os/linux/io_uring: add recvmsg and sendmsg

[hnakamur]

Add recvmsg and sendmsg method from liburing.

[hnakamur]

CI failed with error: 'iovec_const' is private on linux arm64.
https://cloud.drone.io/ziglang/zig/13564/1/4

./build/zig build -Dskip-non-native test-std -Dskip-release-safe -Dskip-release-fast -Dskip-release-small
./lib/std/os/linux/arm64.zig:7:26: error: 'iovec_const' is private
  const iovec_const = linux.iovec_const;

I found iovec_const on x86_64 was changed from linux.iovec_const to std.os.iovec_const at c09ba8796c#diff-b809c5506c57c268cbed4b5e44b91d0959e4361a61ec8d03a09a3d16da8cf277
Should we change iovec_const on arm64 to std.os.iovec_const too?

[kprotty]

Yes. We should also do the same for the other os/linux/*.zig targets like ppc(64), sparc64, i386, mips, etc.

[andrewrk]

Related: #10247.

[hnakamur]

I rebased this pull request since Fix test for io_uring link_timeout (fixes #10247) by hnakamur · Pull Request #10257 · ziglang/zig is merged.

I confirmed io_uring tests pass on both Linux kernel 5.11 and 5.4.

$ zig version
0.9.0-dev.1815+20e19e75f
$ uname -r
5.11.0-40-generic
$ zig test lib/std/os/linux/io_uring.zig --zig-lib-dir lib --main-pkg-path lib/std
All 18 tests passed.

root@bionic-vm:~/zig# zig version
0.9.0-dev.1815+20e19e75f
root@bionic-vm:~/zig# uname -r
5.4.0-91-generic
root@bionic-vm:~/zig# zig test lib/std/os/linux/io_uring.zig --zig-lib-dir lib --main-pkg-path lib/std
Test [6/18] test "write/read"... SKIP
Test [8/18] test "openat"... SKIP
Test [9/18] test "close"... SKIP
Test [10/18] test "accept/connect/send/recv"... SKIP
Test [14/18] test "timeout_remove"... SKIP
Test [15/18] test "accept/connect/recv/link_timeout"... SKIP
Test [16/18] test "fallocate"... SKIP
Test [17/18] test "statx"... SKIP
Test [18/18] test "accept/connect/recv/cancel"... SKIP
Test [19/18] test "register_files_update"... SKIP
8 passed; 10 skipped; 0 failed.
root@bionic-vm:~/zig# zig test lib/std/os/linux/io_uring.zig --zig-lib-dir lib --main-pkg-path lib/std \
  --test-filter "sendmsg/recvmsg"
All 1 tests passed.

[kprotty]

Hey, could this be rebased on master branch? I can give the OK if it passes CI once updated.

[hnakamur]

@kprotty Hi, I rebased this two days ago, but builds.hut.lavatech.top: freebsd.yml is still pending. Is there something I can do?

[Luukdegram]

@kprotty Hi, I rebased this two days ago, but builds.hut.lavatech.top: freebsd.yml is still pending. Is there something I can do?

If you rebase and force push, the CI should trigger once again.

[hnakamur]

@Luukdegram Thanks, I'm glad it finally passes CI.
@kprotty Hi, could you review this?

[kprotty]

Sorry, I happened to miss the ping.