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Support for converting OpenOptions to c_int on UNIX #74943

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@withoutboats

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@withoutboats

AFAICT, there's no public API for converting OpenOptions to c_int on UNIX platforms, meaning you cannot use an OpenOptions to open a file yourself using a lower level API from C. For example, this means that I cannot just re-use the OpenOptions type from std in ringbahn, which opens a file using io-uring instead of using the open syscall.

Some way under std::os::unix to convert OpenOptions to c_int would be helpful to avoid duplication. Ideally it would be a method on OpenOptionsExt, but I'm not sure how that could be non-breaking since there is no obvious default implementation. It may just have to be a free function.

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    A-ioArea: `std::io`, `std::fs`, `std::net` and `std::path`C-feature-requestCategory: A feature request, i.e: not implemented / a PR.T-libs-apiRelevant to the library API team, which will review and decide on the PR/issue.

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