Latest glibc uses _Generic to have strstr() and other functions return
const char* or char* based on whether the input is a const char* or a
char*. This causes build failures as we previously always expected a
char*.
Let's fix the compilation failures and add our own macros similar to
glibc's to have string functions that return a mutable or const pointer
depending on the input.
Latest glibc uses _Generic to have strstr() and other functions return
const char* or char* based on whether the input is a const char* or a
char*. This causes build failures as we previously always expected a char*.
Let's fix the compilation failures and add our own macros similar to glibc's
to have string functions that return a mutable or const pointer depending on
the input.
Follow-up for 3ac4d68498
We have no sensible way to detect why strptime() fails, hence
the fallback path as it is now would fire on glibc systems too,
pointlessly. Let's guard it behind ifdeffery.
musl does not set tm_wday when it is explicitly requested.
The check is not necessary at all, it is just for safety.
Let's skip it when built with musl.
musl v1.2.5 does not support %z specifier in strptime(). Since
fced99e93d
%z is supported, but it only supports strict RFC-822/ISO 8601 format,
that is, 4 digits with sign (e.g. +0900 or -1400), but does not support
extended format: 2 digits or colon separated 4 digits (e.g. +09 or -14:00).
Let's add fallback logic to make it support the extended timezone spec.
glibc (and also musl, though we do not officially support it yet)
silently ignores colon prefix in $TZ. Let's always not prefix the
timezone.
tzset(3) states:
> A nonempty value of TZ can be one of two formats, either of which can
> be preceded by a colon which is ignored.
Addresses https://github.com/systemd/systemd/pull/38876#discussion_r2384347594.
Previously, an input string ends with short timezone spec e.g. WET,
was parsed by setting $TZ environment variable to the timezone.
But the timezone might be different from the original local timezone,
thus the result might not follow the timezone change in the original
local timezone.
This makes the check of the short timezone spec with tzname[] earlier,
then it is not necessary to load another timezone file for e.g. WET,
and provides expected time.
This also make it use SAVE_TIMEZONE macro and drop use of forking
process. This makes greatly improve performance when parsing string
that contains timezone different from the current local timezone.
Unfortunately, there is still one corner case that our test fails.
When tzdata is built with rearguard enabled, then at least
Africa/Windhoek timezone does not provide correct time, but time shifted
1 hour from the original.
Depending on the packaging of tzdata, /usr/share/zoneinfo/tzdata.zi may
reference zones or links that are not actually present on the system.
E.g. on Debian and Ubuntu, there is a tzdata-legacy package that
contains "legacy" zones and links, but they are still referenced in
/usr/share/zoneinfo/tzdata.zi shipped by the main tzdata package.
Right now, get_timezoes() does not validate timezones when building the
list, which makes the following possible:
$ timedatectl list-timezones | grep "US/Alaska"
US/Alaska
$ timedatectl set-timezone US/Alaska
Failed to set time zone: Invalid or not installed time zone 'US/Alaska'
which feels buggy. Hence, simply validate timezones in get_timezones()
to avoid listing timezones that are not installed.
Some configuration files that need updates are directly under in /etc. To
update them atomically, we need write access to /etc. For Ubuntu Core this is
an issue as /etc is not writable. Only a selection of subdirectories can be
writable. The general solution is symlinks or bind mounts to writable places.
But for atomic writes in /etc, that does not work. So Ubuntu has had a patch
for that that did not age well.
Instead we would like to introduce some environment variables for alternate
paths.
* SYSTEMD_ETC_HOSTNAME: /etc/hostname
* SYSTEMD_ETC_MACHINE_INFO: /etc/machine-info
* SYSTEMD_ETC_LOCALTIME: /etc/localtime
* SYSTEMD_ETC_LOCALE_CONF: /etc/locale.conf
* SYSTEMD_ETC_VCONSOLE_CONF: /etc/vconsole.conf
* SYSTEMD_ETC_ADJTIME: /etc/adjtime
While it is for now expected that there is a symlink from the standard, we
still try to read them from that alternate path. This is important for
`/etc/localtime`, which is a symlink, so we cannot have an indirect symlink or
bind mount for it.
Since machine-id is typically written only once and not updated. This commit
does not cover it. An initrd can properly create it and bind mount it.
Let's move some more implementation logic into functions. We keep
the logic that requires the macro in the macro and move the rest into
functions.
While we're at it, let's also make the parameter declarations of
all the string table macros less clausthrophobic.
We typically want to deal in usec_t, hence let's change the prototype
accordingly, and do proper range checks. Also, make sure are not
confused by negative times.
Do something similar for mktime_or_timegm().
This is a more comprehensive alternative to #34065
Replaces: #34065
Those functions take a pointer to a timestamp and return a timestamp pointer,
so the reader would be justified to think that those are just getters. Rename
them to avoid confusion.
Sometimes it makes sense to hard kill a client if we die. Let's hence
add a third FORK_DEATHSIG flag for this purpose: FORK_DEATHSIG_SIGKILL.
To make things less confusing this also renames FORK_DEATHSIG to
FORK_DEATHSIG_SIGTERM to make clear it sends SIGTERM. We already had
FORK_DEATHSIG_SIGINT, hence this makes things nicely symmetric.
A bunch of users are switched over for FORK_DEATHSIG_SIGKILL where we
know it's safe to abort things abruptly. This should make some kernel
cases more robust, since we cannot get confused by signal masks or such.
While we are at it, also fix a bunch of bugs where we didn't take
FORK_DEATHSIG_SIGINT into account in safe_fork()
We basically parsed the RFC3339 format already, except with a space:
NOTE: ISO 8601 defines date and time separated by "T".
Applications using this syntax may choose, for the sake of
readability, to specify a full-date and full-time separated by
(say) a space character.
so now we handle both
2012-11-23 11:12:13.456
2012-11-23T11:12:13.456
as equivalent.
Parse directly-suffixed Z and +05:30 timezones as well:
2012-11-23T11:12:13.456Z
2012-11-23T11:12:13.456+02:00
as they're both defined by RFC3339.
We do /not/ allow z or t; the RFC says
NOTE: Per [ABNF] and ISO8601, the "T" and "Z" characters in this
syntax may alternatively be lower case "t" or "z" respectively.
This date/time format may be used in some environments or contexts
that distinguish between the upper- and lower-case letters 'A'-'Z'
and 'a'-'z' (e.g. XML). Specifications that use this format in
such environments MAY further limit the date/time syntax so that
the letters 'T' and 'Z' used in the date/time syntax must always
be upper case. Applications that generate this format SHOULD use
upper case letters.
We /are/ in a case-sensitive environment, neither are in wide-spread
use, and "z" poses an issue of whether "todayz" should be the same
as "todayZ" ("today UTC") or an error (it should be an error).
Fractional seconds are limited to six digits (they're nominally
time-secfrac = "." 1*DIGIT
), since we only support 1µs-resolution timestamps, and limit to six
digits in our other sub-second formats.
Parsing
2012-11-23T11:12
is an extension two ways (no seconds, no timezone),
mirroring our "canonical" format.
Fixes#5194
Doesn't really matter since the two unicode symbols are supposedly
equivalent, but let's better follow the unicode recommendations to
prefer greek small letter mu, as per:
https://www.unicode.org/reports/tr25
Apparently there are two µ symbols, accept both when parsing.
One is the greek small letter mu (μ) the other is the micro sign (µ).
Unicode recommendation considers both equivalent, and says use of greek
small letter mu is preferred. See:
https://www.unicode.org/reports/tr25
Hence accept both when parsing.
Inspired by: #28029
IN C23, thread_local is a reserved keyword and we shall therefore
do nothing to redefine it. glibc has it defined for older standard
version with the right conditions.
v2 by Yu Watanabe:
Move the definition to missing_threads.h like the way we define e.g.
missing syscalls or missing definitions, and include it by the users.
Co-authored-by: Yu Watanabe <watanabe.yu+github@gmail.com>
