234 lines
3.5 KiB
HTML
234 lines
3.5 KiB
HTML
<HTML
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><HEAD
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><TITLE
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>No getty</TITLE
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><META
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NAME="GENERATOR"
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CONTENT="Modular DocBook HTML Stylesheet Version 1.7"><LINK
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REL="HOME"
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TITLE="Remote Serial Console HOWTO"
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HREF="index.html"><LINK
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REL="UP"
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TITLE="Configure getty"
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HREF="getty.html"><LINK
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REL="PREVIOUS"
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TITLE="mingetty"
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HREF="getty-mingetty.html"><LINK
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REL="NEXT"
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TITLE="Configure incidentals"
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HREF="misc.html"></HEAD
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><BODY
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CLASS="SECTION"
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BGCOLOR="#FFFFFF"
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TEXT="#000000"
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LINK="#0000FF"
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VLINK="#840084"
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ALINK="#0000FF"
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><DIV
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CLASS="NAVHEADER"
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><TABLE
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SUMMARY="Header navigation table"
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WIDTH="100%"
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BORDER="0"
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CELLPADDING="0"
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CELLSPACING="0"
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><TR
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><TH
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COLSPAN="3"
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ALIGN="center"
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>Remote Serial Console HOWTO</TH
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></TR
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><TR
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><TD
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WIDTH="10%"
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ALIGN="left"
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VALIGN="bottom"
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><A
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HREF="getty-mingetty.html"
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ACCESSKEY="P"
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>Prev</A
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></TD
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><TD
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WIDTH="80%"
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ALIGN="center"
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VALIGN="bottom"
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>Chapter 6. Configure <SPAN
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CLASS="PRODUCTNAME"
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>getty</SPAN
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></TD
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><TD
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WIDTH="10%"
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ALIGN="right"
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VALIGN="bottom"
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><A
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HREF="misc.html"
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ACCESSKEY="N"
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>Next</A
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></TD
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></TR
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></TABLE
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><HR
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ALIGN="LEFT"
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WIDTH="100%"></DIV
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><DIV
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CLASS="SECTION"
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><H1
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CLASS="SECTION"
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><A
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NAME="GETTY-NONE"
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></A
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>6.6. No <SPAN
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CLASS="PRODUCTNAME"
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>getty</SPAN
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></H1
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><P
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>If you are using serial console simply to print console
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messages then do not run a <SPAN
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CLASS="APPLICATION"
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>getty</SPAN
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> process
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on the serial port.</P
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><P
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><SPAN
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CLASS="APPLICATION"
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>getty</SPAN
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> follows a locking convention
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that prevents other serial port applications from using the serial
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port. Since we do not want other processes to use the serial port,
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but are not running <SPAN
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CLASS="APPLICATION"
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>getty</SPAN
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>, manually
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create the lock file.</P
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><P
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>Create a file <TT
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CLASS="FILENAME"
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>/var/lock/LCK..ttyS0</TT
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> to
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contain the text <TT
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CLASS="LITERAL"
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>1</TT
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>. This lets other potential
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serial port applications know that process 1 has the serial port in
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use. Process 1 is always the <SPAN
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CLASS="APPLICATION"
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>init</SPAN
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>
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process, and <SPAN
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CLASS="APPLICATION"
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>init</SPAN
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> is always running, so
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the serial port is always locked.</P
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><P
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>The file is created upon each system boot, as lock files are
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often cleared when the system boots. A convenient place to create
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the lock file is from <TT
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CLASS="FILENAME"
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>/etc/rc.serial</TT
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>. It
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should contain:</P
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><DIV
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CLASS="FIGURE"
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><A
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NAME="GETTY-NONE-RCSERIAL"
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></A
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><P
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><B
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>Figure 6-11. Contents of <TT
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CLASS="FILENAME"
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>/etc/rc.serial</TT
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> to lock
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console serial port when no <SPAN
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CLASS="APPLICATION"
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>getty</SPAN
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>
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used</B
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></P
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><TABLE
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BORDER="0"
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BGCOLOR="#E0E0E0"
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WIDTH="100%"
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><TR
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><TD
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><FONT
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COLOR="#000000"
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><PRE
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CLASS="PROGRAMLISTING"
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># Lock /dev/ttyS0 as it is used by an output-only console
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(umask 022 && \
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rm -f '/var/lock/LCK..ttyS0' && \
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echo '1' > '/var/lock/LCK..ttyS0')</PRE
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></FONT
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></TD
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></TR
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></TABLE
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></DIV
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></DIV
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><DIV
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CLASS="NAVFOOTER"
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><HR
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ALIGN="LEFT"
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WIDTH="100%"><TABLE
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SUMMARY="Footer navigation table"
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WIDTH="100%"
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BORDER="0"
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CELLPADDING="0"
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CELLSPACING="0"
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><TR
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><TD
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WIDTH="33%"
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ALIGN="left"
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VALIGN="top"
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><A
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HREF="getty-mingetty.html"
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ACCESSKEY="P"
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>Prev</A
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></TD
|
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><TD
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WIDTH="34%"
|
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ALIGN="center"
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VALIGN="top"
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><A
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HREF="index.html"
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ACCESSKEY="H"
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>Home</A
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></TD
|
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><TD
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WIDTH="33%"
|
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ALIGN="right"
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VALIGN="top"
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><A
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HREF="misc.html"
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ACCESSKEY="N"
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>Next</A
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></TD
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></TR
|
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><TR
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><TD
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WIDTH="33%"
|
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ALIGN="left"
|
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VALIGN="top"
|
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><SPAN
|
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CLASS="PRODUCTNAME"
|
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>mingetty</SPAN
|
|
></TD
|
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><TD
|
|
WIDTH="34%"
|
|
ALIGN="center"
|
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VALIGN="top"
|
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><A
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HREF="getty.html"
|
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ACCESSKEY="U"
|
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>Up</A
|
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></TD
|
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><TD
|
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WIDTH="33%"
|
|
ALIGN="right"
|
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VALIGN="top"
|
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>Configure incidentals</TD
|
|
></TR
|
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></TABLE
|
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></DIV
|
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></BODY
|
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></HTML
|
|
> |