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authorDan Nichilson <dnicholson@linuxfromscratch.org>2006-07-12 15:40:52 +0000
committerDan Nichilson <dnicholson@linuxfromscratch.org>2006-07-12 15:40:52 +0000
commita263c7ad8c5c8c85ffde0cea5887accbc4697a1a (patch)
treebe542d6b10e342bf4889b48a02a5f97484dfa375 /chapter06/udev.xml
parentcd2f7f0340a0ecf15ed8ba99c1e71dcd25cfec0a (diff)
Updated to udev-096 and udev-config-20060712. Closes #1804.
git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@7659 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689
Diffstat (limited to 'chapter06/udev.xml')
-rw-r--r--chapter06/udev.xml76
1 files changed, 3 insertions, 73 deletions
diff --git a/chapter06/udev.xml b/chapter06/udev.xml
index a7ad15fb4..a78e8c774 100644
--- a/chapter06/udev.xml
+++ b/chapter06/udev.xml
@@ -94,87 +94,17 @@ ln -sv /proc/kcore /lib/udev/devices/core</userinput></screen>
</variablelist>
- <para>Udev's configuration is far from ideal by default, so install
- the configuration files here:</para>
+ <para>Udev has to be configured in order to work properly, and does
+ not come with any sort of "default" configuration. Install the
+ LFS-specific configuration files:</para>
-<!-- FIXME: 90-bug.rules should be removed from the tarball once the book is released -->
<screen><userinput>cp -v &udev-config;/[0-9]* /etc/udev/rules.d/</userinput></screen>
- <para>Now install a helper script that is not included in the main Udev
- tarball:</para>
-
-<screen><userinput>install -v -m 744 &udev-config;/write_cd_aliases /lib/udev/</userinput></screen>
-
<para>Install the documentation that explains how to create Udev rules:</para>
<screen><userinput>install -m644 -D -v docs/writing_udev_rules/index.html \
/usr/share/doc/udev-&udev-version;/index.html</userinput></screen>
- <important>
-
- <para>When Udev is started by the LFS-Bootscripts, a replay of all kernel
- device events happens. These events tell Udev what devices exist.
- Sometimes the Udev bootscript doesn't wait long enough for
- <command>udevd</command> to process all of the replayed events and
- consequently the devices for those missed events are not created before the
- script exits. Since <command>udevd</command> is still running in the
- background, the devices will be created a few milliseconds later, but the
- next bootscript to run may require a device to exist before it has been
- created. To avoid such missed events, and to avoid hardcoding an overly
- long wait time, It is recommended that you run the following commands to
- aid the LFS development team in debugging these missed events and finding
- an acceptable solution more quickly.</para>
-
- <para>First, create a simple C file:</para>
-
-<screen><userinput>cat &gt; bug.c &lt;&lt; EOF
-<literal>/* Simple event recorder */
-#define _GNU_SOURCE
-#include &lt;sys/types.h&gt;
-#include &lt;sys/stat.h&gt;
-#include &lt;fcntl.h&gt;
-#include &lt;unistd.h&gt;
-#include &lt;stdlib.h&gt;
-#include &lt;argz.h&gt;
-int main(int argc, char * argv[])
-{
- char * envar;
- char * envz;
- size_t len;
- int bug;
- bug = open("/dev/bug", O_WRONLY | O_APPEND);
- if (bug == -1)
- return 0;
-
- /* Ignore everything USB-related to avoid spamming the list */
- envar = getenv("PHYSDEVPATH");
- if (envar &amp;&amp; strstr(envar, "usb"))
- return 0;
- envar = getenv("DEVPATH");
- if (envar &amp;&amp; strstr(envar, "usb"))
- return 0;
-
- setenv("_SEPARATOR", "-------------------------------", 1);
- argz_create(environ, &amp;envz, &amp;len);
- argz_stringify(envz, len, '\n');
- envz[len-1]='\n';
- write(bug, envz, len);
- close(bug);
- free(envz);
- return 0;
-}</literal>
-EOF</userinput></screen>
-
- <para>Now compile it:</para>
-
-<screen><userinput>gcc -o /lib/udev/bug bug.c</userinput></screen>
-
- <para>When booting the new LFS system, if any events are missed, a warning
- message will appear and a <filename>/dev/bugreport</filename> file will be
- created. The warning message will tell you where to send feedback.</para>
-
- </important>
-
</sect2>
<sect2 id="contents-udev" role="content">