trunk/src/s_bsd_select.c

/*
 *  ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd)
 *
 *  Copyright (c) 2000-2014 ircd-hybrid development team
 *
 *  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
 */

/*! \file s_bsd_select.c
 * \brief select() compatible network routines.
 * \version $Id$
 */

#include "stdinc.h"
#if USE_IOPOLL_MECHANISM == __IOPOLL_MECHANISM_SELECT
#include "list.h"
#include "fdlist.h"
#include "hook.h"
#include "ircd.h"
#include "s_bsd.h"
#include "log.h"

/*
 * Note that this is only a single list - multiple lists is kinda pointless
 * under select because the list size is a function of the highest FD :-)
 *   -- adrian
 */

static fd_set select_readfds, tmpreadfds;
static fd_set select_writefds, tmpwritefds;
static int highest_fd = -1;


/*
 * init_netio
 *
 * This is a needed exported function which will be called to initialise
 * the network loop code.
 */
void
init_netio(void)
{
  FD_ZERO(&select_readfds);
  FD_ZERO(&select_writefds);
}

/*
 * comm_setselect
 *
 * This is a needed exported function which will be called to register
 * and deregister interest in a pending IO state for a given FD.
 */
void
comm_setselect(fde_t *F, unsigned int type, PF *handler,
               void *client_data, time_t timeout)
{
  int new_events;

  if ((type & COMM_SELECT_READ))
  {
    F->read_handler = handler;
    F->read_data = client_data;
  }

  if ((type & COMM_SELECT_WRITE))
  {
    F->write_handler = handler;
    F->write_data = client_data;
  }

  new_events = (F->read_handler ? COMM_SELECT_READ : 0) |
               (F->write_handler ? COMM_SELECT_WRITE : 0);

  if (timeout != 0)
  {
    F->timeout = CurrentTime + (timeout / 1000);
    F->timeout_handler = handler;
    F->timeout_data = client_data;
  }

  if (new_events != F->evcache)
  {
    if ((new_events & COMM_SELECT_READ))
      FD_SET(F->fd, &select_readfds);
    else
    {
      FD_CLR(F->fd, &select_readfds);
      FD_CLR(F->fd, &tmpreadfds);
    }

    if ((new_events & COMM_SELECT_WRITE))
      FD_SET(F->fd, &select_writefds);
    else
    {
      FD_CLR(F->fd, &select_writefds);
      FD_CLR(F->fd, &tmpwritefds);
    }

    if (new_events == 0)
    {
      if (highest_fd == F->fd)
        while (highest_fd >= 0 && (FD_ISSET(highest_fd, &select_readfds) ||
                                   FD_ISSET(highest_fd, &select_writefds)))
          highest_fd--;
    }
    else if (F->evcache == 0)
      if (F->fd > highest_fd)
        highest_fd = F->fd;

    F->evcache = new_events;
  }
}

/*
 * comm_select
 *
 * Called to do the new-style IO, courtesy of squid (like most of this
 * new IO code). This routine handles the stuff we've hidden in
 * comm_setselect and fd_table[] and calls callbacks for IO ready
 * events.
 */
void
comm_select(void)
{
  struct timeval to;
  int num, fd;
  fde_t *F;
  PF *hdl;

  /* Copy over the read/write sets so we don't have to rebuild em */
  memcpy(&tmpreadfds, &select_readfds, sizeof(fd_set));
  memcpy(&tmpwritefds, &select_writefds, sizeof(fd_set));

  to.tv_sec = 0;
  to.tv_usec = SELECT_DELAY * 1000;
  num = select(highest_fd + 1, &tmpreadfds, &tmpwritefds, NULL, &to);

  set_time();

  if (num < 0)
  {
#ifdef HAVE_USLEEP
    usleep(50000);
#endif
    return;
  }

  for (fd = 0; fd <= highest_fd && num > 0; fd++)
  {
    if (FD_ISSET(fd, &tmpreadfds) || FD_ISSET(fd, &tmpwritefds))
    {
      num--;

      F = lookup_fd(fd);
      if (F == NULL || !F->flags.open)
        continue;

      if (FD_ISSET(fd, &tmpreadfds))
      {
        if ((hdl = F->read_handler) != NULL)
        {
          F->read_handler = NULL;
          hdl(F, F->read_data);
          if (!F->flags.open)
            continue;
        }
      }

      if (FD_ISSET(fd, &tmpwritefds))
      {
        if ((hdl = F->write_handler) != NULL)
        {
          F->write_handler = NULL;
          hdl(F, F->write_data);
          if (!F->flags.open)
            continue;
        }
      }

      comm_setselect(F, 0, NULL, NULL, 0);
    }
  }
}
#endif
Revision:	2916
Committed:	Sat Jan 25 21:09:18 2014 UTC (11 years, 7 months ago) by michael
Content type:	text/x-csrc
File size:	4668 byte(s)
Log Message:	- Clean up all files in include/ (fixed indentation, removed whitespaces/tabs) - Fixed copyright years
#	User	Rev	Content
1	adx	30	/*
2	michael	2916	* ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd)
3	adx	30	*
4	michael	2916	* Copyright (c) 2000-2014 ircd-hybrid development team
5	adx	30	*
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	michael	2916	/*! \file s_bsd_select.c
23			* \brief select() compatible network routines.
24			* \version $Id$
25			*/
26
27	adx	30	#include "stdinc.h"
28	stu	908	#if USE_IOPOLL_MECHANISM == __IOPOLL_MECHANISM_SELECT
29	michael	1021	#include "list.h"
30	adx	30	#include "fdlist.h"
31			#include "hook.h"
32			#include "ircd.h"
33			#include "s_bsd.h"
34	michael	1309	#include "log.h"
35	adx	30
36			/*
37			* Note that this is only a single list - multiple lists is kinda pointless
38			* under select because the list size is a function of the highest FD :-)
39			* -- adrian
40			*/
41
42			static fd_set select_readfds, tmpreadfds;
43			static fd_set select_writefds, tmpwritefds;
44			static int highest_fd = -1;
45
46
47			/*
48			* init_netio
49			*
50			* This is a needed exported function which will be called to initialise
51			* the network loop code.
52			*/
53			void
54			init_netio(void)
55			{
56			FD_ZERO(&select_readfds);
57			FD_ZERO(&select_writefds);
58			}
59
60			/*
61			* comm_setselect
62			*
63			* This is a needed exported function which will be called to register
64			* and deregister interest in a pending IO state for a given FD.
65			*/
66			void
67			comm_setselect(fde_t F, unsigned int type, PF handler,
68			void *client_data, time_t timeout)
69			{
70			int new_events;
71
72			if ((type & COMM_SELECT_READ))
73			{
74			F->read_handler = handler;
75			F->read_data = client_data;
76			}
77
78			if ((type & COMM_SELECT_WRITE))
79			{
80			F->write_handler = handler;
81			F->write_data = client_data;
82			}
83
84			new_events = (F->read_handler ? COMM_SELECT_READ : 0) \|
85	michael	2650	(F->write_handler ? COMM_SELECT_WRITE : 0);
86	adx	30
87			if (timeout != 0)
88	michael	2725	{
89	adx	30	F->timeout = CurrentTime + (timeout / 1000);
90	michael	2725	F->timeout_handler = handler;
91			F->timeout_data = client_data;
92			}
93	adx	30
94			if (new_events != F->evcache)
95			{
96			if ((new_events & COMM_SELECT_READ))
97			FD_SET(F->fd, &select_readfds);
98			else
99			{
100			FD_CLR(F->fd, &select_readfds);
101			FD_CLR(F->fd, &tmpreadfds);
102			}
103
104			if ((new_events & COMM_SELECT_WRITE))
105			FD_SET(F->fd, &select_writefds);
106			else
107			{
108			FD_CLR(F->fd, &select_writefds);
109			FD_CLR(F->fd, &tmpwritefds);
110			}
111
112			if (new_events == 0)
113			{
114			if (highest_fd == F->fd)
115			while (highest_fd >= 0 && (FD_ISSET(highest_fd, &select_readfds) \|\|
116	michael	2650	FD_ISSET(highest_fd, &select_writefds)))
117	adx	30	highest_fd--;
118			}
119			else if (F->evcache == 0)
120			if (F->fd > highest_fd)
121			highest_fd = F->fd;
122
123			F->evcache = new_events;
124			}
125			}
126
127			/*
128			* comm_select
129			*
130			* Called to do the new-style IO, courtesy of squid (like most of this
131			* new IO code). This routine handles the stuff we've hidden in
132			* comm_setselect and fd_table[] and calls callbacks for IO ready
133			* events.
134			*/
135			void
136			comm_select(void)
137			{
138			struct timeval to;
139			int num, fd;
140			fde_t *F;
141			PF *hdl;
142
143			/* Copy over the read/write sets so we don't have to rebuild em */
144			memcpy(&tmpreadfds, &select_readfds, sizeof(fd_set));
145			memcpy(&tmpwritefds, &select_writefds, sizeof(fd_set));
146
147			to.tv_sec = 0;
148			to.tv_usec = SELECT_DELAY * 1000;
149			num = select(highest_fd + 1, &tmpreadfds, &tmpwritefds, NULL, &to);
150
151			set_time();
152
153			if (num < 0)
154			{
155			#ifdef HAVE_USLEEP
156			usleep(50000);
157			#endif
158			return;
159			}
160
161			for (fd = 0; fd <= highest_fd && num > 0; fd++)
162	michael	2650	{
163	adx	30	if (FD_ISSET(fd, &tmpreadfds) \|\| FD_ISSET(fd, &tmpwritefds))
164			{
165			num--;
166
167			F = lookup_fd(fd);
168			if (F == NULL \|\| !F->flags.open)
169			continue;
170
171			if (FD_ISSET(fd, &tmpreadfds))
172	michael	2650	{
173	adx	30	if ((hdl = F->read_handler) != NULL)
174			{
175			F->read_handler = NULL;
176			hdl(F, F->read_data);
177			if (!F->flags.open)
178			continue;
179			}
180	michael	2650	}
181	adx	30
182			if (FD_ISSET(fd, &tmpwritefds))
183	michael	2650	{
184	adx	30	if ((hdl = F->write_handler) != NULL)
185			{
186			F->write_handler = NULL;
187			hdl(F, F->write_data);
188			if (!F->flags.open)
189			continue;
190			}
191	michael	2650	}
192	adx	30
193			comm_setselect(F, 0, NULL, NULL, 0);
194			}
195	michael	2650	}
196	adx	30	}
197	stu	908	#endif