libs/port/poll.c

   1 /*
   2  * poll function
   3  *
   4  * Copyright 2008 Alexandre Julliard
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  */
  20
  21 #include "config.h"
  22 #include "wine/port.h"
  23
  24 #ifndef HAVE_POLL
  25
  26 #ifdef HAVE_WINSOCK2_H
  27 #include <winsock2.h>
  28 #endif
  29 #ifdef HAVE_SYS_TIME_H
  30 #include <sys/time.h>
  31 #endif
  32 #ifdef HAVE_UNISTD_H
  33 #include <unistd.h>
  34 #endif
  35
  36 int poll( struct pollfd *fds, unsigned int count, int timeout )
  37 {
  38     fd_set read_set, write_set, except_set;
  39     unsigned int i;
  40     int maxfd = -1, ret;
  41
  42     FD_ZERO( &read_set );
  43     FD_ZERO( &write_set );
  44     FD_ZERO( &except_set );
  45
  46     for (i = 0; i < count; i++)
  47     {
  48         if (fds[i].fd == -1) continue;
  49         if (fds[i].events & (POLLIN|POLLPRI)) FD_SET( fds[i].fd, &read_set  );
  50         if (fds[i].events & POLLOUT) FD_SET( fds[i].fd, &write_set );
  51         FD_SET( fds[i].fd, &except_set );  /* POLLERR etc. are always selected */
  52         if (fds[i].fd > maxfd) maxfd = fds[i].fd;
  53     }
  54     if (timeout != -1)
  55     {
  56         struct timeval tv;
  57         tv.tv_sec = timeout / 1000;
  58         tv.tv_usec = timeout % 1000;
  59         ret = select( maxfd + 1, &read_set, &write_set, &except_set, &tv );
  60     }
  61     else ret = select( maxfd + 1, &read_set, &write_set, &except_set, NULL );
  62
  63     if (ret >= 0)
  64     {
  65         for (i = 0; i < count; i++)
  66         {
  67             fds[i].revents = 0;
  68             if (fds[i].fd == -1) continue;
  69             if (FD_ISSET( fds[i].fd, &read_set )) fds[i].revents |= POLLIN;
  70             if (FD_ISSET( fds[i].fd, &write_set )) fds[i].revents |= POLLOUT;
  71             if (FD_ISSET( fds[i].fd, &except_set )) fds[i].revents |= POLLERR;
  72         }
  73     }
  74     return ret;
  75 }
  76
  77 #endif /* HAVE_POLL */