mdw@git.distorted.org.uk Git - adns/blob - src/poll.c

   1 /*
   2  * poll.c
   3  * - wrappers for poll(2)
   4  */
   5 /*
   6  *  This file is part of adns, which is Copyright (C) 1997-1999 Ian Jackson
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 2, or (at your option)
  11  *  any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, write to the Free Software Foundation,
  20  *  Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  21  */
  22
  23 #include <limits.h>
  24
  25 #include "internal.h"
  26
  27 #ifdef HAVE_POLL
  28
  29 int adns_beforepoll(adns_state ads, struct pollfd *fds, int *nfds_io, int *timeout_io,
  30                     const struct timeval *now) {
  31   struct timeval tv_nowbuf, tv_tobuf, *tv_to;
  32   int space, found, timeout_ms;
  33   struct pollfd fds_tmp[MAX_POLLFDS];
  34
  35   if (timeout_io) {
  36     adns__must_gettimeofday(ads,&now,&tv_nowbuf);
  37     if (!now) { *nfds_io= 0; return 0; }
  38
  39     timeout_ms= *timeout_io;
  40     if (timeout_ms == -1) {
  41       tv_to= 0;
  42     } else {
  43       tv_tobuf.tv_sec= timeout_ms / 1000;
  44       tv_tobuf.tv_usec= (timeout_ms % 1000)*1000;
  45       tv_to= &tv_tobuf;
  46     }
  47
  48     adns__timeouts(ads, 0, &tv_to,&tv_tobuf, *now);
  49
  50     if (tv_to) {
  51       assert(tv_to == &tv_tobuf);
  52       timeout_ms= (tv_tobuf.tv_usec+999)/1000;
  53       assert(tv_tobuf.tv_sec < (INT_MAX-timeout_ms)/1000);
  54       timeout_ms += tv_tobuf.tv_sec*1000;
  55     } else {
  56       timeout_ms= -1;
  57     }
  58     *timeout_io= timeout_ms;
  59   }
  60
  61   space= *nfds_io;
  62   if (space >= MAX_POLLFDS) {
  63     found= adns__pollfds(ads,fds);
  64     *nfds_io= found;
  65   } else {
  66     found= adns__pollfds(ads,fds_tmp);
  67     *nfds_io= found;
  68     if (space < found) return ERANGE;
  69     memcpy(fds,fds_tmp,sizeof(struct pollfd)*found);
  70   }
  71   return 0;
  72 }
  73
  74 void adns_afterpoll(adns_state ads, const struct pollfd *fds, int nfds,
  75                     const struct timeval *now) {
  76   struct timeval tv_buf;
  77
  78   adns__must_gettimeofday(ads,&now,&tv_buf);
  79   if (!now) return;
  80
  81   adns__timeouts(ads, 1, 0,0, *now);
  82   adns__fdevents(ads, fds,nfds, 0,0,0,0, *now,0);
  83 }
  84
  85 #endif