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diff --git a/chapter06/proc.xml b/chapter06/proc.xml new file mode 100644 index 000000000..919abf6a8 --- /dev/null +++ b/chapter06/proc.xml @@ -0,0 +1,52 @@ +<?xml version="1.0" encoding="ISO-8859-1"?> +<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" "http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd"> +<sect1 id="ch-system-proc"> +<title>Mounting the proc and devpts file systems</title> +<?dbhtml filename="proc.html"?> + +<para>In order for certain programs to function properly, the +<emphasis>proc</emphasis> and <emphasis>devpts</emphasis> file systems must be +available within the chroot environment. The proc file system is the process +information pseudo file system through which the kernel provides information +about the status of the system. And the devpts file system is nowadays the most +common way pseudo terminals (PTYs) are implemented. Since kernel version 2.4, a +file system can be mounted as many times and in as many places as you like, +thus it's not a problem that these file systems are already mounted on your +host system, especially so because they are virtual file systems.</para> + +<para>First become <emphasis>root</emphasis>, as only <emphasis>root</emphasis> +can mount file systems in unusual places. Then check again that the LFS +environment variable is set correctly by running <userinput>echo +$LFS</userinput> and making sure it shows the path to your LFS partition's +mount point, which is <filename class="directory">/mnt/lfs</filename> if you +followed our example.</para> + +<para>Now make the mount points for these filesystems:</para> + +<screen><userinput>mkdir -p $LFS/{proc,dev/pts}</userinput></screen> + +<para>Mount the <emphasis>proc</emphasis> file system with:</para> + +<screen><userinput>mount proc $LFS/proc -t proc</userinput></screen> + +<para>And mount the <emphasis>devpts</emphasis> file system with:</para> + +<screen><userinput>mount devpts $LFS/dev/pts -t devpts</userinput></screen> + +<para>This last command might fail with an error like:</para> + +<blockquote><screen>filesystem devpts not supported by kernel</screen></blockquote> + +<para>The most likely cause for this is that your host system's kernel was +compiled without support for the devpts file system (you can check which file +systems your kernel supports with <command>cat /proc/filesystems</command>, +for example). A few PTYs are needed to be able to run the suites for Binutils +and GCC later on. If your kernel does not support devpts, do not worry, there +is another way to get them working inside the chroot environment. We'll cover +this shortly in the <xref linkend="ch-system-MAKEDEV"/> section.</para> + +<para>Remember that if for any reason you stop working on your LFS, and start +again later, it's important to check that these file systems are mounted again +before entering the chroot environment, otherwise problems could occur.</para> + +</sect1> |