1 files changed, 33 insertions, 0 deletions
diff --git a/vespalib/src/vespa/fastos/file_rw_ops.h b/vespalib/src/vespa/fastos/file_rw_ops.h
new file mode 100644
index 00000000000..4f7aa6f082f
--- /dev/null
+++ b/vespalib/src/vespa/fastos/file_rw_ops.h
@@ -0,0 +1,33 @@
+// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+
+#pragma once
+
+#include <sys/types.h>
+
+
+namespace fastos {
+
+/*
+ * Class handling pointers to functions used by FastOS_File for read
+ * and writa access. Unit tests might modify pointers to inject errors.
+ */
+class File_RW_Ops
+{
+    using ReadFunc = ssize_t (*)(int fd, void* buf, size_t count);
+    using WriteFunc = ssize_t (*)(int fd, const void* buf, size_t count);
+    using PreadFunc = ssize_t (*)(int fd, void* buf, size_t count, off_t offset);
+    using PwriteFunc = ssize_t (*)(int fd, const void* buf, size_t count, off_t offset);
+
+public:
+    static ReadFunc _read;
+    static WriteFunc _write;
+    static PreadFunc _pread;
+    static PwriteFunc _pwrite;
+
+    static ssize_t read(int fd, void* buf, size_t count) { return _read(fd, buf, count); }
+    static ssize_t write(int fd, const void* buf, size_t count) { return _write(fd, buf, count); }
+    static ssize_t pread(int fd, void* buf, size_t count, off_t offset) { return _pread(fd, buf, count, offset); }
+    static ssize_t pwrite(int fd, const void* buf, size_t count, off_t offset) { return _pwrite(fd, buf, count, offset); }
+};
+
+}