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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> |
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24 | #include <string.h> |
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25 | |
26 | #include "internal.h" |
27 | |
28 | #ifdef HAVE_POLL |
29 | |
30 | int adns_beforepoll(adns_state ads, struct pollfd *fds, int *nfds_io, int *timeout_io, |
31 | const struct timeval *now) { |
32 | struct timeval tv_nowbuf, tv_tobuf, *tv_to; |
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33 | int space, found, timeout_ms, r; |
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34 | struct pollfd fds_tmp[MAX_POLLFDS]; |
35 | |
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36 | adns__consistency(ads,0,cc_entex); |
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37 | |
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38 | if (timeout_io) { |
39 | adns__must_gettimeofday(ads,&now,&tv_nowbuf); |
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40 | if (!now) { *nfds_io= 0; r= 0; goto xit; } |
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41 | |
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42 | timeout_ms= *timeout_io; |
43 | if (timeout_ms == -1) { |
44 | tv_to= 0; |
45 | } else { |
46 | tv_tobuf.tv_sec= timeout_ms / 1000; |
47 | tv_tobuf.tv_usec= (timeout_ms % 1000)*1000; |
48 | tv_to= &tv_tobuf; |
49 | } |
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50 | |
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51 | adns__timeouts(ads, 0, &tv_to,&tv_tobuf, *now); |
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52 | |
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53 | if (tv_to) { |
54 | assert(tv_to == &tv_tobuf); |
55 | timeout_ms= (tv_tobuf.tv_usec+999)/1000; |
56 | assert(tv_tobuf.tv_sec < (INT_MAX-timeout_ms)/1000); |
57 | timeout_ms += tv_tobuf.tv_sec*1000; |
58 | } else { |
59 | timeout_ms= -1; |
60 | } |
61 | *timeout_io= timeout_ms; |
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62 | } |
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63 | |
64 | space= *nfds_io; |
65 | if (space >= MAX_POLLFDS) { |
66 | found= adns__pollfds(ads,fds); |
67 | *nfds_io= found; |
68 | } else { |
69 | found= adns__pollfds(ads,fds_tmp); |
70 | *nfds_io= found; |
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71 | if (space < found) { r= ERANGE; goto xit; } |
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72 | memcpy(fds,fds_tmp,sizeof(struct pollfd)*found); |
73 | } |
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74 | r= 0; |
75 | xit: |
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76 | adns__consistency(ads,0,cc_entex); |
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77 | return r; |
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78 | } |
79 | |
80 | void adns_afterpoll(adns_state ads, const struct pollfd *fds, int nfds, |
81 | const struct timeval *now) { |
82 | struct timeval tv_buf; |
83 | |
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84 | adns__consistency(ads,0,cc_entex); |
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85 | adns__must_gettimeofday(ads,&now,&tv_buf); |
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86 | if (now) { |
87 | adns__timeouts(ads, 1, 0,0, *now); |
88 | adns__fdevents(ads, fds,nfds, 0,0,0,0, *now,0); |
89 | } |
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90 | adns__consistency(ads,0,cc_entex); |
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91 | } |
92 | |
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93 | int adns_wait_poll(adns_state ads, |
94 | adns_query *query_io, |
95 | adns_answer **answer_r, |
96 | void **context_r) { |
97 | int r, nfds, to; |
98 | struct pollfd fds[MAX_POLLFDS]; |
99 | |
100 | adns__consistency(ads,0,cc_entex); |
101 | |
102 | for (;;) { |
103 | r= adns__internal_check(ads,query_io,answer_r,context_r); |
104 | if (r != EWOULDBLOCK) goto xit; |
105 | nfds= MAX_POLLFDS; to= -1; |
106 | adns_beforepoll(ads,fds,&nfds,&to,0); |
107 | r= poll(fds,nfds,to); |
108 | if (r == -1) { |
109 | if (errno == EINTR) { |
110 | if (ads->iflags & adns_if_eintr) { r= EINTR; goto xit; } |
111 | } else { |
112 | adns__diag(ads,-1,0,"poll failed in wait: %s",strerror(errno)); |
113 | adns_globalsystemfailure(ads); |
114 | } |
115 | } else { |
116 | assert(r >= 0); |
117 | adns_afterpoll(ads,fds,nfds,0); |
118 | } |
119 | } |
120 | |
121 | xit: |
122 | adns__consistency(ads,0,cc_entex); |
123 | return r; |
124 | } |
125 | |
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126 | #endif |