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/cvs/libev/ev_port.c
Revision: 1.3
Committed: Fri Nov 23 05:00:45 2007 UTC (16 years, 5 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.

File Contents

# 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