diff --git a/async.c b/async.c
index ecdaf15887c6afcbfd4883b09f583505d802f3a6..85cc6410c50259398beef693ec00b649823dcde3 100644
--- a/async.c
+++ b/async.c
@@ -35,10 +35,10 @@ static struct QEMUBH *first_bh;
 struct QEMUBH {
     QEMUBHFunc *cb;
     void *opaque;
-    int scheduled;
-    int idle;
-    int deleted;
     QEMUBH *next;
+    bool scheduled;
+    bool idle;
+    bool deleted;
 };
 
 QEMUBH *qemu_bh_new(QEMUBHFunc *cb, void *opaque)
diff --git a/configure b/configure
index 3c72fa07dfb563c040403a15c4935ea7b6d017bb..c37fc5ba4f802ad1d50ba0b800020b2ead8b4c6a 100755
--- a/configure
+++ b/configure
@@ -41,8 +41,8 @@ compile_prog() {
 
 # symbolically link $1 to $2.  Portable version of "ln -sf".
 symlink() {
-  rm -f $2
-  ln -s $1 $2
+  rm -rf "$2"
+  ln -s "$1" "$2"
 }
 
 # check whether a command is available to this shell (may be either an
@@ -3427,7 +3427,7 @@ fi
 
 for d in libdis libdis-user; do
     mkdir -p $d
-    symlink $source_path/Makefile.dis $d/Makefile
+    symlink "$source_path/Makefile.dis" "$d/Makefile"
     echo > $d/config.mak
 done
 
@@ -3436,13 +3436,13 @@ if test "$linux" = "yes" ; then
   mkdir -p linux-headers
   case "$cpu" in
   i386|x86_64)
-    symlink $source_path/linux-headers/asm-x86 linux-headers/asm
+    symlink "$source_path/linux-headers/asm-x86" linux-headers/asm
     ;;
   ppcemb|ppc|ppc64)
-    symlink $source_path/linux-headers/asm-powerpc linux-headers/asm
+    symlink "$source_path/linux-headers/asm-powerpc" linux-headers/asm
     ;;
   s390x)
-    symlink $source_path/linux-headers/asm-s390 linux-headers/asm
+    symlink "$source_path/linux-headers/asm-s390" linux-headers/asm
     ;;
   esac
 fi
@@ -3498,7 +3498,7 @@ mkdir -p $target_dir/kvm
 if test "$target" = "arm-linux-user" -o "$target" = "armeb-linux-user" -o "$target" = "arm-bsd-user" -o "$target" = "armeb-bsd-user" ; then
   mkdir -p $target_dir/nwfpe
 fi
-symlink $source_path/Makefile.target $target_dir/Makefile
+symlink "$source_path/Makefile.target" "$target_dir/Makefile"
 
 
 echo "# Automatically generated by configure - do not modify" > $config_target_mak
@@ -3938,7 +3938,7 @@ do
 done
 mkdir -p $DIRS
 for f in $FILES ; do
-    if [ -e "$source_path/$f" ] && ! [ -e "$f" ]; then
+    if [ -e "$source_path/$f" ] && [ "$source_path" != `pwd` ]; then
         symlink "$source_path/$f" "$f"
     fi
 done
@@ -3961,7 +3961,7 @@ for hwlib in 32 64; do
   mkdir -p $d
   mkdir -p $d/ide
   mkdir -p $d/usb
-  symlink $source_path/Makefile.hw $d/Makefile
+  symlink "$source_path/Makefile.hw" "$d/Makefile"
   mkdir -p $d/9pfs
   echo "QEMU_CFLAGS+=-DTARGET_PHYS_ADDR_BITS=$hwlib" > $d/config.mak
 done
@@ -3969,7 +3969,6 @@ done
 if [ "$source_path" != `pwd` ]; then
     # out of tree build
     mkdir -p libcacard
-    rm -f libcacard/Makefile
     symlink "$source_path/libcacard/Makefile" libcacard/Makefile
 fi
 
@@ -3977,7 +3976,7 @@ d=libuser
 mkdir -p $d
 mkdir -p $d/trace
 mkdir -p $d/qom
-symlink $source_path/Makefile.user $d/Makefile
+symlink "$source_path/Makefile.user" "$d/Makefile"
 
 if test "$docs" = "yes" ; then
   mkdir -p QMP
diff --git a/iohandler.c b/iohandler.c
index 5640d49388b46dcb6a666a542fca2696241db57a..3c74de612b2c647b47b081f57d959e896da08e85 100644
--- a/iohandler.c
+++ b/iohandler.c
@@ -33,13 +33,13 @@
 #endif
 
 typedef struct IOHandlerRecord {
-    int fd;
     IOCanReadHandler *fd_read_poll;
     IOHandler *fd_read;
     IOHandler *fd_write;
-    int deleted;
     void *opaque;
     QLIST_ENTRY(IOHandlerRecord) next;
+    int fd;
+    bool deleted;
 } IOHandlerRecord;
 
 static QLIST_HEAD(, IOHandlerRecord) io_handlers =