* Perform the initial filedescriptor scan and register ourselves with * each selinfo. */
| 1360 | * each selinfo. |
| 1361 | */ |
| 1362 | static int |
| 1363 | selscan(struct thread *td, fd_mask **ibits, fd_mask **obits, int nfd) |
| 1364 | { |
| 1365 | struct filedesc *fdp; |
| 1366 | struct file *fp; |
| 1367 | fd_mask bit; |
| 1368 | int ev, flags, end, fd; |
| 1369 | int n, idx; |
| 1370 | int error; |
| 1371 | bool only_user; |
| 1372 | |
| 1373 | fdp = td->td_proc->p_fd; |
| 1374 | n = 0; |
| 1375 | only_user = FILEDESC_IS_ONLY_USER(fdp); |
| 1376 | for (idx = 0, fd = 0; fd < nfd; idx++) { |
| 1377 | end = imin(fd + NFDBITS, nfd); |
| 1378 | for (bit = 1; fd < end; bit <<= 1, fd++) { |
| 1379 | /* Compute the list of events we're interested in. */ |
| 1380 | flags = selflags(ibits, idx, bit); |
| 1381 | if (flags == 0) |
| 1382 | continue; |
| 1383 | if (only_user) |
| 1384 | error = fget_only_user(fdp, fd, &cap_event_rights, &fp); |
| 1385 | else |
| 1386 | error = fget_unlocked(fdp, fd, &cap_event_rights, &fp); |
| 1387 | if (__predict_false(error != 0)) |
| 1388 | return (error); |
| 1389 | selfdalloc(td, (void *)(uintptr_t)fd); |
| 1390 | ev = fo_poll(fp, flags, td->td_ucred, td); |
| 1391 | if (only_user) |
| 1392 | fput_only_user(fdp, fp); |
| 1393 | else |
| 1394 | fdrop(fp, td); |
| 1395 | if (ev != 0) |
| 1396 | n += selsetbits(ibits, obits, idx, bit, ev); |
| 1397 | } |
| 1398 | } |
| 1399 | |
| 1400 | td->td_retval[0] = n; |
| 1401 | return (0); |
| 1402 | } |
| 1403 | |
| 1404 | int |
| 1405 | sys_poll(struct thread *td, struct poll_args *uap) |
no test coverage detected