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212380e3 | 1 | /* |
2 | * ircd-ratbox: A slightly useful ircd. | |
3 | * epoll.c: Linux epoll 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 | * Copyright (C) 2002 Aaron Sethman <androsyn@ratbox.org> | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License as published by | |
13 | * the Free Software Foundation; either version 2 of the License, or | |
14 | * (at your option) any later version. | |
15 | * | |
16 | * This program is distributed in the hope that it will be useful, | |
17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | * GNU General Public License for more details. | |
20 | * | |
21 | * You should have received a copy of the GNU General Public License | |
22 | * along with this program; if not, write to the Free Software | |
23 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 | |
24 | * USA | |
25 | * | |
e70f8e92 | 26 | * $Id: epoll.c 3229 2007-03-05 17:23:07Z nenolod $ |
212380e3 | 27 | */ |
28 | ||
29 | #include "config.h" | |
30 | #include "stdinc.h" | |
31 | #include <sys/epoll.h> | |
32 | ||
33 | #include "libcharybdis.h" | |
34 | ||
35 | static int ep; /* epoll file descriptor */ | |
36 | static struct epoll_event *pfd; | |
37 | static int pfd_size; | |
38 | ||
39 | ||
40 | #ifndef HAVE_EPOLL_CTL /* bah..glibc doesn't support epoll yet.. */ | |
41 | #include <sys/epoll.h> | |
42 | #include <sys/syscall.h> | |
43 | ||
44 | _syscall1(int, epoll_create, int, maxfds); | |
45 | _syscall4(int, epoll_ctl, int, epfd, int, op, int, fd, struct epoll_event *, events); | |
46 | _syscall4(int, epoll_wait, int, epfd, struct epoll_event *, pevents, | |
47 | int, maxevents, int, timeout); | |
48 | ||
49 | #endif /* HAVE_EPOLL_CTL */ | |
50 | ||
51 | ||
52 | /* | |
53 | * init_netio | |
54 | * | |
55 | * This is a needed exported function which will be called to initialise | |
56 | * the network loop code. | |
57 | */ | |
58 | void | |
59 | init_netio(void) | |
60 | { | |
61 | pfd_size = getdtablesize(); | |
62 | ep = epoll_create(pfd_size); | |
63 | pfd = MyMalloc(sizeof(struct epoll_event) * pfd_size); | |
64 | if(ep < 0) | |
65 | { | |
66 | fprintf(stderr, "init_netio: Couldn't open epoll fd!\n"); | |
67 | exit(115); /* Whee! */ | |
68 | } | |
69 | comm_note(ep, "epoll file descriptor"); | |
70 | } | |
71 | ||
72 | /* | |
73 | * comm_setselect | |
74 | * | |
75 | * This is a needed exported function which will be called to register | |
76 | * and deregister interest in a pending IO state for a given FD. | |
77 | */ | |
78 | void | |
79 | comm_setselect(int fd, fdlist_t list, unsigned int type, PF * handler, | |
80 | void *client_data, time_t timeout) | |
81 | { | |
82 | struct epoll_event ep_event; | |
e70f8e92 | 83 | fde_t *F = comm_locate_fd(fd); |
212380e3 | 84 | int old_flags = F->pflags; |
85 | int op = -1; | |
86 | ||
87 | s_assert(fd >= 0); | |
88 | s_assert(F->flags.open); | |
89 | ||
90 | /* Update the list, even though we're not using it .. */ | |
91 | F->list = list; | |
92 | if(type & COMM_SELECT_READ) | |
93 | { | |
94 | if(handler != NULL) | |
95 | F->pflags |= EPOLLIN; | |
96 | else | |
97 | F->pflags &= ~EPOLLIN; | |
98 | F->read_handler = handler; | |
99 | F->read_data = client_data; | |
100 | } | |
101 | ||
102 | if(type & COMM_SELECT_WRITE) | |
103 | { | |
104 | if(handler != NULL) | |
105 | F->pflags |= EPOLLOUT; | |
106 | else | |
107 | F->pflags &= ~EPOLLOUT; | |
108 | F->write_handler = handler; | |
109 | F->write_data = client_data; | |
110 | } | |
111 | ||
112 | if(timeout) | |
113 | F->timeout = CurrentTime + (timeout / 1000); | |
114 | ||
115 | if(old_flags == 0 && F->pflags == 0) | |
116 | return; | |
117 | else if(F->pflags <= 0) | |
118 | op = EPOLL_CTL_DEL; | |
119 | else if(old_flags == 0 && F->pflags > 0) | |
120 | op = EPOLL_CTL_ADD; | |
121 | else if(F->pflags != old_flags) | |
122 | op = EPOLL_CTL_MOD; | |
123 | ||
124 | if(op == -1) | |
125 | return; | |
126 | ||
127 | ||
128 | ep_event.events = F->pflags; | |
129 | ep_event.data.ptr = F; | |
130 | ||
131 | if(epoll_ctl(ep, op, fd, &ep_event) != 0) | |
132 | { | |
133 | libcharybdis_log("comm_setselect(): epoll_ctl failed: %s", strerror(errno)); | |
134 | abort(); | |
135 | } | |
136 | ||
137 | ||
138 | } | |
139 | ||
140 | /* | |
141 | * comm_select | |
142 | * | |
143 | * Called to do the new-style IO, courtesy of squid (like most of this | |
144 | * new IO code). This routine handles the stuff we've hidden in | |
145 | * comm_setselect and fd_table[] and calls callbacks for IO ready | |
146 | * events. | |
147 | */ | |
148 | ||
149 | int | |
150 | comm_select(unsigned long delay) | |
151 | { | |
152 | int num, i, flags, old_flags, op; | |
153 | struct epoll_event ep_event; | |
154 | void *data; | |
155 | ||
156 | num = epoll_wait(ep, pfd, pfd_size, delay); | |
157 | set_time(); | |
158 | if(num < 0 && !ignoreErrno(errno)) | |
159 | { | |
160 | return COMM_ERROR; | |
161 | } | |
162 | ||
163 | if(num == 0) | |
164 | return COMM_OK; | |
165 | for (i = 0; i < num; i++) | |
166 | { | |
167 | PF *hdl; | |
168 | fde_t *F = pfd[i].data.ptr; | |
169 | old_flags = F->pflags; | |
170 | if(pfd[i].events & (EPOLLIN | EPOLLHUP | EPOLLERR)) | |
171 | { | |
172 | hdl = F->read_handler; | |
173 | data = F->read_data; | |
174 | F->read_handler = NULL; | |
175 | F->read_data = NULL; | |
176 | if(hdl) { | |
177 | hdl(F->fd, data); | |
178 | } | |
179 | else | |
180 | libcharybdis_log("epoll.c: NULL read handler called"); | |
181 | ||
182 | } | |
183 | ||
184 | ||
185 | if(F->flags.open == 0) | |
186 | continue; | |
187 | if(pfd[i].events & (EPOLLOUT | EPOLLHUP | EPOLLERR)) | |
188 | { | |
189 | hdl = F->write_handler; | |
190 | data = F->write_data; | |
191 | F->write_handler = NULL; | |
192 | F->write_data = NULL; | |
193 | ||
194 | if(hdl) { | |
195 | hdl(F->fd, data); | |
196 | } | |
197 | else | |
198 | libcharybdis_log("epoll.c: NULL write handler called"); | |
199 | } | |
200 | ||
201 | if(F->flags.open == 0) | |
202 | continue; | |
203 | ||
204 | flags = 0; | |
205 | ||
206 | if(F->read_handler != NULL) | |
207 | flags |= EPOLLIN; | |
208 | if(F->write_handler != NULL) | |
209 | flags |= EPOLLOUT; | |
210 | ||
211 | if(old_flags != flags) | |
212 | { | |
213 | if(flags == 0) | |
214 | op = EPOLL_CTL_DEL; | |
215 | else | |
216 | op = EPOLL_CTL_MOD; | |
217 | F->pflags = ep_event.events = flags; | |
218 | ep_event.data.ptr = F; | |
219 | if(epoll_ctl(ep, op, F->fd, &ep_event) != 0) | |
220 | { | |
221 | libcharybdis_log("comm_setselect(): epoll_ctl failed: %s", strerror(errno)); | |
222 | } | |
223 | } | |
224 | ||
225 | } | |
226 | return COMM_OK; | |
227 | } | |
228 |