diff options
Diffstat (limited to 'sysdeps/unix/bsd/poll.c')
| -rw-r--r-- | sysdeps/unix/bsd/poll.c | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/sysdeps/unix/bsd/poll.c b/sysdeps/unix/bsd/poll.c index 23ae6e21be..7fb4fcc3fa 100644 --- a/sysdeps/unix/bsd/poll.c +++ b/sysdeps/unix/bsd/poll.c @@ -62,6 +62,32 @@ __poll (fds, nfds, timeout) for (f = fds; f < &fds[nfds]; ++f) if (f->fd >= 0) { + if (f->fd >= max_fd_size) + { + /* The user provides a file descriptor number which is higher + than the maximum we got from the `getdtablesize' call. + Maybe this is ok so enlarge the arrays. */ + fd_set *nrset, *nwset, *nxset; + int nbytes; + + max_fd_size = roundup (f->fd, __NFDBITS); + nbytes = howmany (max_fd_size, __NFDBITS); + + nrset = alloca (nbytes); + nwset = alloca (nbytes); + nxset = alloca (nbytes); + + __bzero ((char *) nrset + bytes, nbytes - bytes); + __bzero ((char *) nwset + bytes, nbytes - bytes); + __bzero ((char *) nxset + bytes, nbytes - bytes); + + rset = memcpy (nrset, rset, bytes); + wset = memcpy (nwset, wset, bytes); + xset = memcpy (nxset, xset, bytes); + + bytes = nbytes; + } + if (f->events & POLLIN) FD_SET (f->fd, rset); if (f->events & POLLOUT) |