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a6cda4dd FT |
1 | /* |
2 | ashd - A Sane HTTP Daemon | |
3 | Copyright (C) 2008 Fredrik Tolf <fredrik@dolda2000.com> | |
4 | ||
5 | This program is free software: you can redistribute it and/or modify | |
6 | it under the terms of the GNU General Public License as published by | |
7 | the Free Software Foundation, either version 3 of the License, or | |
8 | (at your option) any later version. | |
9 | ||
10 | This program is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | GNU General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU General Public License | |
16 | along with this program. If not, see <http://www.gnu.org/licenses/>. | |
17 | */ | |
18 | ||
19 | #include <stdlib.h> | |
20 | #include <string.h> | |
3f3a9a68 FT |
21 | #include <time.h> |
22 | #include <unistd.h> | |
a6cda4dd FT |
23 | #include <errno.h> |
24 | #include <sys/select.h> | |
25 | ||
26 | #ifdef HAVE_CONFIG_H | |
27 | #include <config.h> | |
28 | #endif | |
29 | #include <log.h> | |
30 | #include <utils.h> | |
31 | #include <mt.h> | |
32 | #include <mtio.h> | |
33 | ||
34 | static struct blocker *blockers; | |
9d32586e | 35 | static int exitstatus; |
a6cda4dd FT |
36 | |
37 | struct blocker { | |
38 | struct blocker *n, *p; | |
39 | int fd; | |
205ee933 | 40 | int ev, rev, id; |
a6cda4dd FT |
41 | time_t to; |
42 | struct muth *th; | |
43 | }; | |
44 | ||
205ee933 | 45 | static void addblock(struct blocker *bl) |
a6cda4dd | 46 | { |
a6cda4dd FT |
47 | bl->n = blockers; |
48 | if(blockers) | |
49 | blockers->p = bl; | |
50 | blockers = bl; | |
205ee933 FT |
51 | } |
52 | ||
53 | static void remblock(struct blocker *bl) | |
54 | { | |
a6cda4dd FT |
55 | if(bl->n) |
56 | bl->n->p = bl->p; | |
57 | if(bl->p) | |
58 | bl->p->n = bl->n; | |
59 | if(bl == blockers) | |
60 | blockers = bl->n; | |
205ee933 FT |
61 | } |
62 | ||
63 | struct selected mblock(time_t to, int n, struct selected *spec) | |
64 | { | |
65 | int i, id; | |
66 | struct blocker bls[n]; | |
67 | ||
68 | to = (to > 0)?(time(NULL) + to):0; | |
69 | for(i = 0; i < n; i++) { | |
70 | bls[i] = (struct blocker){ | |
71 | .fd = spec[i].fd, | |
72 | .ev = spec[i].ev, | |
73 | .id = i, | |
74 | .to = to, | |
75 | .th = current, | |
76 | }; | |
77 | addblock(&bls[i]); | |
78 | } | |
79 | id = yield(); | |
80 | for(i = 0; i < n; i++) | |
81 | remblock(&bls[i]); | |
82 | if(id < 0) | |
83 | return((struct selected){.fd = -1, .ev = -1}); | |
84 | return((struct selected){.fd = bls[id].fd, .ev = bls[id].rev}); | |
85 | } | |
86 | ||
87 | int block(int fd, int ev, time_t to) | |
88 | { | |
89 | struct blocker bl; | |
90 | int rv; | |
91 | ||
92 | if(fd >= FD_SETSIZE) { | |
93 | flog(LOG_ERR, "tried to use more file descriptors than select() can handle: fd %i", fd); | |
94 | errno = EMFILE; | |
95 | return(-1); | |
96 | } | |
97 | bl = (struct blocker) { | |
98 | .fd = fd, | |
99 | .ev = ev, | |
100 | .id = -1, | |
101 | .to = (to > 0)?(time(NULL) + to):0, | |
102 | .th = current, | |
103 | }; | |
104 | addblock(&bl); | |
105 | rv = yield(); | |
106 | remblock(&bl); | |
a6cda4dd FT |
107 | return(rv); |
108 | } | |
109 | ||
9d32586e | 110 | int ioloop(void) |
a6cda4dd FT |
111 | { |
112 | int ret; | |
113 | fd_set rfds, wfds, efds; | |
114 | struct blocker *bl, *nbl; | |
115 | struct timeval toval; | |
116 | time_t now, timeout; | |
117 | int maxfd; | |
118 | int ev; | |
119 | ||
9d32586e | 120 | exitstatus = 0; |
a6cda4dd FT |
121 | while(blockers != NULL) { |
122 | FD_ZERO(&rfds); | |
123 | FD_ZERO(&wfds); | |
124 | FD_ZERO(&efds); | |
125 | maxfd = 0; | |
126 | now = time(NULL); | |
127 | timeout = 0; | |
128 | for(bl = blockers; bl; bl = bl->n) { | |
129 | if(bl->ev & EV_READ) | |
130 | FD_SET(bl->fd, &rfds); | |
131 | if(bl->ev & EV_WRITE) | |
132 | FD_SET(bl->fd, &wfds); | |
133 | FD_SET(bl->fd, &efds); | |
134 | if(bl->fd > maxfd) | |
135 | maxfd = bl->fd; | |
136 | if((bl->to != 0) && ((timeout == 0) || (timeout > bl->to))) | |
137 | timeout = bl->to; | |
138 | } | |
9d32586e FT |
139 | if(exitstatus) |
140 | return(exitstatus); | |
a6cda4dd FT |
141 | toval.tv_sec = timeout - now; |
142 | toval.tv_usec = 0; | |
143 | ret = select(maxfd + 1, &rfds, &wfds, &efds, timeout?(&toval):NULL); | |
144 | if(ret < 0) { | |
145 | if(errno != EINTR) { | |
146 | flog(LOG_CRIT, "ioloop: select errored out: %s", strerror(errno)); | |
147 | /* To avoid CPU hogging in case it's bad, which it | |
148 | * probably is. */ | |
149 | sleep(1); | |
150 | } | |
9d32586e FT |
151 | } else { |
152 | now = time(NULL); | |
153 | for(bl = blockers; bl; bl = nbl) { | |
154 | nbl = bl->n; | |
155 | ev = 0; | |
156 | if(FD_ISSET(bl->fd, &rfds)) | |
157 | ev |= EV_READ; | |
158 | if(FD_ISSET(bl->fd, &wfds)) | |
159 | ev |= EV_WRITE; | |
160 | if(FD_ISSET(bl->fd, &efds)) | |
161 | ev = -1; | |
205ee933 FT |
162 | if((ev < 0) || (ev & bl->ev)) { |
163 | if(bl->id < 0) { | |
164 | resume(bl->th, ev); | |
165 | } else { | |
166 | bl->rev = ev; | |
167 | resume(bl->th, bl->id); | |
168 | } | |
169 | } else if((bl->to != 0) && (bl->to <= now)) { | |
170 | if(bl->id < 0) { | |
171 | resume(bl->th, 0); | |
172 | } else { | |
173 | bl->rev = 0; | |
174 | resume(bl->th, bl->id); | |
175 | } | |
176 | } | |
9d32586e | 177 | } |
a6cda4dd FT |
178 | } |
179 | } | |
9d32586e FT |
180 | return(0); |
181 | } | |
182 | ||
183 | void exitioloop(int status) | |
184 | { | |
185 | exitstatus = status; | |
a6cda4dd | 186 | } |