1 /* poller - front-end for waiting for I/O functions
    2    Copyright (C) 2010  Marek Behun
    3 
    4    This program is free software: you can redistribute it and/or modify
    5    it under the terms of the GNU Lesser General Public License as published by
    6    the Free Software Foundation, either version 3 of the License, or
    7    (at your option) any later version.
    8 
    9    This program is distributed in the hope that it will be useful,
   10    but WITHOUT ANY WARRANTY; without even the implied warranty of
   11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   12    GNU Lesser General Public License for more details.
   13 
   14    You should have received a copy of the GNU Lesser General Public License
   15    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
   16 
   17 #include <stdint.h>
   18 
   19 #ifdef HAVE_EPOLL_WAIT
   20 
   21 # include <sys/epoll.h>
   22 # define POLLERIN EPOLLIN
   23 # define POLLERPRI EPOLLPRI
   24 # define POLLEROUT EPOLLOUT
   25 # define POLLERHUP EPOLLHUP
   26 # define POLLERERR EPOLLERR
   27 
   28 typedef epoll_data_t pollerdata_t;
   29 typedef uint32_t pollerev_t;
   30 
   31 #else /* not HAVE_EPOLL_WAIT */
   32 
   33 # include <poll.h>
   34 # define POLLERIN POLLIN
   35 # define POLLERPRI POLLPRI
   36 # define POLLEROUT POLLOUT
   37 # define POLLERHUP POLLHUP
   38 # define POLLERERR POLLERR
   39 
   40 union _pollerdata_union;
   41 typedef union _pollerdata_union pollerdata_t;
   42 
   43 union _pollerdata_union
   44 {
   45   void * ptr;
   46   int fd;
   47   uint32_t u32;
   48   uint64_t u64;
   49 };
   50 
   51 typedef short pollerev_t;
   52 
   53 #endif /* not HAVE_EPOLL_WAIT */
   54 
   55 typedef void (*pollercb_t) (pollerdata_t data, pollerev_t events);
   56 
   57 int poller_create ();
   58 int poller_destroy (int inst);
   59 int poller_add (int inst, int fd, pollerev_t events, pollerdata_t data);
   60 int poller_modify (int inst, int fd, pollerev_t events, pollerdata_t data);
   61 int poller_remove (int inst, int fd);
   62 int poller_poll (int inst, int timeout, pollercb_t callback);