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strjoina() is unsafe to be used in an unbounded loop as alloca() has no error
reporting. Thus devices with a large number of tags or devlinks trigger a
segfault in device_properties_prepare() due to overflowing the stack.
Rewrite the building of the "tags" and "devlinks" strings using
GREEDY_REALLOC() and strpcpy() to work with arbitrarily long strings. This also
avoids re-copying the entire string in each loop iteration.
Before this commit we always appended one final ":" to "tags". Change this to
start with an iniital ":" and for each tag append instead of prepend a ":".
This unifies what happens for the first and all subsequent tags so that we can
use a for loop.
Fixes #2954
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Throughout the tree there's spurious use of spaces separating ++ and --
operators from their respective operands. Make ++ and -- operator
consistent with the majority of existing uses; discard the spaces.
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lldp fixes, second iteration
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set_iterate sets the output argument to NULL on error, and the return
value is not used in this case.
CID #1306804-09.
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Usually, we place the #pragma once before the copyright blurb in header files,
but in a few cases we didn't. Move those around, so that we do the same thing
everywhere.
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This should be handled fine now by .dir-locals.el, so need to carry that
stuff in every file.
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The code is correct, assuming that the kernel does not feed
us garbled data. Let's initialize those variables to avoid the
warning anyway.
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GLIB has recently started to officially support the gcc cleanup
attribute in its public API, hence let's do the same for our APIs.
With this patch we'll define an xyz_unrefp() call for each public
xyz_unref() call, to make it easy to use inside a
__attribute__((cleanup())) expression. Then, all code is ported over to
make use of this.
The new calls are also documented in the man pages, with examples how to
use them (well, I only added docs where the _unref() call itself already
had docs, and the examples, only cover sd_bus_unrefp() and
sd_event_unrefp()).
This also renames sd_lldp_free() to sd_lldp_unref(), since that's how we
tend to call our destructors these days.
Note that this defines no public macro that wraps gcc's attribute and
makes it easier to use. While I think it's our duty in the library to
make our stuff easy to use, I figure it's not our duty to make gcc's own
features easy to use on its own. Most likely, client code which wants to
make use of this should define its own:
#define _cleanup_(function) __attribute__((cleanup(function)))
Or similar, to make the gcc feature easier to use.
Making this logic public has the benefit that we can remove three header
files whose only purpose was to define these functions internally.
See #2008.
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We have enough places where we parse an ifindex, hence introduce a
proper parsing function for it, that verifies all parameters.
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Also, move a couple of more path-related functions to path-util.c.
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There are more than enough to deserve their own .c file, hence move them
over.
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string-util.[ch]
There are more than enough calls doing string manipulations to deserve
its own files, hence do something about it.
This patch also sorts the #include blocks of all files that needed to be
updated, according to the sorting suggestions from CODING_STYLE. Since
pretty much every file needs our string manipulation functions this
effectively means that most files have sorted #include blocks now.
Also touches a few unrelated include files.
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The kernel replaces '/' in device names with '!', we translate that back
to '/' in sysname, when taking sysname as input, we should translate it
back again.
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Use %m where previously %s was used together with strerrno().
Fixes: e53fc357a9b "tree-wide: remove a number of invocations of
strerror() and replace by %m"
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A few of the recent conversions to log_*_errno() were missing the errno
value arguments.
Fixes: e53fc357a9b "tree-wide: remove a number of invocations of
strerror() and replace by %m"
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Let's clean up our tree a bit, and reduce invocations of the
thread-unsafe strerror() by replacing it with printf()'s %m specifier.
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Prior to commit c32eb440bab953a0169cd207dfef5cad16dfb340, libudev's
function udev_enumerate_scan_devices() had behaved differently. If
parent match was added with udev_enumerate_add_match_parent(),
udev_enumerate_scan_devices() did not return error if some child devices
had no subsystem symlink in sysfs. An example of such devices is USB
endpoints /sys/bus/usb/devices/*/ep_*. If there was a parent match
against USB device, old implementation of udev_enumerate_scan_devices()
did not treat ep_* device directories without subsystem symlink as error
and just ignored them, but new implementation returns -ENOENT (also
ignoring these devices) though correctly enumerates all other matching
devices.
To compare, you could look at 96df036fe3d25525a44f5efdb2fc8560e82e6cfd,
in src/libudev/libudev-enumerate.c, function parent_add_child():
if (!match_subsystem(enumerate, udev_device_get_subsystem(dev)))
goto nomatch;
udev_device_get_subsystem() was returning NULL, match_subsystem() was
returning false, and USB endpoint device was ignored.
New parent_add_child() from src/libsystemd/sd-device/device-enumerator.c
checks return value of sd_device_get_subsystem() and fails if subsystem
was not found. Absence of subsystem symlink should not be really treated
as error because all enumerations of children of USB devices will fail
with -ENOENT. This new behavior also breaks system-config-printer.
So restore old behavior and treat absence of subsystem symlink as no
match.
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Some places invoked fflush() directly with their own manual error
checking, let's unify all that by using fflush_and_check().
This also unifies the general error paths of fflush()+rename() file
writers.
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It is highly confusing if a getter function returns 0, but the value is
set to NULL. This, right now, triggers assertions as code relies on the
returned values to be non-NULL.
Like with sd-bus-creds and friends, return 0 only if a value is actually
available.
Discussed with Tom, and actually fixes real bugs as in #512.
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Currently, the HASHMAP iterators stop at the first NULL entry in a
hashmap. This is non-obvious and breaks users like sd-device, which
legitimately store NULL values in a hashmap.
Fix all the iterators by taking a pointer to the value storage, instead of
returning it. The iterators now return a boolean that tells whether the
end of the list was reached.
Current users of HASHMAP_FOREACH() are *NOT* changed to explicitly check
for NULL. If it turns out, there were users that inserted NULL into
hashmaps, but didn't properly check for it during iteration, then we
really want to find those and fix them.
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This was a regression introduced when moving to sd-device.
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Don't try to read it again.
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Don't clobber the sd_device struct, and don't leak memory when memory allocation fails.
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In device_update_properties_bufs(), the strv is built from pointers into the
single nul-terminated buf_nulstr string, to avoid allocating the key=value
strings twice. However, we must not do that while building and
GREEDY_REALLOC0()'ing buf_nulstr, as each time when this actually reallocates
memory the pointers we wrote into buf_strv so far become invalid.
So change the logic to first completely build the new buf_nulstr, and then
iterate over it to pick out the pointers to the individual key=value strings
for properties_strv.
This fixes invalid environment for udev callouts.
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This was a regression that broke
$ udevadm trigger -nv --property-match=DEVNAME=/dev/sda1 --attr-match=size=409600
Reported by David Reisner.
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A NULL pointer was inserted as the first element of the strv.
This had the effect of always passing the empty environment to processes
spawned by udev.
Reported by Michał Bartoszkiewicz.
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asprintf() does not set errno.
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If for whatever reason there was nothing to load or loading failed, don't keep trying.
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Only 'real' devices are required to have an uevent file.
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This reverts b67f944. Lazy loading of device properties does not work for devices
that are received over netlink, as these are sealed. Reinstate the unconditional
loading of the device db.
Reported by: Mantas Mikulėnas <grawity@gmail.com>.
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device
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Boolean arithmetic is great, use it!
if (a && !b)
return 1;
if (!a && b)
return -1,
is equivalent to
if (a != b)
return a - b;
Furthermore:
r = false;
if (condition)
r = true;
is equivalent to:
r = condition;
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sd_device_new_from_* now returns -ENODEV when the device does not exist, and the enumerator
silently drops these errors as missing devices is exepected.
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It is still possible to include uninitialized ones, but now that is opt-in. In most
cases people only want initialized devices. Exception is if you want to work without
udev running.
Suggested by David Herrmann.
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This is rarely, if ever, used. Drop it from the new public API and only keep it for
the legacy API.
Suggested by David Herrmann.
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Right now, we always drop the last character of all values we write to
sysfs. Fix this!
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