Function SysUnmapSharedMemory

Kernel/src/arch/x86_64/syscalls.cpp:1109–1126

* SysUnmapSharedMemory (address, key) - Map Shared Memory * address - address of mapped memory * key - Memory key * * On Success - return 0 * On Failure - return -1 */

 * On Failure - return -1
 */
long SysUnmapSharedMemory(regs64_t* r){
	uint64_t address = SC_ARG0(r);
	int64_t key = SC_ARG1(r);

	shared_mem_t* sMem = Memory::GetSharedMemory(key);
	if(!sMem) return -1;

	if(!Memory::CheckRegion(address, sMem->pgCount * PAGE_SIZE_4K, Scheduler::GetCurrentProcess()->addressSpace)) // Make sure the process is not screwing with kernel memory
		return -1;

	Memory::Free4KPages((void*)address, sMem->pgCount, Scheduler::GetCurrentProcess()->addressSpace);

	sMem->mapCount--;

	Memory::DestroySharedMemory(key); // Active shared memory will not be destroyed and this will return

	return 0;
}

/* 
 * SysDestroySharedMemory (key) - Destroy Shared Memory