+static bool write_buildid_table(int fd)
+{
+ struct dso *pos;
+ bool have_buildid = false;
+
+ list_for_each_entry(pos, &dsos, node) {
+ struct build_id_event b;
+ size_t len;
+
+ if (filename__read_build_id(pos->long_name,
+ &b.build_id,
+ sizeof(b.build_id)) < 0)
+ continue;
+ have_buildid = true;
+ memset(&b.header, 0, sizeof(b.header));
+ len = strlen(pos->long_name) + 1;
+ len = ALIGN(len, 64);
+ b.header.size = sizeof(b) + len;
+ do_write(fd, &b, sizeof(b));
+ do_write(fd, pos->long_name, len);
+ }
+
+ return have_buildid;
+}
+
+static void
+perf_header__adds_write(struct perf_header *self, int fd, bool at_exit)