I/O control operations come in two flavours:
File operations
Value Name Meaning
&4004667F FIONREAD Read number of bytes awaiting reception
&8004667E FIONBIO Select non-blocking connection
&8004667D FIOASYNC Select asynchronous connection
&8004667C FIOSETOWN Set owner of connection
&8004667B FIOGETOWN Get owner of connection
&8004667A FIORXDIR Select direct reception
&80046679 FIOSLEEPTW Allow sleeps in TaskWindows
Socket operations
Value Name Meaning
&80047300 SIOCSHIWAT Set high water mark
&40047301 SIOCGHIWAT Read high water mark
&80047302 SIOCSLOWAT Set low water mark
&40047303 SIOCGLOWAT Read low water mark
&40047307 SIOCATMARK Check if we are at OOB marker
&80047308 SIOCSPGRP Set process group
&80047309 SIOCGPGRP Read process group
Note: I've only listed Socket operations.
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