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Its use breaks too many things which expect to be run from independent
later rules, and is an idication that something needs to be fixed
properly instead.
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Dangling symlinks in path components return -ENOENT. Do not retry
to create the file in a loop in such case.
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On Wed, Oct 7, 2009 at 21:46, Alan Jenkins <sourcejedi.lkml@googlemail.com> wrote:
> Udev would have avoided the race prior to
>
> 82c785e "udevd: remove check for dev_t, DEVPATH_OLD takes care of that"
>
> (the "check" removed here used to serialize events based on the device
> major:minor number).
On Wed, Oct 7, 2009 at 22:31, Michael Guntsche <mike@it-loops.com> wrote:
> add /module/8250_pnp (module)
> remove /devices/platform/serial8250/tty/ttyS0 (tty)
> add /devices/pnp0/00:05/tty/ttyS0 (tty)
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On Wed, Sep 23, 2009 at 23:11, Matthias Schwarzott <zzam@gentoo.org> wrote:
> It is about ioctl failures on amd64:
> http://bugs.gentoo.org/show_bug.cgi?id=286041
>
> A bad parameter type to an ioctl() call causes udev-146 to generate "error
> getting buffer for inotify" messages in syslog. The offending code is
> roughly:
>
> ssize_t nbytes, pos;
> // ...
> ioctl(fd, FIONREAD, &nbytes);
>
> where ssize_t is 64 bits on amd64, but the kernel code for FIONREAD (at least
> through gentoo-sources-2.6.31) uses type int:
>
> p = (void __user *) arg;
> switch (cmd) {
> case FIONREAD:
> // ...
> ret = put_user(send_len, (int __user *) p);
>
> so the upper 32 bits of "nbytes" are left uninitialized, and the subsequent
> malloc(nbytes) fails unless those 32 bits happen to be zero (or the system has
> a LOT of memory).
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It is needed to prevent errors in udev from going unnoticed (e.g.
when udevd is not running).
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On 8/29/09, Florian Zumbiehl <florz@florz.de> wrote:
> Could it happen that > util_create_path() and util_delete_path()
> do run in parallel for > the same directory? After all, util_create_path()
> does handle > the case where creation of the directory happens in parallel
> to it running, so it doesn't seem all that unlikely to me ...
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With well defined and kernel-supplied node names, we no longer need
to support a possible stack of conflicting symlinks and node names.
Only symlinks with identical names can be claimed by multiple devices.
This shrinks the former /dev/.udev/names/ significantly.
Also the /dev/{block,char}/MAJ:MIN" links are excluded from the name
stack - they are unique and can not conflict.
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Thanks to Lennart for the log file!
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External programs triggered by events (via RUN=) will inherit udev's
signal mask, which is set to block all but SIGALRM. For most utilities,
this is OK, but if we start daemons from RUN=, we run into trouble
(especially as SIGCHLD is blocked).
This change saves the original sigmask when udev starts, and restores it
just before we exec() the external command.
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
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That was a mistake. The variable is needed to be set before
we parse the file. Thanks a lot to Alan Jenkins for spotting
this.
This reverts commit 710fdac1e49276683abe927472fe1b336960edd8.
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POSIX.1-2001 declares usleep() function obsolete and POSIX.1-2008
removes it.
[Kay Sievers]
- include time.h
- use const for timespec
- scsi_id: drop rand() in retry loop
- modem-probe: rename msuspend() to msleep()
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On Sun, Aug 30, 2009 at 04:36, Marco d'Itri<md@linux.it> wrote:
> inotify_add_watch may fail in udev_watch_begin, and then a link with
> name -1 is created.
> I do not know why, but it happened once on my system:
>
> lrwxrwxrwx 1 root root 27 Aug 4 11:27 -1 -> /devices/virtual/block/ram8
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With very deeply nested devices, We can not use a single file
name to carry an entire DEVPATH. Use <subsystem>:<sysname> as
the database filename, which should also simplify the handling
of devices moving around, as these values will not change but
still be unique.
For the name stack we use the <maj>:<min> now as the filename.
> On Tue, Aug 18, 2009 at 09:59:56AM -0400, Ric Wheeler wrote:
> The first is that udev grumbles during boot about "file name too long"
> like the following:
>
> Aug 17 06:49:58 megadeth udevd-event[20447]: unable to create db file
> '/dev/.udev/db/\x2fdevices\x2fpci0000:00\x2f0000:00:04.0\x2f0000:17:00.0\x2f0000:18:0a.0\x2f0000:1f:00.0\x2fhost11\x2fport-11:0\x2fexpander-11:0\x2fport-11:0:0\x2fexpander-11:1\x2fport-11:1:0\x2fexpander-11:2\x2fport-11:2:17\x2fexpander-11:3\x2fport-11:3:1\x2fend_device-11:3:1\x2fbsg\x2fend_device-11:3:1':
> File name too long
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The compat code will go away some day and CONFIG_SYSFS_DEPRECATED
kernels fail in too many setups now to be worth to support them.
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Fix spelling in docbook comments, code comments, and a local variable
name. Thanks to "ispell -h" for docbook HTML and "scspell" for source
code.
Signed-off-by: Alan Jenkins <alan-jenkins@tuffmail.co.uk>
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Instead of using multiple recursive Makefile.am files, use a single
Makefile.am that sets and builds all the basic suite of libraries and
binaries for udev. This reduces the number of files in the source tree, and
also reduces drastically the build time when using parallel-make.
With this setup, all the compile steps will be executed in parallel, and
just the linking stage will be (partially) serialised on the libraries
creation.
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If by-path / by-id links don't quite do what you want, this is a nice
clean way to extend the behaviour. Real example:
SYMLINK=="serial/by-id/usb-Novatel_Wireless_Inc*CDMA*-if00-port0", \\
SYMLINK+="cellcard"
Some users ask how to do things like this.
- create an additional link with a shorter name
- create a link which matches more loosely
(omit certain path segments e.g. serial numbers)
- change permissions on certain USB device nodes
Allow them to realize this without reading the friendly *.c files.
Signed-off-by: Alan Jenkins <alan-jenkins@tuffmail.co.uk>
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Dates aren't shown in the manpages. So they are not really useful,
and no-one is going to remember to update them.
"<refmiscinfo class="version"></refmiscinfo>" sounds even less useful.
I leave the unused "title" and "productname" tags. They could
theoretically be useful, and aren't hard to maintain. We just need to
fix the "title" for udevadm.
Signed-off-by: Alan Jenkins <alan-jenkins@tuffmail.co.uk>
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It did not work for the last couple of releases.
If RUN{record_failed}+="..." is given, a non-zero execution will mark
the event as failed. Recorded failed events can be re-triggered with:
udevadm trigger --type=failed
The failed tracking _might_ be useful for things which might not be
ready to be executed at early bootup, but a bit later when the needed
dependencies are available. In many cases though, it indicates that
something is used in a way it should not.
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$ udevadm trigger -n -v --subsystem-match=usb --sysname-match=2-1.1*
/sys/devices/pci0000:00/0000:00:1d.7/usb2/2-1/2-1.1
/sys/devices/pci0000:00/0000:00:1d.7/usb2/2-1/2-1.1/2-1.1.1
/sys/devices/pci0000:00/0000:00:1d.7/usb2/2-1/2-1.1/2-1.1.1/2-1.1.1:1.0
/sys/devices/pci0000:00/0000:00:1d.7/usb2/2-1/2-1.1/2-1.1.2
/sys/devices/pci0000:00/0000:00:1d.7/usb2/2-1/2-1.1/2-1.1.2/2-1.1.2:1.0
/sys/devices/pci0000:00/0000:00:1d.7/usb2/2-1/2-1.1/2-1.1.2/2-1.1.2:1.1
/sys/devices/pci0000:00/0000:00:1d.7/usb2/2-1/2-1.1/2-1.1:1.0
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We may need to handle SIGCHLD before the queued worker message. The last
reference, from the SIGCHLD or the worker message will clean up the worker
context. In case we receive an unexpected SIGCHLD with an error, we let
the event fail and clean up the worker context.
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Persistent network rules write out new rules files. When rules change,
we need to kill all workers to update the in-memory copy of the rules.
We need to make sure, that a worker finshes its work for all device
messages it has accepted, before it exits after a SIGTERM from the main
process.
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<zzam> kay: udevadmin info -e prints all lines with a space after the :, but the W: line
<kay> zzam: yeah, seems so, and the R: and the A:
<zzam> yeah
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Jul 8 09:36:41 udevd[663]: worker [5491] did not accept message, kill it
Jul 8 09:36:41 udevd[663]: worker [5491] unexpectedly returned with 0
Jul 8 09:36:41 udevd[663]: worker [5551] unexpectedly returned with 0
Jul 8 09:36:41 kernel: [ 156.832086] <6>udevd[663]: segfault at 4 ip 00959fbc sp bfbe7b78 error 6 in udevd[94f000+1c000]
https://bugs.launchpad.net/ubuntu/+source/udev/+bug/396957
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Private variables can be marked like:
ENV{.FOO}="bar"
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