Re: [libmicrohttpd] MHD_get_fdset throws "Illegal instruction" error

[Vitaliy T]

On 14 March 2017 at 23:21, Evgeny Grin <k...@yandex.ru> wrote:
> MHD_get_fdset() may return MHD_NO if epoll FD is too high to fit fd_set
> or if MHD_get_fdset() erroneously called for daemon with
> MHD_USE_THREAD_PER_CONNECTION option.

Sorry, you are wrong.

src/microhttpd/daemon.c

      660 int
      661 MHD_get_fdset (struct MHD_Daemon *daemon,
...
      666 {
      667   return MHD_get_fdset2 (daemon,
...
      673 }

      913 int
      914 MHD_get_fdset2 (struct MHD_Daemon *daemon,
...
      920 {
      921   struct MHD_Connection *pos;
      922   struct MHD_Connection *posn;
      923   int result = MHD_YES;
      924   MHD_socket ls;
      925
      926   if ( (NULL == daemon) ||
      927        (NULL == read_fd_set) ||
      928        (NULL == write_fd_set) ||
      929        (daemon->shutdown) ||
      930        (0 != (daemon->options & MHD_USE_THREAD_PER_CONNECTION)) ||
      931        (0 != (daemon->options & MHD_USE_POLL)))
      932     return MHD_NO;
...

src/iinclude/microhttpd.h
      882 enum MHD_FLAG
      883 {
...
     1038   MHD_USE_EPOLL_INTERNALLY_LINUX_ONLY = MHD_USE_EPOLL |
MHD_USE_INTERNAL_POLLING_THREAD,


As you can see there is check against MHD_USE_POLL and if the flag is
set then MHD_get_fdset() is always return MND_NO.

-- 
With Best Regards,
Vitaliy V. Tokarev