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Refactor existing code from tools/lvmcmdline.c to
libdaemon/server/daemon-stray.h daemon_close_stray_fds()
used to close stray descriptors above some specified Fd.
This is code parses content of /proc dir to minimize 'blind' closing
of all possible descriptors within rlimits range.
As we have the same code in few other places in it's more 'trivial'
version - these were actually sensitive to high amount of descriptors,
which might be configured on some system.
With this patch we effectively resolve this reported gitlab issue:
https://gitlab.com/lvmteam/lvm2/-/issues/5
TODO: Current placement might not be ideal - however considering
existing code base constrains it's not so simple.
ATM it uses lib/misc/lvm-file.h for custom_fds declaration
and rest of functinality is included in daemon header file.
To avoid tiny race on checking arrival of signal and entering select
(that can latter remain stuck as signal was already delivered) switch
to use pselect().
If it would needed, we can eventually add extra code for older systems
without pselect(), but there are probably no such ancient systems in
use.
Ensure configure.h is always 1st. included header.
Maybe we could eventually introduce gcc -include option, but for now
this better uses dependency tracking.
Also move _REENTRANT and _GNU_SOURCE into configure.h so it
doesn't need to be present in various source files.
This ensures consistent compilation of headers like stdio.h since
it may produce different declaration.
As we start refactoring the code to break dependencies (see doc/refactoring.txt),
I want us to use full paths in the includes (eg, #include "base/data-struct/list.h").
This makes it more obvious when we're breaking abstraction boundaries, eg, including a file in
metadata/ from base/
ATM we have several instances of daemonizing code.
Each has its 'special' logic so not completely easy
to unify them all into a single routine.
Start to unify them and use one strategy for rediricting
all input/outpus to /dev/null - use 'dup2' function for this
and open /dev/null before fork to make sure it's available.
Some archs can use even 64K pages and then lvm2 runs into trouble if
the stack is 'too small' to fit extra page capturing stack overwrite.
So when lvm2 limits stack - add extra mem page - be it 4K or 64K.
Relates to ppc64le bug: https://bugzilla.redhat.com/1387279
Currently, a shutdown signal will cause lvmetad to quit
responding to new connections, but not actually exit until
all connections are gone. If a program is maintaining a
long running connection (e.g. lvmlockd, or even an lvm
command) when lvmetad gets a shutdown signal, then all
further commands will hang indefinately waiting for a
response that won't be sent.
With this patch, make lvmetad continue handling new
connections even after a shutdown signal. It will exit
once all connections are gone.
works with systemd activated daemons only as of now
each daemon implementation may decide to signalize its
internal idle state (i.e. all background tasks unrelated to
client threads are finished)
all sockets opened by a daemon or handed over by systemd
have to have CLOEXEC flag set. Otherwise we get nasty
warnings about leaking descriptors in processes spawned by
daemon.
Ensure daemon-io.h is used as a generic header included
with configure defines before other headers.
(In future all lvm2 libraries should settle on a single lib.h header)
Rename couple defines to better match header file names.
Make it easier to run a live lvmetad in debugging mode and
to avoid conflicts if multiple test instances need to be run
alongside a live one.
No longer require -s when -f is used: use built-in default.
Add -p to lvmetad to specify the pid file.
No longer disable pidfile if -f used to run in foreground.
If specified socket file appears to be genuine but stale, remove it
before use.
On error, only remove lvmetad socket file if created by the same
process. (Previous code removes socket even while a running instance
is using it!)
