1 files changed, 79 insertions, 0 deletions
diff --git a/docs/nspr/reference/pr_writev.rst b/docs/nspr/reference/pr_writev.rst
new file mode 100644
index 0000000000..0100b72afc
--- /dev/null
+++ b/docs/nspr/reference/pr_writev.rst
@@ -0,0 +1,79 @@
+PR_Writev
+=========
+
+Writes data to a socket from multiple buffers.
+
+
+Syntax
+------
+
+.. code::
+
+   #include <prio.h>
+
+   PRInt32 PR_Writev(
+     PRFileDesc *fd,
+     PRIOVec *iov,
+     PRInt32 size,
+     PRIntervalTime timeout);
+
+   #define PR_MAX_IOVECTOR_SIZE 16
+
+
+Parameters
+~~~~~~~~~~
+
+The function has the following parameters:
+
+``fd``
+   A pointer to a :ref:`PRFileDesc` object for a socket.
+``iov``
+   An array of ``PRIOVec`` structures that describe the buffers to write
+   from.
+``size``
+   Number of ``PRIOVec`` structures in the ``iov`` array. The value of
+   this parameter must not be greater than ``PR_MAX_IOVECTOR_SIZE``. If
+   it is, the function will fail and the error will be set to
+   ``PR_BUFFER_OVERFLOW_ERROR``.
+``timeout``
+   A value of type :ref:`PRIntervalTime` describing the time limit for
+   completion of the entire write operation.
+
+
+Returns
+~~~~~~~
+
+One of the following values:
+
+-  A positive number indicates the number of bytes successfully written.
+-  The value -1 indicates that the operation failed. The reason for the
+   failure can be obtained by calling :ref:`PR_GetError`.
+
+
+Description
+-----------
+
+The thread calling :ref:`PR_Writev` blocks until all the data is written or
+the write operation fails. Therefore, the return value is equal to
+either the sum of all the buffer lengths (on success) or -1 (on
+failure). Note that if :ref:`PR_Writev` returns -1, part of the data may
+have been written before an error occurred. If the timeout parameter is
+not ``PR_INTERVAL_NO_TIMEOUT`` and all the data cannot be written in the
+specified interval, :ref:`PR_Writev` returns -1 with the error code
+``PR_IO_TIMEOUT_ERROR``.
+
+This is the type definition for ``PRIOVec``:
+
+.. code::
+
+   typedef struct PRIOVec {
+     char *iov_base;
+     int iov_len;
+   } PRIOVec;
+
+The ``PRIOVec`` structure has the following fields:
+
+``iov_base``
+   A pointer to the beginning of the buffer.
+``iov_len``
+   The size of the buffer.