| 1 |
/* |
| 2 |
* ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd) |
| 3 |
* |
| 4 |
* Copyright (c) 2005-2014 ircd-hybrid development team |
| 5 |
* |
| 6 |
* This program is free software; you can redistribute it and/or modify |
| 7 |
* it under the terms of the GNU General Public License as published by |
| 8 |
* the Free Software Foundation; either version 2 of the License, or |
| 9 |
* (at your option) any later version. |
| 10 |
* |
| 11 |
* This program is distributed in the hope that it will be useful, |
| 12 |
* but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 |
* GNU General Public License for more details. |
| 15 |
* |
| 16 |
* You should have received a copy of the GNU General Public License |
| 17 |
* along with this program; if not, write to the Free Software |
| 18 |
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 |
| 19 |
* USA |
| 20 |
*/ |
| 21 |
|
| 22 |
/*! \file s_bsd_epoll.c |
| 23 |
* \brief Linux epoll() compatible network routines. |
| 24 |
* \version $Id$ |
| 25 |
*/ |
| 26 |
|
| 27 |
#include "stdinc.h" |
| 28 |
#if USE_IOPOLL_MECHANISM == __IOPOLL_MECHANISM_EPOLL |
| 29 |
#include "fdlist.h" |
| 30 |
#include "ircd.h" |
| 31 |
#include "memory.h" |
| 32 |
#include "s_bsd.h" |
| 33 |
#include "log.h" |
| 34 |
#include <sys/epoll.h> |
| 35 |
#include <sys/syscall.h> |
| 36 |
|
| 37 |
static fde_t efd; |
| 38 |
|
| 39 |
/* Thanks to ircu for the following ifdefs. */ |
| 40 |
|
| 41 |
/* The GNU C library may have a valid header but stub implementations |
| 42 |
* of the epoll system calls. If so, provide our own. */ |
| 43 |
#if defined(__stub_epoll_create) || defined(__stub___epoll_create) || defined(EPOLL_NEED_BODY) |
| 44 |
|
| 45 |
/* Oh, did we mention that some glibc releases do not even define the |
| 46 |
* syscall numbers? */ |
| 47 |
#if !defined(__NR_epoll_create) |
| 48 |
#if defined(__ia64__) |
| 49 |
#define __NR_epoll_create 1243 |
| 50 |
#define __NR_epoll_ctl 1244 |
| 51 |
#define __NR_epoll_wait 1245 |
| 52 |
#elif defined(__x86_64__) |
| 53 |
#define __NR_epoll_create 214 |
| 54 |
#define __NR_epoll_ctl 233 |
| 55 |
#define __NR_epoll_wait 232 |
| 56 |
#elif defined(__sparc64__) || defined(__sparc__) |
| 57 |
#define __NR_epoll_create 193 |
| 58 |
#define __NR_epoll_ctl 194 |
| 59 |
#define __NR_epoll_wait 195 |
| 60 |
#elif defined(__s390__) || defined(__m68k__) |
| 61 |
#define __NR_epoll_create 249 |
| 62 |
#define __NR_epoll_ctl 250 |
| 63 |
#define __NR_epoll_wait 251 |
| 64 |
#elif defined(__ppc64__) || defined(__ppc__) |
| 65 |
#define __NR_epoll_create 236 |
| 66 |
#define __NR_epoll_ctl 237 |
| 67 |
#define __NR_epoll_wait 238 |
| 68 |
#elif defined(__parisc__) || defined(__arm26__) || defined(__arm__) |
| 69 |
#define __NR_epoll_create 224 |
| 70 |
#define __NR_epoll_ctl 225 |
| 71 |
#define __NR_epoll_wait 226 |
| 72 |
#elif defined(__alpha__) |
| 73 |
#define __NR_epoll_create 407 |
| 74 |
#define __NR_epoll_ctl 408 |
| 75 |
#define __NR_epoll_wait 409 |
| 76 |
#elif defined(__sh64__) |
| 77 |
#define __NR_epoll_create 282 |
| 78 |
#define __NR_epoll_ctl 283 |
| 79 |
#define __NR_epoll_wait 284 |
| 80 |
#elif defined(__i386__) || defined(__sh__) || defined(__m32r__) || defined(__h8300__) || defined(__frv__) |
| 81 |
#define __NR_epoll_create 254 |
| 82 |
#define __NR_epoll_ctl 255 |
| 83 |
#define __NR_epoll_wait 256 |
| 84 |
#else /* cpu types */ |
| 85 |
#error No system call numbers defined for epoll family. |
| 86 |
#endif /* cpu types */ |
| 87 |
#endif /* !defined(__NR_epoll_create) */ |
| 88 |
|
| 89 |
_syscall1(int, epoll_create, int, size) |
| 90 |
_syscall4(int, epoll_ctl, int, epfd, int, op, int, fd, struct epoll_event *, event) |
| 91 |
_syscall4(int, epoll_wait, int, epfd, struct epoll_event *, pevents, int, maxevents, int, timeout) |
| 92 |
|
| 93 |
#endif /* epoll_create defined as stub */ |
| 94 |
|
| 95 |
/* |
| 96 |
* init_netio |
| 97 |
* |
| 98 |
* This is a needed exported function which will be called to initialise |
| 99 |
* the network loop code. |
| 100 |
*/ |
| 101 |
void |
| 102 |
init_netio(void) |
| 103 |
{ |
| 104 |
int fd; |
| 105 |
|
| 106 |
if ((fd = epoll_create(hard_fdlimit)) < 0) |
| 107 |
{ |
| 108 |
ilog(LOG_TYPE_IRCD, "init_netio: Couldn't open epoll fd - %d: %s", |
| 109 |
errno, strerror(errno)); |
| 110 |
exit(115); /* Whee! */ |
| 111 |
} |
| 112 |
|
| 113 |
fd_open(&efd, fd, 0, "epoll file descriptor"); |
| 114 |
} |
| 115 |
|
| 116 |
/* |
| 117 |
* comm_setselect |
| 118 |
* |
| 119 |
* This is a needed exported function which will be called to register |
| 120 |
* and deregister interest in a pending IO state for a given FD. |
| 121 |
*/ |
| 122 |
void |
| 123 |
comm_setselect(fde_t *F, unsigned int type, PF *handler, |
| 124 |
void *client_data, time_t timeout) |
| 125 |
{ |
| 126 |
int new_events, op; |
| 127 |
struct epoll_event ep_event = { 0, { 0 } }; |
| 128 |
|
| 129 |
if ((type & COMM_SELECT_READ)) |
| 130 |
{ |
| 131 |
F->read_handler = handler; |
| 132 |
F->read_data = client_data; |
| 133 |
} |
| 134 |
|
| 135 |
if ((type & COMM_SELECT_WRITE)) |
| 136 |
{ |
| 137 |
F->write_handler = handler; |
| 138 |
F->write_data = client_data; |
| 139 |
} |
| 140 |
|
| 141 |
new_events = (F->read_handler ? EPOLLIN : 0) | |
| 142 |
(F->write_handler ? EPOLLOUT : 0); |
| 143 |
|
| 144 |
if (timeout != 0) |
| 145 |
{ |
| 146 |
F->timeout = CurrentTime + (timeout / 1000); |
| 147 |
F->timeout_handler = handler; |
| 148 |
F->timeout_data = client_data; |
| 149 |
} |
| 150 |
|
| 151 |
if (new_events != F->evcache) |
| 152 |
{ |
| 153 |
if (new_events == 0) |
| 154 |
op = EPOLL_CTL_DEL; |
| 155 |
else if (F->evcache == 0) |
| 156 |
op = EPOLL_CTL_ADD; |
| 157 |
else |
| 158 |
op = EPOLL_CTL_MOD; |
| 159 |
|
| 160 |
ep_event.events = F->evcache = new_events; |
| 161 |
ep_event.data.fd = F->fd; |
| 162 |
|
| 163 |
if (epoll_ctl(efd.fd, op, F->fd, &ep_event) != 0) |
| 164 |
{ |
| 165 |
ilog(LOG_TYPE_IRCD, "comm_setselect: epoll_ctl() failed: %s", strerror(errno)); |
| 166 |
abort(); |
| 167 |
} |
| 168 |
} |
| 169 |
} |
| 170 |
|
| 171 |
/* |
| 172 |
* comm_select() |
| 173 |
* |
| 174 |
* Called to do the new-style IO, courtesy of of squid (like most of this |
| 175 |
* new IO code). This routine handles the stuff we've hidden in |
| 176 |
* comm_setselect and fd_table[] and calls callbacks for IO ready |
| 177 |
* events. |
| 178 |
*/ |
| 179 |
void |
| 180 |
comm_select(void) |
| 181 |
{ |
| 182 |
struct epoll_event ep_fdlist[128]; |
| 183 |
int num, i; |
| 184 |
PF *hdl; |
| 185 |
fde_t *F; |
| 186 |
|
| 187 |
num = epoll_wait(efd.fd, ep_fdlist, 128, SELECT_DELAY); |
| 188 |
|
| 189 |
set_time(); |
| 190 |
|
| 191 |
if (num < 0) |
| 192 |
{ |
| 193 |
#ifdef HAVE_USLEEP |
| 194 |
usleep(50000); /* avoid 99% CPU in comm_select */ |
| 195 |
#endif |
| 196 |
return; |
| 197 |
} |
| 198 |
|
| 199 |
for (i = 0; i < num; i++) |
| 200 |
{ |
| 201 |
F = lookup_fd(ep_fdlist[i].data.fd); |
| 202 |
if (F == NULL || !F->flags.open) |
| 203 |
continue; |
| 204 |
|
| 205 |
if ((ep_fdlist[i].events & (EPOLLIN | EPOLLHUP | EPOLLERR))) |
| 206 |
{ |
| 207 |
if ((hdl = F->read_handler) != NULL) |
| 208 |
{ |
| 209 |
F->read_handler = NULL; |
| 210 |
hdl(F, F->read_data); |
| 211 |
if (!F->flags.open) |
| 212 |
continue; |
| 213 |
} |
| 214 |
} |
| 215 |
|
| 216 |
if ((ep_fdlist[i].events & (EPOLLOUT | EPOLLHUP | EPOLLERR))) |
| 217 |
{ |
| 218 |
if ((hdl = F->write_handler) != NULL) |
| 219 |
{ |
| 220 |
F->write_handler = NULL; |
| 221 |
hdl(F, F->write_data); |
| 222 |
if (!F->flags.open) |
| 223 |
continue; |
| 224 |
} |
| 225 |
} |
| 226 |
|
| 227 |
comm_setselect(F, 0, NULL, NULL, 0); |
| 228 |
} |
| 229 |
} |
| 230 |
#endif |
