1 files changed, 91 insertions, 0 deletions
diff --git a/xpcom/build/PoisonIOInterposer.h b/xpcom/build/PoisonIOInterposer.h
new file mode 100644
index 0000000000..4a4d1426db
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+++ b/xpcom/build/PoisonIOInterposer.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_PoisonIOInterposer_h
+#define mozilla_PoisonIOInterposer_h
+
+#include "mozilla/Types.h"
+#include <stdio.h>
+
+MOZ_BEGIN_EXTERN_C
+
+/** Register file handle to be ignored by poisoning IO interposer. This function
+ * and the corresponding UnRegister function are necessary for exchange of handles
+ * between binaries not using the same CRT on Windows (which happens when one of
+ * them links the static CRT). In such cases, giving file descriptors or FILEs
+ * doesn't work because _get_osfhandle fails with "invalid parameter". */
+void MozillaRegisterDebugHandle(intptr_t aHandle);
+
+/** Register file descriptor to be ignored by poisoning IO interposer */
+void MozillaRegisterDebugFD(int aFd);
+
+/** Register file to be ignored by poisoning IO interposer */
+void MozillaRegisterDebugFILE(FILE* aFile);
+
+/** Unregister file handle from being ignored by poisoning IO interposer */
+void MozillaUnRegisterDebugHandle(intptr_t aHandle);
+
+/** Unregister file descriptor from being ignored by poisoning IO interposer */
+void MozillaUnRegisterDebugFD(int aFd);
+
+/** Unregister file from being ignored by poisoning IO interposer */
+void MozillaUnRegisterDebugFILE(FILE* aFile);
+
+MOZ_END_EXTERN_C
+
+#if defined(XP_WIN) || defined(XP_MACOSX)
+
+#ifdef __cplusplus
+namespace mozilla {
+
+/**
+ * Check if a file is registered as a debug file.
+ */
+bool IsDebugFile(intptr_t aFileID);
+
+/**
+ * Initialize IO poisoning, this is only safe to do on the main-thread when no
+ * other threads are running.
+ *
+ * Please, note that this probably has performance implications as all
+ */
+void InitPoisonIOInterposer();
+
+#ifdef XP_MACOSX
+/**
+ * Check that writes are dirty before reporting I/O (Mac OS X only)
+ * This is necessary for late-write checks on Mac OS X, but reading the buffer
+ * from file to see if we're writing dirty bits is expensive, so we don't want
+ * to do this for everything else that uses
+ */
+void OnlyReportDirtyWrites();
+#endif /* XP_MACOSX */
+
+/**
+ * Clear IO poisoning, this is only safe to do on the main-thread when no other
+ * threads are running.
+ */
+void ClearPoisonIOInterposer();
+
+} // namespace mozilla
+#endif /* __cplusplus */
+
+#else /* XP_WIN || XP_MACOSX */
+
+#ifdef __cplusplus
+namespace mozilla {
+inline bool IsDebugFile(intptr_t aFileID) { return true; }
+inline void InitPoisonIOInterposer() {}
+inline void ClearPoisonIOInterposer() {}
+#ifdef XP_MACOSX
+inline void OnlyReportDirtyWrites() {}
+#endif /* XP_MACOSX */
+} // namespace mozilla
+#endif /* __cplusplus */
+
+#endif /* XP_WIN || XP_MACOSX */
+
+#endif // mozilla_PoisonIOInterposer_h