If wpa_supplicant exposes its DBus interface, multiple calls to
eloop_register_sock are potentially made in dbus_common.c add_watch().
epoll_ctl(..., EPOLL_CTL_ADD, ...) returns EEXIST if called multiple
times with the same file descriptor argument. Therefore wpa_supplicant
may misses DBus events.
The corresponding source code is:
eloop_register_sock(fd, EVENT_TYPE_EXCEPTION, process_watch_exception,
priv, watch);
if (flags & DBUS_WATCH_READABLE) {
eloop_register_sock(fd, EVENT_TYPE_READ, process_watch_read,
priv, watch);
}
if (flags & DBUS_WATCH_WRITABLE) {
eloop_register_sock(fd, EVENT_TYPE_WRITE, process_watch_write,
priv, watch);
}
The error message I noticed is:
Feb 25 22:00:45 isengard wpa_supplicant[18388]: eloop_sock_queue:
epoll_ctl(ADD) for fd=4 failed: File exists
One possible fix would be to let the epoll code check if other events
are already registered for the same file descriptor and call
EPOLL_CTL_MOD in this case.
Markus
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