-#if (CAA_BITS_PER_LONG == 32)
-/* Define the maximum shared memory size to 128MB on 32-bit machines */
-#define MAX_SHM_SIZE 134217728
-#else
-/* Define the maximum shared memory size to 8GB on 64-bit machines */
-#define MAX_SHM_SIZE 8589934592
-#endif
-
-#define DECLARE_SHMP(type, name) type *****name
-
-struct shm_header {
- uint32_t magic;
- uint8_t major;
- uint8_t minor;
- uint8_t bits_per_long;
- size_t shm_size, shm_allocated;
-
- DECLARE_SHMP(struct channel, chan);
-};
-
-struct shm_handle {
- struct shm_header *header; /* beginning of mapping */
- int shmfd; /* process-local file descriptor */
-};
-
-#define shmp(shm_offset) \
- ((__typeof__(****(shm_offset))) (((char *) &(shm_offset)) + (ptrdiff_t) (shm_offset)))
-
-#define _shmp_abs(a) ((a < 0) ? -(a) : (a))
-
-static inline
-void _set_shmp(ptrdiff_t *shm_offset, void *ptr)
-{
- *shm_offset = (((char *) ptr) - ((char *) shm_offset));
- assert(_shmp_abs(*shm_offset) < MAX_SHM_SIZE);
-}
-
-#define set_shmp(shm_offset, ptr) \
- _set_shmp((ptrdiff_t *) ****(shm_offset), ptr)
-
-/* Shared memory is already zeroed by shmget */
-/* *NOT* multithread-safe (should be protected by mutex) */