3 * - wrappers for poll(2)
6 * This file is part of adns, which is
7 * Copyright (C) 1997-2000,2003,2006 Ian Jackson
8 * Copyright (C) 1999-2000,2003,2006 Tony Finch
9 * Copyright (C) 1991 Massachusetts Institute of Technology
10 * (See the file INSTALL for full details.)
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2, or (at your option)
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software Foundation,
24 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
34 int adns_beforepoll(adns_state ads, struct pollfd *fds, int *nfds_io,
35 int *timeout_io, const struct timeval *now) {
36 struct timeval tv_nowbuf, tv_tobuf, *tv_to;
37 int space, found, timeout_ms, r;
38 struct pollfd fds_tmp[MAX_POLLFDS];
40 adns__consistency(ads,0,cc_entex);
43 adns__must_gettimeofday(ads,&now,&tv_nowbuf);
44 if (!now) { *nfds_io= 0; r= 0; goto xit; }
46 timeout_ms= *timeout_io;
47 if (timeout_ms == -1) {
50 tv_tobuf.tv_sec= timeout_ms / 1000;
51 tv_tobuf.tv_usec= (timeout_ms % 1000)*1000;
55 adns__timeouts(ads, 0, &tv_to,&tv_tobuf, *now);
58 assert(tv_to == &tv_tobuf);
59 timeout_ms= (tv_tobuf.tv_usec+999)/1000;
60 assert(tv_tobuf.tv_sec < (INT_MAX-timeout_ms)/1000);
61 timeout_ms += tv_tobuf.tv_sec*1000;
65 *timeout_io= timeout_ms;
69 if (space >= MAX_POLLFDS) {
70 found= adns__pollfds(ads,fds);
73 found= adns__pollfds(ads,fds_tmp);
75 if (space < found) { r= ERANGE; goto xit; }
76 memcpy(fds,fds_tmp,sizeof(struct pollfd)*found);
80 adns__consistency(ads,0,cc_entex);
84 void adns_afterpoll(adns_state ads, const struct pollfd *fds, int nfds,
85 const struct timeval *now) {
86 struct timeval tv_buf;
88 adns__consistency(ads,0,cc_entex);
89 adns__must_gettimeofday(ads,&now,&tv_buf);
91 adns__timeouts(ads, 1, 0,0, *now);
92 adns__fdevents(ads, fds,nfds, 0,0,0,0, *now,0);
94 adns__consistency(ads,0,cc_entex);
97 int adns_wait_poll(adns_state ads,
99 adns_answer **answer_r,
102 struct pollfd fds[MAX_POLLFDS];
104 adns__consistency(ads,0,cc_entex);
107 r= adns__internal_check(ads,query_io,answer_r,context_r);
108 if (r != EAGAIN) goto xit;
109 nfds= MAX_POLLFDS; to= -1;
110 adns_beforepoll(ads,fds,&nfds,&to,0);
111 r= poll(fds,nfds,to);
113 if (errno == EINTR) {
114 if (ads->iflags & adns_if_eintr) { r= EINTR; goto xit; }
116 adns__diag(ads,-1,0,"poll failed in wait: %s",strerror(errno));
117 adns_globalsystemfailure(ads);
121 adns_afterpoll(ads,fds,nfds,0);
126 adns__consistency(ads,0,cc_entex);