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Track the number of matches installed for a given multicast group, and leave the
group once no matches depend on it.
In order to handle passed-in sockets that are already members of multicast groups
we initialize the refcount based on the membership once we take over the socket.
This way we will leave the socket in the state we found it once we finish with
it.
On kernels that do not fully support reading out the multicast group membership
we fall back to never leaving any groups (as before).
If SMACK is enabled, 'smackfsroot=*' option should be specified in
tmp.mount file since many non-root processes use /tmp for temporary
usage. If not, /tmp is labeled as '_' and smack denial occurs when
writing.
--enable-lz4 can be used to force lz4 requirement,
--disable-lz4 can be used to skip lz4 support even if available.
Also, make surrounding checks for bzip2, xz, and zlib similar in structure.
This fixes the check for requested but missing bzip2.
Logging for compression and decompression is assymetrical on purpose:
if compiled without some type of compression, those compression code
paths should never be invoked. OTOH, it is possible to encounter
unsupported format on decompression, so leave those log_debug statements
in, to make it easier to diagnose stuff.
When the Suspend method is called, the only log message we write
(unless debugging is enabled) is "Operation finished.". This is
not very helpful when trying to figure out what is going on, so
add what operation we are talking about to the message:
"Operation 'sleep' finished.".
Hat tip to Daniel Aleksandersen for pointing this out.
Normally this shouldn't happen unless the daemon is reloaded.
A similar check is already in place in socket.c for the socket
activation case.
This hopefully makes #1526 non-fatal, though it will not fix this, and
there's something else to fix.
The intent of the assignments around the check for libcap was obviously
to avoid polluting LIBS. To work properly, LIBS must be restored from
the save_LIBS variable.
The practical effect is small though, because pretty much everything
links with libbasic, which links with CAP_LIBS.
We have two AC_CHECK_LIB checks for libdw. The first one has an empty
action-if-found, so it defaults to adding "-ldw" to LIBS. LIBS are
applied to everything we build. But only systemd-coredump needs libdw.
It already links to ELFUTILS_LIBS correctly in Makefile.am.
Drop the first AC_CHECK_LIB check. The second check is sufficient.
Q: Don't we already use "-Wl,--as-needed" to eliminate overlinking?
A: We do, but it is effective only for executables, not for shared
libraries. This is due to a libtool bug:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=347650
