+ /* First try sendfile(), unless we already tried */
+ if (try_sendfile) {
+
+ n = sendfile(fdt, fdf, NULL, m);
+ if (n < 0) {
+ if (errno != EINVAL && errno != ENOSYS)
+ return -errno;
+
+ try_sendfile = false;
+ /* use fallback below */
+ } else if (n == 0) /* EOF */
+ break;
+ else if (n > 0)
+ /* Succcess! */
+ goto next;
+ }
+
+ /* As a fallback just copy bits by hand */
+ {
+ char buf[m];
+ ssize_t k;