Source Format Enforcement (#763)

[thirdparty/squid.git] / src / ipc / mem / Pointer.h

diff --git a/src/ipc/mem/Pointer.h b/src/ipc/mem/Pointer.h
index da183b158bbc1974edfa05c30611d6a6eedd790e..06bc36826ade553e40f5c269438fc5d2dcc88821 100644 (file)
--- a/src/ipc/mem/Pointer.h
+++ b/src/ipc/mem/Pointer.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 1996-2016 The Squid Software Foundation and contributors
+ * Copyright (C) 1996-2021 The Squid Software Foundation and contributors
  *
  * Squid software is distributed under GPLv2+ license and includes
  * contributions from numerous individuals and organizations.
@@ -34,6 +34,8 @@ public:
     static Owner *New(const char *const id, const P1 &p1, const P2 &p2, const P3 &p3);
     template <class P1, class P2, class P3, class P4>
     static Owner *New(const char *const id, const P1 &p1, const P2 &p2, const P3 &p3, const P4 &p4);
+    /// attaches to the existing shared memory segment, becoming its owner
+    static Owner *Old(const char *const id);
 
     ~Owner();
 
@@ -41,6 +43,7 @@ public:
     Class *object() { return theObject; }
 
 private:
+    explicit Owner(const char *const id);
     Owner(const char *const id, const off_t sharedSize);
 
     // not implemented
@@ -100,6 +103,14 @@ Owner<Class>::Owner(const char *const id, const off_t sharedSize):
     Must(theSegment.mem());
 }
 
+template <class Class>
+Owner<Class>::Owner(const char *const id):
+    theSegment(id), theObject(nullptr)
+{
+    theSegment.open(true);
+    Must(theSegment.mem());
+}
+
 template <class Class>
 Owner<Class>::~Owner()
 {
@@ -107,6 +118,16 @@ Owner<Class>::~Owner()
         theObject->~Class();
 }
 
+template <class Class>
+Owner<Class> *
+Owner<Class>::Old(const char *const id)
+{
+    auto owner = new Owner(id);
+    owner->theObject = reinterpret_cast<Class*>(owner->theSegment.mem());
+    Must(static_cast<off_t>(owner->theObject->sharedMemorySize()) <= owner->theSegment.size());
+    return owner;
+}
+
 template <class Class>
 Owner<Class> *
 Owner<Class>::New(const char *const id)
@@ -162,10 +183,10 @@ Owner<Class>::New(const char *const id, const P1 &p1, const P2 &p2, const P3 &p3
 template <class Class>
 Object<Class>::Object(const char *const id): theSegment(id)
 {
-    theSegment.open();
+    theSegment.open(false);
     Must(theSegment.mem());
     theObject = reinterpret_cast<Class*>(theSegment.mem());
-    Must(static_cast<off_t>(theObject->sharedMemorySize()) == theSegment.size());
+    Must(static_cast<off_t>(theObject->sharedMemorySize()) <= theSegment.size());
 }
 
 template <class Class>