1 files changed, 44 insertions, 0 deletions
diff --git a/src/port/win32pread.c b/src/port/win32pread.c
new file mode 100644
index 00000000000..7058c3460b5
--- /dev/null
+++ b/src/port/win32pread.c
@@ -0,0 +1,44 @@
+/*-------------------------------------------------------------------------
+ *
+ * win32pread.c
+ *	  Implementation of pread(2) for Windows.
+ *
+ * Portions Copyright (c) 1996-2022, PostgreSQL Global Development Group
+ *
+ * IDENTIFICATION
+ *	  src/port/win32pread.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+
+#include "postgres.h"
+
+#include <windows.h>
+
+ssize_t
+pread(int fd, void *buf, size_t size, off_t offset)
+{
+	OVERLAPPED	overlapped = {0};
+	HANDLE		handle;
+	DWORD		result;
+
+	handle = (HANDLE) _get_osfhandle(fd);
+	if (handle == INVALID_HANDLE_VALUE)
+	{
+		errno = EBADF;
+		return -1;
+	}
+
+	overlapped.Offset = offset;
+	if (!ReadFile(handle, buf, size, &result, &overlapped))
+	{
+		if (GetLastError() == ERROR_HANDLE_EOF)
+			return 0;
+
+		_dosmaperr(GetLastError());
+		return -1;
+	}
+
+	return result;
+}