x/sys/unix: add Statfs for NetBSD

[dundee]

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

go version go1.17.4 linux/amd64

Does this issue reproduce with the latest release?

yes

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

go env Output

GO111MODULE=""
GOARCH="amd64"
GOBIN=""
GOCACHE="/home/dundee/.cache/go-build"
GOENV="/home/dundee/.config/go/env"
GOEXE=""
GOEXPERIMENT=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOINSECURE=""
GOMODCACHE="/home/dundee/go/pkg/mod"
GONOPROXY=""
GONOSUMDB=""
GOOS="linux"
GOPATH="/home/dundee/go"
GOPRIVATE=""
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/usr/lib/go"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/usr/lib/go/pkg/tool/linux_amd64"
GOVCS=""
GOVERSION="go1.17.4"
GCCGO="gccgo"
AR="ar"
CC="gcc"
CXX="g++"
CGO_ENABLED="1"
GOMOD="/home/dundee/work/gdu/go.mod"
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build3967749979=/tmp/go-build -gno-record-gcc-switches"

What did you do?

I am trying to call Statfs syscall on NetBSD.

package main

import (
	"syscall"
)

func main() {
	info := &syscall.Statfs_t{}
	err := syscall.Statfs("/", info)
	if err != nil {
		panic(err)
	}
}

GOOS=netbsd go build main.go

What did you expect to see?

Program compiles ok with GOOS=netbsd

What did you see instead?

# command-line-arguments
./main.go:9:9: undefined: syscall.Statfs

I would like to work on the implementation myself.

[seankhliao]

Note syscall is frozen/deprecated, this would go in golang.org/x/sys/unix

Feel free to send a PR/CL

[dundee]

Statfs is deprecated in NetBSD. There is statvfs which looks to be implemented fine in golang.org/x/sys/unix. Closing.