#include "ust/core.h"
#include "shm_types.h"
-#define SHM_MAGIC 0x54335433
-#define SHM_MAJOR 0
-#define SHM_MINOR 1
-
/*
* Pointer dereferencing. We don't trust the shm_ref, so we validate
* both the index and offset with known boundaries.
*/
static inline
-char *_shmp(struct shm_object_table *table, struct shm_ref *ref)
+char *_shmp_offset(struct shm_object_table *table, struct shm_ref *ref,
+ size_t idx, size_t elem_size)
{
struct shm_object *obj;
- size_t index, offset;
+ size_t objindex, ref_offset;
- index = (size_t) ref->index;
- if (unlikely(index >= table->allocated_len))
+ objindex = (size_t) ref->index;
+ if (unlikely(objindex >= table->allocated_len))
return NULL;
- obj = &table->objects[index];
- offset = (size_t) ref->offset;
- if (unlikely(offset >= obj->memory_map_size))
+ obj = &table->objects[objindex];
+ ref_offset = (size_t) ref->offset;
+ ref_offset += idx * elem_size;
+ /* Check if part of the element returned would exceed the limits. */
+ if (unlikely(ref_offset + elem_size > obj->memory_map_size))
return NULL;
- return &obj->memory_map[offset];
+ return &obj->memory_map[ref_offset];
}
-#define shmp(handle, ref) \
+#define shmp_index(handle, ref, index) \
({ \
__typeof__((ref)._type) ____ptr_ret; \
- ____ptr_ret = (__typeof__(____ptr_ret)) _shmp((handle)->table, &(ref)._ref); \
+ ____ptr_ret = (__typeof__(____ptr_ret)) _shmp_offset((handle)->table, &(ref)._ref, index, sizeof(*____ptr_ret)); \
____ptr_ret; \
})
+#define shmp(handle, ref) shmp_index(handle, ref, 0)
+
static inline
void _set_shmp(struct shm_ref *ref, struct shm_ref src)
{
struct shm_ref zalloc_shm(struct shm_object *obj, size_t len);
void align_shm(struct shm_object *obj, size_t align);
+static inline
+int shm_get_wakeup_fd(struct shm_handle *handle, struct shm_ref *ref)
+{
+ struct shm_object_table *table = handle->table;
+ struct shm_object *obj;
+ size_t index;
+
+ index = (size_t) ref->index;
+ if (unlikely(index >= table->allocated_len))
+ return -EPERM;
+ obj = &table->objects[index];
+ return obj->wait_fd[1];
+
+}
+
+static inline
+int shm_get_wait_fd(struct shm_handle *handle, struct shm_ref *ref)
+{
+ struct shm_object_table *table = handle->table;
+ struct shm_object *obj;
+ size_t index;
+
+ index = (size_t) ref->index;
+ if (unlikely(index >= table->allocated_len))
+ return -EPERM;
+ obj = &table->objects[index];
+ return obj->wait_fd[0];
+}
+
#endif /* _LIBRINGBUFFER_SHM_H */