| Commit message (Collapse) | Author | Age |
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This adds what has been added to sd_bus_slot and sd_bus_track to
sd_event too.
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This tests a couple of corner cases of the sd-event API including
changing priorities of existing event sources, as well as overflow
conditions of the inotify queue.
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This adds a new call sd_event_add_inotify() which allows watching for
inotify events on specified paths.
sd-event will try to minimize the number of inotify fds allocated, and
will try to add file watches to the same inotify fd objects as far as
that's possible. Doing this kind of inotify object should optimize
behaviour in programs that watch a limited set of mostly independent
files as in most cases a single inotify object will suffice for watching
all files.
Traditionally, this kind of coalescing logic (i.e. that multiple event
sources are implemented on top of a single inotify object) was very hard
to do, as the inotify API had serious limitations: it only allowed
adding watches by path, and would implicitly merge watches installed on
the same node via different path, without letting the caller know about
whether such merging took place or not.
With the advent of O_PATH this issue can be dealt with to some point:
instead of adding a path to watch to an inotify object with
inotify_add_watch() right away, we can open the path with O_PATH first,
call fstat() on the fd, and check the .st_dev/.st_ino fields of that
against a list of watches we already have in place. If we find one we
know that the inotify_add_watch() will update the watch mask of the
existing watch, otherwise it will create a new watch. To make this
race-free we use inotify_add_watch() on the /proc/self/fd/ path of the
O_PATH fd, instead of the original path, so that we do the checking and
watch updating with guaranteed the same inode.
This approach let's us deal safely with inodes that may appear under
various different paths (due to symlinks, hardlinks, bind mounts, fs
namespaces). However it's not a perfect solution: currently the kernel
has no API for changing the watch mask of an existing watch -- unless
you have a path or fd to the original inode. This means we can "merge"
the watches of the same inode of multiple event sources correctly, but
we cannot "unmerge" it again correctly in many cases, as access to the
original inode might have been lost, due to renames, mount/unmount, or
deletions. We could in theory always keep open an O_PATH fd of the inode
to watch so that we can change the mask anytime we want, but this is
highly problematics, as it would consume too many fds (and in fact the
scarcity of fds is the reason why watch descriptors are a separate
concepts from fds) and would keep the backing mounts busy (wds do not
keep mounts busy, fds do). The current implemented approach to all this:
filter in userspace and accept that the watch mask on some inode might
be higher than necessary due to earlier installed event sources that
might have ceased to exist. This approach while ugly shouldn't be too
bad for most cases as the same inodes are probably wacthed for the same
masks in most implementations.
In order to implement priorities correctly a seperate inotify object is
allocated for each priority that is used. This way we get separate
per-priority event queues, of which we never dequeue more than a few
events at a time.
Fixes: #3982
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Files which are installed as-is (any .service and other unit files, .conf
files, .policy files, etc), are left as is. My assumption is that SPDX
identifiers are not yet that well known, so it's better to retain the
extended header to avoid any doubt.
I also kept any copyright lines. We can probably remove them, but it'd nice to
obtain explicit acks from all involved authors before doing that.
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This adds some paranoia code that moves some of the fds we allocate for
longer periods of times to fds > 2 if they are allocated below this
boundary. This is a paranoid safety thing, in order to avoid that
external code might end up erroneously use our fds under the assumption
they were valid stdin/stdout/stderr. Think: some app closes
stdin/stdout/stderr and then invokes 'fprintf(stderr, …' which causes
writes on our fds.
This both adds the helper to do the moving as well as ports over a
number of users to this new logic. Since we don't want to litter all our
code with invocations of this I tried to strictly focus on fds we keep
open for long periods of times only and only in code that is frequently
loaded into foreign programs (under the assumptions that in our own
codebase we are smart enough to always keep stdin/stdout/stderr
allocated to avoid this pitfall). Specifically this means all code used
by NSS and our sd-xyz API:
1. our logging APIs
2. sd-event
3. sd-bus
4. sd-resolve
5. sd-netlink
This changed was inspired by this:
https://github.com/systemd/systemd/issues/8075#issuecomment-363689755
This shows that apparently IRL there are programs that do close
stdin/stdout/stderr, and we should accomodate for that.
Note that this won't fix any bugs, this just makes sure that buggy
programs are less likely to interfere with out own code.
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It is often the case that a file descriptor and its corresponding IO
sd_event_source share a life span. When this is the case, developers will
have to unref the event source and close the file descriptor. Instead, we
can just have the event source take ownership of the file descriptor and
close it when the event source is freed. This is especially useful when
combined with cleanup attributes and sd_event_source_unrefp().
This patch adds two new public functions:
sd_event_source_get_io_fd_own()
sd_event_source_set_io_fd_own()
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Currently, sd-event supports the ability to have a thread-local default
event loop. However, this is less useful than it can be since all functions
which require an sd_event* as input require the caller to pass it. This
patch adds a new macro which allows the developer to pass a constant
SD_EVENT_DEFAULT instead. This reduces work for the caller.
For example:
r = sd_event_default(&e);
r = sd_event_add_io(e, ...);
sd_event_unref(e);
Becomes:
r = sd_event_add_io(SD_EVENT_DEFAULT, ...);
If no thread-local default event loop exists, the function calls will
return -ENOPKG. No event loop will ever be implicitly created.
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Follow-up for 85e55d14dea66f5fe412ca8128487d5ea828b7b1.
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The process of cleaning up elogind, meaning to mask all bits that are
unneeded by elogind, has been finished a while ago.
It is therefore time to re-enable all previously masked API functions
that elogind can support. This will make it easier for future
developers to integrate elogind into their software where they
already support systemd-login.
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Fixup for f4b51a2d09. Suggested by Evgeny Vereshchagin.
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This object takes a number of bpf_insn members and wraps them together with
the in-kernel reference id. Will be needed by the firewall code.
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Upstream thinks, that the auto tools are too 'legacy', or that they
are at least no longer fitting.
We follow, as the classic auto tools files have been removed, so no
other choice here...
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Needed on musl.
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These functions, although not used by elogind itself, are mostly tiny
and crucial for important tests to work.
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(#5271)
The code make the following assertion: when freeing a event loop object
(usually it's done after exiting from the main event loop), no signal events
are still queued and are pending.
This assertion can be found in event_unmask_signal_data() with
"assert(!d->current);" assertion.
It appears that this assertion can be wrong at least in a specific case
described below.
Consider the following example which is inspired from udev: a process defines 3
source events: 2 are created by sd_event_add_signal() and 1 is created by
sd_event_add_post().
1. the process receives the 2 signals consecutively so that signal 'A' source
event is queued and pending. Consequently the post source event is also
queued and pending. This is done by sd_event_wait().
2. The callback for signal 'A' is called by sd_event_dispatch().
3. The next call to sd_event_wait() will queue signal 'B' source event.
4. The callback for the post source event is called and calls sd_event_exit().
5. the event loop is exited.
6. freeing the event loop object will lead to the assertion failure in
event_unmask_signal_data().
This patch simply removes this assertion as it doesn't seem to be a
bug if the signal data still reference a signal source at this point.
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If a callback of an event source returns an error, then the event source
might already be half-destroyed, if the callback dropped all refs.
Hence, don't assume that the type is still valid, and save it before we
issue the callback.
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To properly store priority in passed in pointer and return 0 for success.
Also add a test for verifying that it works correctly.
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(#5271)
The code make the following assertion: when freeing a event loop object
(usually it's done after exiting from the main event loop), no signal events
are still queued and are pending.
This assertion can be found in event_unmask_signal_data() with
"assert(!d->current);" assertion.
It appears that this assertion can be wrong at least in a specific case
described below.
Consider the following example which is inspired from udev: a process defines 3
source events: 2 are created by sd_event_add_signal() and 1 is created by
sd_event_add_post().
1. the process receives the 2 signals consecutively so that signal 'A' source
event is queued and pending. Consequently the post source event is also
queued and pending. This is done by sd_event_wait().
2. The callback for signal 'A' is called by sd_event_dispatch().
3. The next call to sd_event_wait() will queue signal 'B' source event.
4. The callback for the post source event is called and calls sd_event_exit().
5. the event loop is exited.
6. freeing the event loop object will lead to the assertion failure in
event_unmask_signal_data().
This patch simply removes this assertion as it doesn't seem to be a
bug if the signal data still reference a signal source at this point.
(cherry picked from commit 4470860388e12a5dda1d65773e411a349221a3e9)
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Before we invoke now(CLOCK_BOOTTIME), let's make sure we actually have that
clock, since now() will otherwise hit an assert.
Specifically, let's refuse CLOCK_BOOTTIME early in sd-event if the kernel
doesn't actually support it.
This is a follow-up for #3037, and specifically:
https://github.com/elogind/elogind/pull/3037#issuecomment-210199167
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(#3037)
It was added in 2.6.39, and causes an assertion to fail when running in mock
hosted on 2.6.32-based RHEL-6:
Assertion 'clock_gettime(map_clock_id(clock_id), &ts) == 0' failed at elogind/src/basic/time-util.c:70, function now(). Aborting.
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numbers
And port all code over to use it.
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Fixes: #2597
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event source
This should simplify handling of time events in clients and is in-line with the USEC_INFINITY macro we already have.
This way setting a timeout to 0 indicates "elapse immediately", and a timeout of USEC_INFINITY "elapse never".
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deal with overflows
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sd_event_now() is a public function, so we must check all
arguments for validity. Update man page and add tests.
Sample debug message:
Assertion 'IN_SET(clock, CLOCK_REALTIME, CLOCK_REALTIME_ALARM, CLOCK_MONOTONIC, CLOCK_BOOTTIME, CLOCK_BOOTTIME_ALARM)' failed at src/libelogind/sd-event/sd-event.c:2719, function sd_event_now(). Ignoring.
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Printing the pointer variable really doesn't help, so drop that.
Instead, add a string lookup table for the EventSourceType enum, and print
the type of event source in case of errors.
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Set SD_EVENT_PROFILE_DELAYS to activate accounting and periodic logging
of the distribution of delays between sd_event_run() calls.
Time spent in dispatching as well as time spent outside of
sd_event_run() is measured and accounted for. Every 5 seconds a
logarithmic histogram loop iteration delays since 5 seconds previous is
logged.
This is useful in identifying the frequency and magnitude of latencies
affecting the event loop, which should be kept to a minimum.
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We already have a state RUNNING and EXITING when we dispatch regular and
exit callbacks. Let's introduce a new state called PREPARING that is
active while we invoke preparation callbacks. This way we have a state
each for all three kinds of event handlers.
The states are currently not documented, hence let's add a new state to
the end, before we start documenting this.
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Apply remaining fixes and the performed move of utility functions
into their own foo-util.[hc] files on the rest of elogind.
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