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Move static to main() local vars.
Initilize libdm logging also before starting _restart_dmeventd()
so function there can be also logged.
Move call of _info_dmevent() out of option processing - so some
options like -V are processed with higher priority.
Use _restart_dmeventd() with return values 0,1,2.
Also let's use already created fifos struct.
Make sure the _systemd_activation variable is properly initialized
from _systemd_handover before calling _restart_dmeventd() as
this variable is used there to decide where 1 or 2 should
be returned - aka either letting systemd to initilize
or restart dmeventd itself.
Before initiation fifo communication, check whether there is
running dmeventd - in case there is no running instance, this
would be just blocked for 5 seconds trying to open fifo.
Fix cutting away 1 character via incorrect usage of dm_strncpy
introduced in last batch of commits and use sizeof(buffer) to
get proper sizes.
In case of use strcpy_name_len() the replacement was invalid,
so we need to restore this case since sanlock uses buffer without
nul ending, so we would strip one more character from the buffer.
Also start to use dm_strncpy() without (void) for unchecked usage.
Add a global timeout value to be used for the threads to end waiting for
whatever it is they are blocked on. The values varied from 2-5 seconds,
which is way longer than needed. Value of 0.5 shows no CPU load when
service is running and is idle.
When exit on file is present in a system and term/break signal is
catched, them dmeventd is no longger refusing to exit.
For the correct shutdown, there should be ideally unmonitoring call,
however in some case it's very hard to implement this correct procedure.
With this 'exit on' file dmeventd at least avoid 'blocking' shutdown,
before systemd kills use with -9 anyway possibly even in some unwanted
stated of internal dmeventd processing (i.e. in the middle of some lvm
command processing).
To quickly get info about some internal dmeventd status,
implment 'dmeventd -i' support.
Reported messages are some 'raw' internal informations mainly
useful to developers.
Instead of just exiting in the middle of monitoring,
unregisted all monitored devices first and then exit.
To speedup this path, all send internal SIGINT when thread
unregiters itself, to wakup-up main sleeping loop.
If we want to have const structure - use a const pointer to avoid,
however making individual members const make it only assingle
in construct time and we already violate this logic since
we memcpy into the structure - so drop these unnecessary consts...
syscall 186 is specific to x86 64bit. As this is different from arch
to arch and between same arch different arch size we will only grab
thread ID using built-in python support if it is supported.
Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=2166931
