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2015-06-17Merge pull request #221 from utezduyar/man-cgtop-explain-max-cpuLennart Poettering
man: explain max CPU load on cgtop
2015-06-17tmpfiles: only root-owned aquota.* files are specialZbigniew Jędrzejewski-Szmek
Fixes #188.
2015-06-17Merge pull request #253 from dvdhrm/libudev-manKay Sievers
man: add libudev man-pages (skeletons)
2015-06-17update TODOLennart Poettering
2015-06-17man: add libudev man-pages (skeletons)David Herrmann
This adds man-pages for most of the libudev symbols we export. Similar symbols are grouped together in a single man-page, with respective links added. All man-pages contain the full skeleton including NAME, SYNOPSIS, RETURN VALUE and SEE ALSO. However, most of them still lack the DESCRIPTION part. This should be copied from the gtkdoc descriptions in src/libudev/libudev*.[ch]. Any help is welcome! (the whole skeleton is already done, so it's really just about the prose-part of the man-pages to be written). Missing from the man-pages are the following parts: - udev_set_log_fn() - udev_[gs]et_log_priority() - udev_[gs]et_userdata() - udev_list_entry_foreach() - udev_device_get_seqnum() - udev_device_get_usec_since_initialized() - udev_util_encode_string() These are considered legacy, afaik. If not, please feel free to add them now! Furthermore, udev-hwdb and udev-queue are not documented at all (for the same reasons).
2015-06-17Merge pull request #176 from filbranden/test_cgroup_mask1Lennart Poettering
test-cgroup-mask: unit_get_sibling_mask ignores cgroup_supported
2015-06-17Merge pull request #251 from zonque/signalKay Sievers
core: execute: fix regression in pam_setup()
2015-06-17core: execute: fix regression in pam_setup()Daniel Mack
Commit 72c0a2c25 ("everywhere: port everything to sigprocmask_many() and friends") reworked code tree-wide to use the new sigprocmask_many() helper. In this, it caused a regression in pam_setup, because it dropped a line to initialize the 'ss' signal mask which is later used in sigwait(). While at it, move the variable declaration to an inner scope.
2015-06-17man: explain max CPU load on cgtopUmut Tezduyar Lindskog
2015-06-17Merge pull request #246 from smcv/xpg-not-xdgLennart Poettering
Stop talking about the "XDG" version of basename()
2015-06-17Merge pull request #245 from poettering/always-sdbus-man-pagesDaniel Mack
man: always build sd-bus man pages, even if kdbus is disabled
2015-06-17man: always build sd-bus man pages, even if kdbus is disabledLennart Poettering
After all, we now moved sd-bus out of the kdbus conditional, hence the man pages should be too.
2015-06-17Stop talking about the "XDG" version of basename()Simon McVittie
XDG refers to X Desktop Group, a former name for freedesktop.org. This group is responsible for specifications like basedirs, .desktop files and icon naming, but as far as I know, it has never tried to redefine basename(). I think these references were meant to say XPG (X/Open Portability Guide), a precursor of POSIX. POSIX is better-known and less easily confused with XDG, and is how the basename(3) man page describes the libgen.h version of basename(). The other version of basename() is glibc-specific and is described in basename(3) as "the GNU version"; specifically mention that version, to disambiguate.
2015-06-17Merge pull request #244 from poettering/sdbus-suppress-localDavid Herrmann
sd-bus: suppress installing local bus matches server side
2015-06-17sd-bus: suppress installing local bus matches server sideLennart Poettering
Matches that can only match against messages from the org.freedesktop.DBus.Local service (or the local interfaces or path) should never be installed server side, suppress them hence. Similar, on kdbus matches that can only match driver messages shouldn't be passed to the kernel.
2015-06-17Merge pull request #241 from jsynacek/doc-fixDaniel Mack
doc: improve readability in journald.conf.5
2015-06-17Merge pull request #239 from dvdhrm/event-assertLennart Poettering
sd-event: make errors on EPOLL_CTL_DEL pseudo-fatal
2015-06-17doc: improve readability in journald.conf.5Jan Synacek
2015-06-17sd-event: make errors on EPOLL_CTL_DEL pseudo-fatalDavid Herrmann
If we call EPOLL_CTL_DEL, we *REALLY* expect the file-descriptor to be present in that given epoll-set. We actually track such state via our s->io.registered flag, so it better be true. Make sure if that's not true, we treat it similar to assert_return() (ie., print a loud warning).
2015-06-17Merge pull request #240 from kaysievers/wipKay Sievers
build-sys: hide magic section variables from exported symbols
2015-06-17Merge pull request #238 from dvdhrm/udev-epollKay Sievers
udev: don't close FDs before dropping them from epoll
2015-06-17build-sys: hide magic section variables from exported symbolsKay Sievers
https://github.com/systemd/systemd/issues/234
2015-06-17udev: don't close FDs before dropping them from epollDavid Herrmann
Make sure we never close fds before we drop their related event-source. This will cause horrible disruptions if the fd-num is re-used by someone else. Under normal conditions, this should not cause any problems as the close() will drop the fd from the epoll-set automatically. However, this changes if you have any child processes with a copy of that fd. This fixes issue #163. Background: If you create an epoll-set via epoll_create() (lets call it 'EFD') you can add file-descriptors to it to watch for events. Whenever you call EPOLL_CTL_ADD on a file-descriptor you want to watch, the kernel looks up the attached "struct file" pointer, that this FD refers to. This combination of the FD-number and the "struct file" pointer is used as key to link it into the epoll-set (EFD). This means, if you duplicate your file-descriptor, you can watch this file-descriptor, too (because the duplicate will have a different FD-number, hence, the combination of FD-number and "struct file" is different as before). If you want to stop watching an FD, you use EPOLL_CTL_DEL and pass the FD to the kernel. The kernel again looks up your file-descriptor in your FD-table to find the linked "struct file". This FD-number and "struct file" combination is then dropped from the epoll-set (EFD). Last, but not least: If you close a file-descriptor that is linked to an epoll-set, the kernel does *NOTHING* regarding the epoll-set. This is a vital observation! Because this means, your epoll_wait() calls will still return the metadata you used to watch/subscribe your file-descriptor to events. There is one exception to this rule: If the file-descriptor that you just close()ed was the last FD that referred to the underlying "struct file", then _all_ epoll-set watches/subscriptions are destroyed. Hence, if you never dup()ed your FD, then a simple close() will also unsubscribe it from any epoll-set. With this in mind, lets look at fork(): Assume you have an epoll-set (EFD) and a bunch of FDs subscribed to events on that EFD. If you now call fork(), the new process gets a copy of your file-descriptor table. This means, the whole table is copied and the "struct file" reference of each FD is increased by 1. It is important to notice that the FD-numbers in the child are exactly the same as in the parent (eg., FD #5 in the child refers to the same "struct file" as FD #5 in the parent). This means, if the child calls EPOLL_CTL_DEL on an FD, the kernel will look up the linked "struct file" and drop the FD-number and "struct file" combination from the epoll-set (EFD). However, this will effectively drop the subscription that was installed by the parent. To sum up: even though the child gets a duplicate of the EFD and all FDs, the subscriptions in the EFD are *NOT* duplicated! Now, with this in mind, lets look at what udevd does: Udevd has a bunch of file-descriptors that it watches in its sd-event main-loop. Whenever a uevent is received, the event is dispatched on its workers. If no suitable worker is present, a new worker is fork()ed to handle the event. Inside of this worker, we try to free all resources we inherited. However, the fork() call is done from a call-stack that is never rewinded. Therefore, this call stack might own references that it drops once it is left. Those references we cannot deduce from the fork()'ed process; effectively causing us to leak objects in the worker (eg., the call to sd_event_dispatch() that dispatched our uevent owns a reference to the sd_event object it used; and drops it again once the function is left). (Another example is udev_monitor_ref() for each 'worker' that is also inherited by all children; thus keeping the udev-monitor and the uevent-fd alive in all children (which is the real cause for bug #163)) (The extreme variant is sd_event_source_unref(), which explicitly keeps event-sources alive, if they're currently dispatched, knowing that the dispatcher will free the event once done. But if the dispatcher is in the parent, the child will never ever free that object, thus leaking it) This is usually not an issue. However, if such an object has a file-descriptor embedded, this FD is left open and never closed in the child. In manager_exit(), if we now destroy an object (i.e., close its embedded file-descriptor) before we destroy its related sd_event_source, then sd-event will not be able to drop the FD from the epoll-set (EFD). This is, because the FD is no longer valid at the time we call EPOLL_CTL_DEL. Hence, the kernel cannot figure out the linked "struct file" and thus cannot remove the FD-number plus "struct file" combination; effectively leaving the subscription in the epoll-set. Since we leak the uevent-fd in the children, they retain a copy of the FD pointing to the same "struct file". Thus, the EFD-subscription are not automatically removed by close() (as described above). Therefore, the main daemon will still get its metadata back on epoll_watch() whenever an event occurs (even though it already freed the metadata). This then causes the free-after-use bug described in #163. This patch fixes the order in which we destruct objects and related sd-event-sources. Some open questions remain: * Why does source_io_unregister() not warn on EPOLL_CTL_DEL failures? This really needs to be turned into an assert_return(). * udevd really should not leak file-descriptors into its children. Fixing this would *not* have prevented this bug, though (since the child-setup is still async). It's non-trivial to fix this, though. The stack-context of the caller cannot be rewinded, so we cannot figure out temporary refs. Maybe it's time to exec() the udev-workers? * Why does the kernel not copy FD-subscriptions across fork()? Or at least drop subscriptions if you close() your FD (it uses the FD-number as key, so it better subscribe to it)? Or it better used FD+"struct file_table*"+"struct file*" as key to not allow the childen to share the subscription table.. *sigh* Seems like we have to live with that API forever.
2015-06-16Merge pull request #231 from tixxdz/nspawn-userns-fixes-2Lennart Poettering
nspawn: check if kernel supports userns as early as possible
2015-06-16nspawn: check if kernel supports userns as early as possibleDjalal Harouni
If the kernel do not support user namespace then one of the children created by nspawn parent will fail at clone(CLONE_NEWUSER) with the generic error EINVAL and without logging the error. At the same time the parent may also try to setup the user namespace and will fail with another error. To improve this, check if the kernel supports user namespace as early as possible.
2015-06-16Merge pull request #228 from teg/tmpfiles-btrfs-notdirLennart Poettering
tmpfiles: silently ignore failed removal of btrfs submount from non-dir
2015-06-16tmpfiles: silently ignore failed removal of btrfs submount from non-dirTom Gundersen
This fixes: Jun 16 16:00:20 tomegun-x2402 systemd-tmpfiles[233]: rm_rf(/var/lib/machines/.#fedora.lck): Not a directory Jun 16 16:00:20 tomegun-x2402 systemd-tmpfiles[233]: rm_rf(/var/lib/machines/.#Fedora-Cloud-Base-20141203-21.x86_64.raw.lck): Not a directory
2015-06-16Merge pull request #197 from dvdhrm/hashmapMichal Schmidt
hashmap: fix iterators to not skip entries
2015-06-16Merge pull request #223 from ronnychevalier/rc/warning_va_startDavid Herrmann
signal-util: fix incorrect argument of va_start
2015-06-16Merge pull request #222 from utezduyar/mem-leak-on-bus-errorDaniel Mack
sd-bus: use proper cleanup macro
2015-06-16signal-util: fix incorrect argument of va_startRonny Chevalier
The last argument of the function before the vargs is "old" not "how". warning: second parameter of ‘va_start’ not last named argument
2015-06-16sd-bus: use proper cleanup macroUmut Tezduyar Lindskog
2015-06-16Merge pull request #218 from poettering/dual-timestamp-nullDaniel Mack
everywhere: actually make use of DUAL_TIMESTAMP_NULL macro
2015-06-16Merge pull request #219 from poettering/logind-dockedDaniel Mack
logind: expose "Docked" bool as property on the bus
2015-06-16logind: cast close() call to (void)Lennart Poettering
2015-06-16logind: expose "Docked" bool as property on the busLennart Poettering
We know the state anyway, let's expose it in the bus. It's useful for debugging at least, but it might be useful for DEs too.
2015-06-16everywhere: actually make use of DUAL_TIMESTAMP_NULL macroLennart Poettering
Let's use it as initializer where appropriate.
2015-06-16update TODOLennart Poettering
2015-06-15Merge pull request #214 from poettering/signal-rework-2Lennart Poettering
everywhere: port everything to sigprocmask_many() and friends
2015-06-15Merge pull request #212 from poettering/gc-machine-snapshotsLennart Poettering
automatically remove old machine shapshots at boot
2015-06-15everywhere: port everything to sigprocmask_many() and friendsLennart Poettering
This ports a lot of manual code over to sigprocmask_many() and friends. Also, we now consistly check for sigprocmask() failures with assert_se(), since the call cannot realistically fail unless there's a programming error. Also encloses a few sd_event_add_signal() calls with (void) when we ignore the return values for it knowingly.
2015-06-15Merge pull request #209 from crrodriguez/masterKay Sievers
buildsys: missing SECCOMP_CFLAGS in various places
2015-06-15tmpfiles: automatically remove old machine snapshots at bootLennart Poettering
Remove old temporary snapshots, but only at boot. Ideally we'd have "self-destroying" btrfs snapshots that go away if the last last reference to it does. To mimic a scheme like this at least remove the old snapshots on fresh boots, where we know they cannot be referenced anymore. Note that we actually remove all temporary files in /var/lib/machines/ at boot, which should be safe since the directory has defined semantics. In the root directory (where systemd-nspawn --ephemeral places snapshots) we are more strict, to avoid removing unrelated temporary files. This also splits out nspawn/container related tmpfiles bits into a new tmpfiles snippet to systemd-nspawn.conf
2015-06-15tmpfiles: make sure "R" lines also remove subvolumesLennart Poettering
2015-06-15util: when creating temporary file names, allow including extra id string in itLennart Poettering
This adds a "char *extra" parameter to tempfn_xxxxxx(), tempfn_random(), tempfn_ranomd_child(). If non-NULL this string is included in the middle of the newly created file name. This is useful for being able to distuingish the kind of temporary file when we see one. This also adds tests for the three call. For now, we don't make use of this at all, but port all users over.
2015-06-15buildsys: missing SECCOMP_CFLAGS in various placesCristian Rodríguez
libcore, systemd and nspawn fail to build when seccomp headers are not in the include path.
2015-06-15Merge pull request #208 from poettering/btrfs-rec-snapshotLennart Poettering
btrfs-util: when snapshotting make sure we don't descent into subvolu…
2015-06-15btrfs-util: when snapshotting make sure we don't descent into subvolumes we ↵Lennart Poettering
just created We already had a safety check in place that we don't end up descending to the original subvolume again, but we also should avoid descending in the newly created one. This is particularly important if we make a snapshot below its source, like we do in "systemd-nspawn --ephemeral -D /". Closes https://bugs.freedesktop.org/show_bug.cgi?id=90803
2015-06-15Merge pull request #154 from dmedri/masterDaniel Mack
Italian .po updates
2015-06-15Merge pull request #202 from victorenator/l10n-beDaniel Mack
l10n: Add Belarusian translation