Add network interface flag constants for all platforms.

Expose MFD_ constants on all Linux targets.

These aren't exposed on non-MIPS musl targets, but since they're
part of a kernel API, they're still applicable, so we just don't
test them there but expose them anyways.

These aren't exposed on non-MIPS musl targets, but since they're
part of a kernel API, they're still applicable, so we just don't
test them there but expose them anyways.

Add SHM_ANON for FreeBSD

This is a constant for `shm_open` that is used instead of the address to create an anonymous shared memory mapping.

https://github.com/freebsd/freebsd/blob/a9656e45a9d1cc0fc5343dd941106e0b823ff770/sys/sys/mman.h#L168

Add constants for memfd_create syscall

Fix rustdoc warning

Add constants used by getrandom linux syscall

getrandom syscall was added in kernel 3.17. Musl and android seems to use old kernel headers, but considering that they define SYS_getrandom, the constants GRND_NONBLOCK and GRND_RANDOM should also be defined.

Compile an empty library on wasm32 non-Emscripten

In preparation for eventually having a non-Emscripten based wasm32 target, this
commit makes `libc` the crate an empty library on wasm32 targets that are not
with `target_os = "emscripten"`. This may eventually get filled out over time,
but for now it's all empty!

In preparation for eventually having a non-Emscripten based wasm32 target, this
commit makes `libc` the crate an empty library on wasm32 targets that are not
with `target_os = "emscripten"`. This may eventually get filled out over time,
but for now it's all empty!

Fix sparc64-unknown-linux-gnu tests

Run sparc64 test in qemu system like s390x. Fix O_TMPFILE const.

Fixes https://github.com/rust-lang/libc/issues/822

Run s390x tests on qemu system

qemu in user mode cannot run binaries produced by rustc (it hangs), so we run the tests in a fully virtualized s390x machine using qemu-system-s390x.

Some constants had to be fixed.

Add WCONTINUED const for OpenBSD

Simple addition of `WCONTINUED` for OpenBSD-like systems. Built nix against this modified libc and used it to test.

Bump to 0.2.33

Just bumping the release to make getprotobyname, getprotobynumber and getservbyname available.

Fixes and test for x86_64-unknown-linux-gnux32

This fixes all libc tests and almost all rustc tests (3 libstd tests and one run-pass test fails).

Fixes https://github.com/rust-lang/libc/issues/816https://github.com/rust-lang/libc/issues/816

Add sparc64-unknown-linux-gnu to CI (with disabled tests)

Tests are disabled because qemu segfaults, see https://github.com/rust-lang/libc/issues/822

The builder is still useful to catch some errors.

Add mips64el to CI

Add powerpc64le to CI

Fix android ci

Fix kqueue filter consts type on NetBSD [WAS: Provide EV_SET]

Using BSD kqueue's `kevent` structure is tedious, because some BSD variants define the structure slightly differently. This forces user's code to differentiate between BSD variants and initialize `kevent` accordingly, which is annoying and error-prone.

For an example, refer to [MIO](https://github.com/carllerche/mio/blob/master/src/sys/unix/kqueue.rs#L38).

This is an attempt to fix it - provide a ctor function with the same signature across BSD variants.

Is an `impl` piece for a C structure allowed in libc?

**edit:** I noticed the `kevent` function has a similar problem, maybe I should include a fix for that too...
**edit:** ^ Done