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1 | /* |
2 | * poll.c |
3 | * - wrappers for poll(2) |
4 | */ |
5 | /* |
a79ac5ba |
6 | * This file is |
7 | * Copyright (C) 1997-1999 Ian Jackson <ian@davenant.greenend.org.uk> |
8 | * |
9 | * It is part of adns, which is |
10 | * Copyright (C) 1997-1999 Ian Jackson <ian@davenant.greenend.org.uk> |
11 | * Copyright (C) 1999 Tony Finch <dot@dotat.at> |
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12 | * |
13 | * This program is free software; you can redistribute it and/or modify |
14 | * it under the terms of the GNU General Public License as published by |
15 | * the Free Software Foundation; either version 2, or (at your option) |
16 | * any later version. |
17 | * |
18 | * This program is distributed in the hope that it will be useful, |
19 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
20 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
21 | * GNU General Public License for more details. |
22 | * |
23 | * You should have received a copy of the GNU General Public License |
24 | * along with this program; if not, write to the Free Software Foundation, |
25 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
26 | */ |
27 | |
28 | #include <limits.h> |
ef20fccf |
29 | #include <string.h> |
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30 | |
31 | #include "internal.h" |
32 | |
33 | #ifdef HAVE_POLL |
34 | |
35 | int adns_beforepoll(adns_state ads, struct pollfd *fds, int *nfds_io, int *timeout_io, |
36 | const struct timeval *now) { |
37 | struct timeval tv_nowbuf, tv_tobuf, *tv_to; |
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38 | int space, found, timeout_ms, r; |
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39 | struct pollfd fds_tmp[MAX_POLLFDS]; |
40 | |
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41 | adns__consistency(ads,0,cc_entex); |
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42 | |
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43 | if (timeout_io) { |
44 | adns__must_gettimeofday(ads,&now,&tv_nowbuf); |
1389dc72 |
45 | if (!now) { *nfds_io= 0; r= 0; goto xit; } |
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46 | |
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47 | timeout_ms= *timeout_io; |
48 | if (timeout_ms == -1) { |
49 | tv_to= 0; |
50 | } else { |
51 | tv_tobuf.tv_sec= timeout_ms / 1000; |
52 | tv_tobuf.tv_usec= (timeout_ms % 1000)*1000; |
53 | tv_to= &tv_tobuf; |
54 | } |
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55 | |
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56 | adns__timeouts(ads, 0, &tv_to,&tv_tobuf, *now); |
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57 | |
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58 | if (tv_to) { |
59 | assert(tv_to == &tv_tobuf); |
60 | timeout_ms= (tv_tobuf.tv_usec+999)/1000; |
61 | assert(tv_tobuf.tv_sec < (INT_MAX-timeout_ms)/1000); |
62 | timeout_ms += tv_tobuf.tv_sec*1000; |
63 | } else { |
64 | timeout_ms= -1; |
65 | } |
66 | *timeout_io= timeout_ms; |
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67 | } |
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68 | |
69 | space= *nfds_io; |
70 | if (space >= MAX_POLLFDS) { |
71 | found= adns__pollfds(ads,fds); |
72 | *nfds_io= found; |
73 | } else { |
74 | found= adns__pollfds(ads,fds_tmp); |
75 | *nfds_io= found; |
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76 | if (space < found) { r= ERANGE; goto xit; } |
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77 | memcpy(fds,fds_tmp,sizeof(struct pollfd)*found); |
78 | } |
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79 | r= 0; |
80 | xit: |
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81 | adns__consistency(ads,0,cc_entex); |
1389dc72 |
82 | return r; |
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83 | } |
84 | |
85 | void adns_afterpoll(adns_state ads, const struct pollfd *fds, int nfds, |
86 | const struct timeval *now) { |
87 | struct timeval tv_buf; |
88 | |
2ac463bf |
89 | adns__consistency(ads,0,cc_entex); |
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90 | adns__must_gettimeofday(ads,&now,&tv_buf); |
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91 | if (now) { |
92 | adns__timeouts(ads, 1, 0,0, *now); |
93 | adns__fdevents(ads, fds,nfds, 0,0,0,0, *now,0); |
94 | } |
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95 | adns__consistency(ads,0,cc_entex); |
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96 | } |
97 | |
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98 | int adns_wait_poll(adns_state ads, |
99 | adns_query *query_io, |
100 | adns_answer **answer_r, |
101 | void **context_r) { |
102 | int r, nfds, to; |
103 | struct pollfd fds[MAX_POLLFDS]; |
104 | |
105 | adns__consistency(ads,0,cc_entex); |
106 | |
107 | for (;;) { |
108 | r= adns__internal_check(ads,query_io,answer_r,context_r); |
c6f9dc7b |
109 | if (r != EAGAIN) goto xit; |
ef20fccf |
110 | nfds= MAX_POLLFDS; to= -1; |
111 | adns_beforepoll(ads,fds,&nfds,&to,0); |
112 | r= poll(fds,nfds,to); |
113 | if (r == -1) { |
114 | if (errno == EINTR) { |
115 | if (ads->iflags & adns_if_eintr) { r= EINTR; goto xit; } |
116 | } else { |
117 | adns__diag(ads,-1,0,"poll failed in wait: %s",strerror(errno)); |
118 | adns_globalsystemfailure(ads); |
119 | } |
120 | } else { |
121 | assert(r >= 0); |
122 | adns_afterpoll(ads,fds,nfds,0); |
123 | } |
124 | } |
125 | |
126 | xit: |
127 | adns__consistency(ads,0,cc_entex); |
128 | return r; |
129 | } |
130 | |
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131 | #endif |