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83723896 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> | |
e1cdf02e FT |
20 | #include <stdio.h> |
21 | #include <fcntl.h> | |
83723896 FT |
22 | #include <unistd.h> |
23 | #include <string.h> | |
24 | #include <time.h> | |
25 | #include <errno.h> | |
26 | #include <sys/select.h> | |
e1cdf02e | 27 | #include <sys/socket.h> |
83723896 FT |
28 | |
29 | #ifdef HAVE_CONFIG_H | |
30 | #include <config.h> | |
31 | #endif | |
32 | #include <log.h> | |
33 | #include <utils.h> | |
34 | #include <mt.h> | |
35 | #include <mtio.h> | |
36 | ||
37 | struct blocker { | |
38 | struct blocker *n, *p; | |
39 | int fd; | |
40 | int ev; | |
41 | time_t to; | |
42 | struct muth *th; | |
43 | }; | |
44 | ||
45 | static struct blocker *blockers; | |
46 | ||
47 | int block(int fd, int ev, time_t to) | |
48 | { | |
49 | struct blocker *bl; | |
50 | int rv; | |
51 | ||
52 | omalloc(bl); | |
53 | bl->fd = fd; | |
54 | bl->ev = ev; | |
55 | if(to > 0) | |
56 | bl->to = time(NULL) + to; | |
57 | bl->th = current; | |
58 | bl->n = blockers; | |
59 | if(blockers) | |
60 | blockers->p = bl; | |
61 | blockers = bl; | |
62 | rv = yield(); | |
63 | if(bl->n) | |
64 | bl->n->p = bl->p; | |
65 | if(bl->p) | |
66 | bl->p->n = bl->n; | |
67 | if(bl == blockers) | |
68 | blockers = bl->n; | |
96fc434a | 69 | free(bl); |
83723896 FT |
70 | return(rv); |
71 | } | |
72 | ||
73 | void ioloop(void) | |
74 | { | |
75 | int ret; | |
76 | fd_set rfds, wfds, efds; | |
77 | struct blocker *bl, *nbl; | |
78 | struct timeval toval; | |
79 | time_t now, timeout; | |
80 | int maxfd; | |
81 | int ev; | |
82 | ||
83 | while(blockers != NULL) { | |
84 | FD_ZERO(&rfds); | |
85 | FD_ZERO(&wfds); | |
86 | FD_ZERO(&efds); | |
87 | maxfd = 0; | |
88 | now = time(NULL); | |
89 | timeout = 0; | |
90 | for(bl = blockers; bl; bl = bl->n) { | |
91 | if(bl->ev & EV_READ) | |
92 | FD_SET(bl->fd, &rfds); | |
93 | if(bl->ev & EV_WRITE) | |
94 | FD_SET(bl->fd, &wfds); | |
95 | FD_SET(bl->fd, &efds); | |
96 | if(bl->fd > maxfd) | |
97 | maxfd = bl->fd; | |
98 | if((bl->to != 0) && ((timeout == 0) || (timeout > bl->to))) | |
99 | timeout = bl->to; | |
100 | } | |
101 | toval.tv_sec = timeout - now; | |
102 | toval.tv_usec = 0; | |
103 | ret = select(maxfd + 1, &rfds, &wfds, &efds, timeout?(&toval):NULL); | |
104 | if(ret < 0) { | |
105 | if(errno != EINTR) { | |
106 | flog(LOG_CRIT, "ioloop: select errored out: %s", strerror(errno)); | |
107 | /* To avoid CPU hogging in case it's bad, which it | |
108 | * probably is. */ | |
109 | sleep(1); | |
110 | } | |
111 | } | |
112 | now = time(NULL); | |
113 | for(bl = blockers; bl; bl = nbl) { | |
114 | nbl = bl->n; | |
115 | ev = 0; | |
116 | if(FD_ISSET(bl->fd, &rfds)) | |
117 | ev |= EV_READ; | |
118 | if(FD_ISSET(bl->fd, &wfds)) | |
119 | ev |= EV_WRITE; | |
120 | if(FD_ISSET(bl->fd, &efds)) | |
121 | ev = -1; | |
3dc69b45 | 122 | if((ev < 0) || (ev & bl->ev)) |
83723896 FT |
123 | resume(bl->th, ev); |
124 | else if((bl->to != 0) && (bl->to <= now)) | |
125 | resume(bl->th, 0); | |
126 | } | |
127 | } | |
128 | } | |
e1cdf02e FT |
129 | |
130 | struct stdiofd { | |
131 | int fd; | |
132 | int sock; | |
133 | int timeout; | |
134 | }; | |
135 | ||
136 | static ssize_t mtread(void *cookie, char *buf, size_t len) | |
137 | { | |
138 | struct stdiofd *d = cookie; | |
139 | int ev; | |
140 | ssize_t ret; | |
141 | ||
142 | while(1) { | |
143 | ret = read(d->fd, buf, len); | |
144 | if((ret < 0) && (errno == EAGAIN)) { | |
145 | ev = block(d->fd, EV_READ, d->timeout); | |
146 | if(ev < 0) { | |
147 | /* If we just go on, we should get the real error. */ | |
148 | continue; | |
149 | } else if(ev == 0) { | |
150 | errno = ETIMEDOUT; | |
151 | return(-1); | |
152 | } else { | |
153 | continue; | |
154 | } | |
155 | } else { | |
156 | return(ret); | |
157 | } | |
158 | } | |
159 | } | |
160 | ||
161 | static ssize_t mtwrite(void *cookie, const char *buf, size_t len) | |
162 | { | |
163 | struct stdiofd *d = cookie; | |
164 | int ev; | |
9dc25d3d | 165 | size_t off; |
e1cdf02e FT |
166 | ssize_t ret; |
167 | ||
9dc25d3d FT |
168 | off = 0; |
169 | while(off < len) { | |
e1cdf02e | 170 | if(d->sock) |
9dc25d3d | 171 | ret = send(d->fd, buf + off, len - off, MSG_DONTWAIT | MSG_NOSIGNAL); |
e1cdf02e | 172 | else |
9dc25d3d FT |
173 | ret = write(d->fd, buf + off, len - off); |
174 | if(ret < 0) { | |
175 | if(errno == EAGAIN) { | |
176 | ev = block(d->fd, EV_WRITE, d->timeout); | |
177 | if(ev < 0) { | |
178 | /* If we just go on, we should get the real error. */ | |
179 | continue; | |
180 | } else if(ev == 0) { | |
181 | errno = ETIMEDOUT; | |
182 | return(off); | |
183 | } else { | |
184 | continue; | |
185 | } | |
e1cdf02e | 186 | } else { |
9dc25d3d | 187 | return(off); |
e1cdf02e FT |
188 | } |
189 | } else { | |
9dc25d3d | 190 | off += ret; |
e1cdf02e FT |
191 | } |
192 | } | |
9dc25d3d | 193 | return(off); |
e1cdf02e FT |
194 | } |
195 | ||
196 | static int mtclose(void *cookie) | |
197 | { | |
198 | struct stdiofd *d = cookie; | |
199 | ||
200 | close(d->fd); | |
201 | free(d); | |
202 | return(0); | |
203 | } | |
204 | ||
205 | static cookie_io_functions_t iofuns = { | |
206 | .read = mtread, | |
207 | .write = mtwrite, | |
208 | .close = mtclose, | |
209 | }; | |
210 | ||
211 | FILE *mtstdopen(int fd, int issock, int timeout, char *mode) | |
212 | { | |
213 | struct stdiofd *d; | |
214 | FILE *ret; | |
215 | ||
216 | omalloc(d); | |
217 | d->fd = fd; | |
218 | d->sock = issock; | |
219 | d->timeout = timeout; | |
220 | ret = fopencookie(d, mode, iofuns); | |
221 | if(!ret) | |
222 | free(d); | |
223 | else | |
224 | fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) | O_NONBLOCK); | |
225 | return(ret); | |
226 | } |