On Monday, 13 September 2021 at 17:18:30 UTC, eugene wrote:
Then after pressing ^C (SIGINT) the program gets SIGSEGV, since
references to sg0 and sg1 are no longer valid (they are
"sitting" in epoll_event structure).
engine/ecap.d(54): Error: field `EpollEvent.es` cannot assign to
misaligned pointers in `@safe` code
engine/ecap.d(56): Error: cannot take address of local `e` in
`@safe` function `registerEventSource`
from adding @safe to ecap.EventQueue.registerEventSource, and
then from using a @trusted block to silence the first complaint.
Instead of using a temporary EpollEvent array in EventQueue.wait,
you could make the array an instance variable and have
registerEventSource populate it directly, so that the GC can
always trace from this array to an EnventSource.
... however, I don't think this fixes your problem, or is your
only problem, since the segfault's still observed when this
memory is leaked:
```d
void registerEventSource(EventSource es) {
import core.memory : pureMalloc, GC;
auto p = cast(EpollEvent*) pureMalloc(EpollEvent.sizeof);
p.event_mask = 0;
p.es = es;
GC.addRoot(p);
int r = epoll_ctl(id, EPOLL_CTL_ADD, es.id, p);
assert(r == 0, "epoll_ctl(ADD) failed");
}
```
