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issue27021 - Document SC_IOV_MAX limitation imposed by OS on os.writev. 

Patch contributed Марк Коренберг.
This commit is contained in:
Senthil Kumaran 2016-06-18 11:21:50 -07:00
parent 9305d83425
commit d37de3c41d
1 changed files with 5 additions and 1 deletions
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Doc/library/os.rst
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@ -1195,7 +1195,11 @@ or `the MSDN <https://msdn.microsoft.com/en-us/library/z0kc8e3z.aspx>`_ on Windo
.. function:: writev(fd, buffers)
Write the contents of *buffers* to file descriptor *fd*. *buffers* must be a
sequence of :term:`bytes-like objects <bytes-like object>`.
sequence of :term:`bytes-like objects <bytes-like object>`. Buffers are
processed in array order. Entire contents of first buffer is written before
proceeding to second, and so on. The operating system may set a limit
(sysconf() value SC_IOV_MAX) on the number of buffers that can be used.
:func:`~os.writev` writes the contents of each object to the file descriptor
and returns the total number of bytes written.