I am trying to convert an ObjC stackoverflow answer to Swift and failing. It looks like I am passing a UnsafeMutablePointer<mach_msg_type_number_t> when I should be passing an inout mach_msg_...

My application uses mach_absolute_time to calculate the ticks since the last touch event and logs the user out if it surpasses an idle time limit of 10 minutes. This all works fine on iOS 6, but I...

I would like to know what's the difference betweenmach_vm_allocate and vm_allocate. I know mach_vm_allocate is only available in OS X and not iOS, but I'm not sure why. The file that has all the fu...

I want to use Mach Exception Ports to handle exceptions for all tasks (processes) running on macOS. My understanding is that host_set_exception_ports is to be used in this case. However, host_set_e...

I have the following file: ; hello.s .section __TEXT,__text .globl _main _main: movl $0x2000001, %eax movl $42, %ebx syscall I try to run it as follows: # run.sh as -mmacosx-version-min=10...

My application receives mach IPC messages and return answers for the callers. I have mach caller port(msgh_remote_port) and I want to know PID of the caller. Can I find on OSX by the mach port a PI...

Why does host_statistics64() in OS X 10.6.8 (I don't know if other versions have this problem) return counts for free, active, inactive, and wired memory that don't add up to the total amount of ra...

I'm working on developing a macOS dylib framework, developed outside of Xcode, and I'm trying to understand the significance of the install_name option. For example, I can set the LC_ID_DYLIB sect...

There appear to be some similar-looking long alphanumeric strings that commonly occur in Mach-O 64 bit executables and ELF 64-bit LSB executables among other symbols that are not alphanumeric: ca...

I am doing a comparison of different IPC mechanisms available on Mac OS X (pipes, sockets, System V IPC, etc.), and I would like to see how Mach ports compare to the higher-level alternatives. Howe...

I'm working on a coreaudio user-space hal plugin based on the example developer.apple.com/library/mac/samplecode/AudioDriverExamples/Introduction/Intro.html In the plug-in implementation, I plan t...

I'd like to figure out how does VMMAP process operates. After running this executable with dtrace, it seems that the method proc_regionfilename that extract the address space of each section in t...

I want to know the Total RAM available in my iPhone. For this I've used the following code. Note: Please do not interpret the question as to retrieve RAM statistics such as Wired, Inactive, Active...

I sometimes get following exception: [Mach] exception: 0x%x, count: %d, code: 0x%llx 0x%llx [Mach] Skipping registered port - it is invalid [Mach] Skipping registered port - mask does not match si...

I have an application which can log a stacktrace, which can be later used for debugging. On Windows, I've gotten by using the excellent JCLDebug unit provided by the JEDI project. Now that my app...

How to get Wi-Fi encryption mode in iOS without private libraries?

I'm intentionally causing an EXC_BAD_ACCESS. By triggering a write to an NSObject in a read-only virtual memory page. Ideally, I'd like to catch EXC_BAD_ACCESS, mark the virtual memory page as read...

I am trying to install a privileged helper tool to perform some elevated work. I am using SMJobBless for the same. I am able to install the tool fine and also able to communicate with it. I am usin...

Knowing both are micro-kernels, what is the difference b/w Mach (on which Hurd is based on) and Minix. Are there any architectural differences? A little light over "what is L4" would be very helpfu...

In KEXT, I am listening for file close via vnode or file scope listener. For certain (very few) files, I need to send file path to my system daemon which does some processing (this has to happen in...

I want to port the xnu kernel to the ARM architecture, with the ultimate goal of being able to run a full kernel inside Qemu. While I do realise that this is a very difficult task, I still want to ...