RFR 6307456 : UnixFileSystem_md.c use of chmod() and access() should handle EINTR signal appropriately (unix)

[Ivan Gerasimov]

Hello!

Not all the man pages agree that chmod, access and statvfs64 can be 
interrupted, but at least on some platforms they are allowed to fail 
with EINTR:  chmod(2) on MacOS, access(2) on Solaris and statvfs(3) on 
Linux.

So, it would be more accurate to wrap these up into a RESTARTABLE loop.

Also, java_io_UnixFileSystem_list was tiny-optimized to avoid 
unnecessary reallocation.

Would you please help review the fix?

BUGURL: https://bugs.openjdk.java.net/browse/JDK-6307456
WEBREV: http://cr.openjdk.java.net/~igerasim/6307456/00/webrev/

Thanks in advance!

-- 
With kind regards,
Ivan Gerasimov