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Kay Sievers 5d6a1fa6e9 convert debug string arrays to functions 
On Fri, Nov 7, 2008 at 13:07, Matthias Schwarzott <zzam@gentoo.org> wrote:
> I managed to let udev-131 segfault at startup.
>
> I configured it like this:
> CFLAGS="-Wall -ggdb" ./configure --prefix=/usr --sysconfdir=/etc --exec-prefix=
>
> Running it in gdb shows it segfaults at udev-rules.c:831
>
> (gdb) run
> Starting program: /tmp/udev-131/udev/udevd
>
> Program received signal SIGSEGV, Segmentation fault.
> 0x0804ea06 in get_key (udev=0x9175008, line=0xafcdc8f0, key=0xafcdc5d8,
> op=0xafcdc5d0, value=0xafcdc5d4)
>    at udev-rules.c:831
> 831             dbg(udev, "%s '%s'-'%s'\n", operation_str[*op], *key, *value);

If compiled without optimization, the dbg() macro dereferences variables
which are not available. Convert the string array to a function, which just
returns NULL if compiled without DEBUG.
2008-11-07 15:59:58 +01:00
docs/writing_udev_rules remove outdated docs/README-gcov_for_udev 2008-10-07 18:10:35 +02:00
extras unify string replacement 2008-11-05 21:49:52 +01:00
rules rules: md - add mdadm 3 device naming 2008-11-06 08:17:33 +01:00
test libudev: device - allocate envp array only once 2008-10-26 14:31:46 +01:00
udev convert debug string arrays to functions 2008-11-07 15:59:58 +01:00
.gitignore gitignore: move *.8 to subdirs 2008-09-29 05:03:43 +02:00
autogen.sh add "devel" and "install" switches to autogen.sh 2008-11-01 20:57:22 +01:00
ChangeLog release 131 2008-11-07 02:36:20 +01:00
configure.ac pass make distcheck 2008-10-18 20:33:06 +02:00
COPYING update source file headers 2006-08-28 00:29:11 +02:00
INSTALL update INSTALL 2008-08-28 22:58:03 +02:00
Makefile.am build: include Makefile.am.inc in all Makefile.am 2008-10-01 18:02:39 +02:00
Makefile.am.inc libudev: get rid of selinux 2008-10-02 18:48:40 +02:00
NEWS release 131 2008-11-07 02:36:20 +01:00
README libudev: monitor - add event properties to udev_device 2008-09-09 14:37:36 +02:00
TODO fix list handling in enumerate and rules file sorting 2008-11-04 20:19:01 +01:00
udev.conf udevadm: control - use getopt_long() 2008-09-03 21:56:47 +02:00

README 

udev - userspace device management

For more information see the files in the docs/ directory.

Important Note:
  Integrating udev in the system has complex dependencies and differs from distro
  to distro. All major distros depend on udev these days and the system may not
  work without a properly installed version. The upstream udev project does not
  recommend to replace a distro's udev installation with the upstream version.

Requirements:
  - Version 2.6.19 of the Linux kernel for reliable operation of this release of
    udev. The kernel may have a requirement on udev too, see Documentation/Changes
    in the kernel source tree for the actual dependency.

  - The kernel must have sysfs, unix domain sockets and networking enabled.
    (unix domain sockets (CONFIG_UNIX) as a loadable kernel module may work,
    but it does not make any sense - don't complain if anything goes wrong.)

  - The proc filesystem must be mounted on /proc/, the sysfs filesystem must
    be mounted at /sys/. No other locations are supported by udev.


Operation:
  Udev creates and removes device nodes in /dev/, based on events the kernel
  sends out on device discovery or removal.

  - Very early in the boot process, the /dev/ directory should get a 'tmpfs'
    filesystem mounted, which is populated from scratch by udev. Created nodes
    or changed permissions will not survive a reboot, which is intentional.

  - The content of /lib/udev/devices/ directory which contains the nodes,
    symlinks and directories, which are always expected to be in /dev, should
    be copied over to the tmpfs mounted /dev, to provide the required nodes
    to initialize udev and continue booting.

  - The old hotplug helper /sbin/hotplug should be disabled on bootup, before
    actions like loading kernel modules are taken, which may cause a lot of
    events.

  - The udevd daemon must be started on bootup to receive netlink uevents
    from the kernel driver core.

  - All kernel events are matched against a set of specified rules in
    /lib/udev/rules.d/ which make it possible to hook into the event
    processing to load required kernel modules and setup devices. For all
    devices the kernel exports a major/minor number, udev will create a
    device node with the default kernel name, or the one specified by a
    matching udev rule.

Please direct any comment/question/concern to the linux-hotplug mailing list at:
  linux-hotplug@vger.kernel.org