RFR: 8202353: os::readdir should use readdir instead of readdir_r

[Kim Barrett]

> On Jul 11, 2018, at 2:31 PM, coleen.phillimore at oracle.com wrote:
> 
> 
> This looks very nice but one question:
> 
> http://cr.openjdk.java.net/~kbarrett/8202353/open.00/src/hotspot/os/linux/os_linux.cpp.udiff.html
> 
> + while (result && (ptr = readdir(dir)) != NULL) {
> 
> 
> What deallocates the dirent* memory?

That memory belongs to the DIR* dir, and is reclaimed by the closdir(dir) at the end of the function.