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@@ -2,33 +2,22 @@
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<title>Mounting the proc and devpts file systems</title>
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<?dbhtml filename="proc.html" dir="chapter06"?>
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-<para>In order for certain programs to function properly, the proc and devpts
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-file systems must be available within the chroot environment.
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-As a file system can be mounted as many times and in as many places
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-as you like, it's not a problem that the these file systems are already
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-mounted on your host system -- especially so because they are virtual
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-file systems.</para>
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+<para>In order for certain programs to function properly, the
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+<emphasis>proc</emphasis> and <emphasis>devpts</emphasis> file systems must be
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+available within the chroot environment. A file system can be mounted as many
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+times and in as many places as you like, thus it's not a problem that the these
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+file systems are already mounted on your host system -- especially so because
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+they are virtual file systems.</para>
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-<para>The proc file system is mounted under
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-<filename class="directory">/proc</filename> by running the
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-following command:</para>
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+<para>The <emphasis>proc</emphasis> file system is the process information
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+pseudo-filesystem that the kernel uses to provide status information about the
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+status of the system.</para>
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-<para><screen><userinput>mount proc /proc -t proc</userinput></screen></para>
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-
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-<para>The devpts file system is mounted to <filename class="directory">/dev/pts
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-</filename> by running:</para>
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-
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-<para><screen><userinput>mount devpts /dev/pts -t devpts</userinput></screen>
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-</para>
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-
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-<para>Should this command fail with an error to the effect of:</para>
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-
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-<blockquote><screen>filesystem devpts not supported by kernel</screen></blockquote>
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+<para>The proc file system is mounted on
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+<filename class="directory">/proc</filename> by running the following
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+command:</para>
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-<para>This most likely means that your host system uses devfs, and does not
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-have the necessary support for devpts in the kernel. To work around this
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-problem, we will place the host's devfs system on top of the new /dev
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-structure later, in the section where we run the MAKEDEV script.</para>
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+<para><screen><userinput>mount proc /proc -t proc</userinput></screen></para>
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<para>You might get warning messages from the mount command, such as
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these:</para>
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@@ -40,14 +29,34 @@ not enough memory</screen></blockquote>
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isn't installed completely yet and some files are missing. The mount itself
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will be successful and that's all we care about at this point.</para>
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-<para>The last error (not enough memory) doesn't always show up. It depends
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-on your system configuration (such as the host system's Glibc version that was
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-used to compile the mount program with).</para>
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+<para>The <emphasis>devpts</emphasis> file system was mentioned earlier and is
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+now the most common way for pseudo terminals (PTYs) to be implemented.</para>
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+
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+<para>The devpts file system is mounted on
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+<filename class="directory">/dev/pts</filename> by running:</para>
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+
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+<para><screen><userinput>mount devpts /dev/pts -t devpts</userinput></screen></para>
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+
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+<para>Should this command fail with an error to the effect of:</para>
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+
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+<blockquote><screen>filesystem devpts not supported by kernel</screen></blockquote>
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-<para>Remember, if for any reason you stop working on your LFS, and
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-start again later, it's important to check that these filesystems are still
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-mounted inside the chroot environment. Otherwise, some programs might
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-end up compiled incorrectly.</para>
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+<para>The most likely cause is that your host system's kernel was compiled
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+without support for the devpts file system. You can check which file systems
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+your kernel supports by peeking into its internals with a command such as
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+<userinput>cat /proc/filesystems</userinput>. If for some reason, devpts is
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+listed there but the mount still doesn't work, check instead for a different
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+file system variety called <emphasis>devfs</emphasis>. If devfs is listed then
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+we'll be able to work around the problem by mounting the host's devfs file
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+system on top of the new <filename>/dev</filename> structure which we'll create
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+later on in the "Creating devices (Makedev)" section. If devfs was not listed,
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+do not worry because there is yet a third way to get PTYs working inside the
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+chroot environment. We'll cover this shortly in the aforementioned Makedev
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+section.</para>
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+
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+<para>Remember, if for any reason you stop working on your LFS, and start again
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+later, it's important to check that these filesystems are still mounted inside
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+the chroot environment, otherwise problems are likely to occur.</para>
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</sect1>
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Greg Schafer