[rrd-developers] rrd_open.c: mremap not portable, /trunk build broken

[Daniel.Pocock at barclayscapital.com]

> oops thanks for picking this up ... I have reverted r1601 and r1606
> 
> @daniel, please resubmit without mremap dependency ...
> 

The https method for SVN works for me, thanks for providing that

Now using munmap followed by a new call to mmap

This has a few consequences:

- The effects of any previous madvise calls will be lost, it should only
be an issue for rrd_create though as nothing else should append the rrd
file.

- Any pointers made from rrd_file_t.file_start will become invalid - I
couldn't find any other code using this pointer, however, I will submit
another patch later that buries the pointer and file descriptor so that
it is less likely that someone uses them outside rrd_open.c

Regards,

Daniel

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