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And this time, start running Clippy in CI
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There was a better case for using it before mem::uninitialized was
available, but not great. Even before then, mem::zeroed could've been
used instead.
Issue #373
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mem::size_of has been a const fn since Rust 1.24.0. Use it.
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Now that Nix's weird error types are eliminated, there's no reason not
to simply use Errno as the Error type.
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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
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Since they close their file descriptors on Drop, it's almost impossible
to use Clone without creating a double-close situation.
Also, check for EBADF in SignalFd::drop and Dir::drop.
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Only two instances remain:
* For the deprecated sys::socket::CmsgSpace::new. We should probably
just remove that method.
* For sys::termios::Termios::default_uninit. This will require some
more thought.
Fixes #1096
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try! is not available in Rust 2018
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I previously advocated for the latter syntax on stylistic grounds. But
it generates less efficient code, because it creates a new lambda
function for each usage. The optimizer does not combine them. This
change saves about 6KB of code.
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cc #664 (unsure if this is everything needed)
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The libc_bitflags! macro was replaced with a non-recursive one supporting
only public structs. I could not figure out how to make the old macro work
with the upgrade, so I reworked part of the bitflags! macro directly to suit
our needs, much as the original recursive macro was made. There are no uses
of this macro for non-public structs, so this is not a problem for internal code.
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Note that this is now only available for Linux as support is missing in libc
for Android (see rust-lang/libc#671).
As part of this work the SIGUSR2 signal mutex was altered to be a general
signal mutex. This is because all signal handling is shared across all threads
in the Rust test harness, so if you alter one signal, depending on whether it's
additive or may overwrite the mask for other signals, it could break the other
ones. Instead of putting this on the user, just broaden the scope of the mutex
so that any altering of signal handling needs to use it.
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Prefer libc_bitflags! over bitflags!. Prefer libc::CONSTANTS over
writing the constant manually.
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