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This is primarily useful for debugging, but can be useful for other
purposes too. For example userspace could check whether "auto-windows"
is included in the list, before triggering a boot-into-windows
operation.
The field derives from a file name only in very specific cases, for
many cases it's a fixed string (for example, all "auto-" items are like
this). Also, even when it derives from a file name, it is processed a
bit, as suffixes are removed and the string is converted to lower case.
hence, let's name this field "id" instead, because that's what it is
used for: as general identification token.
Firmware implementations are generally pretty bad, hence let's better
add an explicit check for NULL before invokin FreePool(), in particular
is it doesn't appear to be documented whether FreePool() is supposed to
be happy with NULL.
This updates the unit files of all our serviecs that deal with journal
stuff to use a higher RLIMIT_NOFILE soft limit by default. The new value
is the same as used for the new HIGH_RLIMIT_NOFILE we just added.
With this we ensure all code that access the journal has higher
RLIMIT_NOFILE. The code that runs as daemon via the unit files, the code
that is run from the user's command line via C code internal to the
relevant tools. In some cases this means we'll redundantly bump the
limits as there are tools run both from the command line and as service.
Following the discussions with the kernel folks, let's substantially
increase the hard limit (but not the soft limit) of RLIMIT_NOFILE to
256K for all services we start.
Note that PID 1 itself bumps the limit even further, to the max the
kernel allows. We can deal with that after all.
This makes use of rlimit_nofile_bump() in all tools that access the
journal. In some cases this replaces older code to achieve this, and
others we add it in where it was missing.
Following discussions with some kernel folks at All Systems Go! it
appears that file descriptors are not really as expensive as they used
to be (both memory and performance-wise) and it should thus be OK to allow
programs (including unprivileged ones) to have more of them without ill
effects.
Unfortunately we can't just raise the RLIMIT_NOFILE soft limit
globally for all processes, as select() and friends can't handle fds
>= 1024, and thus unexpecting programs might fail if they accidently get
an fd outside of that range. We can however raise the hard limit, so
that programs that need a lot of fds can opt-in into getting fds beyond
the 1024 boundary, simply by bumping the soft limit to the now higher
hard limit.
This is useful for all our client code that accesses the journal, as the
journal merging logic might need a lot of fds. Let's add a unified
function for bumping the limit in a robust way.
This simply adds a new constant we can use for bumping RLIMIT_NOFILE to
a "high" value. It default to 256K for now, which is pretty high, but
smaller than the kernel built-in limit of 1M.
Previously, some tools that needed a higher RLIMIT_NOFILE bumped it to
16K. This new define goes substantially higher than this, following the
discussion with the kernel folks.
