DiskImages2.m

#import <Foundation/Foundation.h>
#include <dlfcn.h>
#include <objc/message.h>
#include <objc/message.h>

int main(int argc, const char * argv[]) {
    @autoreleasepool {
        {
            void *handle = dlopen("/System/Library/PrivateFrameworks/DiskImages2.framework/DiskImages2", RTLD_NOW);
            assert(handle != NULL);
        }
        
        NSURL *url = [NSURL fileURLWithPath:@"/Volumes/Data 1/SD/Xcode/Xcode_4.6.3.dmg"];
        
        NSError * _Nullable error = nil;
        id _Nullable attachParams = ((id (*)(id, SEL, id, id *))objc_msgSend)([objc_lookUpClass("DIAttachParams") alloc], sel_registerName("initWithURL:error:"), url, &error);
        assert(error == nil);
        
        id handle;
        BOOL result = ((BOOL (*)(Class, SEL, id, id *, id *))objc_msgSend)(objc_lookUpClass("DiskImages2"), sel_registerName("attachWithParams:handle:error:"), attachParams, &handle, &error);
        [attachParams release];
        assert(result);
        result = ((BOOL (*)(id, SEL, id *))objc_msgSend)(handle, sel_registerName("waitForDeviceWithError:"), &error);
        assert(result);
        
        sleep(2);
        
        id arb = ((id (*)(Class, SEL, id *))objc_msgSend)(objc_lookUpClass("DIDiskArb"), sel_registerName("diskArbWithError:"), &error);
        assert(error == nil);
        
        NSString *BSDName = ((id (*)(id, SEL))objc_msgSend)(handle, sel_registerName("BSDName"));
        NSDictionary<NSString *, NSString *> *allMountPoints = ((id (*)(Class, SEL))objc_msgSend)(objc_lookUpClass("DIAttachedDeviceInfo"), sel_registerName("copyAllMountPoints"));
        
        [allMountPoints enumerateKeysAndObjectsUsingBlock:^(NSString * _Nonnull key, NSString * _Nonnull obj, BOOL * _Nonnull stop) {
            if ([key hasPrefix:BSDName]) {
                NSError * _Nullable error = nil;
                BOOL result = ((BOOL (*)(id, SEL, id, id *))objc_msgSend)(arb, sel_registerName("unmountWithMountPoint:error:"), obj, &error);
                assert(result);
            }
        }];
        [allMountPoints release];
    }
    
    return EXIT_SUCCESS;
}