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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; | |
35 | ||
36 | struct blocker { | |
37 | struct blocker *n, *p; | |
38 | int fd; | |
39 | int ev; | |
40 | time_t to; | |
41 | struct muth *th; | |
42 | }; | |
43 | ||
44 | int block(int fd, int ev, time_t to) | |
45 | { | |
46 | struct blocker *bl; | |
47 | int rv; | |
48 | ||
886fff4d FT |
49 | if(fd >= FD_SETSIZE) { |
50 | flog(LOG_ERR, "tried to use more file descriptors than select() can handle: fd %i", fd); | |
51 | errno = EMFILE; | |
52 | return(-1); | |
53 | } | |
a6cda4dd FT |
54 | omalloc(bl); |
55 | bl->fd = fd; | |
56 | bl->ev = ev; | |
57 | if(to > 0) | |
58 | bl->to = time(NULL) + to; | |
59 | bl->th = current; | |
60 | bl->n = blockers; | |
61 | if(blockers) | |
62 | blockers->p = bl; | |
63 | blockers = bl; | |
64 | rv = yield(); | |
65 | if(bl->n) | |
66 | bl->n->p = bl->p; | |
67 | if(bl->p) | |
68 | bl->p->n = bl->n; | |
69 | if(bl == blockers) | |
70 | blockers = bl->n; | |
71 | free(bl); | |
72 | return(rv); | |
73 | } | |
74 | ||
75 | void ioloop(void) | |
76 | { | |
77 | int ret; | |
78 | fd_set rfds, wfds, efds; | |
79 | struct blocker *bl, *nbl; | |
80 | struct timeval toval; | |
81 | time_t now, timeout; | |
82 | int maxfd; | |
83 | int ev; | |
84 | ||
85 | while(blockers != NULL) { | |
86 | FD_ZERO(&rfds); | |
87 | FD_ZERO(&wfds); | |
88 | FD_ZERO(&efds); | |
89 | maxfd = 0; | |
90 | now = time(NULL); | |
91 | timeout = 0; | |
92 | for(bl = blockers; bl; bl = bl->n) { | |
93 | if(bl->ev & EV_READ) | |
94 | FD_SET(bl->fd, &rfds); | |
95 | if(bl->ev & EV_WRITE) | |
96 | FD_SET(bl->fd, &wfds); | |
97 | FD_SET(bl->fd, &efds); | |
98 | if(bl->fd > maxfd) | |
99 | maxfd = bl->fd; | |
100 | if((bl->to != 0) && ((timeout == 0) || (timeout > bl->to))) | |
101 | timeout = bl->to; | |
102 | } | |
103 | toval.tv_sec = timeout - now; | |
104 | toval.tv_usec = 0; | |
105 | ret = select(maxfd + 1, &rfds, &wfds, &efds, timeout?(&toval):NULL); | |
106 | if(ret < 0) { | |
107 | if(errno != EINTR) { | |
108 | flog(LOG_CRIT, "ioloop: select errored out: %s", strerror(errno)); | |
109 | /* To avoid CPU hogging in case it's bad, which it | |
110 | * probably is. */ | |
111 | sleep(1); | |
112 | } | |
113 | } | |
114 | now = time(NULL); | |
115 | for(bl = blockers; bl; bl = nbl) { | |
116 | nbl = bl->n; | |
117 | ev = 0; | |
118 | if(FD_ISSET(bl->fd, &rfds)) | |
119 | ev |= EV_READ; | |
120 | if(FD_ISSET(bl->fd, &wfds)) | |
121 | ev |= EV_WRITE; | |
122 | if(FD_ISSET(bl->fd, &efds)) | |
123 | ev = -1; | |
124 | if((ev < 0) || (ev & bl->ev)) | |
125 | resume(bl->th, ev); | |
126 | else if((bl->to != 0) && (bl->to <= now)) | |
127 | resume(bl->th, 0); | |
128 | } | |
129 | } | |
130 | } |