Please provide mmap related api

[hackwaly]

I need mmap related api. Something hard to do without that.

Perhaps best place them in dart:io package.

[lrhn]

Sounds like something that would be related to dart:ffi.

[mkustermann]

Correct, withdart:ffi you can use mmap.

We have already some testing code which uses mmap, see vmspecific_highmem_32bit_test.dart.

The only caveat atm is that if libc calls fail, there's no access to the failure reason via errno atm: There's an open issue for it #38832

[mkustermann]

/cc @dcharkes

[mkustermann]

@hackwaly As mentioned above, it's already possible now to lookup mmap in libc and call it. We do not plan on adding this to any of our dart:* at this point in time. The only issue is not being able to retrieve errno for possible retries - this is already tracked at #38832.

So I hope it's ok if I close this issue.