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detect kqueue bug in Mac OS X 10.4; from Nick Mathewson

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svn:r165
This commit is contained in:
Niels Provos 2005-05-11 03:34:42 +00:00
parent 145c11fd6d
commit 57fafe6b5f
1 changed files with 21 additions and 0 deletions
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21
kqueue.c
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@ -122,6 +122,27 @@ kq_init(void)
}
kqueueop->nevents = NEVENT;
/* Check for Mac OS X kqueue bug. */
kqueueop->changes[0].ident = -1;
kqueueop->changes[0].filter = EVFILT_READ;
kqueueop->changes[0].flags = EV_ADD;
/*
* If kqueue works, then kevent will succeed, and it will
* stick an error in events[0]. If kqueue is broken, then
* kevent will fail.
*/
if (kevent(kq,
kqueueop->changes, 1, kqueueop->events, NEVENT, NULL) != 1 ||
kqueueop->events[0].ident != -1 ||
kqueueop->events[0].flags != EV_ERROR) {
event_warn("%s: detected broken kqueue; not using.", __func__);
free(kqueueop->changes);
free(kqueueop->events);
free(kqueueop);
close(kq);
return (NULL);
}
return (kqueueop);
}