1 |
/* |
2 |
* ircd-hybrid: an advanced Internet Relay Chat Daemon(ircd). |
3 |
* s_bsd_select.c: select() 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 |
#include "fdlist.h" |
28 |
#include "hook.h" |
29 |
#include "ircd.h" |
30 |
#include "s_bsd.h" |
31 |
#include "s_log.h" |
32 |
|
33 |
/* |
34 |
* Note that this is only a single list - multiple lists is kinda pointless |
35 |
* under select because the list size is a function of the highest FD :-) |
36 |
* -- adrian |
37 |
*/ |
38 |
|
39 |
static fd_set select_readfds, tmpreadfds; |
40 |
static fd_set select_writefds, tmpwritefds; |
41 |
static int highest_fd = -1; |
42 |
static dlink_node *hookptr; |
43 |
|
44 |
/* |
45 |
* changing_fdlimit |
46 |
* |
47 |
* Make sure hard_fdlimit doesn't go too big. |
48 |
*/ |
49 |
static void * |
50 |
changing_fdlimit(va_list args) |
51 |
{ |
52 |
int fdmax = va_arg(args, int); |
53 |
|
54 |
if (fdmax > FD_SETSIZE) |
55 |
fdmax = FD_SETSIZE; |
56 |
|
57 |
return pass_callback(hookptr, fdmax); |
58 |
} |
59 |
|
60 |
/* |
61 |
* init_netio |
62 |
* |
63 |
* This is a needed exported function which will be called to initialise |
64 |
* the network loop code. |
65 |
*/ |
66 |
void |
67 |
init_netio(void) |
68 |
{ |
69 |
FD_ZERO(&select_readfds); |
70 |
FD_ZERO(&select_writefds); |
71 |
|
72 |
hookptr = install_hook(fdlimit_cb, changing_fdlimit); |
73 |
} |
74 |
|
75 |
/* |
76 |
* comm_setselect |
77 |
* |
78 |
* This is a needed exported function which will be called to register |
79 |
* and deregister interest in a pending IO state for a given FD. |
80 |
*/ |
81 |
void |
82 |
comm_setselect(fde_t *F, unsigned int type, PF *handler, |
83 |
void *client_data, time_t timeout) |
84 |
{ |
85 |
int new_events; |
86 |
|
87 |
if ((type & COMM_SELECT_READ)) |
88 |
{ |
89 |
F->read_handler = handler; |
90 |
F->read_data = client_data; |
91 |
} |
92 |
|
93 |
if ((type & COMM_SELECT_WRITE)) |
94 |
{ |
95 |
F->write_handler = handler; |
96 |
F->write_data = client_data; |
97 |
} |
98 |
|
99 |
new_events = (F->read_handler ? COMM_SELECT_READ : 0) | |
100 |
(F->write_handler ? COMM_SELECT_WRITE : 0); |
101 |
|
102 |
if (timeout != 0) |
103 |
F->timeout = CurrentTime + (timeout / 1000); |
104 |
|
105 |
if (new_events != F->evcache) |
106 |
{ |
107 |
if ((new_events & COMM_SELECT_READ)) |
108 |
FD_SET(F->fd, &select_readfds); |
109 |
else |
110 |
{ |
111 |
FD_CLR(F->fd, &select_readfds); |
112 |
FD_CLR(F->fd, &tmpreadfds); |
113 |
} |
114 |
|
115 |
if ((new_events & COMM_SELECT_WRITE)) |
116 |
FD_SET(F->fd, &select_writefds); |
117 |
else |
118 |
{ |
119 |
FD_CLR(F->fd, &select_writefds); |
120 |
FD_CLR(F->fd, &tmpwritefds); |
121 |
} |
122 |
|
123 |
if (new_events == 0) |
124 |
{ |
125 |
if (highest_fd == F->fd) |
126 |
while (highest_fd >= 0 && (FD_ISSET(highest_fd, &select_readfds) || |
127 |
FD_ISSET(highest_fd, &select_writefds))) |
128 |
highest_fd--; |
129 |
} |
130 |
else if (F->evcache == 0) |
131 |
if (F->fd > highest_fd) |
132 |
highest_fd = F->fd; |
133 |
|
134 |
F->evcache = new_events; |
135 |
} |
136 |
} |
137 |
|
138 |
/* |
139 |
* comm_select |
140 |
* |
141 |
* Called to do the new-style IO, courtesy of squid (like most of this |
142 |
* new IO code). This routine handles the stuff we've hidden in |
143 |
* comm_setselect and fd_table[] and calls callbacks for IO ready |
144 |
* events. |
145 |
*/ |
146 |
void |
147 |
comm_select(void) |
148 |
{ |
149 |
struct timeval to; |
150 |
int num, fd; |
151 |
fde_t *F; |
152 |
PF *hdl; |
153 |
|
154 |
/* Copy over the read/write sets so we don't have to rebuild em */ |
155 |
memcpy(&tmpreadfds, &select_readfds, sizeof(fd_set)); |
156 |
memcpy(&tmpwritefds, &select_writefds, sizeof(fd_set)); |
157 |
|
158 |
to.tv_sec = 0; |
159 |
to.tv_usec = SELECT_DELAY * 1000; |
160 |
num = select(highest_fd + 1, &tmpreadfds, &tmpwritefds, NULL, &to); |
161 |
|
162 |
set_time(); |
163 |
|
164 |
if (num < 0) |
165 |
{ |
166 |
#ifdef HAVE_USLEEP |
167 |
usleep(50000); |
168 |
#endif |
169 |
return; |
170 |
} |
171 |
|
172 |
for (fd = 0; fd <= highest_fd && num > 0; fd++) |
173 |
if (FD_ISSET(fd, &tmpreadfds) || FD_ISSET(fd, &tmpwritefds)) |
174 |
{ |
175 |
num--; |
176 |
|
177 |
F = lookup_fd(fd); |
178 |
if (F == NULL || !F->flags.open) |
179 |
continue; |
180 |
|
181 |
if (FD_ISSET(fd, &tmpreadfds)) |
182 |
if ((hdl = F->read_handler) != NULL) |
183 |
{ |
184 |
F->read_handler = NULL; |
185 |
hdl(F, F->read_data); |
186 |
if (!F->flags.open) |
187 |
continue; |
188 |
} |
189 |
|
190 |
if (FD_ISSET(fd, &tmpwritefds)) |
191 |
if ((hdl = F->write_handler) != NULL) |
192 |
{ |
193 |
F->write_handler = NULL; |
194 |
hdl(F, F->write_data); |
195 |
if (!F->flags.open) |
196 |
continue; |
197 |
} |
198 |
|
199 |
comm_setselect(F, 0, NULL, NULL, 0); |
200 |
} |
201 |
} |