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Martin Schwenke dc7b48c404 ctdb-common: Set immediate mode for pcap capture 
Fix a problem where ctdb_killtcp (almost always) fails to capture
packets with --enable-pcap and libpcap ≥ 1.9.1.  The problem is due to
a gradual change in libpcap semantics when using
pcap_get_selectable_fd(3PCAP) to get a file descriptor and then using
that file descriptor in non-blocking mode.

pcap_set_immediate_mode(3PCAP) says:

  pcap_set_immediate_mode() sets whether immediate mode should be set
  on a capture handle when the handle is activated.  In immediate
  mode, packets are always delivered as soon as they arrive, with no
  buffering.

and

  On Linux, with previous releases of libpcap, capture devices are
  always in immediate mode; however, in 1.5.0 and later, they are, by
  default, not in immediate mode, so if pcap_set_immediate_mode() is
  available, it should be used.

However, it wasn't until libpcap commit
2ade7676101366983bd4f86bc039ffd25da8c126 (before libpcap 1.9.1) that
it became a requirement to use pcap_set_immediate_mode(), even with a
timeout of 0.

More explanation in this libpcap issue comment:

  https://github.com/the-tcpdump-group/libpcap/issues/860#issuecomment-541204548

Do a configure check for pcap_set_immediate_mode() even though it has
existed for 10 years.  It is easy enough.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=15451

Signed-off-by: Martin Schwenke <mschwenke@ddn.com>
Reviewed-by: Amitay Isaacs <amitay@gmail.com>

Autobuild-User(master): Amitay Isaacs <amitay@samba.org>
Autobuild-Date(master): Tue Aug 15 10:53:52 UTC 2023 on atb-devel-224
2023-08-15 10:53:52 +00:00
..
client ctdb:client: Fix code spelling 2023-03-24 07:01:31 +00:00
cluster ctdb-config: Add configuration option [cluster] leader timeout 2022-01-17 10:21:33 +00:00
common ctdb-common: Set immediate mode for pcap capture 2023-08-15 10:53:52 +00:00
config ctdb-scripts: Support script logging to stderr 2023-07-19 09:01:33 +00:00
database ctdb-database: Fix signed/unsigned comparison by casting 2019-07-05 05:03:24 +00:00
doc ctdb-doc: Fix documentation for ctdb event status 2023-08-07 09:43:33 +00:00
event ctdb-tools: Fix CID 1539212 - signed/unsigned issue 2023-08-07 08:43:39 +00:00
failover ctdb-failover: Add failover configuration options 2018-08-24 10:59:21 +02:00
ib ctdb-daemon: Rename ctdb_context private_data to transport_data 2019-11-14 02:20:46 +00:00
include ctdb:include: Fix code spelling 2023-03-24 07:01:31 +00:00
protocol ctdb-protocol: Add separator argument to ctdb_connection_to_buf() 2022-07-22 16:09:31 +00:00
server ctdb: Add missing newline to logging message 2023-08-08 04:39:37 +00:00
tcp ctdb:tcp: Fix code spelling 2023-03-24 07:01:31 +00:00
tests ctdb-tools: Fix CID 1539212 - signed/unsigned issue 2023-08-07 08:43:39 +00:00
tools ctdb: Do not use egrep 2023-07-19 09:01:33 +00:00
utils ctdb-utils: Drop unused scsi_io.c source file 2023-07-19 09:01:33 +00:00
.bzrignore
.gitignore ctdb-build: use a fixed ctdb_version.h using SAMBA_VERSION_STRING 2019-03-15 05:17:14 +00:00
configure configure/Makefile: export PYTHONHASHSEED=1 in all 'configure/Makefile' scripts 2022-03-29 22:32:32 +00:00
configure.rpm ctdb-packaging: Update library versions to upstream versions 2018-12-18 07:12:09 +01:00
COPYING
Makefile Python: remove pydoctor 2023-02-02 21:15:54 +00:00
README
wscript ctdb-common: Set immediate mode for pcap capture 2023-08-15 10:53:52 +00:00

README 

This is the release version of CTDB, a clustered implementation of TDB
database used by Samba and other projects to store temporary data.

This software is freely distributable under the GNU public license,
a copy of which you should have received with this software (in a file
called COPYING).

For documentation on CTDB, please visit CTDB website http://ctdb.samba.org.