4.2BSD: <sys/mtio.h>
    gwyn%brl-vld at sri-unix.UUCP 
    gwyn%brl-vld at sri-unix.UUCP
       
    Sun Jan 22 00:49:14 AEST 1984
    
    
  
From:      Doug Gwyn (VLD/VMB) <gwyn at brl-vld>
_IOW is just a macro used to construct the proper TIOC*** code.  It is
defined in /usr/include/sys/ioctl.h .
    
    
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