RFR: 8237830: support O_CLOEXEC in os::open on other OS than Linux

[Baesken, Matthias]

New webrev :

http://cr.openjdk.java.net/~mbaesken/webrevs/8237830.1/

(one 'c' got lost somehow in the older webrev)

Best regards, Matthias


> 
> Hi David , on AIX  I see  O_CLOEXEC  since   AIX 7.1.  Seems it was not
> supported in 6.1, at least I cannot find it there .
> 
> Regarding macOS,   this thread
> 
> https://groups.google.com/forum/#!topic/golang-dev/7mmT7o9GYb4
> 
> claims it is there since  10.7 .
> Maybe someone can provide more detailed information ?
> 
> Best regards, Matthias
> 
> 
>