This can fail on linux for various reasons, such as the /proc filesystem not
being mounted. There are already many cases where we can't set up stack guards,
so just don't worry about this case and communicate that no guard was enabled.
I've confirmed that this allows the compiler to run in a chroot without /proc
mounted.
Closes#22642
Fixes#26475
I'm not sure this is enough, really, but I'm not totally clear on what specific information would be valuable here. In the original issue, the Java page was pretty decent, but now I can't think of a different way to word it, and copying their prose is of course not acceptable.
thoughts @alexcrichton @aturon @aidanhs ?
This can fail on linux for various reasons, such as the /proc filesystem not
being mounted. There are already many cases where we can't set up stack guards,
so just don't worry about this case and communicate that no guard was enabled.
I've confirmed that this allows the compiler to run in a chroot without /proc
mounted.
Closes#22642
This is the landing page for all of io, so we should have more than just
a sentence here.
r? @alexcrichton and I know @brson has been caring a lot about landing page style docs lately.
This makes the primitive descriptions on the front page read properly
as descriptions of types and not of the associated modules.
Having the primitive and module docs derived from the same source
causes problems, primarily that they can't contain hyperlinks
cross-referencing each other.
This crates dedicated private modules in `std` to document the
primitive types, then for all primitives that have a corresponding
module, puts hyperlinks in moth the primitive docs and the module docs
cross-linking each other.
This should help clear up confusion when readers find themselves on
the wrong page.
This also removes all the duplicate `#[doc(primitive)]` tags in various places (especially core), so the core docs will no longer attempt to document the primitives for now. Seems like an acceptable tradeoff to get some cleanup for std.
Having the primitive and module docs derived from the same source
causes problems, primarily that they can't contain hyperlinks
cross-referencing each other.
This crates dedicated private modules in `std` to document the
primitive types, then for all primitives that have a corresponding
module, puts hyperlinks in moth the primitive docs and the module docs
cross-linking each other.
This should help clear up confusion when readers find themselves on
the wrong page.
This commit is an implementation of [RFC 1174][rfc] which adds three new traits
to the standard library:
* `IntoRawFd` - implemented on Unix for all I/O types (files, sockets, etc)
* `IntoRawHandle` - implemented on Windows for files, processes, etc
* `IntoRawSocket` - implemented on Windows for networking types
[rfc]: https://github.com/rust-lang/rfcs/blob/master/text/1174-into-raw-fd-socket-handle-traits.mdCloses#27062
This commit is an implementation of [RFC 1174][rfc] which adds three new traits
to the standard library:
* `IntoRawFd` - implemented on Unix for all I/O types (files, sockets, etc)
* `IntoRawHandle` - implemented on Windows for files, processes, etc
* `IntoRawSocket` - implemented on Windows for networking types
[rfc]: https://github.com/rust-lang/rfcs/blob/master/text/1174-into-raw-fd-socket-handle-traits.mdCloses#27062
In general, it's undesirable to have read_to_end use a buffer with uninitialized memory, as that could lead to undefined behaviour in the event of a bad Read implementation. Since we control the implementations of Read for Stdin and File, however, it should be okay for us to specialise them to improve performance. This PR is to do that!
Adds some unsafe code to deal with creating the buffers. Since the read_to_end function needed to be used from the io and fs crates, I moved it into a newly-created sys::common::io module. Alternatively we could expose the new read_to_end functions to allow people to create their own read_to_end implementations for code they trust.
Benchmarks:
Read a 2.5MB file:
sys_common::io::tests::bench_init_file ... bench: 27,473,317 ns/iter (+/- 2,490,767)
sys_common::io::tests::bench_uninit_file ... bench: 25,611,793 ns/iter (+/- 2,137,387)
Read a buffer full of constant values
sys_common::io::tests::bench_uninitialized ... bench: 12,877,645 ns/iter (+/- 931,025)
sys_common::io::tests::bench_zeroed ... bench: 18,581,082 ns/iter (+/- 1,541,108)
So, approx a 7% speedup for file reading, which I think is worthwhile.
Yet another attempt to make the prose on the std crate page
clearer and more informative.
This does a lot of things: tightens up the opening, adds useful links
(including a link to the search bar), offers guidance on how to use
the docs, and expands the prelude docs as a useful newbie entrypoint.
r? @steveklabnik cc @aturon
Yet another attempt to make the prose on the std crate page
clearer and more informative.
This does a lot of things: tightens up the opening, adds useful links
(including a link to the search bar), offers guidance on how to use
the docs, and expands the prelude docs as a useful newbie entrypoint.
... matching the existing Index impls.
There is no reason not to if String implement DerefMut.
The code removed in `src/librustc/middle/effect.rs` was added in #9750
to prevent things like `s[0] = 0x80` where `s: String`,
but I belive became unnecessary when the Index(Mut) traits were introduced.
TLS tests have been deadlocking on the OSX bots for quite some time now and this
commit is the result of the investigation into what's going on. It turns out
that a value in TLS which is being destroyed (e.g. the destructor is run) can be
reset back to the initial state **while the destructor is running** if TLS is
re-accessed.
To fix this we stop calling drop_in_place on OSX and instead move the data to a
temporary location on the stack.
TLS tests have been deadlocking on the OSX bots for quite some time now and this
commit is the result of the investigation into what's going on. It turns out
that a value in TLS which is being destroyed (e.g. the destructor is run) can be
reset back to the initial state **while the destructor is running** if TLS is
re-accessed.
To fix this we stop calling drop_in_place on OSX and instead move the data to a
temporary location on the stack.
Use escaped byte string representation for CString Debug
Faithfully represent the contents of the CString and CStr in their Debug
impl, by treating them as byte strings with our default escaping to
ascii representation.
Add impl Debug for CStr.
Fixes#26964.
