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I mean, let's not miss out on this excellent opportunity to use
hyperlinks on terminals.
(Unfortunately not see unless you invoke 'systemd-analyze --no-pager
--help', because 'less' is so much stuck in the past :-(.)
If for some reason we do not know some signal, instead of silently
skipping it, let's print it numerically. Likewise, 'show' is not the
right place to do value filtering for exit codes. If pid1 accepted it,
let's just print it with no fuss.
We were passing 1/4th of the size in bytes as argument. So depending
on the size of the array, either we'd only transfer a subset of values,
or we'd get an alignment error.
With SYSTEMD_LOG_LOCATION=1, it is much more useful to see the location
where the call to bus_log_{parse,create}_error() was made, rather then
the one-line body of the helper function. Also, it's our internal code,
so having a one-line non-inline function doesn't make much sense anyway.
I opted to embed the Bitmap structure directly in the ExitStatusSet.
This means that memory usage is a bit higher for units which don't define
this setting:
Service changes:
/* size: 2720, cachelines: 43, members: 73 */
/* sum members: 2680, holes: 9, sum holes: 39 */
/* sum bitfield members: 7 bits, bit holes: 1, sum bit holes: 1 bits */
/* last cacheline: 32 bytes */
/* size: 2816, cachelines: 44, members: 73 */
/* sum members: 2776, holes: 9, sum holes: 39 */
/* sum bitfield members: 7 bits, bit holes: 1, sum bit holes: 1 bits */
But this way the code is simpler and we do less pointer chasing.
In situations where hibernation is requested but resume= and
resume_offset= kernel parameters are not configured, systemd
will attempt to locate a suitable swap location by inspecting
/proc/swaps. This change will use the first suitable swap with
the highest configured priority.
C's strerror() function does not return a "const char *" pointer
for the string. That has historic reasons and C99 even comments
that "[t]he array pointed to shall not be modified by the program".
Make the strerror_safe() wrapper correct this and be more strict
in this regard.
https://bugzilla.redhat.com/show_bug.cgi?id=1715699
> /dev/mapper/live-rw 6.4G 5.7G 648M 91% /
> systemd-journald[905]: Fixed min_use=1.0M max_use=648.7M max_size=81.0M min_size=512.0K keep_free=973.1M n_max_files=100
When journald is started, we pick keep_free as 15% of the disk size. When the
fs is almost filled, we will only keep one journal file around and rotate very
often (because min_size is very small).
Let's set min use to something reasonable, so that we get more useful logs that
will cover at least the full boot.
Some cases considered in the PR:
> /dev/mapper/live-rw 6.4G 5.7G 648M 91% /
keep_free→MIN(327,100)→100 MB.
min_use→16MB.
effective range: 16 MB – 548 MB
> /dev/mapper/fedora_krowka-root 78G 69G 5.7G 93% /
keep_free → MIN(4GB, 100MB)→100MB
min_use→16MB
effective range: 16 MB – 5.6 GB
(but then there's the max_use limit, which cuts the range down)
> 4TB, 4GB free
keep_free → MIN(209715, 100) → 100 MB
min_use→16MB
effective range: 16 MB – 4.9 GB
(also effectively limited by max_use)
Also replace unneeded width suffixes with spaces, I think this is more
readable, and drop DEFAULT_ prefixes in cases where this setting is
simply a bound, and cannot be overridden by user config, hence is not
a default.
