- if ((strcmp("-", file_name) == 0)) {
- input = stdin;
- } else {
- if ((input = fopen(file_name, "rb")) == NULL) {
- rrd_set_error("opening '%s': %s", file_name, rrd_strerror(errno));
- return (-1);
- }
- }
- if (skipfirst) {
- do {
- c = getc(input);
- offset++;
- } while (c != '\n' && !feof(input));
- }
- if (strcmp("-", file_name)) {
- fseek(input, 0, SEEK_END);
- /* have extra space for detecting EOF without realloc */
- totalcnt = (ftell(input) + 1) / sizeof(char) - offset;
- if (totalcnt < MEMBLK)
- totalcnt = MEMBLK; /* sanitize */
- fseek(input, offset * sizeof(char), SEEK_SET);
- }
- if (((*buffer) = (char *) malloc((totalcnt + 4) * sizeof(char))) == NULL) {
- perror("Allocate Buffer:");
- exit(1);
- };
- do {
- writecnt +=
- fread((*buffer) + writecnt, 1,
- (totalcnt - writecnt) * sizeof(char), input);
- if (writecnt >= totalcnt) {
- totalcnt += MEMBLK;
- if (((*buffer) =
- rrd_realloc((*buffer),
- (totalcnt + 4) * sizeof(char))) == NULL) {
- perror("Realloc Buffer:");
- exit(1);
- };
- }
- } while (!feof(input));
- (*buffer)[writecnt] = '\0';
- if (strcmp("-", file_name) != 0) {
- fclose(input);
- };
- return writecnt;
+/*
+ * This function is called when creating a new RRD
+ * The storage implementation can use this opportunity to select
+ * a sensible starting row within the file.
+ * The default implementation is random, to ensure that all RRAs
+ * don't change to a new disk block at the same time
+ */
+unsigned long rrd_select_initial_row(
+ rrd_file_t *rrd_file __attribute__((unused)),
+ int rra_idx __attribute__((unused)),
+ rra_def_t *rra
+ )
+{
+ return rrd_random() % rra->row_cnt;