1 files changed, 73 insertions, 0 deletions
diff --git a/docs/nspr/reference/pr_seek64.rst b/docs/nspr/reference/pr_seek64.rst
new file mode 100644
index 0000000000..3c144575dc
--- /dev/null
+++ b/docs/nspr/reference/pr_seek64.rst
@@ -0,0 +1,73 @@
+PR_Seek64
+=========
+
+Moves the current read-write file pointer by an offset expressed as a
+64-bit integer.
+
+
+Syntax
+------
+
+.. code::
+
+   #include <prio.h>
+
+   PRInt64 PR_Seek64(
+     PRFileDesc *fd,
+     PRInt64 offset,
+     PRSeekWhence whence);
+
+
+Parameters
+~~~~~~~~~~
+
+The function has the following parameters:
+
+``fd``
+   A pointer to a :ref:`PRFileDesc` object.
+``offset``
+   A value, in bytes, used with the whence parameter to set the file
+   pointer. A negative value causes seeking in the reverse direction.
+``whence``
+   A value of type :ref:`PRSeekWhence` that specifies how to interpret the
+   ``offset`` parameter in setting the file pointer associated with the
+   fd parameter. The value for the ``whence`` parameter can be one of
+   the following:
+
+    - :ref:`PR_SEEK_SET`. Sets the file pointer to the value of the
+      ``offset`` parameter.
+    - :ref:`PR_SEEK_CUR`. Sets the file pointer to its current location
+      plus the value of the ``offset`` parameter.
+    - :ref:`PR_SEEK_END`. Sets the file pointer to the size of the file
+      plus the value of the ``offset`` parameter.
+
+
+Returns
+~~~~~~~
+
+The function returns one of the following values:
+
+-  If the function completes successfully, it returns the resulting file
+   pointer location, measured in bytes from the beginning of the file.
+-  If the function fails, the file pointer remains unchanged and the
+   function returns -1. The error code can then be retrieved with
+   :ref:`PR_GetError`.
+
+
+Description
+-----------
+
+This is the idiom for obtaining the current location (expressed as a
+64-bit integer) of the file pointer for the file descriptor ``fd``:
+
+``PR_Seek64(fd, 0, PR_SEEK_CUR)``
+
+If the operating system can handle only a 32-bit file offset,
+:ref:`PR_Seek64` may fail with the error code ``PR_FILE_TOO_BIG_ERROR`` if
+the ``offset`` parameter is out of the range of a 32-bit integer.
+
+
+See Also
+--------
+
+:ref:`PR_Seek`