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2021-07-24Constify many functionsAlan Somers
Constify most functions that can be constified. The exceptions are mostly accessors for structs that have no const constructor.
2021-07-07Overhaul Nix's error typesAlan Somers
For many of Nix's consumers it be convenient to easily convert a Nix error into a std::io::Error. That's currently not possible because of the InvalidPath, InvalidUtf8, and UnsupportedOperation types that have no equivalent in std::io::Error. However, very few of Nix's public APIs actually return those unusual errors. So a more useful API would be for Nix's standard error type to implement Into<std::io::Error>. This commit makes Error a simple NewType around Errno. For most functions it's a drop-in replacement. There are only three exceptions: * clearenv now returns a bespoke error type. It was the only Nix function whose error couldn't be cleanly mapped onto an Errno. * sys::signal::signal now returns Error(Errno::ENOTSUP) instead of Error::UnsupportedOperation when the user passes an incompatible argument to `handler`. * When a NixPath exceeds PATH_MAX, it will now return Error(Errno::ENAMETOOLONG) instead of Error::InvalidPath. In the latter two cases there is now some abiguity about whether the error code was generated by Nix or by the OS. But I think the ambiguity is worth it for the sake of being able to implement Into<io::Error>. This commit also introduces Error::Sys() as a migration aid. Previously that as an enum variant. Now it's a function, but it will work in many of the same contexts as the original. Fixes #1155
2021-05-30misc Clippy cleanupAlan Somers
* Fix race conditions in the tests. Two tests were grabbing a mutex but immediately dropping it. Thank you, Clippy. * Remove vestigial Windows support. Remove some code added to support Windows in 2015. Nix is no longer intended to ever run on Windows. * Various other minor Clippy lints.
2020-12-06Disable clock_getres on redoxNoah
2020-09-28Added clock_gettime, clock_getres, clock_settime, clock_getcpuclockidDaniil Bondarev