Summary:
[Folly] Cut old memrchr port in global namespace since it is excessively difficult to make it portable across all platforms.

Fixes: https://github.com/facebook/folly/issues/817.
Fixes: https://github.com/facebook/folly/issues/1391.

Reviewed By: Orvid

Differential Revision: D22130039

fbshipit-source-id: 43511aa95c749d5f603ff8043c438ba63d44f6c1

Summary:
D23695665 (https://github.com/facebook/folly/commit/5c3b9d59a815b94df1afed0b7e0050bb75e09178) calls functions defined by this module,
but doesn't ensure that it has been imported.

I believe this to be the reason behind this build failure:

https://github.com/facebook/watchman/pull/856/checks?check_run_id=1135919864#step:52:217

Reviewed By: chadaustin

Differential Revision: D23794292

fbshipit-source-id: 897cfac862fda7420d1c53b0976492231b53dcf8

Summary: Refine some guards to be more precise.

Reviewed By: yfeldblum, luciang

Differential Revision: D23361317

fbshipit-source-id: 806d899890c990a840c4275fb1180e45a944715d

Summary:
Instead of assuming every posix-y system has ucontext.h, detect
swapcontext's existence at build time. Android NDK provides ucontext.h
but not its corresponding functions.

Reviewed By: yfeldblum

Differential Revision: D23695665

fbshipit-source-id: 9e49c6fbf553abff6249d55c780c09cc19d0bb48

eden/edenapi and mononoke integration tests: add edenapi/tools to getdeps and use them in tests (#51)

Summary:
Pull Request resolved: https://github.com/facebookexperimental/eden/pull/51

This diff extends capabilities of CargoBuilder in getdeps so that individual manifests can be build even without workspaces. Thanks to that a build for edenapi/tools can be made and its artifacts can be used in mononoke integration tests.

Reviewed By: StanislavGlebik

Differential Revision: D23574887

fbshipit-source-id: 8a974a6b5235d36a44fe082aad55cd380d84dd09

Summary:
Use folly::get_cached_pid(), a faster getpid() replacement, in NotificationQueue.

Outline CHECK_EQ from checkPid().

Reviewed By: yfeldblum

Differential Revision: D23433868

fbshipit-source-id: 66ef0e243d74aa176a496e1ae15aeae5e67e4f5c

Summary:
Constant from: http://eel.is/c++draft/cpp.predefined#1.1

Fixes https://github.com/facebook/folly/issues/1454

Pull Request resolved: https://github.com/facebook/folly/pull/1455

Reviewed By: yfeldblum

Differential Revision: D23702274

Pulled By: Orvid

fbshipit-source-id: a08f922cc11c086362b91c93922b59c9a5c62e51

Reviewed By: krallin

Differential Revision: D23757084

fbshipit-source-id: 7e49228805e272064ad52d43141b5815eba4190a

Summary:
[Folly] Always enable fiber support in futures.

(Note: this ignores all push blocking failures!)

Reviewed By: andriigrynenko

Differential Revision: D19229519

fbshipit-source-id: f0a034e9387c5ccad676a911213fab74364ca340

Summary:
Add the ability for an AsyncGenerator to yield an error without needing to throw an exception and for consumers to retrieve the error without rethrowing the exception.

Added a new `folly::coro::co_error` type that acts as a simple wrapper around a `folly::exception_wrapper` that can be used to indicate that this value is an error.

This allows `AsyncGenerator` bodies to now `co_yield` a `co_error` as a way of completing with an error without needing to throw the exception.

For example:
```
class SomeError : public std::exception { ... };
folly::coro::AsyncGenerator<int> example() {
  co_yield 42;
  co_yield folly::coro::co_error(SomeError{});
}
```

This diff also adds support for `folly::coro::co_awaitTry()` to the `AsyncGenerator::next()` method.

For example:
```
folly::coro::Task<void> consumer() {
  folly::coro::AsyncGenerator<int> gen = example();
  folly::Try<int> result =
    co_await folly::coro::co_awaitTry(gen.next());
  // use result
}
```

Added a benchmark to compare performance of the new interfaces vs the existing throwing-based error handling.

Reviewed By: yfeldblum

Differential Revision: D18015926

fbshipit-source-id: 27d2e16e7dde9b4c871846f5d17b40ec3737330a

Summary: getVia is destructive like other forms of get. This change r-value qualifies it to highlight that in code.

Reviewed By: yfeldblum

Differential Revision: D23603722

fbshipit-source-id: d2aecac3c6eb09e0fcf55a07e310114ebc13b932

Summary: Add support for polling the io_uring submission/completion queues

Reviewed By: kevin-vigor

Differential Revision: D23566444

fbshipit-source-id: 7f8331d1f34db78dc4bca4aea3e5f5a1c8f00023

Summary:
[Folly] Tweak `partial` to avoid a poorly-understood build failure on macos with clang++ and libc++.

```
In file included from folly/functional/test/PartialTest.cpp:19:
In file included from folly/folly/Function.h:230:
folly/functional/Invoke.h:65:25: error: attempt to use a deleted function
      noexcept(noexcept(std::mem_fn(f)(static_cast<A&&>(a)...)))
                        ^
folly/functional/Partial.h:41:19: note: in instantiation of exception specification for 'operator()<int (int &, int &, int &), Foo, const Foo &, const int &, const int &, int &>' requested here
      -> decltype(invoke(
                  ^
folly/functional/Partial.h:65:56: note: while substituting deduced template arguments into function template 'invokeForward' [with Self = const folly::detail::partial::Partial<int (Foo::*)(int &, int &, int &), std::__1::tuple<Foo, int, int> > &, I = <0, 1, 2>, Args = <int &>]
  auto operator()(CArgs&&... cargs) const& -> decltype(invokeForward(
                                                       ^
folly/functional/test/PartialTest.cpp:59:21: note: while substituting deduced template arguments into function template 'operator()' [with CArgs = <int &>]
  EXPECT_EQ(1234, p0(four));
                    ^
type_traits:1743:5: note: '~__nat' has been explicitly marked deleted here
    ~__nat() = delete;
    ^
```

Reviewed By: chadaustin

Differential Revision: D23722804

fbshipit-source-id: 7b3d6307a46fa12eadea13db327f10aafb89691c

Summary:
The getuid and getgid are defined as returning uid_t and gid_t. Defining these
types here will prevent downstream consumer from having to redefine these
types for Windows.

(Note: this ignores all push blocking failures!)

Reviewed By: yfeldblum, Orvid

Differential Revision: D23693492

fbshipit-source-id: 1ec9221509bffdd5f6d241c4bc08d7809cdb6162

Summary: no need to install when not building tests

Reviewed By: wez

Differential Revision: D23714375

fbshipit-source-id: 6f34ab59ed2155df5646ad279d1347e904f393c4

Summary: [Folly] Cache python-import in `getExecutor` so that it happens only once overall rather than once per call.

Reviewed By: nanshu

Differential Revision: D23657508

fbshipit-source-id: 06d3bd53303cac9c10fff74f4e6daaeccdc59471

Summary: required. not installed with CMake ExternalProject anymore

Reviewed By: xttjsn

Differential Revision: D23700095

fbshipit-source-id: 807105a1e3d4bd837a35e39c6dced53744edd8de

Summary:
in getdeps we currently don't build and run the tests
There are a few issues:
  1. we need to also build tests for fizz, wangle, mvfst since proxygen tests include headers only exported if building tests in dependencies
  2. we use `ExternalProject_add` for gtest/gmock. but doesn't seem to be playing nicely with getdeps

Reviewed By: dddmello, mjoras

Differential Revision: D16934955

fbshipit-source-id: fb1c52237f9f0c71da86643409972c94d16e6a71

Summary: properly find the required GMock version (1.8.0) and allow building tests in getdeps

Reviewed By: mjoras

Differential Revision: D16935741

fbshipit-source-id: 46f62511e2feaf553d028e286a862aa5b30393c6

Summary: also always install fizz test headers for mvfst and proxygen tests to consume without needing to build fizz tests

Reviewed By: yfeldblum

Differential Revision: D23676344

fbshipit-source-id: 7ae78c81c2d67bb8da135fcd69d4be119b50a27e

Summary: they were all transitively pulling it from folly

Reviewed By: mjoras

Differential Revision: D23683292

fbshipit-source-id: 2085a580584891b3fd0960c14505c0f675a11bd5

Summary:
This diff introduces a callback, `CertificateIdentityVerifier` that can probe peer end-entity certificates during a TLS handshake in `AsyncSSLSocket`.

The verifier gets called only if regular chain verification (OpenSSL's and a `HandshakeCB`'s) succeeds and can return a `Try` with a `CertificateIdentityVerifierException` to indicate that a failure occurred. `AsyncSSLSocket` will then fail the TLS handshake.

The diff also adds a new `AsyncSSLSocket` constructor with a new `Options` parameter that groups together some optional properties, including the verifier. We can eventually refactor the other constructors to use it too.

Reviewed By: mingtaoy

Differential Revision: D22821714

fbshipit-source-id: b63b141862b5703eb5274fb6ef8aa98934a55df0

Summary:
exception_tracer is currently gated on FOLLY_USE_SYMBOLIZER, and when
I enabled it, I didn't notice the CMake build of Folly on macOS
stopped working.

Fix it by adding correct conditionals, and removing the removed
std::unexpected_handler.

Reviewed By: yfeldblum, lnicco

Differential Revision: D23690777

fbshipit-source-id: 76ada7911ac33de3b1e8b0a73cebf3c2d04a58ef

Summary: As the main purpose of write callback is to signal the buffer is on longer needed and may be released (https://fburl.com/diffusion/ahbbb6oy). Release the buffer then calling the write callback seems more reasonable

Differential Revision: D23411380

fbshipit-source-id: c9b421716368253eafb4ecb8b72f48c8b47c2f9f

Summary:
This API allows for an easier way to configure EventBase without a need to introduce yet another constructor with variable amount of arguments.

In particular, we have an ad-hoc constructor for overriding just the wheel timer interval, but it's not possible to override it in other constructors.

Reviewed By: yfeldblum

Differential Revision: D23511659

fbshipit-source-id: 2f8de3a527ee07dbf2dc19f2e369014793d906c1

Summary:
needed by a few projects [wangle, mvfst, proxygen]

it's already in lfs
https://www.internalfb.com/intern/diffusion/FBS/browse/master/fbcode/tools/lfs/.lfs-pointers?lines=41

Reviewed By: mzlee

Differential Revision: D23676343

fbshipit-source-id: 0fa04d4224f27e756f683924af0c21ea63a90647

Summary:
Fixes across the codebase to allow for r-value qualified getVia.

Change is behaviour neutral - getVia is already destructive internally.

Reviewed By: yfeldblum

Differential Revision: D23605722

fbshipit-source-id: 75dfe6faca1c888eae9b262552372dd557eb6933

Summary: Moving CoReturn and CoThrow helpers for use with GTest. CoReturn() and CoThrow() work similar to Return() and Throw() provided in GTest framework.

Reviewed By: yfeldblum

Differential Revision: D23502840

fbshipit-source-id: 3e5f35135d8291543b91d3615e86398d794a7ba9

Summary:
Enable FOLLY_USE_SYMBOLIZER on macOS and teach SafeStackTracePrinter
to use `backtrace_symbols_fd` on non-ELF platforms.

Reviewed By: luciang

Differential Revision: D23017169

fbshipit-source-id: 1ad6cbf6d9ad11276d95b821095e37a86c8bb862

Summary:
Before: While the Xcode constants are pretty well standardized, discoverability and use within folly is non-trivial.
We have constants for various other attributes about the OS and target platform, so add a sane mapping for Apple targets as well.

Reviewed By: yfeldblum

Differential Revision: D23605949

fbshipit-source-id: cd4212dd30d9ec6a3c48a6d7a787a67fdeb9dd1f

Summary: [Folly] Some static-asserts in `Executor::KeepAlive`: standard-layout, pointer-size, pointer-align.

Reviewed By: LeeHowes

Differential Revision: D23656740

fbshipit-source-id: ff6c5aa3de01a37144fe8ef0961f06d13938654a

Summary: For consistency with get() make getTryVia r-value qualified and move the result out. This has the benefit of removing surprise copies in code that already operated on a temporary future but ended up with an l-value reference to copy from as a result of this operation.

Reviewed By: ispeters

Differential Revision: D23610051

fbshipit-source-id: a11344b9c8680f9498abc307ba1c7c793e3403e1

Summary: [Folly] Cut explicit `main` from test programs in `folly/gen/test/` and prefer the linked-in version.

Reviewed By: simpkins

Differential Revision: D23643891

fbshipit-source-id: 20152ae4feeeccd43038580043d45759c39c075c

Summary: This makes sense on systems without `backtrace` and with LLVM libunwind implementations.

Reviewed By: yfeldblum

Differential Revision: D23625739

fbshipit-source-id: 6ec50c94c73bda227118ffc36d6856bcd8dd0d8b

Summary:
`std::shared_ptr` has an aliasing constructor, but `std::weak_ptr`
has none.  This diff implements a helper function that implements the
functionality.  For libstdc++ it uses ABI-specific hacks to avoid the
need to construct a temporary `std::shared_ptr`.

Reviewed By: yfeldblum

Differential Revision: D23580416

fbshipit-source-id: 71712270519b0e7522d8019a5c356679c7dc5397

Summary:
[Folly] Decay char-array and trivial args to `throw_exception` and `terminate_with`.

The motivation is to ensure smaller call-site code size in the common cases, where the solitary argument is a string literal. Extend to cases where arguments are numbers and the like as well, since that is simple enough and is something that `Function` already does.

Reviewed By: aary

Differential Revision: D23550096

fbshipit-source-id: d3a2066dc28dc4cfac6b65e2b8972613ce55d06c

Summary: [Folly] `byte`, backported from `std::byte` in C++17.

Reviewed By: Alfus, vitaut

Differential Revision: D23535105

fbshipit-source-id: 056c634362b2ca226306a97ae9994a4631d07ee5

Summary: In newer versions of the windows STL, this gets included in <thread>, so explicitly include it in Unistd.h and remove the definition of getpid.

Reviewed By: yfeldblum

Differential Revision: D23498073

fbshipit-source-id: 5fe07dbbaa9fb1bf5c904286bd15beccbf1d1615

Summary:
[Folly] Revise invoke to be an invoker rather than a function, and therefore insusceptible to ADL, and revise invocability traits for compile-time perf.

Do the same for apply and applicability traits.

Reviewed By: Mizuchi

Differential Revision: D23334895

fbshipit-source-id: 4d3241a3f34a7bede44f8ab54a30a3074d9fd3ed

Summary: [Folly] Tweaks to hash primitives: twang, jenkins_rev, fnv

Reviewed By: ot, luciang

Differential Revision: D23290185

fbshipit-source-id: 080dfa8a5f357065473f3973654c91d01c683c3c