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1 | /* |
2 | * poll.c |
3 | * - wrappers for poll(2) |
4 | */ |
5 | /* |
ae8cc977 |
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.) |
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11 | * |
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 |
7f8bbe29 |
14 | * the Free Software Foundation; either version 3, or (at your option) |
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15 | * any later version. |
16 | * |
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. |
21 | * |
22 | * You should have received a copy of the GNU General Public License |
8c09a4c6 |
23 | * along with this program; if not, write to the Free Software Foundation. |
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24 | */ |
25 | |
26 | #include <limits.h> |
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27 | #include <string.h> |
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28 | |
29 | #include "internal.h" |
30 | |
31 | #ifdef HAVE_POLL |
32 | |
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33 | int adns_beforepoll(adns_state ads, struct pollfd *fds, int *nfds_io, |
34 | int *timeout_io, const struct timeval *now) { |
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35 | struct timeval tv_nowbuf, tv_tobuf, *tv_to; |
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36 | int space, found, timeout_ms, r; |
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37 | struct pollfd fds_tmp[MAX_POLLFDS]; |
38 | |
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39 | adns__consistency(ads,0,cc_entex); |
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40 | |
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41 | if (timeout_io) { |
42 | adns__must_gettimeofday(ads,&now,&tv_nowbuf); |
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43 | if (!now) { *nfds_io= 0; r= 0; goto xit; } |
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44 | |
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45 | timeout_ms= *timeout_io; |
46 | if (timeout_ms == -1) { |
47 | tv_to= 0; |
48 | } else { |
49 | tv_tobuf.tv_sec= timeout_ms / 1000; |
50 | tv_tobuf.tv_usec= (timeout_ms % 1000)*1000; |
51 | tv_to= &tv_tobuf; |
52 | } |
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53 | |
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54 | adns__timeouts(ads, 0, &tv_to,&tv_tobuf, *now); |
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55 | |
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56 | if (tv_to) { |
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; |
61 | } else { |
62 | timeout_ms= -1; |
63 | } |
64 | *timeout_io= timeout_ms; |
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65 | } |
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66 | |
67 | space= *nfds_io; |
68 | if (space >= MAX_POLLFDS) { |
69 | found= adns__pollfds(ads,fds); |
70 | *nfds_io= found; |
71 | } else { |
72 | found= adns__pollfds(ads,fds_tmp); |
73 | *nfds_io= found; |
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74 | if (space < found) { r= ERANGE; goto xit; } |
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75 | memcpy(fds,fds_tmp,sizeof(struct pollfd)*found); |
76 | } |
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77 | r= 0; |
78 | xit: |
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79 | adns__returning(ads,0); |
3e2e5fab |
80 | return r; |
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81 | } |
82 | |
83 | void adns_afterpoll(adns_state ads, const struct pollfd *fds, int nfds, |
84 | const struct timeval *now) { |
85 | struct timeval tv_buf; |
86 | |
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87 | adns__consistency(ads,0,cc_entex); |
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88 | adns__must_gettimeofday(ads,&now,&tv_buf); |
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89 | if (now) { |
90 | adns__timeouts(ads, 1, 0,0, *now); |
91 | adns__fdevents(ads, fds,nfds, 0,0,0,0, *now,0); |
92 | } |
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93 | adns__returning(ads,0); |
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94 | } |
95 | |
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96 | int adns_wait_poll(adns_state ads, |
97 | adns_query *query_io, |
98 | adns_answer **answer_r, |
99 | void **context_r) { |
100 | int r, nfds, to; |
101 | struct pollfd fds[MAX_POLLFDS]; |
102 | |
103 | adns__consistency(ads,0,cc_entex); |
104 | |
105 | for (;;) { |
106 | r= adns__internal_check(ads,query_io,answer_r,context_r); |
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107 | if (r != EAGAIN) goto xit; |
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108 | nfds= MAX_POLLFDS; to= -1; |
109 | adns_beforepoll(ads,fds,&nfds,&to,0); |
110 | r= poll(fds,nfds,to); |
111 | if (r == -1) { |
112 | if (errno == EINTR) { |
113 | if (ads->iflags & adns_if_eintr) { r= EINTR; goto xit; } |
114 | } else { |
115 | adns__diag(ads,-1,0,"poll failed in wait: %s",strerror(errno)); |
116 | adns_globalsystemfailure(ads); |
117 | } |
118 | } else { |
119 | assert(r >= 0); |
120 | adns_afterpoll(ads,fds,nfds,0); |
121 | } |
122 | } |
123 | |
124 | xit: |
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125 | adns__returning(ads,0); |
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126 | return r; |
127 | } |
128 | |
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129 | #endif |