In principle, arbitrary notifications may be sent via sd_notify. But in
practice, this is not useful at all, since the manager only accepts
notifications from services and ignores anything except a few specific
ones. The others will be logged if debugging is enabled. OTOH, the manager
produces EXIT_STATUS, but nothing in systemd looks at it, which is rather
confusing.
So remove the recommendation to use X_ prefixes, and instead say that other
messages will be ignored. Also, mention that mkosi uses this. Having an example
may be useful to understand what is going on.
Strangely, this is the first reference to mkosi in our man pages. Even more
strangely, debian is the only place which hosts the mkosi man page (among
the sites we have definitions for), so I linked to that version.
This tries to add information about when each option was added. It goes
back to version 183.
The version info is included from a separate file to allow generating it,
which would allow more control on the formatting of the final output.
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
I guess it was only a question of time until we need to add the final
frontier of notification functions: one that combines the features of
all the others:
1. specifiying a source PID
2. taking a list of fds to send along
3. accepting a format string for the status string
Hence, let's add it.
See #26688: getenv() is not thread-safe, and could a possible source of
problems when a multi-threaded program calls setenv()/putenv()/unsetenv() in
parallel. It is not possible to avoid getenv() calls in general, since $PATH,
$LANG, $SHELL, $USER, $HOME, $TZ may need to be accessed at any time.
Add a warning to our docs so that people are aware of the issue.
Closes#26688. (Real fixes will need to be in glibc and gnome-shell or other
programs.)
The text is added to threads-aware.xml to be included in various places. By
including it in libsystemd-pkgconfig.xml, it is automatically added to all sd-*
pages. The text is also included explicitly in pages for a few other functions
which are call getenv().
Whether we use a newline at the beginning of <programlisting> or not doesn't
seem to have any effect. So let's use the newline in multi-line examples; it is
easier to get the indentation right this way.
Allow sending notifications via AF_VSOCK, so that VMs can communicate
to the hypervisor/VMM that they are finished booting.
Note that if the hypervisor does not support SOCK_DGRAM over AF_VSOCK
(ie: qemu at the time of writing), SOCK_SEQPACKET will be used instead.
Let's nudge people towards the use of an anonymous buffer like we
do internally.
"errno" → "errnum", to match the man page for strerror, and also to avoid
confusion with the global variable. In general, I think that errno is a
terrible interface and we shouldn't encourage people to use it. Those functions
use errno-style error numbers, which are a different thing.
