This addresses the comment by Lennart
https://github.com/systemd/systemd/pull/22662#discussion_r829799863:
> /sys/subsystem is preparation for a future that never came.
> And given that the main proponent of this left Linux kernel
> development (Kay), I doubt this will ever come. So maybe we
> should start dropping references to /sys/subsystem/ given it's
> unlikely to materialize anytime soon.
and devices are sorted when the iteration started.
Previously, devices added by udev_enumerate_add_syspath() ->
device_enumerator_add_device() are not sorted. This fixes the issue.
We shouldn't auto-disable event sources we create in "floating" mode.
Hence don#t use the disabling destructor for event sources.
Given that noone else has access to this event source we just allocated
anyway there's no point in explicitly disabling it before freeing it.
Follow-up for ec75e8e07a
We so far had some magic logic in place that files we open for write
with size zero are freshly created. That of course is a bogus
assumption, in particular as this code deals with corrupted file systems
which oftentimes contain zero size inodes from left-over runs.
Let's fix this properly, and actually let the kernel tell us whether it
create the file or not.
This is a wrapper around openat(). It works mostly the same, except for
one thing: it race-freely reports whether we just created the indicated
file in case O_CREAT is passed without O_EXCL.
"""
Given an array a[N] of N elements of type T:
- Forming a pointer &a[i] (or a + i) with 0 ≤ i ≤ N is safe.
- Forming a pointer &a[i] with i < 0 or i > N causes undefined behavior.
- Dereferencing a pointer &a[i] with 0 ≤ i < N is safe.
- Dereferencing a pointer &a[i] with i < 0 or i ≥ N causes undefined behavior.
"""
As pointed by by @medhefgo, here we were forming a pointer to a[-1]. a itself
wasn't NULL, so a > 0, and a-1 was also >= 0, and this didn't seem to cause any
problems. But it's better to be formally correct, especially if we move the
code to src/fundamental/ later on and compile it differently.
Compilation shows no size change (with -O0 -g) on build/systemd, so this should
have no effect whatsoever.
With my crappy home network the test takes 29.5s usually. But with any
tiny slowdown, it goes above the 30s limit and fails. Let's bump the
timeout to avoid spurious failures.
