yash-rs

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As long as we re-export items from the nix crate to use in the yash_env::System API, the correctness of our semantic versioning is at the discretion of the nix crate. To put the API under our own control, we should avoid re-exporting items from the external crate.

• Errno
  • [x] #356
  • [x] #391
• AtFlags
  • [x] #392
• FdFlag
  • [x] #393
• OFlag
  • [x] #389
• Signal
  • [x] ~~#365~~ #367
  • [x] Remove conversion between signal::Number and Signal https://github.com/magicant/yash-rs/blob/c47a0294e6eb1efba23e3d6eb91c926fb2738cb7/yash-env/src/system/virtual/signal.rs#L342 #368
• SigSet
  • [x] #368
• SigmaskHow
  • [x] #394
• FileStat
  • [ ] TBD
• SFlag
  • [ ] TBD
• TimeSpec
  • [ ] TBD
• WaitStatus
  • [ ] TBD
• Mode
  • [x] #389
    • Eliminate nix::sys::stat::Mode from yash_env::System
    • Move yash_env::system::virtual::Mode to yash_env::system::Mode
  • [x] Apply umask when creating a file in virtual system d496420d2aad27ca824cd24cd94a77963a5d9e74
  • [x] ~~Consider moving Mode formatting from yash_builtin::umask::format to yash_env::*~~
    • Unresolved question: How should we format the set-user-ID, set-group-ID, and sticky bits?