Alan Cox wrote:
Yes, there was some version of the Posix standard in that time frame.
It was just incomplete and described some mythical system that matched
no existing BSD or SysV flavor, so it was mostly ignored. Sort of like
Not really the case.
POSIX described a set of behaviours that were Unixlike and could be
relied upon.
Except that when they were written, no system exactly matched what they
specified so you couldn't rely on them to work although they might have
been useful to point fingers at the non-complying implementations.
What it covered was far less than Unix and it took great
care to indicate what was not to be relied upon and in time SuS and
similar specs expanded on this by introducing new functions where
commonality was needed and the existing interfaces were deficient -
obvious examples include termios and sigaction.
POSIX was and is very important but the basic core of posix isn't about
'being Unix' it is about fundamental things like
write/lseek/open/mkdir ...
It's all somewhat academic until you have enough that a program actually
works on more than one platform. I think the 1995 version started to
get there. I'm not sure which one Windows NT used as it's checklist
item to claim conformance.
--
Les Mikesell
lesmikesell@xxxxxxxxx
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