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Some PIDs can remain in the watched list even though their processes have
exited since a long time. It can easily happen if the main process of a forking
service manages to spawn a child before the control process exits for example.
However when a pid is about to be mapped to a unit by calling unit_watch_pid(),
the caller usually knows if the pid should belong to this unit exclusively: if
we just forked() off a child, then we can be sure that its PID is otherwise
unused. In this case we take this opportunity to remove any stalled PIDs from
the watched process list.
If we learnt about a PID in any other form (for example via PID file, via
searching, MAINPID= and so on), then we can't assume anything.
It's a glibc-specific API, but supported on FreeBSD and musl too at
least, hence fairly common. This way we can reduce our calls to
realloc() as much as possible.
The loop around ttyname_r() makes it look like we use unbounded stack
allocations. We know that that paths have a maximum size, so let's simplify
the whole thing.
Replaces #12043.
It's probably unexpected if we do a recursive chown() when dynamic users
are used but not on static users.
hence, let's tweak the logic slightly, and recursively chown in both
cases, except when operating on the configuration directory.
Fixes: #11842
Let's reduce the chance of failure: if we can't apply the chmod/chown
requested, check if it's applied anyway, and if so, supress the error.
This is even race-free since we operate on an O_PATH fd anyway.
This service uses PAM anyway, hence let pam_keyring set things up for
us. Moreover, this way we ensure that the invocation ID is not set for
this service as key, and thus can't confuse the user service's
invocation ID.
Fixes: #11649
As discussed in https://gitlab.freedesktop.org/libinput/libinput/issues/198#note_100642 the DPI for the Razer Abyssus mouse is not 3500 by default, but around 1600-1700 when measured with the mouse-dpi-tool.
So I have done some measurements now and always got a value of about 21000 device units on a distance of 12.5 inch. This would result in a calculated resolution of about 1680 DPI. Since such an odd number does not occur in the hwdb file I decided to round to 1600 DPI.
The function so far always returned -ECANCELLED, which is ignored in all
cases the function is invoked, except one: in unit_test_start_limit()
where -ECANCELLED is returned when the start limit is hit, which is part
of unit_start()'s protocol of return values.
Since the emergency_action() logic should be relatively generic and is
used in many places, let's drop the return value from it, since it's
constant anyway, and in alll cases useless. Instead, let's return it in
unit_test_start_limit(), where it's part of the protocol.
No change in behaviour.
Let's add a safety precaution: if the start condition checks for a unit
are tested too often and fail each time, let's rate limit this too.
This should add extra safety in case people define .path, .timer or
.automount units that trigger a service that as a conditoin that always
fails.
Just some renaming, no change in behaviour.
Background: I'd like to add more functions unit_test_xyz() that test
various things, hence let's streamline the naming a bit.
Introduced in 6d586a1371.
Reported by Felix Riemann in https://bugzilla.redhat.com/show_bug.cgi?id=1685286.
Reproducer:
for i in `seq 1 100`; do gdbus call --session -d org.freedesktop.systemd1 -m org.freedesktop.systemd1.Manager.StartUnit -o "/$(for x in `seq 0 28000`; do echo -n $x; done)" & done
socket_bind_to_ifindex() uses the the SO_BINDTOIFINDEX sockopt of kernel
5.0, with a fallback to SO_BINDTODEVICE on older kernels.
socket_bind_to_ifname() is a trivial wrapper around SO_BINDTODEVICE, the
only benefit of using it instead of SO_BINDTODEVICE directly is that it
determines the size of the interface name properly so that it also works
for unbinding. Moreover, it's an attempt to unify our invocations of the
sockopt with a size of strlen(ifname) rather than strlen(ifname)+1...
By default the run_qemu() function enables KVM automatically
if it detects the /dev/kvm char device and if the machine is not
already a KVM one. Let's add a TEST_NO_KVM env variable to suppress
this detection.
Make the interactive debugging of (particularly QEMU) machines less
painful, by replacing the default vt220 TERM with linux one, and
by not shutting down the machine after running the test itself.
