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 3, 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.
33 int adns_beforepoll(adns_state ads, struct pollfd *fds, int *nfds_io,
34 int *timeout_io, const struct timeval *now) {
35 struct timeval tv_nowbuf, tv_tobuf, *tv_to;
36 int space, found, timeout_ms, r;
37 struct pollfd fds_tmp[MAX_POLLFDS];
39 adns__consistency(ads,0,cc_entex);
42 adns__must_gettimeofday(ads,&now,&tv_nowbuf);
43 if (!now) { *nfds_io= 0; r= 0; goto xit; }
45 timeout_ms= *timeout_io;
46 if (timeout_ms == -1) {
49 tv_tobuf.tv_sec= timeout_ms / 1000;
50 tv_tobuf.tv_usec= (timeout_ms % 1000)*1000;
54 adns__timeouts(ads, 0, &tv_to,&tv_tobuf, *now);
57 assert(tv_to == &tv_tobuf);
58 timeout_ms= (tv_tobuf.tv_usec+999)/1000;
59 assert(tv_tobuf.tv_sec < (INT_MAX-timeout_ms)/1000);
60 timeout_ms += tv_tobuf.tv_sec*1000;
64 *timeout_io= timeout_ms;
68 if (space >= MAX_POLLFDS) {
69 found= adns__pollfds(ads,fds);
72 found= adns__pollfds(ads,fds_tmp);
74 if (space < found) { r= ERANGE; goto xit; }
75 memcpy(fds,fds_tmp,sizeof(struct pollfd)*found);
79 adns__returning(ads,0);
83 void adns_afterpoll(adns_state ads, const struct pollfd *fds, int nfds,
84 const struct timeval *now) {
85 struct timeval tv_buf;
87 adns__consistency(ads,0,cc_entex);
88 adns__must_gettimeofday(ads,&now,&tv_buf);
90 adns__timeouts(ads, 1, 0,0, *now);
91 adns__fdevents(ads, fds,nfds, 0,0,0,0, *now,0);
93 adns__returning(ads,0);
96 int adns_wait_poll(adns_state ads,
98 adns_answer **answer_r,
101 struct pollfd fds[MAX_POLLFDS];
103 adns__consistency(ads,0,cc_entex);
106 r= adns__internal_check(ads,query_io,answer_r,context_r);
107 if (r != EAGAIN) goto xit;
108 nfds= MAX_POLLFDS; to= -1;
109 adns_beforepoll(ads,fds,&nfds,&to,0);
110 r= poll(fds,nfds,to);
112 if (errno == EINTR) {
113 if (ads->iflags & adns_if_eintr) { r= EINTR; goto xit; }
115 adns__diag(ads,-1,0,"poll failed in wait: %s",strerror(errno));
116 adns_globalsystemfailure(ads);
120 adns_afterpoll(ads,fds,nfds,0);
125 adns__returning(ads,0);