libev/ev_port.c

/*
 * Copyright 2007      Marc Alexander Lehmann <libev@schmorp.de>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/types.h>
#include <sys/time.h>
#include <poll.h>
#include <port.h>
#include <string.h>
#include <errno.h>

static void
port_modify (EV_P_ int fd, int oev, int nev)
{
  /* we need to reassociate no matter what, as closes are
   * once more silently being discarded.
   */
  if (!nev)
    {
      if (oev)
        port_dissociate (port_fd, PORT_SOURCE_FD, fd);
    }
  else if (0 >
      port_associate (
         port_fd, PORT_SOURCE_FD, fd,
         (nev & EV_READ ? POLLIN : 0)
         | (nev & EV_WRITE ? POLLOUT : 0),
         0
      )
  )
    {
      if (errno == EBADFD)
        fd_kill (EV_A_ fd);
      else
        syserr ("(libev) port_associate");
    } 
}

static void
port_poll (EV_P_ ev_tstamp timeout)
{
  int res, i;
  struct timespec ts;
  uint_t nget = 1;

  ts.tv_sec  = (time_t)timeout;
  ts.tv_nsec = (long)(timeout - (ev_tstamp)ts.tv_sec) * 1e9;
  res = port_getn (port_fd, port_events, port_eventmax, &nget, &ts);

  if (res < 0)
    { 
      if (errno != EINTR && errno != ETIME)
        syserr ("(libev) port_getn");

      return;
    } 

  for (i = 0; i < nget; ++i)
    {
      if (port_events [i].portev_source == PORT_SOURCE_FD)
        {
          int fd = port_events [i].portev_object;

          fd_event (
            EV_A_
            fd,
            (port_events [i].portev_events & (POLLOUT | POLLERR | POLLHUP) ? EV_WRITE : 0)
            | (port_events [i].portev_events & (POLLIN | POLLERR | POLLHUP) ? EV_READ : 0)
          );

          anfds [fd].events = 0; /* event received == disassociated */
          fd_change (EV_A_ fd); /* need to reify later */
        }
    }

  if (expect_false (nget == port_eventmax))
    {
      ev_free (port_events);
      port_eventmax = array_roundsize (port_event_t, port_eventmax << 1);
      port_events = (port_event_t *)ev_malloc (sizeof (port_event_t) * port_eventmax);
    }
}

static int
port_init (EV_P_ int flags)
{
  /* Initalize the kernel queue */
  if ((port_fd = port_create ()) < 0)
    return 0;

  fcntl (port_fd, F_SETFD, FD_CLOEXEC); /* not sure if necessary, hopefully doesn't hurt */

  method_fudge  = 1e-3; /* needed to compensate for port_getn returning early */
  method_modify = port_modify;
  method_poll   = port_poll;

  port_eventmax = 64; /* intiial number of events receivable per poll */
  port_events = (port_event_t *)ev_malloc (sizeof (port_event_t) * port_eventmax);

  return EVBACKEND_PORT;
}

static void
port_destroy (EV_P)
{
  close (port_fd);

  ev_free (port_events);
}

static void
port_fork (EV_P)
{
  close (port_fd);

  while ((port_fd = port_create ()) < 0)
    syserr ("(libev) port");

  fcntl (port_fd, F_SETFD, FD_CLOEXEC);

  /* re-register interest in fds */
  fd_rearm_all (EV_A);
}

Revision:	1.3
Committed:	Fri Nov 23 05:00:45 2007 UTC (16 years, 6 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.2:	+1 -1 lines
Log Message:	renamed METHODs to BACKENDs add ev_supported_backends and ev_recommended_backends functions.
#	User	Rev	Content
1	root	1.1	/*
2			* Copyright 2007 Marc Alexander Lehmann <libev@schmorp.de>
3			*
4			* Redistribution and use in source and binary forms, with or without
5			* modification, are permitted provided that the following conditions
6			* are met:
7			*
8			* 1. Redistributions of source code must retain the above copyright
9			* notice, this list of conditions and the following disclaimer.
10			* 2. Redistributions in binary form must reproduce the above copyright
11			* notice, this list of conditions and the following disclaimer in the
12			* documentation and/or other materials provided with the distribution.
13			*
14			* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
15			* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16			* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17			* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
18			* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
19			* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
20			* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
21			* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22			* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23			* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24			*/
25
26			#include <sys/types.h>
27			#include <sys/time.h>
28			#include <poll.h>
29			#include <port.h>
30			#include <string.h>
31			#include <errno.h>
32
33			static void
34			port_modify (EV_P_ int fd, int oev, int nev)
35			{
36			/* we need to reassociate no matter what, as closes are
37			* once more silently being discarded.
38			*/
39			if (!nev)
40			{
41			if (oev)
42			port_dissociate (port_fd, PORT_SOURCE_FD, fd);
43			}
44			else if (0 >
45			port_associate (
46			port_fd, PORT_SOURCE_FD, fd,
47			(nev & EV_READ ? POLLIN : 0)
48			\| (nev & EV_WRITE ? POLLOUT : 0),
49			0
50			)
51			)
52			{
53			if (errno == EBADFD)
54			fd_kill (EV_A_ fd);
55			else
56			syserr ("(libev) port_associate");
57			}
58			}
59
60			static void
61			port_poll (EV_P_ ev_tstamp timeout)
62			{
63			int res, i;
64			struct timespec ts;
65			uint_t nget = 1;
66
67			ts.tv_sec = (time_t)timeout;
68			ts.tv_nsec = (long)(timeout - (ev_tstamp)ts.tv_sec) * 1e9;
69			res = port_getn (port_fd, port_events, port_eventmax, &nget, &ts);
70
71			if (res < 0)
72			{
73			if (errno != EINTR && errno != ETIME)
74			syserr ("(libev) port_getn");
75
76			return;
77			}
78
79			for (i = 0; i < nget; ++i)
80			{
81			if (port_events [i].portev_source == PORT_SOURCE_FD)
82			{
83			int fd = port_events [i].portev_object;
84
85			fd_event (
86			EV_A_
87			fd,
88			(port_events [i].portev_events & (POLLOUT \| POLLERR \| POLLHUP) ? EV_WRITE : 0)
89			\| (port_events [i].portev_events & (POLLIN \| POLLERR \| POLLHUP) ? EV_READ : 0)
90			);
91
92			anfds [fd].events = 0; /* event received == disassociated */
93			fd_change (EV_A_ fd); /* need to reify later */
94			}
95			}
96
97			if (expect_false (nget == port_eventmax))
98			{
99			ev_free (port_events);
100			port_eventmax = array_roundsize (port_event_t, port_eventmax << 1);
101			port_events = (port_event_t )ev_malloc (sizeof (port_event_t) port_eventmax);
102			}
103			}
104
105			static int
106			port_init (EV_P_ int flags)
107			{
108			/* Initalize the kernel queue */
109			if ((port_fd = port_create ()) < 0)
110			return 0;
111
112			fcntl (port_fd, F_SETFD, FD_CLOEXEC); /* not sure if necessary, hopefully doesn't hurt */
113
114			method_fudge = 1e-3; /* needed to compensate for port_getn returning early */
115			method_modify = port_modify;
116			method_poll = port_poll;
117
118			port_eventmax = 64; /* intiial number of events receivable per poll */
119			port_events = (port_event_t )ev_malloc (sizeof (port_event_t) port_eventmax);
120
121	root	1.3	return EVBACKEND_PORT;
122	root	1.1	}
123
124			static void
125			port_destroy (EV_P)
126			{
127			close (port_fd);
128
129			ev_free (port_events);
130			}
131
132			static void
133			port_fork (EV_P)
134			{
135			close (port_fd);
136
137			while ((port_fd = port_create ()) < 0)
138			syserr ("(libev) port");
139
140			fcntl (port_fd, F_SETFD, FD_CLOEXEC);
141
142			/* re-register interest in fds */
143			fd_rearm_all (EV_A);
144			}
145