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root/svn/ircd-hybrid-8/src/fdlist.c
Revision: 1236
Committed: Thu Sep 29 11:21:27 2011 UTC (12 years, 6 months ago) by michael
Content type: text/x-csrc
File size: 5433 byte(s)
Log Message:
- Getting rid of rlimits.h. Relying on RLIMIT_NOFILE is
  more than enough nowadays

File Contents

# Content
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 #include "stdinc.h"
25 #include "fdlist.h"
26 #include "client.h" /* struct Client */
27 #include "common.h"
28 #include "event.h"
29 #include "ircd.h" /* GlobalSetOptions */
30 #include "irc_string.h"
31 #include "s_bsd.h" /* comm_setselect */
32 #include "s_conf.h" /* ServerInfo */
33 #include "send.h"
34 #include "memory.h"
35 #include "numeric.h"
36
37 fde_t *fd_hash[FD_HASH_SIZE];
38 fde_t *fd_next_in_loop = NULL;
39 int number_fd = LEAKED_FDS;
40 int hard_fdlimit = 0;
41 struct Callback *fdlimit_cb = NULL;
42
43 static void *
44 changing_fdlimit(va_list args)
45 {
46 int old_fdlimit = hard_fdlimit;
47
48 hard_fdlimit = va_arg(args, int);
49
50 if (ServerInfo.max_clients > MAXCLIENTS_MAX)
51 {
52 if (old_fdlimit != 0)
53 sendto_realops_flags(UMODE_ALL, L_ALL,
54 "HARD_FDLIMIT changed to %d, adjusting MAXCLIENTS to %d",
55 hard_fdlimit, MAXCLIENTS_MAX);
56
57 ServerInfo.max_clients = MAXCLIENTS_MAX;
58 }
59
60 return NULL;
61 }
62
63 void
64 fdlist_init(void)
65 {
66 memset(&fd_hash, 0, sizeof(fd_hash));
67
68 fdlimit_cb = register_callback("changing_fdlimit", changing_fdlimit);
69 eventAddIsh("recalc_fdlimit", recalc_fdlimit, NULL, 58);
70 recalc_fdlimit(NULL);
71 }
72
73 void
74 recalc_fdlimit(void *unused)
75 {
76 int fdmax;
77 struct rlimit limit;
78
79 if (!getrlimit(RLIMIT_NOFILE, &limit))
80 {
81 limit.rlim_cur = limit.rlim_max;
82 setrlimit(RLIMIT_NOFILE, &limit);
83 }
84
85 fdmax = getdtablesize();
86
87 /* allow MAXCLIENTS_MIN clients even at the cost of MAX_BUFFER and
88 * some not really LEAKED_FDS */
89 fdmax = IRCD_MAX(fdmax, LEAKED_FDS + MAX_BUFFER + MAXCLIENTS_MIN);
90
91 /* under no condition shall this raise over 65536
92 * for example user ip heap is sized 2*hard_fdlimit */
93 fdmax = IRCD_MIN(fdmax, 65536);
94
95 if (fdmax != hard_fdlimit)
96 execute_callback(fdlimit_cb, fdmax);
97 }
98
99 static inline unsigned int
100 hash_fd(int fd)
101 {
102 return (((unsigned) fd) % FD_HASH_SIZE);
103 }
104
105 fde_t *
106 lookup_fd(int fd)
107 {
108 fde_t *F = fd_hash[hash_fd(fd)];
109
110 while (F)
111 {
112 if (F->fd == fd)
113 return (F);
114 F = F->hnext;
115 }
116
117 return (NULL);
118 }
119
120 /* Called to open a given filedescriptor */
121 void
122 fd_open(fde_t *F, int fd, int is_socket, const char *desc)
123 {
124 unsigned int hashv = hash_fd(fd);
125 assert(fd >= 0);
126
127 F->fd = fd;
128 F->comm_index = -1;
129 if (desc)
130 strlcpy(F->desc, desc, sizeof(F->desc));
131 /* Note: normally we'd have to clear the other flags,
132 * but currently F is always cleared before calling us.. */
133 F->flags.open = 1;
134 F->flags.is_socket = is_socket;
135 F->hnext = fd_hash[hashv];
136 fd_hash[hashv] = F;
137
138 number_fd++;
139 }
140
141 /* Called to close a given filedescriptor */
142 void
143 fd_close(fde_t *F)
144 {
145 unsigned int hashv = hash_fd(F->fd);
146
147 if (F == fd_next_in_loop)
148 fd_next_in_loop = F->hnext;
149
150 if (F->flags.is_socket)
151 comm_setselect(F, COMM_SELECT_WRITE | COMM_SELECT_READ, NULL, NULL, 0);
152
153 delete_resolver_queries(F);
154
155 #ifdef HAVE_LIBCRYPTO
156 if (F->ssl)
157 SSL_free(F->ssl);
158 #endif
159
160 if (fd_hash[hashv] == F)
161 fd_hash[hashv] = F->hnext;
162 else {
163 fde_t *prev;
164
165 /* let it core if not found */
166 for (prev = fd_hash[hashv]; prev->hnext != F; prev = prev->hnext)
167 ;
168 prev->hnext = F->hnext;
169 }
170
171 /* Unlike squid, we're actually closing the FD here! -- adrian */
172 close(F->fd);
173 number_fd--;
174
175 memset(F, 0, sizeof(fde_t));
176 }
177
178 /*
179 * fd_dump() - dump the list of active filedescriptors
180 */
181 void
182 fd_dump(struct Client *source_p)
183 {
184 int i;
185 fde_t *F;
186
187 for (i = 0; i < FD_HASH_SIZE; i++)
188 for (F = fd_hash[i]; F != NULL; F = F->hnext)
189 sendto_one(source_p, ":%s %d %s :fd %-5d desc '%s'",
190 me.name, RPL_STATSDEBUG, source_p->name,
191 F->fd, F->desc);
192 }
193
194 /*
195 * fd_note() - set the fd note
196 *
197 * Note: must be careful not to overflow fd_table[fd].desc when
198 * calling.
199 */
200 void
201 fd_note(fde_t *F, const char *format, ...)
202 {
203 va_list args;
204
205 if (format != NULL)
206 {
207 va_start(args, format);
208 vsnprintf(F->desc, sizeof(F->desc), format, args);
209 va_end(args);
210 }
211 else
212 F->desc[0] = '\0';
213 }
214
215 /* Make sure stdio descriptors (0-2) and profiler descriptor (3)
216 * always go somewhere harmless. Use -foreground for profiling
217 * or executing from gdb */
218 void
219 close_standard_fds(void)
220 {
221 int i;
222
223 for (i = 0; i < LOWEST_SAFE_FD; i++)
224 {
225 close(i);
226 if (open(PATH_DEVNULL, O_RDWR) < 0)
227 exit(-1); /* we're hosed if we can't even open /dev/null */
228 }
229 }
230
231 void
232 close_fds(fde_t *one)
233 {
234 int i;
235 fde_t *F;
236
237 for (i = 0; i < FD_HASH_SIZE; i++)
238 for (F = fd_hash[i]; F != NULL; F = F->hnext)
239 if (F != one)
240 close(F->fd);
241 }

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svn:eol-style native
svn:keywords Id Revision