console_user.go

package main

/*
#cgo LDFLAGS: -framework SystemConfiguration
#include <SystemConfiguration/SystemConfiguration.h>
#include <stdlib.h>
*/
import "C"
import (
	"errors"
	"fmt"
	"log"
	"os/user"
)

func main() {
	u, err := currentMacOSUser()
	if err != nil {
		log.Fatal(err)
	}
	fmt.Println(u.Username)
}

// currentMacOSUser calls SCDynamicStoreCopyConsoleUser
// to get the current macOS logged in user.
func currentMacOSUser() (*user.User, error) {
	uid := new(C.uid_t)
	C.SCDynamicStoreCopyConsoleUser(nil, uid, nil)
	if uid == nil {
		return nil, errors.New("failed to lookup macOS console user")
	}
	return user.LookupId(fmt.Sprintf("%d", *uid))
}