In your fax application, you may want to replace the use of the standard I/O functions lseek( ), read( ) and write( ) with your own I/O functions.
To receive fax data using user-defined I/O functions, you must "OR" the rcvflag argument of the fx_rcvfax2( ) function with the IO_UIO bit. The fax library calls the user-defined seek and write functions every time fax data is written to the I/O device. The fd argument in fx_rcvfax2( ) specifies the file descriptor passed to the I/O functions.
For information on the DF_UIO structure, see Section 7.7. DF_UIO -- User-Defined I/O on page 115.
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