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-rw-r--r--Documentation/lguest/extract58
-rw-r--r--Documentation/lguest/lguest.c9
2 files changed, 65 insertions, 2 deletions
diff --git a/Documentation/lguest/extract b/Documentation/lguest/extract
new file mode 100644
index 00000000000..7730bb6e4b9
--- /dev/null
+++ b/Documentation/lguest/extract
@@ -0,0 +1,58 @@
+#! /bin/sh
+
+set -e
+
+PREFIX=$1
+shift
+
+trap 'rm -r $TMPDIR' 0
+TMPDIR=`mktemp -d`
+
+exec 3>/dev/null
+for f; do
+ while IFS="
+" read -r LINE; do
+ case "$LINE" in
+ *$PREFIX:[0-9]*:\**)
+ NUM=`echo "$LINE" | sed "s/.*$PREFIX:\([0-9]*\).*/\1/"`
+ if [ -f $TMPDIR/$NUM ]; then
+ echo "$TMPDIR/$NUM already exits prior to $f"
+ exit 1
+ fi
+ exec 3>>$TMPDIR/$NUM
+ echo $f | sed 's,\.\./,,g' > $TMPDIR/.$NUM
+ /bin/echo "$LINE" | sed -e "s/$PREFIX:[0-9]*//" -e "s/:\*/*/" >&3
+ ;;
+ *$PREFIX:[0-9]*)
+ NUM=`echo "$LINE" | sed "s/.*$PREFIX:\([0-9]*\).*/\1/"`
+ if [ -f $TMPDIR/$NUM ]; then
+ echo "$TMPDIR/$NUM already exits prior to $f"
+ exit 1
+ fi
+ exec 3>>$TMPDIR/$NUM
+ echo $f | sed 's,\.\./,,g' > $TMPDIR/.$NUM
+ /bin/echo "$LINE" | sed "s/$PREFIX:[0-9]*//" >&3
+ ;;
+ *:\**)
+ /bin/echo "$LINE" | sed -e "s/:\*/*/" -e "s,/\*\*/,," >&3
+ echo >&3
+ exec 3>/dev/null
+ ;;
+ *)
+ /bin/echo "$LINE" >&3
+ ;;
+ esac
+ done < $f
+ echo >&3
+ exec 3>/dev/null
+done
+
+LASTFILE=""
+for f in $TMPDIR/*; do
+ if [ "$LASTFILE" != $(cat $TMPDIR/.$(basename $f) ) ]; then
+ LASTFILE=$(cat $TMPDIR/.$(basename $f) )
+ echo "[ $LASTFILE ]"
+ fi
+ cat $f
+done
+
diff --git a/Documentation/lguest/lguest.c b/Documentation/lguest/lguest.c
index 62a8133393e..fc1bf70abfb 100644
--- a/Documentation/lguest/lguest.c
+++ b/Documentation/lguest/lguest.c
@@ -1,5 +1,10 @@
-/* Simple program to layout "physical" memory for new lguest guest.
- * Linked high to avoid likely physical memory. */
+/*P:100 This is the Launcher code, a simple program which lays out the
+ * "physical" memory for the new Guest by mapping the kernel image and the
+ * virtual devices, then reads repeatedly from /dev/lguest to run the Guest.
+ *
+ * The only trick: the Makefile links it at a high address so it will be clear
+ * of the guest memory region. It means that each Guest cannot have more than
+ * about 2.5G of memory on a normally configured Host. :*/
#define _LARGEFILE64_SOURCE
#define _GNU_SOURCE
#include <stdio.h>