Issue 10882: add os.sendfile(). (patch provided by Ross Lagerwall)
diff --git a/Doc/library/os.rst b/Doc/library/os.rst
index 35562ca..a1aaf1e 100644
--- a/Doc/library/os.rst
+++ b/Doc/library/os.rst
@@ -775,6 +775,47 @@
:meth:`~file.readline` methods.
+.. function:: sendfile(out, in, offset, nbytes)
+ sendfile(out, in, offset, nbytes, headers=None, trailers=None, flags=0)
+
+ Copy *nbytes* bytes from file descriptor *in* to file descriptor *out*
+ starting at *offset*.
+ Return the number of bytes sent. When EOF is reached return 0.
+
+ The first function notation is supported by all platforms that define
+ :func:`sendfile`.
+
+ On Linux, if *offset* is given as ``None``, the bytes are read from the
+ current position of *in* and the position of *in* is updated.
+
+ The second case may be used on Mac OS X and FreeBSD where *headers* and
+ *trailers* are arbitrary sequences of buffers that are written before and
+ after the data from *in* is written. It returns the same as the first case.
+
+ On Mac OS X and FreeBSD, a value of 0 for *nbytes* specifies to send until
+ the end of *in* is reached.
+
+ On Solaris, *out* may be the file descriptor of a regular file or the file
+ descriptor of a socket. On all other platforms, *out* must be the file
+ descriptor of an open socket.
+
+ Availability: Unix.
+
+ .. versionadded:: 3.3
+
+
+.. data:: SF_NODISKIO
+ SF_MNOWAIT
+ SF_SYNC
+
+ Parameters to the :func:`sendfile` function, if the implementation supports
+ them.
+
+ Availability: Unix.
+
+ .. versionadded:: 3.3
+
+
.. function:: tcgetpgrp(fd)
Return the process group associated with the terminal given by *fd* (an open