Add some functions to fd.c for the convenience of extensions.

For example, if you want to perform an ioctl() on a file descriptor
opened through the fd.c routines, there's no way to do that without
being able to get at the underlying fd.

KaiGai Kohei

1 files changed, 34 insertions, 0 deletions

diff --git a/src/backend/storage/file/fd.c b/src/backend/storage/file/fd.c
index 1b301001f09..37a2ae6b643 100644
--- a/src/backend/storage/file/fd.c
+++ b/src/backend/storage/file/fd.c
@@ -1577,6 +1577,40 @@ FilePathName(File file)
 	return VfdCache[file].fileName;
 }
 
+/*
+ * Return the raw file descriptor of an opened file.
+ *
+ * The returned file descriptor will be valid until the file is closed, but
+ * there are a lot of things that can make that happen.  So the caller should
+ * be careful not to do much of anything else before it finishes using the
+ * returned file descriptor.
+ */
+int
+FileGetRawDesc(File file)
+{
+	Assert(FileIsValid(file));
+	return VfdCache[file].fd;
+}
+
+/*
+ * FileGetRawFlags - returns the file flags on open(2)
+ */
+int
+FileGetRawFlags(File file)
+{
+	Assert(FileIsValid(file));
+	return VfdCache[file].fileFlags;
+}
+
+/*
+ * FileGetRawMode - returns the mode bitmask passed to open(2)
+ */
+int
+FileGetRawMode(File file)
+{
+	Assert(FileIsValid(file));
+	return VfdCache[file].fileMode;
+}
 
 /*
  * Make room for another allocatedDescs[] array entry if needed and possible.