/[svn]/ircd-hybrid-8/src/fdlist.c
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Contents of /ircd-hybrid-8/src/fdlist.c

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Revision 1312 - (show annotations)
Mon Mar 26 16:07:20 2012 UTC (8 years, 4 months ago) by michael
File MIME type: text/x-chdr
File size: 5453 byte(s)
- client.h: remove servlink leftovers

1 /*
2 * ircd-hybrid: an advanced Internet Relay Chat Daemon(ircd).
3 * fdlist.c: Maintains a list of file descriptors.
4 *
5 * Copyright (C) 2002 by the past and present ircd coders, and others.
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
20 * USA
21 *
22 * $Id$
23 */
24
25 #include "stdinc.h"
26 #include "fdlist.h"
27 #include "client.h" /* struct Client */
28 #include "event.h"
29 #include "ircd.h" /* GlobalSetOptions */
30 #include "irc_string.h"
31 #include "s_bsd.h" /* comm_setselect */
32 #include "conf.h" /* ServerInfo */
33 #include "send.h"
34 #include "memory.h"
35 #include "numeric.h"
36 #include "s_misc.h"
37 #include "irc_res.h"
38
39 fde_t *fd_hash[FD_HASH_SIZE];
40 fde_t *fd_next_in_loop = NULL;
41 int number_fd = LEAKED_FDS;
42 int hard_fdlimit = 0;
43 struct Callback *fdlimit_cb = NULL;
44
45 static void *
46 changing_fdlimit(va_list args)
47 {
48 int old_fdlimit = hard_fdlimit;
49
50 hard_fdlimit = va_arg(args, int);
51
52 if (ServerInfo.max_clients > MAXCLIENTS_MAX)
53 {
54 if (old_fdlimit != 0)
55 sendto_realops_flags(UMODE_ALL, L_ALL,
56 "HARD_FDLIMIT changed to %d, adjusting MAXCLIENTS to %d",
57 hard_fdlimit, MAXCLIENTS_MAX);
58
59 ServerInfo.max_clients = MAXCLIENTS_MAX;
60 }
61
62 return NULL;
63 }
64
65 void
66 fdlist_init(void)
67 {
68 memset(&fd_hash, 0, sizeof(fd_hash));
69
70 fdlimit_cb = register_callback("changing_fdlimit", changing_fdlimit);
71 eventAddIsh("recalc_fdlimit", recalc_fdlimit, NULL, 58);
72 recalc_fdlimit(NULL);
73 }
74
75 void
76 recalc_fdlimit(void *unused)
77 {
78 int fdmax;
79 struct rlimit limit;
80
81 if (!getrlimit(RLIMIT_NOFILE, &limit))
82 {
83 limit.rlim_cur = limit.rlim_max;
84 setrlimit(RLIMIT_NOFILE, &limit);
85 }
86
87 fdmax = getdtablesize();
88
89 /* allow MAXCLIENTS_MIN clients even at the cost of MAX_BUFFER and
90 * some not really LEAKED_FDS */
91 fdmax = IRCD_MAX(fdmax, LEAKED_FDS + MAX_BUFFER + MAXCLIENTS_MIN);
92
93 /* under no condition shall this raise over 65536
94 * for example user ip heap is sized 2*hard_fdlimit */
95 fdmax = IRCD_MIN(fdmax, 65536);
96
97 if (fdmax != hard_fdlimit)
98 execute_callback(fdlimit_cb, fdmax);
99 }
100
101 static inline unsigned int
102 hash_fd(int fd)
103 {
104 return (((unsigned) fd) % FD_HASH_SIZE);
105 }
106
107 fde_t *
108 lookup_fd(int fd)
109 {
110 fde_t *F = fd_hash[hash_fd(fd)];
111
112 while (F)
113 {
114 if (F->fd == fd)
115 return (F);
116 F = F->hnext;
117 }
118
119 return (NULL);
120 }
121
122 /* Called to open a given filedescriptor */
123 void
124 fd_open(fde_t *F, int fd, int is_socket, const char *desc)
125 {
126 unsigned int hashv = hash_fd(fd);
127 assert(fd >= 0);
128
129 F->fd = fd;
130 F->comm_index = -1;
131 if (desc)
132 strlcpy(F->desc, desc, sizeof(F->desc));
133 /* Note: normally we'd have to clear the other flags,
134 * but currently F is always cleared before calling us.. */
135 F->flags.open = 1;
136 F->flags.is_socket = is_socket;
137 F->hnext = fd_hash[hashv];
138 fd_hash[hashv] = F;
139
140 number_fd++;
141 }
142
143 /* Called to close a given filedescriptor */
144 void
145 fd_close(fde_t *F)
146 {
147 unsigned int hashv = hash_fd(F->fd);
148
149 if (F == fd_next_in_loop)
150 fd_next_in_loop = F->hnext;
151
152 if (F->flags.is_socket)
153 comm_setselect(F, COMM_SELECT_WRITE | COMM_SELECT_READ, NULL, NULL, 0);
154
155 delete_resolver_queries(F);
156
157 #ifdef HAVE_LIBCRYPTO
158 if (F->ssl)
159 SSL_free(F->ssl);
160 #endif
161
162 if (fd_hash[hashv] == F)
163 fd_hash[hashv] = F->hnext;
164 else {
165 fde_t *prev;
166
167 /* let it core if not found */
168 for (prev = fd_hash[hashv]; prev->hnext != F; prev = prev->hnext)
169 ;
170 prev->hnext = F->hnext;
171 }
172
173 /* Unlike squid, we're actually closing the FD here! -- adrian */
174 close(F->fd);
175 number_fd--;
176
177 memset(F, 0, sizeof(fde_t));
178 }
179
180 /*
181 * fd_dump() - dump the list of active filedescriptors
182 */
183 void
184 fd_dump(struct Client *source_p)
185 {
186 int i;
187 fde_t *F;
188
189 for (i = 0; i < FD_HASH_SIZE; i++)
190 for (F = fd_hash[i]; F != NULL; F = F->hnext)
191 sendto_one(source_p, ":%s %d %s :fd %-5d desc '%s'",
192 me.name, RPL_STATSDEBUG, source_p->name,
193 F->fd, F->desc);
194 }
195
196 /*
197 * fd_note() - set the fd note
198 *
199 * Note: must be careful not to overflow fd_table[fd].desc when
200 * calling.
201 */
202 void
203 fd_note(fde_t *F, const char *format, ...)
204 {
205 va_list args;
206
207 if (format != NULL)
208 {
209 va_start(args, format);
210 vsnprintf(F->desc, sizeof(F->desc), format, args);
211 va_end(args);
212 }
213 else
214 F->desc[0] = '\0';
215 }
216
217 /* Make sure stdio descriptors (0-2) and profiler descriptor (3)
218 * always go somewhere harmless. Use -foreground for profiling
219 * or executing from gdb */
220 void
221 close_standard_fds(void)
222 {
223 int i;
224
225 for (i = 0; i < LOWEST_SAFE_FD; i++)
226 {
227 close(i);
228 if (open(PATH_DEVNULL, O_RDWR) < 0)
229 exit(-1); /* we're hosed if we can't even open /dev/null */
230 }
231 }
232
233 void
234 close_fds(fde_t *one)
235 {
236 int i;
237 fde_t *F;
238
239 for (i = 0; i < FD_HASH_SIZE; i++)
240 for (F = fd_hash[i]; F != NULL; F = F->hnext)
241 if (F != one)
242 close(F->fd);
243 }

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