select() for SCO XENIX.

[Dave Hammond]

In article <40 at elgar.UUCP> ag at elgar.UUCP (Keith Gabryelski) bares
the truth about SCO's as-yet-unimplemented select() syscall.

On further investigation, I found the macros used to manipulate select()
file descriptor sets (FD_SET, FD_CLR, FD_ZERO, FD_ISSET) are already
present in <sys/types.h>.

--
Dave Hammond
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