File tapdisk-ioemu-logfile.patch of Package xen.481

From 903a145f3eace5e3ae914f0335ab6c4e33635d2f Mon Sep 17 00:00:00 2001
From: Kevin Wolf <kwolf@suse.de>
Date: Tue, 10 Mar 2009 16:36:23 +0100
Subject: [PATCH 4/6] tapdisk-ioemu: Write messages to a logfile

Typically, tapdisk-ioemu runs as a daemon and messages to stderr are
simply lost. Write them to a logfile instead.

Signed-off-by: Kevin Wolf <kwolf@suse.de>
---
 tapdisk-ioemu.c |   19 +++++++++++++------
 1 files changed, 13 insertions(+), 6 deletions(-)

Index: xen-4.2.0-testing/tools/qemu-xen-traditional-dir-remote/tapdisk-ioemu.c
===================================================================
--- xen-4.2.0-testing.orig/tools/qemu-xen-traditional-dir-remote/tapdisk-ioemu.c
+++ xen-4.2.0-testing/tools/qemu-xen-traditional-dir-remote/tapdisk-ioemu.c
@@ -78,15 +78,22 @@ int main(void)
     struct timeval tv;
     void *old_fd_start = NULL;
 
-    logfile = stderr;
-    
+    /* Daemonize */
+    if (fork() != 0)
+        exit(0);
+
     bdrv_init();
     init_blktap();
 
-    /* Daemonize */
-    if (fork() != 0)
-    	exit(0);
-   
+    logfile = fopen("/var/log/xen/tapdisk-ioemu.log", "a");
+    if (logfile) {
+        setbuf(logfile, NULL);
+        fclose(stderr);
+        stderr = logfile;
+    } else {
+        logfile = stderr;
+    }
+
     /* 
      * Main loop: Pass events to the corrsponding handlers and check for
      * completed aio operations.