Get the USB Serial Number from C in Go with IOKit

main.go

package main

// #cgo LDFLAGS: -framework CoreFoundation -framework IOKit
// #include <CoreFoundation/CoreFoundation.h>
// #include <IOKit/IOKitLib.h>
// #include <IOKit/serial/IOSerialKeys.h>
// #include <IOKit/usb/IOUSBLib.h>
//
// const char *
// getSerialNumber()
// {
//     CFMutableDictionaryRef matching = IOServiceMatching("IOPlatformExpertDevice");
//     io_service_t service = IOServiceGetMatchingService(kIOMasterPortDefault, matching);
//     CFStringRef serialNumber = IORegistryEntryCreateCFProperty(service,
//         CFSTR("IOPlatformSerialNumber"), kCFAllocatorDefault, 0);
//     const char *str = CFStringGetCStringPtr(serialNumber, kCFStringEncodingUTF8);
//     IOObjectRelease(service);
//
//     return str;
// }
//
// static void printKeys (const void* key, const void* value, void* context) {
//   CFShow(key);
// }
//
// void myIoKit() {
//   printf("hi\n");
//   CFMutableDictionaryRef keywordDict = IOServiceMatching(kIOSerialBSDServiceValue);
//   io_object_t port = 0;
//   io_iterator_t iterator = 0;
//   kern_return_t result = IOServiceGetMatchingServices(kIOMasterPortDefault, keywordDict, &iterator);
//   if (result) {
//   		exit(EXIT_FAILURE);
//   }
//
//   while ((port = IOIteratorNext(iterator))) {
//     CFMutableDictionaryRef dict = NULL;
//     result = IORegistryEntryCreateCFProperties(port, &dict, kCFAllocatorDefault, 0);
//
//     io_object_t parent = 0;
//     io_object_t parents = port;
//     while (KERN_SUCCESS == IORegistryEntryGetParentEntry(parents, kIOServicePlane, &parent)) {
//     result = IORegistryEntryCreateCFProperties(parent, &dict, kCFAllocatorDefault, 0);
//
//     if (parents != port)
//     IOObjectRelease(parents);
//     parents = parent;
//     }
//
//     printf("0x%08lx", (uintptr_t)port);
//     CFShow(dict);
// /*
//     CFDictionaryApplyFunction(dict, printKeys, NULL);
//     CFStringRef tmpString = CFDictionaryGetValue(dict, CFSTR("IOBluetoothActive"));
//     NSLog(@"
// */
//     printf("\n\n");
//   }
// }
import "C"

import (
	"fmt"
)

func main() {
	C.myIoKit()
	serialNumber := C.GoString(C.getSerialNumber())
	fmt.Println(serialNumber)
}