From 7bc48f847670293d1acb70c7dcbceaf55fef1e40 Mon Sep 17 00:00:00 2001
From: Hsieh Chin Fan <typebrook@gmail.com>
Date: Fri, 15 Apr 2022 12:54:20 +0800
Subject: Update

---
 tools/unix/fdswap | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)
 create mode 100755 tools/unix/fdswap

(limited to 'tools/unix')

diff --git a/tools/unix/fdswap b/tools/unix/fdswap
new file mode 100755
index 0000000..8b7d0bd
--- /dev/null
+++ b/tools/unix/fdswap
@@ -0,0 +1,35 @@
+#!/bin/bash
+#
+# fdswap
+#
+if [ "$2" = "" ]; then 
+	echo "
+    Usage: $0 /path/to/oldfile /path/to/newfile [pids]
+    Example: $0 /var/log/daemon.log /var/log/newvolume/daemon.log 1234
+    Example: $0 /dev/pts/53 /dev/null 2345"; exit 0
+fi
+
+if gdb --version > /dev/null 2>&1; then true
+else echo "Unable to find gdb."; exit 1
+fi
+
+src="$1"; dst="$2"; shift; shift 
+pids=$* 
+
+for pid in ${pids:=$( /sbin/fuser $src | cut -d ':' -f 2 )}; 
+do
+    echo "src=$src, dst=$dst"
+    echo "$src has $pid using it" 
+    cmd=$(mktemp)
+    { 
+        echo "attach $pid" 
+        echo 'call (int)open("'$dst'", 66, 0666)'
+        for ufd in $(LANG=C ls -l /proc/$pid/fd | \
+        grep "$src"\$ | awk ' { print $9; } '); 
+        do echo 'call (int)dup2($1,'"$ufd"')'; done 
+        echo 'call (int)close($1)'
+        echo 'detach'; echo 'quit' 
+        sleep 5
+    } | tee /dev/tty >$cmd
+    gdb -x $cmd
+done
-- 
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