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212380e3 AC |
1 | /* |
2 | * ircd-ratbox: A slightly useful ircd. | |
3 | * select.c: select() compatible network routines. | |
4 | * | |
5 | * Copyright (C) 1990 Jarkko Oikarinen and University of Oulu, Co Center | |
6 | * Copyright (C) 1996-2002 Hybrid Development Team | |
7 | * Copyright (C) 2001 Adrian Chadd <adrian@creative.net.au> | |
8 | * Copyright (C) 2002-2005 ircd-ratbox development team | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation; either version 2 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | * GNU General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License | |
21 | * along with this program; if not, write to the Free Software | |
22 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 | |
23 | * USA | |
24 | * | |
25 | * $Id: select.c 390 2005-12-07 18:46:56Z nenolod $ | |
26 | */ | |
27 | ||
28 | #include "config.h" | |
29 | ||
30 | #include "libcharybdis.h" | |
31 | ||
32 | #if HARD_FDLIMIT_ >= FD_SETSIZE | |
33 | #error HARD_FDLIMIT_ must be less than FD_SETSIZE(try using poll instead of select) | |
34 | #endif | |
35 | /* | |
36 | * Note that this is only a single list - multiple lists is kinda pointless | |
37 | * under select because the list size is a function of the highest FD :-) | |
38 | * -- adrian | |
39 | */ | |
40 | ||
41 | fd_set select_readfds; | |
42 | fd_set select_writefds; | |
43 | ||
44 | /* | |
45 | * You know, I'd rather have these local to comm_select but for some | |
46 | * reason my gcc decides that I can't modify them at all.. | |
47 | * -- adrian | |
48 | */ | |
49 | fd_set tmpreadfds; | |
50 | fd_set tmpwritefds; | |
51 | ||
52 | static void select_update_selectfds(int fd, short event, PF * handler); | |
53 | ||
54 | /* XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX */ | |
55 | /* Private functions */ | |
56 | ||
57 | /* | |
58 | * set and clear entries in the select array .. | |
59 | */ | |
60 | static void | |
61 | select_update_selectfds(int fd, short event, PF * handler) | |
62 | { | |
63 | /* Update the read / write set */ | |
64 | if(event & COMM_SELECT_READ) | |
65 | { | |
66 | if(handler) | |
67 | FD_SET(fd, &select_readfds); | |
68 | else | |
69 | FD_CLR(fd, &select_readfds); | |
70 | } | |
71 | if(event & COMM_SELECT_WRITE) | |
72 | { | |
73 | if(handler) | |
74 | FD_SET(fd, &select_writefds); | |
75 | else | |
76 | FD_CLR(fd, &select_writefds); | |
77 | } | |
78 | } | |
79 | ||
80 | ||
81 | /* XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX */ | |
82 | /* Public functions */ | |
83 | ||
84 | ||
85 | /* | |
86 | * init_netio | |
87 | * | |
88 | * This is a needed exported function which will be called to initialise | |
89 | * the network loop code. | |
90 | */ | |
91 | void | |
92 | init_netio(void) | |
93 | { | |
94 | FD_ZERO(&select_readfds); | |
95 | FD_ZERO(&select_writefds); | |
96 | } | |
97 | ||
98 | /* | |
99 | * comm_setselect | |
100 | * | |
101 | * This is a needed exported function which will be called to register | |
102 | * and deregister interest in a pending IO state for a given FD. | |
103 | */ | |
104 | void | |
105 | comm_setselect(int fd, fdlist_t list, unsigned int type, PF * handler, | |
106 | void *client_data, time_t timeout) | |
107 | { | |
108 | fde_t *F = &fd_table[fd]; | |
109 | s_assert(fd >= 0); | |
110 | s_assert(F->flags.open); | |
111 | ||
112 | if(type & COMM_SELECT_READ) | |
113 | { | |
114 | F->read_handler = handler; | |
115 | F->read_data = client_data; | |
116 | select_update_selectfds(fd, COMM_SELECT_READ, handler); | |
117 | } | |
118 | if(type & COMM_SELECT_WRITE) | |
119 | { | |
120 | F->write_handler = handler; | |
121 | F->write_data = client_data; | |
122 | select_update_selectfds(fd, COMM_SELECT_WRITE, handler); | |
123 | } | |
124 | if(timeout) | |
125 | F->timeout = CurrentTime + (timeout / 1000); | |
126 | } | |
127 | ||
128 | /* | |
129 | * Check all connections for new connections and input data that is to be | |
130 | * processed. Also check for connections with data queued and whether we can | |
131 | * write it out. | |
132 | */ | |
133 | ||
134 | /* | |
135 | * comm_select | |
136 | * | |
137 | * Do IO events | |
138 | */ | |
139 | ||
140 | int | |
141 | comm_select(unsigned long delay) | |
142 | { | |
143 | int num; | |
144 | int fd; | |
145 | PF *hdl; | |
146 | fde_t *F; | |
147 | struct timeval to; | |
148 | ||
149 | /* Copy over the read/write sets so we don't have to rebuild em */ | |
150 | memcpy(&tmpreadfds, &select_readfds, sizeof(fd_set)); | |
151 | memcpy(&tmpwritefds, &select_writefds, sizeof(fd_set)); | |
152 | ||
153 | for (;;) | |
154 | { | |
155 | to.tv_sec = 0; | |
156 | to.tv_usec = delay * 1000; | |
157 | num = select(highest_fd + 1, &tmpreadfds, &tmpwritefds, NULL, &to); | |
158 | if(num >= 0) | |
159 | break; | |
160 | if(ignoreErrno(errno)) | |
161 | continue; | |
162 | set_time(); | |
163 | /* error! */ | |
164 | return -1; | |
165 | /* NOTREACHED */ | |
166 | } | |
167 | set_time(); | |
168 | ||
169 | if(num == 0) | |
170 | return 0; | |
171 | ||
172 | /* XXX we *could* optimise by falling out after doing num fds ... */ | |
173 | for (fd = 0; fd < highest_fd + 1; fd++) | |
174 | { | |
175 | F = &fd_table[fd]; | |
176 | ||
177 | if(FD_ISSET(fd, &tmpreadfds)) | |
178 | { | |
179 | hdl = F->read_handler; | |
180 | F->read_handler = NULL; | |
181 | if(hdl) | |
182 | hdl(fd, F->read_data); | |
183 | } | |
184 | ||
185 | if(F->flags.open == 0) | |
186 | continue; /* Read handler closed us..go on */ | |
187 | ||
188 | if(FD_ISSET(fd, &tmpwritefds)) | |
189 | { | |
190 | hdl = F->write_handler; | |
191 | F->write_handler = NULL; | |
192 | if(hdl) | |
193 | hdl(fd, F->write_data); | |
194 | } | |
195 | ||
196 | if(F->read_handler == NULL) | |
197 | select_update_selectfds(fd, COMM_SELECT_READ, NULL); | |
198 | if(F->write_handler == NULL) | |
199 | select_update_selectfds(fd, COMM_SELECT_WRITE, NULL); | |
200 | } | |
201 | return 0; | |
202 | } | |
203 |