Function CreateSharedMemory

LibLemon/src/lemon/sharedmem.cpp:7–14

namespace Lemon {
    int64_t CreateSharedMemory(uint64_t size, uint64_t flags){
        int64_t key;
        long ret = syscall(SYS_CREATE_SHARED_MEMORY, &key, size, flags, /*recipient*/0);
        if(ret < 0){
            return ret;
        }
        return key;
    }

    volatile void* MapSharedMemory(int64_t key){
        volatile void* ptr;