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If the event context got deleted, tevent_fd_get_flags() will return 0
for the stale fde. In that case we should not use fde_ev->ev anymore.
Pair-Programmed-With: Stefan Metzmacher <metze@samba.org>
Signed-off-by: Ralph Boehme <slow@samba.org>
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Volker Lendecke <vl@samba.org>
This factors out the traversal function from _wipe. It will be used to
replace message_send_all soon.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
In the wake of bug 13150 we've discussed that this could happen even
without clustering. This adds code to make sure that whenever messaging
is used the pid and the files used match.
It's pretty heavy-weight, thus I made it DEVELOPER only. My gut feeling
is that the getsockname is cheap, but the stat call might be a bit too
expensive.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
FreeBSD does not do the nice blocking send that Linux does. Instead,
it returns ENOBUFS if the dst socket is full. According to the
manpage you have to do polling. Try with exponential backoff, at
the end try once a second forever.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
Autobuild-User(master): Jeremy Allison <jra@samba.org>
Autobuild-Date(master): Tue Jun 20 23:03:11 CEST 2017 on sn-devel-144
According to susv4 sendmsg, NOSIGAL is effective for stream-oriented sockets.
Datagram sockets won't send SIGPIPE anyway. Looking at Linux kernel sources,
this is only looked at in stream functions. I guess this is a left-over from my
tmsgd attempts, which was based on stream sockets. messaging_dgm still only
uses datagram sockets, so MSG_NOSIGNAL is not needed here.
Bug: https://bugzilla.samba.org/show_bug.cgi?id=12502
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
Autobuild-User(master): Ralph Böhme <slow@samba.org>
Autobuild-Date(master): Tue May 30 16:39:12 CEST 2017 on sn-devel-144
We are trying to put something that (in theory) could be 109 bytes
long, into the sockaddr_un.sun_path field which has a fixed size of
108 bytes. The "in theory" part is that one of the components is a
pid, which although stored as 32 bits is in practice 16 bits, so the
maximum size is not actually hit.
This is all very annoying, because the length is checked anyway and
all this achieves is silencing a warning.
Reviewed-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
Autobuild-User(master): Andrew Bartlett <abartlet@samba.org>
Autobuild-Date(master): Fri Feb 10 09:05:31 CET 2017 on sn-devel-144
Only one tevent_fd is possible for every file descriptor.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
Instead, rely on messaging_dgm_ref to always request a tevent_handle.
Signed-off-by: Volker Lendecke <vl@samba.org>
Pair-Programmed-With: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
We might be called from different event contexts and thus
via different fde's
Signed-off-by: Volker Lendecke <vl@samba.org>
Pair-Programmed-With: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
This itself adds a lot of code, however it removes the unix_msg library.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
Autobuild-User(master): Jeremy Allison <jra@samba.org>
Autobuild-Date(master): Tue Aug 23 10:46:17 CEST 2016 on sn-devel-144
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Andreas Schneider <asn@samba.org>
Autobuild-User(master): Jeremy Allison <jra@samba.org>
Autobuild-Date(master): Sat Aug 20 09:41:33 CEST 2016 on sn-devel-144
There might be situations where the lock directory moves to a
location where a previous installation left the datagram sockets
(Yes, I just came across this). We can't really deal with it except
by just removing the socket without properly checking.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
Autobuild-User(master): Jeremy Allison <jra@samba.org>
Autobuild-Date(master): Thu Oct 22 02:14:29 CEST 2015 on sn-devel-104
To be able to read, we need to open the lockfile O_RDWR instead of O_WRONLY
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
"pid" and "sock" are sufficient I guess as randomizers to distinguish messages.
In theory, a pid could be recycled very quickly, which might mix up in-flight
messages. But once a few messages have passed, "cookie" would be incremented as
another indicator of a fresh message.
Why? Remove messages_dgm dependency on samba-util
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
When we want to use messages_dgm in source4, we need to find better
places for the lock and socket directories. Source4 does not have the
concept of a cache directory. So I chose "private dir"/sock and "lock
dir"/msg as subdirectories.
This moves directory creation from messages_dgm.c to messages.c,
source4/lib/messaging will have its own way of doing this.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
We have only one context per pid, so messaging_dgm_init can do getpid()
itself.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
This allows the callback to consume the fds and e.g. set
them to -1 so that the caller can then treat (close) only those
fds that have not been consumed.
Signed-off-by: Michael Adam <obnox@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Volker Lendecke <vl@samba.org>
Pair-Programmed-With: Stefan Metzmacher <metze@samba.org>
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Signed-off-by: Michael Adam <obnox@samba.org>
In order to receive the fd array the caller needs to use
messaging_filtered_read_send/recv(). For all higher level
methods we silently close/ignore the fd array.
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Michael Adam <obnox@samba.org>
Pair-Programmed-With: Stefan Metzmacher <metze@samba.org>
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Signed-off-by: Michael Adam <obnox@samba.org>
Right now we can only support one messaging_dgm_context per process
anyway, the code has checks for this. I would like to keep it that
way, in the future we will have multiple messaging_context's or
imessaging_context's filtering based upon the dst server_id.
Why this change? messaging_dgm's lockfile contains the
serverid->unique_id. When designing messaging_dgm, I had in mind to
remove the serverid.tdb and replace it with the dgm lockfiles for server
lookup and enumeration. I have a WIP-patchset that gets rid of almost
all users of serverid.tdb. The problem is serverid_exists. Here we don't
have a messaging_context available, and it would be pretty intrusive
to make it so. This problem has plagued us since ctdb was developed,
see for example the comment
/*
* This is a Samba3 hack/optimization. Routines like process_exists need to
* talk to ctdbd, and they don't get handed a messaging context.
*/
in messaging_ctdb.c. This patchset removes this problem in a radical way:
Treat the messaging_dgm context as one globally available structure and
be done with it. The ctdb socket could go the same way in the future.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
Autobuild-User(master): Stefan Metzmacher <metze@samba.org>
Autobuild-Date(master): Sun Sep 14 16:29:30 CEST 2014 on sn-devel-104
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
Autobuild-User(master): Jeremy Allison <jra@samba.org>
Autobuild-Date(master): Fri Aug 22 05:20:43 CEST 2014 on sn-devel-104
... much nicer than PRIu64
Also, append a \n. Makes it better readable when looking at the lockfile
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
This makes messages_dgm a simple byte-transport across processes that
knows almost nothing about server_id etc.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
