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root/svn/ircd-hybrid-8/src/s_bsd_poll.c
Revision: 1309
Committed: Sun Mar 25 11:24:18 2012 UTC (12 years ago) by michael
Content type: text/x-csrc
File size: 4946 byte(s)
Log Message:
- renaming files:

  ircd_parser.y -> conf_parser.y
  ircd_lexer.l  -> conf_lexer.l
  s_conf.c      -> conf.c
  s_conf.h      -> conf.h
  s_log.c       -> log.c
  s_log.h       -> log.h

File Contents

# Content
1 /*
2 * ircd-hybrid: an advanced Internet Relay Chat Daemon(ircd).
3 * s_bsd_poll.c: POSIX poll() compatible network routines.
4 *
5 * Originally by Adrian Chadd <adrian@creative.net.au>
6 * Copyright (C) 2002 Hybrid Development Team
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
21 * USA
22 *
23 * $Id$
24 */
25
26 #include "stdinc.h"
27 #if USE_IOPOLL_MECHANISM == __IOPOLL_MECHANISM_POLL
28 #include <sys/poll.h>
29 #include "fdlist.h"
30 #include "list.h"
31 #include "hook.h"
32 #include "ircd.h"
33 #include "s_bsd.h"
34 #include "log.h"
35
36 /* I hate linux -- adrian */
37 #ifndef POLLRDNORM
38 #define POLLRDNORM POLLIN
39 #endif
40 #ifndef POLLWRNORM
41 #define POLLWRNORM POLLOUT
42 #endif
43
44 static struct pollfd *pollfds;
45 static int pollmax = -1; /* highest FD number */
46 static dlink_node *hookptr;
47
48 /*
49 * changing_fdlimit
50 *
51 * Resize pollfds array if necessary.
52 */
53 static void *
54 changing_fdlimit(va_list args)
55 {
56 int old_fdlimit = hard_fdlimit;
57
58 pass_callback(hookptr, va_arg(args, int));
59
60 if (hard_fdlimit != old_fdlimit)
61 pollfds = MyRealloc(pollfds, sizeof(struct pollfd) * hard_fdlimit);
62
63 return NULL;
64 }
65
66 /*
67 * init_netio
68 *
69 * This is a needed exported function which will be called to initialise
70 * the network loop code.
71 */
72 void
73 init_netio(void)
74 {
75 int fd;
76
77 pollfds = MyMalloc(sizeof(struct pollfd) * hard_fdlimit);
78
79 for (fd = 0; fd < hard_fdlimit; fd++)
80 pollfds[fd].fd = -1;
81
82 hookptr = install_hook(fdlimit_cb, changing_fdlimit);
83 }
84
85 /*
86 * find a spare slot in the fd list. We can optimise this out later!
87 * -- adrian
88 */
89 static inline int
90 poll_findslot(void)
91 {
92 int i;
93
94 for (i = 0; i < hard_fdlimit; i++)
95 if (pollfds[i].fd == -1)
96 {
97 /* MATCH!!#$*&$ */
98 return i;
99 }
100
101 assert(1 == 0);
102 /* NOTREACHED */
103 return -1;
104 }
105
106 /*
107 * comm_setselect
108 *
109 * This is a needed exported function which will be called to register
110 * and deregister interest in a pending IO state for a given FD.
111 */
112 void
113 comm_setselect(fde_t *F, unsigned int type, PF *handler,
114 void *client_data, time_t timeout)
115 {
116 int new_events;
117
118 if ((type & COMM_SELECT_READ))
119 {
120 F->read_handler = handler;
121 F->read_data = client_data;
122 }
123
124 if ((type & COMM_SELECT_WRITE))
125 {
126 F->write_handler = handler;
127 F->write_data = client_data;
128 }
129
130 new_events = (F->read_handler ? POLLRDNORM : 0) |
131 (F->write_handler ? POLLWRNORM : 0);
132
133 if (timeout != 0)
134 F->timeout = CurrentTime + (timeout / 1000);
135
136 if (new_events != F->evcache)
137 {
138 if (new_events == 0)
139 {
140 pollfds[F->comm_index].fd = -1;
141 pollfds[F->comm_index].revents = 0;
142
143 if (pollmax == F->comm_index)
144 while (pollmax >= 0 && pollfds[pollmax].fd == -1)
145 pollmax--;
146 }
147 else
148 {
149 if (F->evcache == 0)
150 {
151 F->comm_index = poll_findslot();
152 if (F->comm_index > pollmax)
153 pollmax = F->comm_index;
154
155 pollfds[F->comm_index].fd = F->fd;
156 }
157 pollfds[F->comm_index].events = new_events;
158 pollfds[F->comm_index].revents = 0;
159 }
160
161 F->evcache = new_events;
162 }
163 }
164
165 /*
166 * comm_select
167 *
168 * Called to do the new-style IO, courtesy of of squid (like most of this
169 * new IO code). This routine handles the stuff we've hidden in
170 * comm_setselect and fd_table[] and calls callbacks for IO ready
171 * events.
172 */
173 void
174 comm_select(void)
175 {
176 int num, ci, revents;
177 PF *hdl;
178 fde_t *F;
179
180 /* XXX kill that +1 later ! -- adrian */
181 num = poll(pollfds, pollmax + 1, SELECT_DELAY);
182
183 set_time();
184
185 if (num < 0)
186 {
187 #ifdef HAVE_USLEEP
188 usleep(50000); /* avoid 99% CPU in comm_select */
189 #endif
190 return;
191 }
192
193 for (ci = 0; ci <= pollmax && num > 0; ci++)
194 {
195 if ((revents = pollfds[ci].revents) == 0 || pollfds[ci].fd == -1)
196 continue;
197 num--;
198
199 F = lookup_fd(pollfds[ci].fd);
200 if (F == NULL || !F->flags.open)
201 continue;
202
203 if (revents & (POLLRDNORM | POLLIN | POLLHUP | POLLERR))
204 if ((hdl = F->read_handler) != NULL)
205 {
206 F->read_handler = NULL;
207 hdl(F, F->read_data);
208 if (!F->flags.open)
209 continue;
210 }
211
212 if (revents & (POLLWRNORM | POLLOUT | POLLHUP | POLLERR))
213 if ((hdl = F->write_handler) != NULL)
214 {
215 F->write_handler = NULL;
216 hdl(F, F->write_data);
217 if (!F->flags.open)
218 continue;
219 }
220
221 comm_setselect(F, 0, NULL, NULL, 0);
222 }
223 }
224 #endif

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