/[svn]/ircd-hybrid/src/s_bsd_kqueue.c
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Annotation of /ircd-hybrid/src/s_bsd_kqueue.c

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Revision 30 - (hide annotations)
Sun Oct 2 20:03:27 2005 UTC (17 years, 1 month ago) by adx
File MIME type: text/x-chdr
File size: 4989 byte(s)
- imported sources
- can be moved later according to the directory/branching scheme,
  but we need the svn up

1 adx 30 /*
2     * ircd-hybrid: an advanced Internet Relay Chat Daemon(ircd).
3     * s_bsd_kqueue.c: FreeBSD kqueue compatible network routines.
4     *
5     * Originally by Adrian Chadd <adrian@creative.net.au>
6     * Copyright (C) 2005 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: s_bsd_kqueue.c,v 1.45 2005/09/29 06:35:41 metalrock Exp $
24     */
25    
26     #include "stdinc.h"
27     #include <sys/event.h>
28     #include "fdlist.h"
29     #include "ircd.h"
30     #include "memory.h"
31     #include "s_bsd.h"
32     #include "s_log.h"
33    
34     #define KE_LENGTH 128
35    
36     /* jlemon goofed up and didn't add EV_SET until fbsd 4.3 */
37    
38     #ifndef EV_SET
39     #define EV_SET(kevp, a, b, c, d, e, f) do { \
40     (kevp)->ident = (a); \
41     (kevp)->filter = (b); \
42     (kevp)->flags = (c); \
43     (kevp)->fflags = (d); \
44     (kevp)->data = (e); \
45     (kevp)->udata = (f); \
46     } while(0)
47     #endif
48    
49     static fde_t kqfd;
50     static struct kevent kq_fdlist[KE_LENGTH]; /* kevent buffer */
51     static int kqoff; /* offset into the buffer */
52     void init_netio(void);
53    
54     /*
55     * init_netio
56     *
57     * This is a needed exported function which will be called to initialise
58     * the network loop code.
59     */
60     void
61     init_netio(void)
62     {
63     int fd;
64    
65     if ((fd = kqueue()) < 0)
66     {
67     ilog(L_CRIT, "init_netio: Couldn't open kqueue fd!");
68     exit(115); /* Whee! */
69     }
70    
71     fd_open(&kqfd, fd, 0, "kqueue() file descriptor");
72     }
73    
74     /*
75     * Write a single update to the kqueue list.
76     */
77     static void
78     kq_update_events(int fd, int filter, int what)
79     {
80     static struct timespec zero_timespec = {0, 0};
81     struct kevent *kep = kq_fdlist + kqoff;
82    
83     EV_SET(kep, (uintptr_t) fd, (short) filter, what, 0, 0, NULL);
84    
85     if (kqoff == KE_LENGTH)
86     {
87     kevent(kqfd.fd, kq_fdlist, kqoff, NULL, 0, &zero_timespec);
88     kqoff = 0;
89     }
90     else
91     kqoff++;
92     }
93    
94     /*
95     * comm_setselect
96     *
97     * This is a needed exported function which will be called to register
98     * and deregister interest in a pending IO state for a given FD.
99     */
100     void
101     comm_setselect(fde_t *F, unsigned int type, PF *handler,
102     void *client_data, time_t timeout)
103     {
104     int new_events, diff;
105    
106     if ((type & COMM_SELECT_READ))
107     {
108     F->read_handler = handler;
109     F->read_data = client_data;
110     }
111    
112     if ((type & COMM_SELECT_WRITE))
113     {
114     F->write_handler = handler;
115     F->write_data = client_data;
116     }
117    
118     new_events = (F->read_handler ? COMM_SELECT_READ : 0) |
119     (F->write_handler ? COMM_SELECT_WRITE : 0);
120    
121     if (timeout != 0)
122     F->timeout = CurrentTime + (timeout / 1000);
123    
124     diff = new_events ^ F->evcache;
125    
126     if ((diff & COMM_SELECT_READ))
127     kq_update_events(F->fd, EVFILT_READ,
128     (new_events & COMM_SELECT_READ) ? EV_ADD : EV_DELETE);
129     if ((diff & COMM_SELECT_WRITE))
130     kq_update_events(F->fd, EVFILT_WRITE,
131     (new_events & COMM_SELECT_WRITE) ? EV_ADD : EV_DELETE);
132    
133     F->evcache = new_events;
134     }
135    
136     /*
137     * comm_select
138     *
139     * Called to do the new-style IO, courtesy of squid (like most of this
140     * new IO code). This routine handles the stuff we've hidden in
141     * comm_setselect and fd_table[] and calls callbacks for IO ready
142     * events.
143     */
144     void
145     comm_select(void)
146     {
147     int num, i;
148     static struct kevent ke[KE_LENGTH];
149     struct timespec poll_time;
150     PF *hdl;
151     fde_t *F;
152    
153     /*
154     * remember we are doing NANOseconds here, not micro/milli. God knows
155     * why jlemon used a timespec, but hey, he wrote the interface, not I
156     * -- Adrian
157     */
158     poll_time.tv_sec = 0;
159     poll_time.tv_nsec = SELECT_DELAY * 1000000;
160     num = kevent(kqfd.fd, kq_fdlist, kqoff, ke, KE_LENGTH, &poll_time);
161     kqoff = 0;
162    
163     set_time();
164    
165     if (num < 0)
166     {
167     #ifdef HAVE_USLEEP
168     usleep(50000); /* avoid 99% CPU in comm_select */
169     #endif
170     return;
171     }
172    
173     for (i = 0; i < num; i++)
174     {
175     F = lookup_fd(ke[i].ident);
176     if (F == NULL || !F->flags.open || (ke[i].flags & EV_ERROR))
177     continue;
178    
179     if (ke[i].filter == EVFILT_READ)
180     if ((hdl = F->read_handler) != NULL)
181     {
182     F->read_handler = NULL;
183     hdl(F, F->read_data);
184     if (!F->flags.open)
185     continue;
186     }
187    
188     if (ke[i].filter == EVFILT_WRITE)
189     if ((hdl = F->write_handler) != NULL)
190     {
191     F->write_handler = NULL;
192     hdl(F, F->write_data);
193     if (!F->flags.open)
194     continue;
195     }
196    
197     comm_setselect(F, 0, NULL, NULL, 0);
198     }
199     }

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