syscall: arm64: epoll_wait syscall not implemented

[nplanel]

Please answer these questions before submitting your issue. Thanks!

Seems I found a syscall not implemented in latest golang (and earlier), I assume this is not the only one.
I didn't found any related GH issue to arm64 syscall not implemented or missing, so I created this ticket.

What version of Go are you using (go version)?

1.10.3

Does this issue reproduce with the latest release?

yes

What operating system and processor architecture are you using (go env)?

Linux apm-mustang 4.16.14-300.fc28.aarch64 #1 SMP Tue Jun 5 16:00:29 UTC 2018 aarch64 aarch64 aarch64 GNU/Linux

GOARCH="arm64"
GOBIN=""
GOCACHE="/home/user/.cache/go-build"
GOEXE=""
GOHOSTARCH="arm64"
GOHOSTOS="linux"
GOOS="linux"
GOPATH="/home/user/go"
GORACE=""
GOROOT="/home/user/.gimme/versions/go1.10.3.linux.arm64"
GOTMPDIR=""
GOTOOLDIR="/home/user/.gimme/versions/go1.10.3.linux.arm64/pkg/tool/linux_arm64"
GCCGO="gccgo"
CC="gcc"
CXX="g++"
CGO_ENABLED="1"
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build763200214=/tmp/go-build -gno-record-gcc-switches"

What did you do?

If possible, provide a recipe for reproducing the error.
A complete runnable program is good.
A link on play.golang.org is best.

package main

import (
"fmt"
"syscall"
)

func main() {
maxEpollEvents := 10
events := make([]syscall.EpollEvent, maxEpollEvents)

epollFd, err := syscall.EpollCreate1(0)
if err != nil {
	fmt.Printf("Failed to create epoll: %s", err)
}

_, err = syscall.EpollWait(epollFd, events[:], 200)
if err != nil {
	fmt.Printf("Failed to  epoll wait: %s", err)
}

}

What did you expect to see?

no output

What did you see instead?

Failed to epoll wait: function not implemented

[nplanel]

syscall epoll_pwait and epoll_wait are supported / tested : fc28 ; glibc 2.27 ; kernel 4.16.14-300.fc28.aarch64

[ianlancetaylor]

Use gopath.org/x/sys/unix instead of syscall.

Leaving this open because I suppose we should fix the syscall package too. But even then you should use gopath.org/x/sys/unix instead.

[nplanel]

I tested golang master and it's working fine, could you backport the fix ?

[tklauser]

In case we want to backport the fix in syscall, this was https://golang.org/cl/115735 (which will be part of the upcoming Go 1.11 release).

[bradfitz]

If this is coming in Go 1.11, that's sufficient to close this bug.

This doesn't warrant backporting since there's an obvious workaround: use golang.org/x/sys/unix, which is recommended anyway. The syscall package should not be used.