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+PR_SendTo
+=========
+
+Sends bytes a socket to a specified destination.
+
+
+Syntax
+------
+
+.. code::
+
+   #include <prio.h>
+
+   PRInt32 PR_SendTo(
+     PRFileDesc *fd,
+     const void *buf,
+     PRInt32 amount,
+     PRIntn flags,
+     const PRNetAddr *addr,
+     PRIntervalTime timeout);
+
+
+Parameters
+~~~~~~~~~~
+
+The function has the following parameters:
+
+``fd``
+   A pointer to a :ref:`PRFileDesc` object representing a socket.
+``buf``
+   A pointer to a buffer containing the data to be sent.
+``amount``
+   The size of ``buf`` (in bytes).
+``flags``
+   This obsolete parameter must always be zero.
+``addr``
+   A pointer to the address of the destination.
+``timeout``
+   A value of type :ref:`PRIntervalTime` specifying the time limit for
+   completion of the receive operation.
+
+
+Returns
+~~~~~~~
+
+The function returns one of the following values:
+
+-  A positive number indicates the number of bytes successfully sent.
+-  The value -1 indicates a failure. The reason for the failure can be
+   obtained by calling :ref:`PR_GetError`.
+
+
+Description
+-----------
+
+:ref:`PR_SendTo` sends a specified number of bytes from a socket to the
+specified destination address. The calling thread blocks until all bytes
+are sent, a timeout has occurred, or there is an error.