Merge pull request #3 from moul/dev/moul/darwin

feat: add darwin support

README.md

@@ -8,7 +8,7 @@
 [![Docker Metrics](https://images.microbadger.com/badges/image/moul/openfiles.svg)](https://microbadger.com/images/moul/openfiles)
 [![Made by Manfred Touron](https://img.shields.io/badge/made%20by-Manfred%20Touron-blue.svg?style=flat)](https://manfred.life/)
 
-[![CI](https://github.com/moul/openfiles/workflows/CI/badge.svg)](https://github.com/moul/openfiles/actions?query=workflow%3ACI)
+[![Go](https://github.com/moul/openfiles/workflows/Go/badge.svg)](https://github.com/moul/openfiles/actions?query=workflow%3AGo)
 [![Release](https://github.com/moul/openfiles/workflows/Release/badge.svg)](https://github.com/moul/openfiles/actions?query=workflow%3ARelease)
 [![GolangCI](https://golangci.com/badges/github.com/moul/openfiles.svg)](https://golangci.com/r/github.com/moul/openfiles)
 [![codecov](https://codecov.io/gh/moul/openfiles/branch/master/graph/badge.svg)](https://codecov.io/gh/moul/openfiles)

openfiles_darwin.go

@@ -0,0 +1,19 @@
+// +build darwin
+
+package openfiles
+
+import (
+	"fmt"
+	"os"
+	"os/exec"
+	"strings"
+)
+
+func Count() (int64, error) {
+	out, err := exec.Command("/bin/sh", "-c", fmt.Sprintf("lsof -p %v", os.Getpid())).Output()
+	if err != nil {
+		return -1, err
+	}
+	lines := strings.Split(string(out), "\n")
+	return int64(len(lines) - 1), nil
+}

openfiles_linux.go

@@ -8,11 +8,11 @@ import (
 	"path/filepath"
 )
 
-func Count() (int, error) {
+func Count() (int64, error) {
 	pid := os.Getpid()
 	m, err := filepath.Glob(fmt.Sprintf("/proc/%d/fd/*", pid))
 	if err != nil {
 		return -1, err
 	}
-	return len(m), nil
+	return int64(len(m)), nil
 }

openfiles_unsupported.go

@@ -1,7 +1,7 @@
-// +build !linux
+// +build !linux,!darwin
 
 package openfiles
 
-func Count() (int, error) {
+func Count() (int64, error) {
 	return -1, ErrNotSupported
 }