* Make lock removal safe by signalling to blocked processes that the

  lock they are waiting on has become stale (we do this by writing a
  meaningless token to the unlinked file).

2 files changed, 10 insertions, 0 deletions

diff --git a/src/libutil/util.cc b/src/libutil/util.cc
index e77009321d..0af6ee149b 100644
--- a/src/libutil/util.cc
+++ b/src/libutil/util.cc
@@ -415,6 +415,15 @@ bool AutoCloseFD::isOpen()
 }
 
 
+/* Pass responsibility for closing this fd to the caller. */
+int AutoCloseFD::borrow()
+{
+    int oldFD = fd;
+    fd = -1;
+    return oldFD;
+}
+
+
 void Pipe::create()
 {
     int fds[2];
diff --git a/src/libutil/util.hh b/src/libutil/util.hh
index a79c07305d..d947c34252 100644
--- a/src/libutil/util.hh
+++ b/src/libutil/util.hh
@@ -184,6 +184,7 @@ public:
     operator int();
     void close();
     bool isOpen();
+    int borrow();
 };