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- the epoll backend is no longer limited to 2 event handlers
per low level fd.
- finally add support for TEVENT_FD_ERROR
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
Autobuild-User(master): Ralph Böhme <slow@samba.org>
Autobuild-Date(master): Fri Oct 13 10:45:51 UTC 2023 on atb-devel-224
After 12 years we finally got TEVENT_FD_ERROR support :-)
TEVENT_FD_WRITE event handlers never get errors reported
instead the event handler is silently disabled.
There are likely callers relying on that behavior, so
we are not able to chance it.
Now TEVENT_FD_WRITE can be used together with TEVENT_FD_ERROR
in order to get errors reported without waiting for TEVENT_FD_READ.
TEVENT_FD_ERROR can also be used alone in order to detect errors
on sockets in order to cleanup resources.
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
The tests the interaction of multiple event handlers on
the same low level fd.
It shows that poll and epoll backends behave in the
same fair way.
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
This allows any number of event handlers per low level fd.
It means the epoll backend behaves like the poll backend now.
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
Backends may require to map individual tevent_fd instances to
a single low level kernel state (e.g. for epoll).
This generic infrastructure adds helper functions using
a generic (sub)part of struct tevent_fd.
The new code will allow us to support more than 2 tevent_fd
instances per fd, which makes sure all backends can provide
a similar behavior. This will be important when we add
TEVENT_FD_ERROR as a 3rd kind of fd event.
The aim is to use this in order to replace the limited implementation
we already have in tevent_epoll.c.
As these helpers are typically called from within
'void tevent_fd_set_flags(struct tevent_fd *fde, uint16_t flags)'
there's no way to report errors. So in order avoid additional
error handling complexity the helpers try to avoid
any allocations which may fail. It also means the logic in
tevent_epoll.c doesn't have to change much.
These are implemented as static line functions in order to avoid
the function call overhead, which showed up in profiles of the
early implementation.
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
It means tevent_trace_fd_callback(TEVENT_EVENT_TRACE_DETACH)
is always called and similar future changes are only
needed in one place.
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
It turns out that the overhead of DLIST_DEMOTE() implemented
as DLIST_REMOVE();DLIST_ADD_END(), is very high if the list
contains only 1 or 2 elements.
The next commits will make use of DLIST_DEMOTE_SHORT() for
multiplexing multiple tevent_fd structures for a single fd
and the most important and common case is a list with just
one element.
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
‘id’ is an unsigned variable, and so it can never be less than zero.
Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
Commit 6b4d94c9877ec59081b9da946c00fa2647cad928 was a previous attempt
to fix this issue.
Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
The rpcecho server is useful in development and testing, but should never
have been allowed into production, as it includes the facility to
do a blocking sleep() in the single-threaded rpc worker.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=15474
Signed-off-by: Andrew Bartlett <abartlet@samba.org>
‘tm’ must be initialized prior to calling strptime().
Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
There is a borderline case where a conditional ACE unicode string
becomes longer than the SDDL parser wants to handle when control
characters are given canonical escaping. This can make the round trip
fail, but it isn't really a problem.
Signed-off-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
Now that access_check.c includes headers for conditional ACEs, the patch
should take that into account.
Also, we check for a talloc failure.
Signed-off-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
This parses the blob as a conditional ACE, and if possible tries
decompiling it into SDDL.
There are not many round-trip assertions we can honestly make, but we
keep the trip going as long as possible, in case it reveals anything.
Signed-off-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
Here we're not compiling the whole SD, just the single conditional
ACE.
Signed-off-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
This implementation is no longer called: using a variable of static
storage duration as a conduit for return values is only asking for
trouble.
Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
This implementation doesn’t rely on a variable of static storage
duration being used as a conduit for the return value.
Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
For now this function is a mere wrapper round krb5_princ_component(),
but one whose interface allows for a more sensible implementation.
Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
