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+PR_Write
+========
+
+Writes a buffer of data to a file or socket.
+
+
+Syntax
+------
+
+.. code::
+
+   #include <prio.h>
+
+   PRInt32 PR_Write(
+     PRFileDesc *fd,
+     const void *buf,
+     PRInt32 amount);
+
+
+Parameters
+~~~~~~~~~~
+
+The function has the following parameters:
+
+``fd``
+   A pointer to the :ref:`PRFileDesc` object for a file or socket.
+``buf``
+   A pointer to the buffer holding the data to be written.
+``amount``
+   The amount of data, in bytes, to be written from the buffer.
+
+
+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 is obtained by calling :ref:`PR_GetError`.
+
+
+Description
+-----------
+
+The thread invoking :ref:`PR_Write` blocks until all the data is written or
+the write operation fails. Therefore, the return value is equal to
+either ``amount`` (success) or -1 (failure). Note that if :ref:`PR_Write`
+returns -1, some data (less than ``amount`` bytes) may have been written
+before an error occurred.