Author: jim
Date: 2006-08-31 17:48:36 -0600 (Thu, 31 Aug 2006)
New Revision: 2376
Added:
branches/clfs-1.0/BOOK/final-system/multilib/multiarch_wrapper.xml
Modified:
/
Log:
[EMAIL PROTECTED] (orig r2513): jciccone | 2006-08-31 13:31:32 -0700
Added missing file.
Property changes on:
___________________________________________________________________
Name: svk:merge
- b6734a72-470d-0410-b049-f317dca95413:/:2512
+ b6734a72-470d-0410-b049-f317dca95413:/:2513
Added: branches/clfs-1.0/BOOK/final-system/multilib/multiarch_wrapper.xml
===================================================================
--- branches/clfs-1.0/BOOK/final-system/multilib/multiarch_wrapper.xml
(rev 0)
+++ branches/clfs-1.0/BOOK/final-system/multilib/multiarch_wrapper.xml
2006-08-31 23:48:36 UTC (rev 2376)
@@ -0,0 +1,125 @@
+<?xml version="1.0" encoding="ISO-8859-1"?>
+<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN"
+ "http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd"; [
+ <!ENTITY % general-entities SYSTEM "../../general.ent">
+ %general-entities;
+]>
+
+<sect1 id="ch-system-multiarch-wrapper" role="wrap">
+ <?dbhtml filename="multiarch_wrapper.html"?>
+
+ <title>Creating a Muliarch Wrapper</title>
+
+ <indexterm zone="ch-system-multiarch-wrapper">
+ <primary sortas="a-File">Multiarch Wrapper</primary>
+ </indexterm>
+
+ <sect2 role="package">
+ <title/>
+
+ <para>The Multiarch Wrapper is used to wrap certain binaries that have
+ hardcoded paths to libraries or are architecture specific.</para>
+
+ </sect2>
+
+ <sect2 role="installation">
+ <title>Installation of The Multiarch Wrapper</title>
+
+ <para os="a">Create the source file:</para>
+
+<screen os="b"><userinput>cat > multiarch_wrapper.c << "EOF"
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+
+#ifndef DEFAULT_ARCH
+# define DEFAULT_ARCH "64"
+#endif
+
+int main (int argc, char *argv[])
+{
+ char *use_arch;
+ if ((use_arch = getenv("USE_ARCH")) == NULL)
+ use_arch = DEFAULT_ARCH;
+
+ char *filename = malloc(strlen(argv[0]) + strlen(use_arch) + 2);
+ strcpy(filename, argv[0]);
+ strcat(filename, "-");
+ strcat(filename, use_arch);
+
+ int ret = execvp(filename, argv);
+ if ((ret != 0)&&(errno != 0))
+ {
+ char *errmsg = malloc(strlen(filename) + 19);
+ strcpy(errmsg, "Unable to execute ");
+ strcat(errmsg, filename);
+ perror(errmsg);
+ free(errmsg);
+ }
+
+ free(filename);
+
+ return ret;
+}
+EOF</userinput></screen>
+
+ <para os="c">Compile and Install the Multiarch Wrapper:</para>
+
+<screen os="d"><userinput>gcc ${BUILD64} multiarch_wrapper.c -o
/usr/bin/multiarch_wrapper</userinput></screen>
+
+ <para os="e">This multiarch wrapper is going to be used later on in the
book
+ with perl. It will also be very useful outside of the base CLFS
system.</para>
+
+ <para os="f">Creating the testcase:</para>
+
+<screen os="g"><userinput>echo 'echo "32bit Version"' > test-32
+echo 'echo "64bit Version"' > test-64
+chmod 755 test-32 test-64
+ln -sv /usr/bin/multiarch_wrapper test</userinput></screen>
+
+ <para os="h">Testing the wrapper:</para>
+
+<screen os="i"><userinput>USE_ARCH=32 ./test
+USE_ARCH=64 ./test</userinput></screen>
+
+ <para os="j">The output of the above command should be:</para>
+
+<screen os="k"><userinput>32bit Version
+64bit Version</userinput></screen>
+
+ </sect2>
+
+ <sect2 id="contents-multiarch-wrapper" role="content">
+ <title>Contents of The Multiarch Wrapper</title>
+
+ <segmentedlist>
+ <segtitle>Installed programs</segtitle>
+
+ <seglistitem>
+ <seg>multiarch_wrapper</seg>
+ </seglistitem>
+ </segmentedlist>
+
+ <variablelist>
+ <bridgehead renderas="sect3">Short Descriptions</bridgehead>
+ <?dbfo list-presentation="list"?>
+ <?dbhtml list-presentation="table"?>
+
+ <varlistentry id="multiarch_wrapper">
+ <term><command>multiarch_wrapper</command></term>
+ <listitem>
+ <para>Will execute a different program based on the
+ <envar>USE_ARCH</envar> variable. The <envar>USE_ARCH</envar>
+ variable will be the suffix of the executed program.</para>
+ <indexterm zone="ch-system-multiarch-wrapper multiarch_wrapper">
+ <primary sortas="b-multiarch_wrapper">multiarch_wrapper</primary>
+ </indexterm>
+ </listitem>
+ </varlistentry>
+
+ </variablelist>
+
+ </sect2>
+
+</sect1>
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