- MYFREAD(rrd->pdp_prep, pdp_prep_t, rrd->stat_head->ds_cnt)
- MYFREAD(rrd->cdp_prep, cdp_prep_t, (rrd->stat_head->rra_cnt
- * rrd->stat_head->ds_cnt))
- MYFREAD(rrd->rra_ptr, rra_ptr_t, rrd->stat_head->rra_cnt)
-#undef MYFREAD
+#endif /* DEBUG */
+
+#ifdef USE_MADVISE
+# ifdef ONE_PAGE
+ /* Keep headers around, round up to next page boundary. */
+ ret =
+ PAGE_ALIGN(rrd_file->header_len % _page_size + rrd_file->header_len);
+ if (rrd_file->file_len > ret)
+ _madvise(rrd_file->file_start + ret,
+ rrd_file->file_len - ret, MADV_DONTNEED);
+# else
+ /* ignoring errors from RRDs that are smaller then the file_len+rounding */
+ _madvise(rrd_file->file_start + PAGE_ALIGN_DOWN(rrd_file->header_len),
+ rrd_file->file_len - PAGE_ALIGN(rrd_file->header_len),
+ MADV_DONTNEED);
+# endif
+#endif
+#ifdef HAVE_MMAP
+ ret = munmap(rrd_file->file_start, rrd_file->file_len);
+ if (ret != 0)
+ rrd_set_error("munmap rrd_file: %s", rrd_strerror(errno));
+#endif
+ ret = close(rrd_file->fd);
+ if (ret != 0)
+ rrd_set_error("closing file: %s", rrd_strerror(errno));
+ free(rrd_file);
+ rrd_file = NULL;
+ return ret;
+}
+
+
+/* Set position of rrd_file. */
+
+off_t rrd_seek(
+ rrd_file_t *rrd_file,
+ off_t off,
+ int whence)
+{
+ off_t ret = 0;
+
+#ifdef HAVE_MMAP
+ if (whence == SEEK_SET)
+ rrd_file->pos = off;
+ else if (whence == SEEK_CUR)
+ rrd_file->pos += off;
+ else if (whence == SEEK_END)
+ rrd_file->pos = rrd_file->file_len + off;
+#else
+ ret = lseek(rrd_file->fd, off, whence);
+ if (ret < 0)
+ rrd_set_error("lseek: %s", rrd_strerror(errno));
+ rrd_file->pos = ret;
+#endif
+//XXX: mimic fseek, which returns 0 upon success
+ return ret == -1; //XXX: or just ret to mimic lseek
+}
+
+
+/* Get current position in rrd_file. */
+
+inline off_t rrd_tell(
+ rrd_file_t *rrd_file)
+{
+ return rrd_file->pos;
+}
+
+
+/* read count bytes into buffer buf, starting at rrd_file->pos.
+ * Returns the number of bytes read. */
+
+inline ssize_t rrd_read(
+ rrd_file_t *rrd_file,
+ void *buf,
+ size_t count)
+{
+#ifdef HAVE_MMAP
+ buf = memcpy(buf, rrd_file->file_start + rrd_file->pos, count);
+ rrd_file->pos += count; /* mimmic read() semantics */
+ return count;
+#else
+ ssize_t ret;
+
+ ret = read(rrd_file->fd, buf, count);
+ //XXX: eventually add generic rrd_set_error(""); here
+ rrd_file->pos += count; /* mimmic read() semantics */
+ return ret;
+#endif
+}
+
+
+/* write count bytes from buffer buf to the current position
+ * rrd_file->pos of rrd_file->fd.
+ * Returns the number of bytes written. */