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signal(7) provides a list of functions which may be called from a
signal handler. Other functions, which only call those functions and
don't access global memory and are reentrant are also safe.
sd_j_sendv was mostly OK, but would call mkostemp and writev in a
fallback path, which are unsafe.
Being able to call sd_j_sendv in a async-signal-safe way is important
because it allows it be used in signal handlers.
Safety is achieved by replacing mkostemp with open(O_TMPFILE) and an
open-coded writev replacement which uses write. Unfortunately,
O_TMPFILE is only available on kernels >= 3.11. When O_TMPFILE is
unavailable, an open-coded mkostemp is used.
https://bugzilla.gnome.org/show_bug.cgi?id=722889
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Similar to PrivateNetwork=, PrivateTmp= introduce PrivateDevices= that
sets up a private /dev with only the API pseudo-devices like /dev/null,
/dev/zero, /dev/random, but not any physical devices in them.
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Before, X11 keymap fr-pc105-oss would be converted to fr,
even though fr-oss exists. Now, if
/usr/lib/kbd/keymaps/xkb/<layout>[-<variant>].map[.gz] exists,
<layout>[-<variant>] will be used as the console keymap,
falling back to the legacy mappings otherwise.
% sudo localectl set-x11-keymap pl pc105
% localectl
System Locale: LANG=en_US.UTF-8
VC Keymap: pl (was pl2 before)
X11 Layout: pl
X11 Model: pc105
% sudo localectl set-x11-keymap fr pc105 oss
% localectl
System Locale: LANG=en_US.UTF-8
VC Keymap: fr-oss (was fr before)
X11 Layout: fr
X11 Model: pc105
X11 Variant: oss
% sudo localectl set-x11-keymap fr pc105
% localectl
System Locale: LANG=en_US.UTF-8
VC Keymap: fr
X11 Layout: fr
X11 Model: pc105
% sudo localectl set-x11-keymap gb
% localectl
System Locale: LANG=en_US.UTF-8
VC Keymap: gb (was uk before)
X11 Layout: gb
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https://bugzilla.redhat.com/show_bug.cgi?id=821723
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reboot syscall can be performed with an additional argument. In some
systems this functionality can be useful to modify the mode of the
next boot performed by the bootloader.
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Only ASCII letters and digits are allowed.
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This is a minor fix because it's not a major issue, this fix just avoid
to get EINVAL error from sigaction(2).
There are two signals can not handled at user space, SIGKILL and
SIGSTOP even we're PID 1, trying to handle these two signals will get
EINVAL error.
There are two kinds of systemd instance, running as system manager or
user session manager, apparently, the latter is a general user space
process which can not handle SIGKILL. The special pid 1 also can not
do that refer to kernel/signal.c:do_sigaction().
However, pid 1 is unkillable because the kernel did attach
SIGNAL_UNKILLABLE to it at system boot up, refer to
init/main.c:start_kernel()
--> rest_init()
--> kernel_thread()
--> kernel_init()
--> init_post()
current->signal->flags |= SIGNAL_UNKILLABLE
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#pragma once has been "un-deprecated" in gcc since 3.3, and is widely supported
in other compilers.
I've been using and maintaining (rebasing) this patch for a while now, as
it annoyed me to see #ifndef fooblahfoo, etc all over the place,
almost arrogant about the annoyance of having to define all these names to
perform a commen but neccicary functionality, when a completely superior
alternative exists.
I havn't sent it till now, cause its kindof a style change, and it is bad
voodoo to mess with style that has been established by more established
editors. So feel free to lambast me as a crazy bafoon.
v2 - preserve externally used headers
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This adds a timeout if the TTY cannot be acquired and makes sure we
always output the question to the console, never to the TTY of the
respective service.
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