ermyth/src/poll.C

/*
 * poll.C: poll(2) socket engine.
 *
 * Copyright © 2007 Pippijn van Steenhoven / The Ermyth Team
 * Rights to this code are as documented in COPYING.
 *
 *
 * Portions of this file were derived from sources bearing the following license:
 * Rights to this code are documented in doc/pod/license.pod.
 * Copyright © 2005-2007 Atheme Project (http://www.atheme.org)
 */

static char const rcsid[] = "$Id: poll.C,v 1.6 2007-09-05 11:23:15 pippijn Exp $";

#include <sys/poll.h>

#include "atheme.h"
#include "internal.h"
#include "datastream.h"
#include "connection.h"

/*
 * linux does not provide POLLWRNORM by default, and we're not _XOPEN_SOURCE.
 * so.... we have to do this crap below.
 */
#ifndef POLLRDNORM
#define POLLRDNORM POLLIN
#endif
#ifndef POLLWRNORM
#define POLLWRNORM POLLOUT
#endif

pollfd pollfds[FD_SETSIZE];     /* XXX We need a define indicating MAXCONN. */

/*
 * init_socket_queues()
 *
 * inputs:
 *       none
 *
 * outputs:
 *       none
 *
 * side effects:
 *       when using select, we don't need to do anything here.
 */
void
init_socket_queues (void)
{
  memset (&pollfds, 0, sizeof (pollfd) * FD_SETSIZE);
}

/*
 * update_poll_fds()
 *
 * inputs:
 *       none
 *
 * outputs:
 *       none
 *
 * side effects:
 *       registered sockets are prepared for the poll() loop.
 */
static void
update_poll_fds (void)
{
  connection_t::list_type::iterator it = connection_t::list.begin ();
  connection_t::list_type::iterator et = connection_t::list.end ();
  int slot = 0;

  while (it != et)
    {
      connection_t *cptr = *it;
      
      cptr->pollslot = slot;
      
      if (cptr->is_connecting () || sendq_nonempty (cptr))
        {
          pollfds[slot].fd = cptr->fd;
          pollfds[slot].events |= POLLWRNORM;
          pollfds[slot].revents = 0;
        }
      else
        {
          pollfds[slot].fd = cptr->fd;
          pollfds[slot].events |= POLLRDNORM;
          pollfds[slot].revents = 0;
        }
      slot++;
      ++it;
    }
}

/*
 * connection_t::select()
 *
 * inputs:
 *       delay in microseconds
 *
 * outputs:
 *       none
 *
 * side effects:
 *       registered sockets and their associated handlers are acted on.
 */
void
connection_t::select (time_t delay)
{
  int sr;
  connection_t::list_type::iterator it = connection_t::list.begin ();
  connection_t::list_type::iterator et = connection_t::list.end ();
  int slot;

  update_poll_fds ();

  if ((sr = poll (pollfds, connection_t::list.size (), delay / 100)) > 0)
    {
      /* Iterate twice, so we don't touch freed memory if
       * a connection is closed.
       * -- jilles */
      while (it != et)
        {
          connection_t *cptr = *it;
          ++it; // increment here or continue will cause an endless loop
          slot = cptr->pollslot;
          
          if (pollfds[slot].revents == 0)
            continue;
          
          if (pollfds[slot].revents & (POLLRDNORM | POLLIN | POLLHUP | POLLERR))
            {
              pollfds[slot].events &= ~(POLLRDNORM | POLLIN | POLLHUP | POLLERR);
              cptr->read_handler (cptr);
            }
        }
      
      for (it = connection_t::list.begin (), et = connection_t::list.end (); it != et; ++it)
        {
          connection_t *cptr = *it;
          slot = cptr->pollslot;
          
          if (pollfds[slot].revents == 0)
            continue;
          if (pollfds[slot].revents & (POLLWRNORM | POLLOUT | POLLHUP | POLLERR))
            {
              pollfds[slot].events &= ~(POLLWRNORM | POLLOUT | POLLHUP | POLLERR);
              if (cptr->is_connecting ())
                cptr->callback.connected (cptr);
              else
                cptr->write_handler (cptr);
            }
        }
      
      for (it = connection_t::list.begin (), et = connection_t::list.end (); it != et; ++it)
        {
          connection_t *cptr = *it;
          if (cptr->flags & CF_DEAD)
            cptr->close ();
        }
    }
}
Revision:	1.7
Committed:	Sun Sep 16 18:54:45 2007 UTC (19 years ago) by pippijn
Content type:	text/plain
Branch:	MAIN
CVS Tags:	HEAD
Changes since 1.6:	+7 -2 lines
Log Message:	#defines to enum
#	Content
1	/*
2	* poll.C: poll(2) socket engine.
3	*
4	* Copyright © 2007 Pippijn van Steenhoven / The Ermyth Team
5	* Rights to this code are as documented in COPYING.
6	*
7	*
8	* Portions of this file were derived from sources bearing the following license:
9	* Rights to this code are documented in doc/pod/license.pod.
10	* Copyright © 2005-2007 Atheme Project (http://www.atheme.org)
11	*/
12
13	static char const rcsid[] = "$Id: poll.C,v 1.6 2007-09-05 11:23:15 pippijn Exp $";
14
15	#include <sys/poll.h>
16
17	#include "atheme.h"
18	#include "internal.h"
19	#include "datastream.h"
20	#include "connection.h"
21
22	/*
23	* linux does not provide POLLWRNORM by default, and we're not _XOPEN_SOURCE.
24	* so.... we have to do this crap below.
25	*/
26	#ifndef POLLRDNORM
27	#define POLLRDNORM POLLIN
28	#endif
29	#ifndef POLLWRNORM
30	#define POLLWRNORM POLLOUT
31	#endif
32
33	pollfd pollfds[FD_SETSIZE]; /* XXX We need a define indicating MAXCONN. */
34
35	/*
36	* init_socket_queues()
37	*
38	* inputs:
39	* none
40	*
41	* outputs:
42	* none
43	*
44	* side effects:
45	* when using select, we don't need to do anything here.
46	*/
47	void
48	init_socket_queues (void)
49	{
50	memset (&pollfds, 0, sizeof (pollfd) * FD_SETSIZE);
51	}
52
53	/*
54	* update_poll_fds()
55	*
56	* inputs:
57	* none
58	*
59	* outputs:
60	* none
61	*
62	* side effects:
63	* registered sockets are prepared for the poll() loop.
64	*/
65	static void
66	update_poll_fds (void)
67	{
68	connection_t::list_type::iterator it = connection_t::list.begin ();
69	connection_t::list_type::iterator et = connection_t::list.end ();
70	int slot = 0;
71
72	while (it != et)
73	{
74	connection_t cptr = it;
75
76	cptr->pollslot = slot;
77
78	if (cptr->is_connecting () \|\| sendq_nonempty (cptr))
79	{
80	pollfds[slot].fd = cptr->fd;
81	pollfds[slot].events \|= POLLWRNORM;
82	pollfds[slot].revents = 0;
83	}
84	else
85	{
86	pollfds[slot].fd = cptr->fd;
87	pollfds[slot].events \|= POLLRDNORM;
88	pollfds[slot].revents = 0;
89	}
90	slot++;
91	++it;
92	}
93	}
94
95	/*
96	* connection_t::select()
97	*
98	* inputs:
99	* delay in microseconds
100	*
101	* outputs:
102	* none
103	*
104	* side effects:
105	* registered sockets and their associated handlers are acted on.
106	*/
107	void
108	connection_t::select (time_t delay)
109	{
110	int sr;
111	connection_t::list_type::iterator it = connection_t::list.begin ();
112	connection_t::list_type::iterator et = connection_t::list.end ();
113	int slot;
114
115	update_poll_fds ();
116
117	if ((sr = poll (pollfds, connection_t::list.size (), delay / 100)) > 0)
118	{
119	/* Iterate twice, so we don't touch freed memory if
120	* a connection is closed.
121	* -- jilles */
122	while (it != et)
123	{
124	connection_t cptr = it;
125	++it; // increment here or continue will cause an endless loop
126	slot = cptr->pollslot;
127
128	if (pollfds[slot].revents == 0)
129	continue;
130
131	if (pollfds[slot].revents & (POLLRDNORM \| POLLIN \| POLLHUP \| POLLERR))
132	{
133	pollfds[slot].events &= ~(POLLRDNORM \| POLLIN \| POLLHUP \| POLLERR);
134	cptr->read_handler (cptr);
135	}
136	}
137
138	for (it = connection_t::list.begin (), et = connection_t::list.end (); it != et; ++it)
139	{
140	connection_t cptr = it;
141	slot = cptr->pollslot;
142
143	if (pollfds[slot].revents == 0)
144	continue;
145	if (pollfds[slot].revents & (POLLWRNORM \| POLLOUT \| POLLHUP \| POLLERR))
146	{
147	pollfds[slot].events &= ~(POLLWRNORM \| POLLOUT \| POLLHUP \| POLLERR);
148	if (cptr->is_connecting ())
149	cptr->callback.connected (cptr);
150	else
151	cptr->write_handler (cptr);
152	}
153	}
154
155	for (it = connection_t::list.begin (), et = connection_t::list.end (); it != et; ++it)
156	{
157	connection_t cptr = it;
158	if (cptr->flags & CF_DEAD)
159	cptr->close ();
160	}
161	}
162	}