[irc/rqf/shadowircd.git] / libratbox / src / devpoll.c

/*
 *  ircd-ratbox: A slightly useful ircd.
 *  s_bsd_devpoll.c: /dev/poll compatible network routines.
 *
 *  Copyright (C) 1990 Jarkko Oikarinen and University of Oulu, Co Center
 *  Copyright (C) 1996-2002 Hybrid Development Team
 *  Copyright (C) 2001 Adrian Chadd <adrian@creative.net.au>
 *  Copyright (C) 2002-2005 ircd-ratbox 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301
 *  USA
 *
 *  $Id: devpoll.c 26092 2008-09-19 15:13:52Z androsyn $
 */
#include <libratbox_config.h>
#include <ratbox_lib.h>
#include <commio-int.h>
#include <fcntl.h>

#if defined(HAVE_DEVPOLL) && (HAVE_DEVPOLL_H)
#include <sys/devpoll.h>


static void devpoll_update_events(int, short, PF *);
static int dpfd;
static int maxfd;
static short *fdmask;
static void devpoll_update_events(int, short, PF *);
static void devpoll_write_update(int, int);


int
rb_setup_fd_devpoll(rb_fde_t *F)
{
	return 0;
}


/*
 * Write an update to the devpoll filter.
 * See, we end up having to do a seperate (?) remove before we do an
 * add of a new polltype, so we have to have this function seperate from
 * the others.
 */
static void
devpoll_write_update(int fd, int events)
{
	struct pollfd pollfds[1];	/* Just to be careful */
	int retval;

	/* Build the pollfd entry */
	pollfds[0].revents = 0;
	pollfds[0].fd = fd;
	pollfds[0].events = events;

	/* Write the thing to our poll fd */
	retval = write(dpfd, &pollfds[0], sizeof(struct pollfd));
	if(retval != sizeof(struct pollfd))
		rb_lib_log("devpoll_write_update: dpfd write failed %d: %s", errno,
			   strerror(errno));
	/* Done! */
}

static void
devpoll_update_events(int fd, short filter, PF * handler)
{
	int update_required = 0;
	int cur_mask = fdmask[fd];
	PF *cur_handler;

	fdmask[fd] = 0;
	switch (filter)
	{
	case RB_SELECT_READ:
		cur_handler = F->read_handler;
		if(handler)
			fdmask[fd] |= POLLRDNORM;
		else
			fdmask[fd] &= ~POLLRDNORM;
		if(F->write_handler)
			fdmask[fd] |= POLLWRNORM;
		break;
	case RB_SELECT_WRITE:
		cur_handler = F->write_handler;
		if(handler)
			fdmask[fd] |= POLLWRNORM;
		else
			fdmask[fd] &= ~POLLWRNORM;
		if(F->read_handler)
			fdmask[fd] |= POLLRDNORM;
		break;
	default:
		return;
		break;
	}

	if(cur_handler == NULL && handler != NULL)
		update_required++;
	else if(cur_handler != NULL && handler == NULL)
		update_required++;
	if(cur_mask != fdmask[fd])
		update_required++;
	if(update_required)
	{
		/*
		 * Ok, we can call devpoll_write_update() here now to re-build the
		 * fd struct. If we end up with nothing on this fd, it won't write
		 * anything.
		 */
		if(fdmask[fd])
		{
			devpoll_write_update(fd, POLLREMOVE);
			devpoll_write_update(fd, fdmask[fd]);
		}
		else
			devpoll_write_update(fd, POLLREMOVE);
	}
}


/* XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX */
/* Public functions */


/*
 * rb_init_netio
 *
 * This is a needed exported function which will be called to initialise
 * the network loop code.
 */
int
rb_init_netio_devpoll(void)
{
	dpfd = open("/dev/poll", O_RDWR);
	if(dpfd < 0)
	{
		return errno;
	}
	maxfd = getdtablesize() - 2;	/* This makes more sense than HARD_FDLIMIT */
	fdmask = rb_malloc(sizeof(fdmask) * maxfd + 1);
	rb_open(dpfd, RB_FD_UNKNOWN, "/dev/poll file descriptor");
}

/*
 * rb_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
rb_setselect_devpoll(rb_fde_t *F, unsigned int type, PF * handler, void *client_data)
{
	lrb_assert(IsFDOpen(F));

	if(type & RB_SELECT_READ)
	{
		devpoll_update_events(fd, RB_SELECT_READ, handler);
		F->read_handler = handler;
		F->read_data = client_data;
	}
	if(type & RB_SELECT_WRITE)
	{
		devpoll_update_events(fd, RB_SELECT_WRITE, handler);
		F->write_handler = handler;
		F->write_data = client_data;
	}
}

/*
 * Check all connections for new connections and input data that is to be
 * processed. Also check for connections with data queued and whether we can
 * write it out.
 */

/*
 * rb_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
 * rb_setselect and fd_table[] and calls callbacks for IO ready
 * events.
 */

int
rb_select_devpoll(long delay)
{
	int num, i;
	struct pollfd pollfds[maxfd];
	struct dvpoll dopoll;

	do
	{
		for(;;)
		{
			dopoll.dp_timeout = delay;
			dopoll.dp_nfds = maxfd;
			dopoll.dp_fds = &pollfds[0];
			num = ioctl(dpfd, DP_POLL, &dopoll);
			if(num >= 0)
				break;
			if(rb_ignore_errno(errno))
				break;
			rb_set_time();
			return RB_ERROR;
		}

		rb_set_time();
		if(num == 0)
			continue;

		for(i = 0; i < num; i++)
		{
			int fd = dopoll.dp_fds[i].fd;
			PF *hdl = NULL;
			rb_fde_t *F = rb_find_fd(fd);
			if((dopoll.dp_fds[i].revents & (POLLRDNORM | POLLIN | POLLHUP |
							POLLERR))
			   && (dopoll.dp_fds[i].events & (POLLRDNORM | POLLIN)))
			{
				if((hdl = F->read_handler) != NULL)
				{
					F->read_handler = NULL;
					hdl(F, F->read_data);
					/*
					 * this call used to be with a NULL pointer, BUT
					 * in the devpoll case we only want to update the
					 * poll set *if* the handler changes state (active ->
					 * NULL or vice versa.)
					 */
					devpoll_update_events(fd, RB_SELECT_READ, F->read_handler);
				}
			}

			if(!IsFDOpen(F))
				continue;	/* Read handler closed us..go on to do something more useful */
			if((dopoll.dp_fds[i].revents & (POLLWRNORM | POLLOUT | POLLHUP |
							POLLERR))
			   && (dopoll.dp_fds[i].events & (POLLWRNORM | POLLOUT)))
			{
				if((hdl = F->write_handler) != NULL)
				{
					F->write_handler = NULL;
					hdl(F, F->write_data);
					/* See above similar code in the read case */
					devpoll_update_events(fd,
							      RB_SELECT_WRITE, F->write_handler);
				}

			}
		}
		return RB_OK;
	}
	while(0);
	/* XXX Get here, we broke! */
	return 0;
}

#else /* /dev/poll not supported */
int
rb_init_netio_devpoll(void)
{
	return ENOSYS;
}

void
rb_setselect_devpoll(rb_fde_t *F, unsigned int type, PF * handler, void *client_data)
{
	errno = ENOSYS;
	return;
}

int
rb_select_devpoll(long delay)
{
	errno = ENOSYS;
	return -1;
}

int
rb_setup_fd_devpoll(rb_fde_t *F)
{
	errno = ENOSYS;
	return -1;
}
#endif
Commit	Line	Data
b57f37fb WP	1	/*
	2	* ircd-ratbox: A slightly useful ircd.
	3	* s_bsd_devpoll.c: /dev/poll compatible network routines.
	4	*
	5	* Copyright (C) 1990 Jarkko Oikarinen and University of Oulu, Co Center
	6	* Copyright (C) 1996-2002 Hybrid Development Team
	7	* Copyright (C) 2001 Adrian Chadd <adrian@creative.net.au>
	8	* Copyright (C) 2002-2005 ircd-ratbox development team
	9	*
	10	* This program is free software; you can redistribute it and/or modify
	11	* it under the terms of the GNU General Public License as published by
	12	* the Free Software Foundation; either version 2 of the License, or
	13	* (at your option) any later version.
	14	*
	15	* This program is distributed in the hope that it will be useful,
	16	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	17	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	18	* GNU General Public License for more details.
	19	*
	20	* You should have received a copy of the GNU General Public License
	21	* along with this program; if not, write to the Free Software
	22	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
	23	* USA
	24	*
94b4fbf9	25	* $Id: devpoll.c 26092 2008-09-19 15:13:52Z androsyn $
b57f37fb WP	26	*/
	27	#include <libratbox_config.h>
	28	#include <ratbox_lib.h>
	29	#include <commio-int.h>
	30	#include <fcntl.h>
	31
	32	#if defined(HAVE_DEVPOLL) && (HAVE_DEVPOLL_H)
	33	#include <sys/devpoll.h>
	34
	35
	36	static void devpoll_update_events(int, short, PF *);
	37	static int dpfd;
	38	static int maxfd;
	39	static short *fdmask;
	40	static void devpoll_update_events(int, short, PF *);
	41	static void devpoll_write_update(int, int);
	42
	43
94b4fbf9	44	int
b57f37fb WP	45	rb_setup_fd_devpoll(rb_fde_t *F)
b57f37fb WP	46	{
94b4fbf9	47	return 0;
b57f37fb	48	}
94b4fbf9 VY	49
94b4fbf9 VY	50
b57f37fb WP	51	/*
	52	* Write an update to the devpoll filter.
	53	* See, we end up having to do a seperate (?) remove before we do an
	54	* add of a new polltype, so we have to have this function seperate from
	55	* the others.
	56	*/
	57	static void
	58	devpoll_write_update(int fd, int events)
	59	{
	60	struct pollfd pollfds[1]; /* Just to be careful */
	61	int retval;
	62
	63	/* Build the pollfd entry */
	64	pollfds[0].revents = 0;
	65	pollfds[0].fd = fd;
	66	pollfds[0].events = events;
	67
	68	/* Write the thing to our poll fd */
	69	retval = write(dpfd, &pollfds[0], sizeof(struct pollfd));
	70	if(retval != sizeof(struct pollfd))
94b4fbf9 VY	71	rb_lib_log("devpoll_write_update: dpfd write failed %d: %s", errno,
94b4fbf9 VY	72	strerror(errno));
b57f37fb WP	73	/* Done! */
	74	}
	75
	76	static void
	77	devpoll_update_events(int fd, short filter, PF * handler)
	78	{
	79	int update_required = 0;
	80	int cur_mask = fdmask[fd];
	81	PF *cur_handler;
	82
	83	fdmask[fd] = 0;
	84	switch (filter)
	85	{
	86	case RB_SELECT_READ:
	87	cur_handler = F->read_handler;
	88	if(handler)
	89	fdmask[fd] \|= POLLRDNORM;
	90	else
	91	fdmask[fd] &= ~POLLRDNORM;
	92	if(F->write_handler)
	93	fdmask[fd] \|= POLLWRNORM;
	94	break;
	95	case RB_SELECT_WRITE:
	96	cur_handler = F->write_handler;
	97	if(handler)
	98	fdmask[fd] \|= POLLWRNORM;
	99	else
	100	fdmask[fd] &= ~POLLWRNORM;
	101	if(F->read_handler)
	102	fdmask[fd] \|= POLLRDNORM;
	103	break;
	104	default:
	105	return;
	106	break;
	107	}
	108
	109	if(cur_handler == NULL && handler != NULL)
	110	update_required++;
	111	else if(cur_handler != NULL && handler == NULL)
	112	update_required++;
	113	if(cur_mask != fdmask[fd])
	114	update_required++;
	115	if(update_required)
	116	{
	117	/*
	118	* Ok, we can call devpoll_write_update() here now to re-build the
	119	* fd struct. If we end up with nothing on this fd, it won't write
	120	* anything.
	121	*/
	122	if(fdmask[fd])
	123	{
	124	devpoll_write_update(fd, POLLREMOVE);
	125	devpoll_write_update(fd, fdmask[fd]);
	126	}
	127	else
	128	devpoll_write_update(fd, POLLREMOVE);
	129	}
	130	}
	131
	132
	133
	134
	135
	136	/* XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX */
137	/* Public functions */
138
139
140	/*
141	* rb_init_netio
142	*
143	* This is a needed exported function which will be called to initialise
144	* the network loop code.
145	*/
146	int
147	rb_init_netio_devpoll(void)
148	{
149	dpfd = open("/dev/poll", O_RDWR);
150	if(dpfd < 0)
151	{
152	return errno;
153	}
94b4fbf9	154	maxfd = getdtablesize() - 2; /* This makes more sense than HARD_FDLIMIT */
b57f37fb WP	155	fdmask = rb_malloc(sizeof(fdmask) * maxfd + 1);
	156	rb_open(dpfd, RB_FD_UNKNOWN, "/dev/poll file descriptor");
	157	}
	158
	159	/*
	160	* rb_setselect
	161	*
	162	* This is a needed exported function which will be called to register
	163	* and deregister interest in a pending IO state for a given FD.
	164	*/
	165	void
94b4fbf9	166	rb_setselect_devpoll(rb_fde_t F, unsigned int type, PF handler, void *client_data)
b57f37fb WP	167	{
	168	lrb_assert(IsFDOpen(F));
	169
	170	if(type & RB_SELECT_READ)
	171	{
	172	devpoll_update_events(fd, RB_SELECT_READ, handler);
	173	F->read_handler = handler;
	174	F->read_data = client_data;
	175	}
	176	if(type & RB_SELECT_WRITE)
	177	{
	178	devpoll_update_events(fd, RB_SELECT_WRITE, handler);
	179	F->write_handler = handler;
	180	F->write_data = client_data;
	181	}
	182	}
	183
	184	/*
	185	* Check all connections for new connections and input data that is to be
	186	* processed. Also check for connections with data queued and whether we can
	187	* write it out.
	188	*/
	189
	190	/*
	191	* rb_select
	192	*
	193	* Called to do the new-style IO, courtesy of squid (like most of this
	194	* new IO code). This routine handles the stuff we've hidden in
	195	* rb_setselect and fd_table[] and calls callbacks for IO ready
	196	* events.
	197	*/
	198
	199	int
	200	rb_select_devpoll(long delay)
	201	{
	202	int num, i;
	203	struct pollfd pollfds[maxfd];
	204	struct dvpoll dopoll;
	205
	206	do
	207	{
94b4fbf9	208	for(;;)
b57f37fb WP	209	{
	210	dopoll.dp_timeout = delay;
	211	dopoll.dp_nfds = maxfd;
	212	dopoll.dp_fds = &pollfds[0];
	213	num = ioctl(dpfd, DP_POLL, &dopoll);
	214	if(num >= 0)
	215	break;
	216	if(rb_ignore_errno(errno))
	217	break;
	218	rb_set_time();
	219	return RB_ERROR;
	220	}
	221
	222	rb_set_time();
	223	if(num == 0)
	224	continue;
	225
94b4fbf9	226	for(i = 0; i < num; i++)
b57f37fb WP	227	{
	228	int fd = dopoll.dp_fds[i].fd;
	229	PF *hdl = NULL;
	230	rb_fde_t *F = rb_find_fd(fd);
94b4fbf9 VY	231	if((dopoll.dp_fds[i].revents & (POLLRDNORM \| POLLIN \| POLLHUP \|
94b4fbf9 VY	232	POLLERR))
b57f37fb WP	233	&& (dopoll.dp_fds[i].events & (POLLRDNORM \| POLLIN)))
	234	{
	235	if((hdl = F->read_handler) != NULL)
	236	{
	237	F->read_handler = NULL;
	238	hdl(F, F->read_data);
	239	/*
	240	* this call used to be with a NULL pointer, BUT
	241	* in the devpoll case we only want to update the
	242	* poll set if the handler changes state (active ->
	243	* NULL or vice versa.)
	244	*/
94b4fbf9	245	devpoll_update_events(fd, RB_SELECT_READ, F->read_handler);
b57f37fb WP	246	}
	247	}
	248
	249	if(!IsFDOpen(F))
	250	continue; /* Read handler closed us..go on to do something more useful */
94b4fbf9 VY	251	if((dopoll.dp_fds[i].revents & (POLLWRNORM \| POLLOUT \| POLLHUP \|
94b4fbf9 VY	252	POLLERR))
b57f37fb WP	253	&& (dopoll.dp_fds[i].events & (POLLWRNORM \| POLLOUT)))
	254	{
	255	if((hdl = F->write_handler) != NULL)
	256	{
	257	F->write_handler = NULL;
	258	hdl(F, F->write_data);
	259	/* See above similar code in the read case */
	260	devpoll_update_events(fd,
	261	RB_SELECT_WRITE, F->write_handler);
	262	}
	263
	264	}
	265	}
	266	return RB_OK;
	267	}
94b4fbf9	268	while(0);
b57f37fb WP	269	/* XXX Get here, we broke! */
	270	return 0;
	271	}
	272
	273	#else /* /dev/poll not supported */
94b4fbf9	274	int
b57f37fb WP	275	rb_init_netio_devpoll(void)
	276	{
	277	return ENOSYS;
	278	}
	279
	280	void
	281	rb_setselect_devpoll(rb_fde_t F, unsigned int type, PF handler, void *client_data)
	282	{
	283	errno = ENOSYS;
	284	return;
	285	}
	286
	287	int
	288	rb_select_devpoll(long delay)
	289	{
	290	errno = ENOSYS;
	291	return -1;
	292	}
	293
	294	int
	295	rb_setup_fd_devpoll(rb_fde_t *F)
	296	{
	297	errno = ENOSYS;
	298	return -1;
	299	}
	300	#endif