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Here is the patch, that should prevent all of the known deadlocks with
corrupt tdb databases we discovered.
Thanks to Frank Steiner <fsteiner-mail@bio.ifi.lmu.de>, who tested all this
endlessly with a NFS mounted /dev. The conclusion is, that udev will not work
on filesystems without proper record locking, but we should prevent the
endless loops anyway. This patch implements:
o recovery from a corrupted udev database. udev will continue
without database support now, instead of doing nothing. So the node should
be generated in any case, remove will obviously not work for custom names.
o added iteration limits to the tdb-code at the places we discovered endless
loops. In the case tdb tries to find more than 100.000 entries with the
same hash, we better give up :)
o prevent a {all_partitions} loop caused by corrupt db data
o log all tdb errors to syslog
o switch sleep() to usleep() cause we want to use alarm()
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The kernel will use a u64 for the sequence number, so we want the same.
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On Tue, Sep 07, 2004 at 12:46:43PM +0200, Kay Sievers wrote:
> On Mon, 2004-09-06 at 20:18 -0700, Tom Rini wrote:
> > I noticed somewhat recently that my enet devices weren't being renamed
> > on boot anymore. I don't quite know when this got broken (or rather, if
> > it was supposed to be working. I swear it worked for me once..), but
> > the following seems to do it.
>
> I think it never worked in the udevstart case. It worked only with the
> hotplug-event-udev, I expect.
>
> > In udev_scan_class(), look for not just
> > %s/%s/dev (which everything with a dev node has), but %s/%s/dev* (both
> > of my enet devices, sis900 & 3c59x only have device) and if that
> > exists, pass this along to udev.
>
> Yeah, network devices don't have a devnode and therefore no "dev", but
> they are all in /sys/class/net/. We may just test if we are there
> instead of the "device" match.
How about something like this. It adds all the net devices without
looking at the attributes and keeps the remaining logic like it is.
It also removes certain levels of indirection and much simplifies the
udevstart process. We surely don't need to open and close the udevdb
for every node while iterating over the list. (We are about 5% faster on
my box)
It's not well tested, so it would be nice if someone can have a look
at it, before a broken udevstart renders any system unbootable.
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Hi Kay,
On 23:12 Sat 04 Sep , Kay Sievers wrote:
> Cool, a real bug :)
> Thanks, for the patch. I think it would be better to skip lenghth exceeding
> lines instead of cutting it and continue. While looking at it I restructured
> the buffer reading logic a bit and fixed another stupid bug.
Thanks for the cleanup.
You may have overlooked the fix for udev_config.c(parsing udev.conf) in
your patch. So, I've adapted the fixes you applied to namedev_parse.c
to this file also.
Also, while 'eating' the whitespace the 'count' doesn't get decremented.
This leads strncpy to copy the number of whitespace minus 1 characters
from the next line. Minus 1 because it copies '\n' from the current
line.
while (isspace(bufline[0])) {
bufline++;
+ count--;
}
.
.
.
strncpy(line, bufline, count);
Included patch(against udev-030) contains the above fixes as well as
your fixes.
Signed-off-by: Arun Bhanu <arun@codemovers.org>
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here we change udevd to pass the SEQNUM from the hotplug environment
to udev and the dev.d/ scripts. We need this for HAL to match the
hotplug event with the dev.d/ events.
It also changes the type from int to long to match the kernel.
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Hi,
The following patch makes udev/udevstart be a common binary. First,
doing this grows udev by a total of 1.8kB (ppc32, stripped) whereas
udevstart by itself is 6.4kB. I know you mentioned being able to
replace udevstart with a script, but at 1.8kB I don't think it'll be
easy to beat this with size there. Next, the following are by-eye
timings of before, after, and with devfs on a slow, but still usable
embedded platform (config stripped down to more-or-less bare for
ramdisk):
-- Embedded Planet RPX LITE, 64Mhz MPC 823e --
devfs : 15.333s, 15.253s, 14.988s (15.191s avg)
udev-pristine : 18.675s, 18.079s, 18.418s (18.390s avg)
udev-multi : 14.587s, 14.747s, 14.868s (14.734s avg)
The patch ends up being rather large to add this, as in doing so I ended
up making all refs (that I hit..) to devpath/subsystem be marked as
'const'.
Signed-off-by: Tom Rini <trini@kernel.crashing.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
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Here we change the DEVPATH for netdev's in the environment of the dev.d/
scripts to the name the device is renamed to. The original name doesn't
exist in the kernel after rename.
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Here is a patch to change the netdev handling in the database and for
the dev.d/ calls. I applies on top of the udevd.patch, cause klibc has
no sysinfo().
o netdev's are also put into our database now. I want this for the
udevruler gui to get a list of all handled devices.
All devices in the db are stamped with the system uptime value at
the creation time. 'udevinfo -d' prints it.
o the DEVPATH value is the key for udevdb, but if we rename
a netdev, the name is replaced in the kernel, so we add
the changed name to the db to match with the remove event.
NOTE: The dev.d/ scripts still get the original name from the
hotplug call. Should we replace DEVPATH with the new name too?
o We now only add a device to the db, if we have successfully created
the main node or successfully renamed a netdev. This is the main part
of the patch, cause I needed to clean the retval passing trough all
the functions used for node creation.
o DEVNODE sounds a bit ugly for netdev's so I exported DEVNAME too.
Can we change the name?
o I've added a UDEV_NO_DEVD to possibly skip the script execution
and used it in udev-test.pl.
udevstart is the same horror now, if you have scripts with logging
statements in dev.d/ it takes minutes to finish, can we skip the
scripts here too?
o The get_device_type() function is changed to be more strict, cause
'udevinfo -a -p /block/' gets a class device for it and tries to
print the major/minor values.
o bugfix, the RESULT value has now a working newline removal and a test
for this case.
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On Mon, Mar 15, 2004 at 09:28:17PM +0100, Kay Sievers wrote:
> Here is a first simple and pretty stupid try to make a simple tool for
> composing of a udev rule.
>
> It reads the udevdb to get all currently handled devices and presents a
> list, where you can choose the device to compose the rule for.
>
> The composed rule is just printed out in a window, nothing else by now.
>
> Do we want something like this?
> Nevermind, I always wanted to know, how this newt thing works :)
Here is the next step, I still can't sleep and there are to many patches
pending to make something useful :)
Cause nobody wanted to play with me, I've made a screenshot.
The device list is sorted in alphabetical order now and if there are only
a few recently discovered devices, they are placed on top of the list.
For those who want to have a look:
http://vrfy.org/projects/udev/udevruler.png
The patch applies on top of today's mmap() patch. The db format is
changed to have the file and line number of the applied rule. So it
should be easy to edit the matching rule with this beast. It compiles
with "make all udevruler".
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<rgooch@ras.ucalgary.ca>
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Here we replace the various fgets() with a mmap() call for the config
file reading, due to the reported performance problems with klibc.
Thanks to Patrick's testing, it makes a very small, close to nothing
speed gain for libc users, but a 6 times speed increase for klibc users
with a 1000 line config file.
I've created a udev_lib.[hc] for this and also moved all the generic
stuff from udev.h in there and uninlined the functions.
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Hey, I wrote the strn*() macros just 10 days ago and yesterday this trap
caught me with the %c{x} bug.
The names are misleading cause we all expect that the from field is limited by
the size argument, but we actually limit the overall size of the destination
string to prevent a overflow.
Here we rename all strn*() macros to str*max(). That should be
more self-explanatory.
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On Wed, Mar 03, 2004 at 04:56:34PM -0800, Greg KH wrote:
> On Wed, Mar 03, 2004 at 03:57:04PM -0800, Patrick Mansfield wrote:
> >
> > Here is a patch for some new tests.
>
> Applied, thanks.
Here is a small improvement, which looks much better.
Hey Pat, thanks a lot for finding the recent bug, hope this one will
not break it again :)
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Here I try to cleanup our various multifield iteration over the strings.
Inspired by our nice list.h we now have a macro to iterate over the string
and process the parts of it:
It makes the code more readable and we don't change the string while we
process it like the former strsep() does.
Example:
foreach_strpart(dev->symlink, " ", pos, len) {
if (strncmp(&dev->symlink[pos], find_name, len) != 0)
continue;
...
}
For the callout part selector %c{2} we separate now not only by space but
also newline and return characters, cause some programs may give multiline
values back. A possible RESULT match must contain wildcards for these
characters.
Also a bug in the recent udevinfo symlink query feature is fixed.
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Here is for now my last patch to the string handling for a rather
theorethical case, where the node is very very very long. :)
We have accordant to strfieldcat(to, from) now a strintcat(to, i) macro,
which appends the ascii representation of a integer to a string in a
safe way.
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Mainly a cleanup of the earlier patches with a few missing pieces
and some cosmetical changes.
I've moved the udev_init_config() to very early init, otherwise we
don't get any logging for the processing of the input. What would I
do without gdb :)
Greg, it's the 7th patch in your box to apply. I will stop now and
wait for you :)
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Here we truncate our input strings from the environment to our
defined limit. It's a bit theroretical but better check for it.
It cleans up some magic length definitions and removes the code
duplication in udev, udevtest and udevsend.
udevd needs to be killed after installation, cause the message size
is changed with this patch.
Should we do this with the 'make install', like we do with the '.udevdb'?
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As promised, here is the next round. We provide in addition to the
already used macros:
strfieldcpy(to, from)
strfieldcat(to, from)
the corresponding friends, if the size of the target is not known and
must be provided by the caller:
strnfieldcpy(to, from, maxsize)
strnfieldcat(to, from, maxsize)
and switch nearly all possibly unsafe users of strcat(), strncat(),
strcpy() and strncpy() to these safer macros.
The last known remaining issue seems the use of sprintf() and
snprintf(). I will take on it later today or tomorrow.
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On Tue, Feb 24, 2004 at 11:50:52PM +0100, Kay Sievers wrote:
> Here is the first step towards a safer string handling.
> More will follow, but for now only the easy ones :)
>
> Thanks to all who pointed this out. strncat() isn't a nice function. We
> all should remember that the destination string is not terminated if the
> given lenght is shorter than the strlen of the source string.
>
> And shame on the various implementers of strfieldcat() I found in the
> unapplied patches on this list, it's not really better than strncpy()
> and hides the real problem.
Hmm, bk didn't checked in one file, maybe I edited it again as root.
Nevermind, here is the more complete version.
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Use the new location of libsysfs header files.
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happy.
Actually, I'm happy to, startup time is much smaller...
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Here is the first try to create all partitons of a blockdevice, since
removable media devices may need to acces the expected partition to
revalidate the media.
It uses the attribute syntax introduced with the last %s{file} patch.
I'm using this with my multi-slot-flash-card-reader:
SYSFS{model}="USB Storage-SMC ", NAME{all_partitions}="smartmedia"
SYSFS{model}="USB Storage-CFC ", NAME{all_partitions}="compactflash"
SYSFS{model}="USB Storage-MSC ", NAME{all_partitions}="memorystick"
SYSFS{model}="USB Storage-MMC ", NAME{all_partitions}="multimedia"
and I get:
tree /udev/
/udev/
|-- memorystick
|-- memorystick1
|-- memorystick10
|-- memorystick11
|-- memorystick12
|-- memorystick13
|-- memorystick14
|-- memorystick15
|-- memorystick2
|-- memorystick3
|-- memorystick4
|-- memorystick5
|-- memorystick6
|-- memorystick7
|-- memorystick8
|-- memorystick9
|-- multimedia
|-- multimedia1
|-- multimedia10
|-- multimedia11
|-- multimedia12
|-- multimedia13
|-- multimedia14
|-- multimedia15
|-- multimedia2
|-- multimedia3
|-- multimedia4
|-- multimedia5
|-- multimedia6
|-- multimedia7
|-- multimedia8
|-- multimedia9
...
If needed, we can make the number of partions to create
adjustable with the attribute?
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Shouldn't we keep the temporary strings out of the database,
or is this information useful for something?
It cuts the length of the data from 628 to 275 bytes.
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Also fix up some other dependancy issues in the Makefile.
Thanks to Olaf Hering <olh@suse.de> for pointing them out.
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Also introduce boolean type for config file to use.
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Once again, patch to make logging a config option.
Reason for this (since you asked for it):
- In our setup it is easy (although still annoying) .. just edit the
ebuild, add logging support (or remove it) and rebuild. For say a
binary distro, having the logging is useful for debugging some
times, but its more a once of, or rare thing, as you do not add or
change config files every day. Sure, we can have logging by
default, but many do not want ~300 lines of extra debugging in their
logs is not pleasant, and they will complain. Rebuilding the
package for that binary package (given the users it is targeted to)
is usually not within most users grasp.
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namedev.o
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I've edited the man page today, so this is alreay included :)
Also a few more trivials:
o added the defaults to udev.conf.in
o removed class_dev from get_default_mode(), to match with Hanna's
o changed size of mode_str to MODE_SIZE
o changed a few char compares from from 0x00 to '\0'
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This patch fixes a bug where the udev database stored empty strings
for Owner and Group if they were default. This patch stores the default
value into the database if not set otherwise. See example output:
crw------- 1 root root 4, 65 Jan 16 11:13 ttyS1
P: /class/tty/ttyS1
N: ttyS1
S:
O: root
G: root
This is a bit of a hack. However, until udev supports setting the
o/g values they will be root/root anyway so the database might as
well reflect the truth instead of empty strings.
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On Thu, Jan 15, 2004 at 05:14:16AM +0100, Kay Sievers wrote:
> On Wed, Jan 14, 2004 at 01:10:43PM -0800, Greg KH wrote:
> > On Wed, Jan 14, 2004 at 02:34:26PM -0600, Clay Haapala wrote:
> > > On Wed, 14 Jan 2004, Chris Friesen spake thusly:
> > > >
> > > > Maybe for ones with a matching rule, you could print something like:
> > > >
> > > >
> > > Is the act of printing/syslogging a rule in an of itself?
> >
> > No, as currently the only way stuff ends up in the syslog is if
> > DEBUG=true is used on the build line.
> >
> > But it's sounding like we might want to change that... :)
>
> How about this in the syslog after connect/disconnect?
>
> Jan 15 05:07:45 pim udev[28007]: configured rule in '/etc/udev/udev.rules' at line 17 applied, 'video*' becomes 'video/webcam%n'
> Jan 15 05:07:45 pim udev[28007]: creating device node '/udev/video/webcam0'
> Jan 15 05:07:47 pim udev[28015]: removing device node '/udev/video/webcam0'
Here is a slightly better version. I've created a logging.h file and
moved the debug macros from udev.h in there.
If you type:
'make' - you will get a binary that prints one or two lines to syslog
if a device node is created or deleted
'make LOG=false' - you get a binary that prints asolutely nothing
'make DEBUG=true' - the same as today, it will print all debug lines
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> Hi,
> as promised yesterday, here is a patch that drops the explicit methods
> given in the udev config and implement only one type of rule.
>
> A rule now consists only of a number of keys to match. All known keys
> are valid in any combination. The former configs should work with a few
> changes:
>
> o the "<METHOD>, " at the beginning of the line should be removed
>
> o the result of the externel program is matched with RESULT= instead if ID=
> the PROGRAM= key is only valid if the program exits with zero
> (just exit with nozero in a script if the rule should not match)
>
> o rules are processed in order they appear in the file, no priority
>
> o if NAME="" is given, udev is instructed to ignore this device,
> no node will be created
>
>
> EXAMPLE:
>
> # combined BUS, SYSFS and KERNEL
> BUS="usb", KERNEL="video*", SYSFS_model="Creative Labs WebCam*", NAME="test/webcam%n"
>
> # exec script only for the first ide drive (hda), all other will be skipped
> BUS="ide", KERNEL="hda*", PROGRAM="/home/kay/src/udev.kay/extras/ide-devfs.sh %k %b %n", RESULT="hd*", NAME="%1c", SYMLINK="%2c %3c"
>
>
> The udev-test.pl and test.block works fine here.
> Please adapt your config and give it a try.
>
Here is a slightly better version of the patch.
After a conversation with Patrick, we are now able to execute the PROGRAM
and also match in all following rules with the RESULT value from this exec.
EXAMPLE:
We have 7 rules with RESULT and 2 with PROGRAM.
Only the 5th rule matches with the callout result from the exec in the 4th rule.
RULES:
PROGRAM="/bin/echo abc", RESULT="no_match", NAME="web-no-2"
KERNEL="video*", RESULT="123", NAME="web-no-3"
KERNEL="video*", RESULT="123", NAME="web-no-4"
PROGRAM="/bin/echo 123", RESULT="no_match", NAME="web-no-5"
KERNEL="video*", RESULT="123", NAME="web-yes"
RESULT:
Jan 11 23:36:52 pim udev[26050]: namedev_name_device: process rule
Jan 11 23:36:52 pim udev[26050]: namedev_name_device: check PROGRAM
Jan 11 23:36:52 pim udev[26050]: execute_program: executing '/bin/echo abc'
Jan 11 23:36:52 pim udev[26050]: execute_program: result is 'abc'
Jan 11 23:36:52 pim udev[26050]: namedev_name_device: PROGRAM returned successful
Jan 11 23:36:52 pim udev[26050]: namedev_name_device: check for RESULT dev->result='no_match', udev->program_result='abc'
Jan 11 23:36:52 pim udev[26050]: namedev_name_device: RESULT is not matching
Jan 11 23:36:52 pim udev[26050]: namedev_name_device: process rule
Jan 11 23:36:52 pim udev[26050]: namedev_name_device: check for KERNEL dev->kernel='video*' class_dev->name='video0'
Jan 11 23:36:52 pim udev[26050]: namedev_name_device: KERNEL matches
Jan 11 23:36:52 pim udev[26050]: namedev_name_device: check for RESULT dev->result='123', udev->program_result='abc'
Jan 11 23:36:52 pim udev[26050]: namedev_name_device: RESULT is not matching
Jan 11 23:36:52 pim udev[26050]: namedev_name_device: process rule
Jan 11 23:36:52 pim udev[26050]: namedev_name_device: check for KERNEL dev->kernel='video*' class_dev->name='video0'
Jan 11 23:36:52 pim udev[26050]: namedev_name_device: KERNEL matches
Jan 11 23:36:52 pim udev[26050]: namedev_name_device: check for RESULT dev->result='123', udev->program_result='abc'
Jan 11 23:36:52 pim udev[26050]: namedev_name_device: RESULT is not matching
Jan 11 23:36:52 pim udev[26050]: namedev_name_device: process rule
Jan 11 23:36:52 pim udev[26050]: namedev_name_device: check PROGRAM
Jan 11 23:36:52 pim udev[26050]: execute_program: executing '/bin/echo 123'
Jan 11 23:36:52 pim udev[26050]: execute_program: result is '123'
Jan 11 23:36:52 pim udev[26050]: namedev_name_device: PROGRAM returned successful
Jan 11 23:36:52 pim udev[26050]: namedev_name_device: check for RESULT dev->result='no_match', udev->program_result='123'
Jan 11 23:36:52 pim udev[26050]: namedev_name_device: RESULT is not matching
Jan 11 23:36:52 pim udev[26050]: namedev_name_device: process rule
Jan 11 23:36:52 pim udev[26050]: namedev_name_device: check for KERNEL dev->kernel='video*' class_dev->name='video0'
Jan 11 23:36:52 pim udev[26050]: namedev_name_device: KERNEL matches
Jan 11 23:36:52 pim udev[26050]: namedev_name_device: check for RESULT dev->result='123', udev->program_result='123'
Jan 11 23:36:52 pim udev[26050]: namedev_name_device: RESULT matches
Jan 11 23:36:52 pim udev[26050]: namedev_name_device: found matching rule, 'video*' becomes ''
Jan 11 23:36:52 pim udev[26050]: namedev_name_device: name, 'web-yes' is going to have owner='', group='', mode = 0600
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Attached is a patch that introduces the format char 'k' to be replaced with
the kernel name. I like to have it in a callout script.
I've moved the build_kernel_name() back to namedev_name_device() since
we don't expect it growing cause of 'sdaj' :)
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#ifdef crud from the main code.
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Attached is a patch against udev-008 to send out a D-BUS message when a
device node is added or removed.
Using D-BUS lingo, udev acquires the org.kernel.udev service and sends
out a NodeCreated or NodeDeleted signal on the
org.kernel.udev.NodeMonitor interface. Each signal carries two
parameters: the node in question and the corresponding sysfs path.
[Note: the D-BUS concepts of service, interface, object can be a bit
confusing at first glance]
An example program listening for these messages looks like this
#!/usr/bin/python
import dbus
import gtk
def udev_signal_received(dbus_iface, member, service, object_path, message):
[filename, sysfs_path] = message.get_args_list()
if member=='NodeCreated':
print 'Node %s created for %s'%(filename, sysfs_path)
elif member=='NodeDeleted':
print 'Node %s deleted for %s'%(filename, sysfs_path)
def main():
bus = dbus.Bus(dbus.Bus.TYPE_SYSTEM)
bus.add_signal_receiver(udev_signal_received,
'org.kernel.udev.NodeMonitor', # interface
'org.kernel.udev', # service
'/org/kernel/udev/NodeMonitor') # object
gtk.mainloop()
if __name__ == '__main__':
main()
and this is the output when hot-plugging some usb-storage.
[david@laptop udev-008]$ ~/node_monitor.py
Node /udev/sda created for /block/sda
Node /udev/sda1 created for /block/sda/sda1
Node /udev/sda1 deleted for /block/sda/sda1
Node /udev/sda deleted for /block/sda
The patch requires D-BUS 0.20 or later while the python example program
requires D-BUS from CVS as I only recently applied a patch against the
python bindings.
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> > here is a experimental symlink creation patch - for discussion,
> > in which direction we should go.
> > It is possible now to define SYMLINK= after the NAME= in udev.rules.
> > The link is relative to the node, but the path is not optimized now
> > if the node and the link are in the same nested directory.
> > Only one link is supported, cause i need to sleep now :)
> >
> > 06-simple-symlink-creation.diff
> > simple symlink creation
> > reorganized udev-remove to have access to the symlink field
> > subdir creation/removal are functions now
> > udev-test.pl tests for link creation/removal
Here is a new version with relative link target path optimization
an better tests in udev-test.pl:
LABEL, BUS="scsi", vendor="IBM-ESXS", NAME="1/2/a/b/node", SYMLINK="1/2/c/d/symlink"
Dec 7 06:48:34 pim udev[13789]: create_node: symlink 'udev-root/1/2/c/d/symlink' to node '1/2/a/b/node' requested
Dec 7 06:48:34 pim udev[13789]: create_path: created 'udev-root/1/2/c'
Dec 7 06:48:34 pim udev[13789]: create_path: created 'udev-root/1/2/c/d'
Dec 7 06:48:34 pim udev[13789]: create_node: symlink(../../a/b/node, udev-root/1/2/c/d/symlink)
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Now there are only 3 valid environment test variables. The rest can be
specified with the config file.
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the older udev.config file is now called udev.rules.
This allows us to better control configuration values, and move away from
the environment variables.
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On Tuesday 25 November 2003 00:12, Chris Larson wrote:
> udev fails to compile here unless I'm doing a KLIBC build. The reason
> appears to be that the normal limits.h in the gcc inc dir doesn't pull
> in linux/limits.h, whereas the limits.h out in the klibc include dirs
> does. I'd think it'd be best to add a #include <linux/limits.h> to
> udev.h directly, since it uses PATH_MAX.
No, don't include kernel headers directly if you can avoid it.
The problem you are referring to seems to be with old tool chains,
I have the same symptom with my s390 gcc-2.95/glibc-2.1.3.
Including <sys/param.h> instead of <limits.h> seems to fix it.
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be LSB compliant
Finally the Debian people can get off my back...
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01-overall-whitespace+debug-text-conditioning.diff
o cleanup whitespace
o clarify a few comments
o enclose all printed debug string values in ''
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After getting a number of different crashes for udev reading broken
udev.config files, I decided to try to make the parser a little
more robust.
The behaviour is changed to stop reading the configuration file
and logging the broken entry instead of silently ignoring it (is
that good? It's easy to just print and continue).
All strcpy()'s to a fixed length string are now implicitly limited
to the bounds of the target string.
I kept the -ENODEV return code for now, not sure if there should be
different ones.
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namedev.c is still a mess, that's up next after testing...
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and udev.config
the namedev name didn't really make much sense anymore...
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config variables
This will make running tests a lot simpler.
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Now we standardise on a struct udevice to pass around, and store in the
database. This cleaned up the database code a lot.
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Unix file modes should be stored in a mode_t, not a standard type. At
the moment it is actually unsigned, in fact, not a signed integer.
Attached patch does an s/int mode/mode_t mode/ and cleans up the
results.
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