ooops, I forgot to merge thsi part :(

llvm_mode/afl-llvm-rt.o.c

@@ -129,6 +129,48 @@ static void __afl_map_shm(void) {
     __afl_area_ptr[0] = 1;
 
   }
+  
+  id_str = getenv(CMPLOG_SHM_ENV_VAR);
+
+  if (id_str) {
+
+#ifdef USEMMAP
+    const char*    shm_file_path = id_str;
+    int            shm_fd = -1;
+    unsigned char* shm_base = NULL;
+
+    /* create the shared memory segment as if it was a file */
+    shm_fd = shm_open(shm_file_path, O_RDWR, 0600);
+    if (shm_fd == -1) {
+
+      printf("shm_open() failed\n");
+      exit(1);
+
+    }
+
+    /* map the shared memory segment to the address space of the process */
+    shm_base = mmap(0, sizeof(struct cmp_map), PROT_READ | PROT_WRITE,
+                    MAP_SHARED, shm_fd, 0);
+    if (shm_base == MAP_FAILED) {
+
+      close(shm_fd);
+      shm_fd = -1;
+
+      printf("mmap() failed\n");
+      exit(2);
+
+    }
+
+    __afl_cmp_map = shm_base;
+#else
+    u32 shm_id = atoi(id_str);
+
+    __afl_cmp_map = shmat(shm_id, NULL, 0);
+#endif
+
+    if (__afl_cmp_map == (void*)-1) _exit(1);
+
+  }
 
 }