;
int r, m, i;
assert_return(e, -EINVAL);
@ -3492,14 +3496,15 @@ _public_ int sd_event_wait(sd_event *e, uint64_t timeout) {
return 1;
}
ev_queue_max = MAX(e->n_sources, 1u);
ev_queue = newa(struct epoll_event, ev_queue_max);
event_queue_max = MAX(e->n_sources, 1u);
if (!GREEDY_REALLOC(e->event_queue, e->event_queue_allocated, event_queue_max))
return -ENOMEM;
/* If we still have inotify data buffered, then query the other fds, but don't wait on it */
if (e->inotify_data_buffered)
timeout = 0;
m = epoll_wait(e->epoll_fd, ev_queue, ev_queue_max,
m = epoll_wait(e->epoll_fd, e->event_queue, event_queue_max,
timeout == (uint64_t) -1 ? -1 : (int) DIV_ROUND_UP(timeout, USEC_PER_MSEC));
if (m < 0) {
if (errno == EINTR) {
@ -3515,26 +3520,26 @@ _public_ int sd_event_wait(sd_event *e, uint64_t timeout) {
for (i = 0; i < m; i++) {
if (ev_queue[i].data.ptr == INT_TO_PTR(SOURCE_WATCHDOG))
r = flush_timer(e, e->watchdog_fd, ev_queue[i].events, NULL);
if (e->event_queue[i].data.ptr == INT_TO_PTR(SOURCE_WATCHDOG))
r = flush_timer(e, e->watchdog_fd, e->event_queue[i].events, NULL);
else {
WakeupType *t = ev_queue[i].data.ptr;
WakeupType *t = e->event_queue[i].data.ptr;
switch (*t) {
case WAKEUP_EVENT_SOURCE: {
sd_event_source *s = ev_queue[i].data.ptr;
sd_event_source *s = e->event_queue[i].data.ptr;
assert(s);
switch (s->type) {
case SOURCE_IO:
r = process_io(e, s, ev_queue[i].events);
r = process_io(e, s, e->event_queue[i].events);
break;
case SOURCE_CHILD:
r = process_pidfd(e, s, ev_queue[i].events);
r = process_pidfd(e, s, e->event_queue[i].events);
break;
default:
@ -3545,20 +3550,20 @@ _public_ int sd_event_wait(sd_event *e, uint64_t timeout) {
}
case WAKEUP_CLOCK_DATA: {
struct clock_data *d = ev_queue[i].data.ptr;
struct clock_data *d = e->event_queue[i].data.ptr;
assert(d);
r = flush_timer(e, d->fd, ev_queue[i].events, &d->next);
r = flush_timer(e, d->fd, e->event_queue[i].events, &d->next);
break;
}
case WAKEUP_SIGNAL_DATA:
r = process_signal(e, ev_queue[i].data.ptr, ev_queue[i].events);
r = process_signal(e, e->event_queue[i].data.ptr, e->event_queue[i].events);
break;
case WAKEUP_INOTIFY_DATA:
r = event_inotify_data_read(e, ev_queue[i].data.ptr, ev_queue[i].events);
r = event_inotify_data_read(e, e->event_queue[i].data.ptr, e->event_queue[i].events);
break;
default: