- /* Maybe do read-ahead */
- result = mmap(NULL, *size, PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
- if(result == MAP_FAILED) {
- PERROR("mmap");
+ result = buf->shmid = shmget(getpid(), *size, IPC_CREAT | IPC_EXCL | 0700);
+ if(buf->shmid == -1) {
+ PERROR("shmget");
+ return -1;
+ }
+
+ ptr = shmat(buf->shmid, NULL, 0);
+ if(ptr == (void *) -1) {
+ perror("shmat");
+ goto destroy_shmem;
+ }
+
+ /* Already mark the shared memory for destruction. This will occur only
+ * when all users have detached.
+ */
+ result = shmctl(buf->shmid, IPC_RMID, NULL);
+ if(result == -1) {
+ perror("shmctl");