mmap addr #1870
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mmap addr #1870
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Good point, updated to use |
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CHANGELOG.md
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| @@ -35,6 +35,8 @@ This project adheres to [Semantic Versioning](https://semver.org/). | |||
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| - The MSRV is now 1.56.1 | |||
| ([#1792](https://github.com/nix-rust/nix/pull/1792)) | |||
| - Passes `addr` to `sys::mmap` as `Option<NonZeroUsize>` from `*mut c_void`. | |||
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I find this wording confusing. How about this?
Suggested change
| - Passes `addr` to `sys::mmap` as `Option<NonZeroUsize>` from `*mut c_void`. | |
| - The `addr` argument to `sys::mman::mmap` is now of type `Option<NonZeroUsize>`. |
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Updated.
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Uses
Some<size_t>instead of*mut c_voidfor theaddrpassed tosys::mman::mmap.In this instance we are not usefully passing a pointer, it will never be dereferenced. We are passing a location which represents where to attach the shared memory to.
In this case
size_tbetter represents an address and not a pointer, andOption<size_t>better represents an optional argument thanNULLPTR.In C since there is no optional type this is a pointer as this allows it be null which is an alias here for
None.