/[svn]/ircd-hybrid-7.2/src/s_bsd_epoll.c
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Annotation of /ircd-hybrid-7.2/src/s_bsd_epoll.c

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Revision 908 - (hide annotations)
Sun Nov 4 23:21:51 2007 UTC (13 years, 5 months ago) by stu
File MIME type: text/x-chdr
File size: 5895 byte(s)
Completely redo the build system.  Now uses libtool and automake.  Suggest you clean out your tree and then do ./autogen.sh.
1 adx 30 /*
2     * ircd-hybrid: an advanced Internet Relay Chat Daemon(ircd).
3     * s_bsd_epoll.c: Linux epoll() compatible network routines.
4     *
5     * Copyright (C) 2002-2005 Hybrid Development Team
6     * Based also on work of Adrian Chadd, Aaron Sethman and others.
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 knight 31 * $Id$
24 adx 30 */
25    
26     #include "stdinc.h"
27 stu 908 #if USE_IOPOLL_MECHANISM == __IOPOLL_MECHANISM_EPOLL
28 adx 30 #include "fdlist.h"
29     #include "ircd.h"
30     #include "memory.h"
31     #include "s_bsd.h"
32     #include "s_log.h"
33     #include <sys/epoll.h>
34     #include <sys/syscall.h>
35    
36     static fde_t efd;
37    
38     /* Thanks to ircu for the following ifdefs. */
39    
40     /* The GNU C library may have a valid header but stub implementations
41     * of the epoll system calls. If so, provide our own. */
42     #if defined(__stub_epoll_create) || defined(__stub___epoll_create) || defined(EPOLL_NEED_BODY)
43    
44     /* Oh, did we mention that some glibc releases do not even define the
45     * syscall numbers? */
46     #if !defined(__NR_epoll_create)
47     #if defined(__ia64__)
48     #define __NR_epoll_create 1243
49     #define __NR_epoll_ctl 1244
50     #define __NR_epoll_wait 1245
51     #elif defined(__x86_64__)
52     #define __NR_epoll_create 214
53     #define __NR_epoll_ctl 233
54     #define __NR_epoll_wait 232
55     #elif defined(__sparc64__) || defined(__sparc__)
56     #define __NR_epoll_create 193
57     #define __NR_epoll_ctl 194
58     #define __NR_epoll_wait 195
59     #elif defined(__s390__) || defined(__m68k__)
60     #define __NR_epoll_create 249
61     #define __NR_epoll_ctl 250
62     #define __NR_epoll_wait 251
63     #elif defined(__ppc64__) || defined(__ppc__)
64     #define __NR_epoll_create 236
65     #define __NR_epoll_ctl 237
66     #define __NR_epoll_wait 238
67     #elif defined(__parisc__) || defined(__arm26__) || defined(__arm__)
68     #define __NR_epoll_create 224
69     #define __NR_epoll_ctl 225
70     #define __NR_epoll_wait 226
71     #elif defined(__alpha__)
72     #define __NR_epoll_create 407
73     #define __NR_epoll_ctl 408
74     #define __NR_epoll_wait 409
75     #elif defined(__sh64__)
76     #define __NR_epoll_create 282
77     #define __NR_epoll_ctl 283
78     #define __NR_epoll_wait 284
79     #elif defined(__i386__) || defined(__sh__) || defined(__m32r__) || defined(__h8300__) || defined(__frv__)
80     #define __NR_epoll_create 254
81     #define __NR_epoll_ctl 255
82     #define __NR_epoll_wait 256
83     #else /* cpu types */
84     #error No system call numbers defined for epoll family.
85     #endif /* cpu types */
86     #endif /* !defined(__NR_epoll_create) */
87    
88     _syscall1(int, epoll_create, int, size)
89     _syscall4(int, epoll_ctl, int, epfd, int, op, int, fd, struct epoll_event *, event)
90     _syscall4(int, epoll_wait, int, epfd, struct epoll_event *, pevents, int, maxevents, int, timeout)
91    
92     #endif /* epoll_create defined as stub */
93    
94     /*
95     * init_netio
96     *
97     * This is a needed exported function which will be called to initialise
98     * the network loop code.
99     */
100     void
101     init_netio(void)
102     {
103     int fd;
104    
105     if ((fd = epoll_create(hard_fdlimit)) < 0)
106     {
107     ilog(L_CRIT, "init_netio: Couldn't open epoll fd - %d: %s",
108     errno, strerror(errno));
109     exit(115); /* Whee! */
110     }
111    
112     fd_open(&efd, fd, 0, "epoll file descriptor");
113     }
114    
115     /*
116     * comm_setselect
117     *
118     * This is a needed exported function which will be called to register
119     * and deregister interest in a pending IO state for a given FD.
120     */
121     void
122     comm_setselect(fde_t *F, unsigned int type, PF *handler,
123     void *client_data, time_t timeout)
124     {
125     int new_events, op;
126     struct epoll_event ep_event;
127    
128     if ((type & COMM_SELECT_READ))
129     {
130     F->read_handler = handler;
131     F->read_data = client_data;
132     }
133    
134     if ((type & COMM_SELECT_WRITE))
135     {
136     F->write_handler = handler;
137     F->write_data = client_data;
138     }
139    
140     new_events = (F->read_handler ? EPOLLIN : 0) |
141     (F->write_handler ? EPOLLOUT : 0);
142    
143     if (timeout != 0)
144     F->timeout = CurrentTime + (timeout / 1000);
145    
146     if (new_events != F->evcache)
147     {
148     if (new_events == 0)
149     op = EPOLL_CTL_DEL;
150     else if (F->evcache == 0)
151     op = EPOLL_CTL_ADD;
152     else
153     op = EPOLL_CTL_MOD;
154    
155     ep_event.events = F->evcache = new_events;
156     ep_event.data.fd = F->fd;
157    
158     if (epoll_ctl(efd.fd, op, F->fd, &ep_event) != 0)
159     {
160     ilog(L_CRIT, "comm_setselect: epoll_ctl() failed: %s", strerror(errno));
161     abort();
162     }
163     }
164     }
165    
166     /*
167     * comm_select()
168     *
169     * Called to do the new-style IO, courtesy of of squid (like most of this
170     * new IO code). This routine handles the stuff we've hidden in
171     * comm_setselect and fd_table[] and calls callbacks for IO ready
172     * events.
173     */
174     void
175     comm_select(void)
176     {
177     struct epoll_event ep_fdlist[128];
178     int num, i;
179     PF *hdl;
180     fde_t *F;
181    
182     num = epoll_wait(efd.fd, ep_fdlist, 128, SELECT_DELAY);
183    
184     set_time();
185    
186     if (num < 0)
187     {
188     #ifdef HAVE_USLEEP
189     usleep(50000); /* avoid 99% CPU in comm_select */
190     #endif
191     return;
192     }
193    
194     for (i = 0; i < num; i++)
195     {
196     F = lookup_fd(ep_fdlist[i].data.fd);
197     if (F == NULL || !F->flags.open)
198     continue;
199    
200     if ((ep_fdlist[i].events & (EPOLLIN | EPOLLHUP | EPOLLERR)))
201     if ((hdl = F->read_handler) != NULL)
202     {
203     F->read_handler = NULL;
204     hdl(F, F->read_data);
205     if (!F->flags.open)
206     continue;
207     }
208    
209     if ((ep_fdlist[i].events & (EPOLLOUT | EPOLLHUP | EPOLLERR)))
210     if ((hdl = F->write_handler) != NULL)
211     {
212     F->write_handler = NULL;
213     hdl(F, F->write_data);
214     if (!F->flags.open)
215     continue;
216     }
217    
218     comm_setselect(F, 0, NULL, NULL, 0);
219     }
220     }
221 stu 908 #endif

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