trunk/src/fdlist.c

/*
 *  ircd-hybrid: an advanced Internet Relay Chat Daemon(ircd).
 *  fdlist.c: Maintains a list of file descriptors.
 *
 *  Copyright (C) 2002 by the past and present ircd coders, and others.
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
 *  USA
 *
 *  $Id$
 */
#include "stdinc.h"
#include "fdlist.h"
#include "client.h"  /* struct Client */
#include "common.h"
#include "event.h"
#include "ircd.h"    /* GlobalSetOptions */
#include "irc_string.h"
#include "rlimits.h"
#include "s_bsd.h"   /* comm_setselect */
#include "s_conf.h"  /* ServerInfo */
#include "send.h"
#include "memory.h"
#include "numeric.h"

fde_t *fd_hash[FD_HASH_SIZE];
fde_t *fd_next_in_loop = NULL;
int number_fd = LEAKED_FDS;
int hard_fdlimit = 0;
struct Callback *fdlimit_cb = NULL;

static void *
changing_fdlimit(va_list args)
{
  int old_fdlimit = hard_fdlimit;

  hard_fdlimit = va_arg(args, int);

  if (ServerInfo.max_clients > MAXCLIENTS_MAX)
  {
    if (old_fdlimit != 0)
      sendto_realops_flags(UMODE_ALL, L_ALL,
        "HARD_FDLIMIT changed to %d, adjusting MAXCLIENTS to %d",
        hard_fdlimit, MAXCLIENTS_MAX);

    ServerInfo.max_clients = MAXCLIENTS_MAX;
  }

  return NULL;
}

void
fdlist_init(void)
{
  memset(&fd_hash, 0, sizeof(fd_hash));

  fdlimit_cb = register_callback("changing_fdlimit", changing_fdlimit);
  eventAddIsh("recalc_fdlimit", recalc_fdlimit, NULL, 58);
  recalc_fdlimit(NULL);
}

void
recalc_fdlimit(void *unused)
{
  int fdmax;
  struct rlimit limit;

  if (!getrlimit(RLIMIT_FD_MAX, &limit))
  {
    limit.rlim_cur = limit.rlim_max;
    setrlimit(RLIMIT_FD_MAX, &limit);
  }

  fdmax = getdtablesize();

  /* allow MAXCLIENTS_MIN clients even at the cost of MAX_BUFFER and
   * some not really LEAKED_FDS */
  fdmax = IRCD_MAX(fdmax, LEAKED_FDS + MAX_BUFFER + MAXCLIENTS_MIN);

  /* under no condition shall this raise over 65536
   * for example user ip heap is sized 2*hard_fdlimit */
  fdmax = IRCD_MIN(fdmax, 65536);

  if (fdmax != hard_fdlimit)
    execute_callback(fdlimit_cb, fdmax);
}

static inline unsigned int
hash_fd(int fd)
{
  return (((unsigned) fd) % FD_HASH_SIZE);
}

fde_t *
lookup_fd(int fd)
{
  fde_t *F = fd_hash[hash_fd(fd)];

  while (F)
  {
    if (F->fd == fd)
      return (F);
    F = F->hnext;
  }

  return (NULL);
}

/* Called to open a given filedescriptor */
void
fd_open(fde_t *F, int fd, int is_socket, const char *desc)
{
  unsigned int hashv = hash_fd(fd);
  assert(fd >= 0);

  F->fd = fd;
  F->comm_index = -1;
  if (desc)
    strlcpy(F->desc, desc, sizeof(F->desc));
  /* Note: normally we'd have to clear the other flags,
   * but currently F is always cleared before calling us.. */
  F->flags.open = 1;
  F->flags.is_socket = is_socket;
  F->hnext = fd_hash[hashv];
  fd_hash[hashv] = F;

  number_fd++;
}

/* Called to close a given filedescriptor */
void
fd_close(fde_t *F)
{
  unsigned int hashv = hash_fd(F->fd);

  if (F == fd_next_in_loop)
    fd_next_in_loop = F->hnext;

  if (F->flags.is_socket)
    comm_setselect(F, COMM_SELECT_WRITE | COMM_SELECT_READ, NULL, NULL, 0);

  delete_resolver_queries(F);

#ifdef HAVE_LIBCRYPTO
  if (F->ssl)
    SSL_free(F->ssl);
#endif

  if (fd_hash[hashv] == F)
    fd_hash[hashv] = F->hnext;
  else {
    fde_t *prev;

    /* let it core if not found */
    for (prev = fd_hash[hashv]; prev->hnext != F; prev = prev->hnext)
      ;
    prev->hnext = F->hnext;
  }

  /* Unlike squid, we're actually closing the FD here! -- adrian */
  close(F->fd);
  number_fd--;

  memset(F, 0, sizeof(fde_t));
}

/*
 * fd_dump() - dump the list of active filedescriptors
 */
void
fd_dump(struct Client *source_p)
{
  int i;
  fde_t *F;

  for (i = 0; i < FD_HASH_SIZE; i++)
    for (F = fd_hash[i]; F != NULL; F = F->hnext)
      sendto_one(source_p, ":%s %d %s :fd %-5d desc '%s'",
                 me.name, RPL_STATSDEBUG, source_p->name,
                 F->fd, F->desc);
}

/*
 * fd_note() - set the fd note
 *
 * Note: must be careful not to overflow fd_table[fd].desc when
 *       calling.
 */
void
fd_note(fde_t *F, const char *format, ...)
{
  va_list args;

  if (format != NULL)
  {
    va_start(args, format);
    vsnprintf(F->desc, sizeof(F->desc), format, args);
    va_end(args);
  }
  else
    F->desc[0] = '\0';
}

/* Make sure stdio descriptors (0-2) and profiler descriptor (3)
 * always go somewhere harmless.  Use -foreground for profiling
 * or executing from gdb */
void
close_standard_fds(void)
{
  int i;

  for (i = 0; i < LOWEST_SAFE_FD; i++)
  {
    close(i);
    if (open(PATH_DEVNULL, O_RDWR) < 0)
      exit(-1); /* we're hosed if we can't even open /dev/null */
  }
}

void
close_fds(fde_t *one)
{
  int i;
  fde_t *F;

  for (i = 0; i < FD_HASH_SIZE; i++)
    for (F = fd_hash[i]; F != NULL; F = F->hnext)
      if (F != one)
        close(F->fd);
}
Revision:	1155
Committed:	Tue Aug 9 20:27:45 2011 UTC (14 years ago) by michael
Content type:	text/x-csrc
Original Path:	*ircd-hybrid/src/fdlist.c*
File size:	5454 byte(s)
Log Message:	- recreate "trunk"
#	User	Rev	Content
1	adx	30	/*
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	knight	31	* $Id$
23	adx	30	*/
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 "rlimits.h"
32			#include "s_bsd.h" /* comm_setselect */
33			#include "s_conf.h" /* ServerInfo */
34			#include "send.h"
35			#include "memory.h"
36			#include "numeric.h"
37
38			fde_t *fd_hash[FD_HASH_SIZE];
39			fde_t *fd_next_in_loop = NULL;
40			int number_fd = LEAKED_FDS;
41			int hard_fdlimit = 0;
42			struct Callback *fdlimit_cb = NULL;
43
44			static void *
45			changing_fdlimit(va_list args)
46			{
47			int old_fdlimit = hard_fdlimit;
48
49			hard_fdlimit = va_arg(args, int);
50
51			if (ServerInfo.max_clients > MAXCLIENTS_MAX)
52			{
53			if (old_fdlimit != 0)
54			sendto_realops_flags(UMODE_ALL, L_ALL,
55			"HARD_FDLIMIT changed to %d, adjusting MAXCLIENTS to %d",
56			hard_fdlimit, MAXCLIENTS_MAX);
57
58			ServerInfo.max_clients = MAXCLIENTS_MAX;
59			}
60
61			return NULL;
62			}
63
64			void
65			fdlist_init(void)
66			{
67			memset(&fd_hash, 0, sizeof(fd_hash));
68
69			fdlimit_cb = register_callback("changing_fdlimit", changing_fdlimit);
70			eventAddIsh("recalc_fdlimit", recalc_fdlimit, NULL, 58);
71			recalc_fdlimit(NULL);
72			}
73
74			void
75			recalc_fdlimit(void *unused)
76			{
77			int fdmax;
78			struct rlimit limit;
79
80			if (!getrlimit(RLIMIT_FD_MAX, &limit))
81			{
82			limit.rlim_cur = limit.rlim_max;
83			setrlimit(RLIMIT_FD_MAX, &limit);
84			}
85
86			fdmax = getdtablesize();
87
88			/* allow MAXCLIENTS_MIN clients even at the cost of MAX_BUFFER and
89			* some not really LEAKED_FDS */
90			fdmax = IRCD_MAX(fdmax, LEAKED_FDS + MAX_BUFFER + MAXCLIENTS_MIN);
91
92			/* under no condition shall this raise over 65536
93			* for example user ip heap is sized 2hard_fdlimit /
94			fdmax = IRCD_MIN(fdmax, 65536);
95
96			if (fdmax != hard_fdlimit)
97			execute_callback(fdlimit_cb, fdmax);
98			}
99
100			static inline unsigned int
101			hash_fd(int fd)
102			{
103			return (((unsigned) fd) % FD_HASH_SIZE);
104			}
105
106			fde_t *
107			lookup_fd(int fd)
108			{
109			fde_t *F = fd_hash[hash_fd(fd)];
110
111			while (F)
112			{
113			if (F->fd == fd)
114			return (F);
115			F = F->hnext;
116			}
117
118			return (NULL);
119			}
120
121			/* Called to open a given filedescriptor */
122			void
123			fd_open(fde_t F, int fd, int is_socket, const char desc)
124			{
125			unsigned int hashv = hash_fd(fd);
126			assert(fd >= 0);
127
128			F->fd = fd;
129			F->comm_index = -1;
130			if (desc)
131			strlcpy(F->desc, desc, sizeof(F->desc));
132			/* Note: normally we'd have to clear the other flags,
133			* but currently F is always cleared before calling us.. */
134			F->flags.open = 1;
135			F->flags.is_socket = is_socket;
136			F->hnext = fd_hash[hashv];
137			fd_hash[hashv] = F;
138
139			number_fd++;
140			}
141
142			/* Called to close a given filedescriptor */
143			void
144			fd_close(fde_t *F)
145			{
146			unsigned int hashv = hash_fd(F->fd);
147
148			if (F == fd_next_in_loop)
149			fd_next_in_loop = F->hnext;
150
151			if (F->flags.is_socket)
152			comm_setselect(F, COMM_SELECT_WRITE \| COMM_SELECT_READ, NULL, NULL, 0);
153
154	michael	992	delete_resolver_queries(F);
155	adx	30
156			#ifdef HAVE_LIBCRYPTO
157			if (F->ssl)
158			SSL_free(F->ssl);
159			#endif
160
161			if (fd_hash[hashv] == F)
162			fd_hash[hashv] = F->hnext;
163			else {
164			fde_t *prev;
165
166			/* let it core if not found */
167			for (prev = fd_hash[hashv]; prev->hnext != F; prev = prev->hnext)
168			;
169			prev->hnext = F->hnext;
170			}
171
172			/* Unlike squid, we're actually closing the FD here! -- adrian */
173			close(F->fd);
174			number_fd--;
175	michael	436
176			memset(F, 0, sizeof(fde_t));
177	adx	30	}
178
179			/*
180			* fd_dump() - dump the list of active filedescriptors
181			*/
182			void
183			fd_dump(struct Client *source_p)
184			{
185			int i;
186			fde_t *F;
187
188			for (i = 0; i < FD_HASH_SIZE; i++)
189			for (F = fd_hash[i]; F != NULL; F = F->hnext)
190			sendto_one(source_p, ":%s %d %s :fd %-5d desc '%s'",
191			me.name, RPL_STATSDEBUG, source_p->name,
192			F->fd, F->desc);
193			}
194
195			/*
196			* fd_note() - set the fd note
197			*
198			* Note: must be careful not to overflow fd_table[fd].desc when
199			* calling.
200			*/
201			void
202			fd_note(fde_t F, const char format, ...)
203			{
204			va_list args;
205
206			if (format != NULL)
207			{
208			va_start(args, format);
209			vsnprintf(F->desc, sizeof(F->desc), format, args);
210			va_end(args);
211			}
212			else
213			F->desc[0] = '\0';
214			}
215
216			/* Make sure stdio descriptors (0-2) and profiler descriptor (3)
217			* always go somewhere harmless. Use -foreground for profiling
218			* or executing from gdb */
219			void
220			close_standard_fds(void)
221			{
222			int i;
223
224			for (i = 0; i < LOWEST_SAFE_FD; i++)
225			{
226			close(i);
227			if (open(PATH_DEVNULL, O_RDWR) < 0)
228			exit(-1); /* we're hosed if we can't even open /dev/null */
229			}
230			}
231
232			void
233			close_fds(fde_t *one)
234			{
235			int i;
236			fde_t *F;
237
238			for (i = 0; i < FD_HASH_SIZE; i++)
239			for (F = fd_hash[i]; F != NULL; F = F->hnext)
240			if (F != one)
241			close(F->fd);
242			}