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Revision: 1.34
Committed: Sat May 22 20:14:57 2021 UTC (3 years, 2 months ago) by root
Content type: text/plain
Branch: MAIN
CVS Tags: HEAD
Changes since 1.33: +5 -5 lines
Log Message:
replace soem urls

File Contents

# User Rev Content
1 root 1.1 /*
2 root 1.6 * libev solaris event port backend
3     *
4 root 1.30 * Copyright (c) 2007,2008,2009,2010,2011,2019 Marc Alexander Lehmann <libev@schmorp.de>
5 root 1.6 * All rights reserved.
6 root 1.1 *
7 root 1.10 * Redistribution and use in source and binary forms, with or without modifica-
8     * tion, are permitted provided that the following conditions are met:
9 root 1.26 *
10 root 1.10 * 1. Redistributions of source code must retain the above copyright notice,
11     * this list of conditions and the following disclaimer.
12 root 1.26 *
13 root 1.10 * 2. Redistributions in binary form must reproduce the above copyright
14     * notice, this list of conditions and the following disclaimer in the
15     * documentation and/or other materials provided with the distribution.
16 root 1.26 *
17 root 1.10 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
18     * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
19     * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
20     * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
21     * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
22     * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
23     * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
24     * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
25     * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
26     * OF THE POSSIBILITY OF SUCH DAMAGE.
27 root 1.6 *
28 root 1.10 * Alternatively, the contents of this file may be used under the terms of
29     * the GNU General Public License ("GPL") version 2 or any later version,
30     * in which case the provisions of the GPL are applicable instead of
31     * the above. If you wish to allow the use of your version of this file
32     * only under the terms of the GPL and not to allow others to use your
33     * version of this file under the BSD license, indicate your decision
34     * by deleting the provisions above and replace them with the notice
35     * and other provisions required by the GPL. If you do not delete the
36     * provisions above, a recipient may use your version of this file under
37     * either the BSD or the GPL.
38 root 1.1 */
39    
40 root 1.23 /* useful reading:
41     *
42 root 1.34 * https://archive.is/jN6Ck (random results)
43     * https://archive.is/bBikp (just totally broken)
44     * https://archive.is/eJhmu (manpage ETIME)
45     * https://archive.is/RbgYw (implementation ETIME)
46 root 1.23 * http://www.mail-archive.com/networking-discuss@opensolaris.org/msg11898.html ETIME vs. nget
47     * http://src.opensolaris.org/source/xref/onnv/onnv-gate/usr/src/lib/libc/port/gen/event_port.c (libc)
48     * http://cvs.opensolaris.org/source/xref/onnv/onnv-gate/usr/src/uts/common/fs/portfs/port.c#1325 (kernel)
49     */
50    
51 root 1.1 #include <sys/types.h>
52     #include <sys/time.h>
53     #include <poll.h>
54     #include <port.h>
55     #include <string.h>
56     #include <errno.h>
57    
58 root 1.29 inline_speed
59     void
60 root 1.9 port_associate_and_check (EV_P_ int fd, int ev)
61     {
62     if (0 >
63     port_associate (
64     backend_fd, PORT_SOURCE_FD, fd,
65     (ev & EV_READ ? POLLIN : 0)
66     | (ev & EV_WRITE ? POLLOUT : 0),
67     0
68     )
69     )
70     {
71     if (errno == EBADFD)
72 root 1.30 {
73 root 1.33 assert (("libev: port_associate found invalid fd", errno != EBADFD));
74 root 1.30 fd_kill (EV_A_ fd);
75     }
76 root 1.9 else
77 root 1.12 ev_syserr ("(libev) port_associate");
78 root 1.9 }
79     }
80    
81 root 1.1 static void
82     port_modify (EV_P_ int fd, int oev, int nev)
83     {
84     /* we need to reassociate no matter what, as closes are
85     * once more silently being discarded.
86     */
87     if (!nev)
88     {
89     if (oev)
90 root 1.5 port_dissociate (backend_fd, PORT_SOURCE_FD, fd);
91 root 1.1 }
92 root 1.9 else
93     port_associate_and_check (EV_A_ fd, nev);
94 root 1.1 }
95    
96     static void
97     port_poll (EV_P_ ev_tstamp timeout)
98     {
99     int res, i;
100     struct timespec ts;
101     uint_t nget = 1;
102    
103 root 1.23 /* we initialise this to something we will skip in the loop, as */
104     /* port_getn can return with nget unchanged, but no indication */
105     /* whether it was the original value or has been updated :/ */
106     port_events [0].portev_source = 0;
107    
108 root 1.16 EV_RELEASE_CB;
109 root 1.21 EV_TS_SET (ts, timeout);
110 root 1.5 res = port_getn (backend_fd, port_events, port_eventmax, &nget, &ts);
111 root 1.16 EV_ACQUIRE_CB;
112 root 1.1
113 root 1.23 /* port_getn may or may not set nget on error */
114     /* so we rely on port_events [0].portev_source not being updated */
115     if (res == -1 && errno != ETIME && errno != EINTR)
116 root 1.34 ev_syserr ("(libev) port_getn (see https://archive.is/jN6Ck, try LIBEV_FLAGS=3 env variable)");
117 root 1.1
118     for (i = 0; i < nget; ++i)
119     {
120     if (port_events [i].portev_source == PORT_SOURCE_FD)
121     {
122     int fd = port_events [i].portev_object;
123    
124     fd_event (
125     EV_A_
126     fd,
127     (port_events [i].portev_events & (POLLOUT | POLLERR | POLLHUP) ? EV_WRITE : 0)
128     | (port_events [i].portev_events & (POLLIN | POLLERR | POLLHUP) ? EV_READ : 0)
129     );
130    
131 root 1.22 fd_change (EV_A_ fd, EV__IOFDSET);
132 root 1.1 }
133     }
134    
135 root 1.31 if (ecb_expect_false (nget == port_eventmax))
136 root 1.1 {
137     ev_free (port_events);
138 root 1.8 port_eventmax = array_nextsize (sizeof (port_event_t), port_eventmax, port_eventmax + 1);
139 root 1.1 port_events = (port_event_t *)ev_malloc (sizeof (port_event_t) * port_eventmax);
140     }
141     }
142    
143 root 1.29 inline_size
144     int
145 root 1.1 port_init (EV_P_ int flags)
146     {
147 sf-exg 1.19 /* Initialize the kernel queue */
148 root 1.5 if ((backend_fd = port_create ()) < 0)
149 root 1.1 return 0;
150    
151 root 1.24 assert (("libev: PORT_SOURCE_FD must not be zero", PORT_SOURCE_FD));
152 root 1.23
153 root 1.5 fcntl (backend_fd, F_SETFD, FD_CLOEXEC); /* not sure if necessary, hopefully doesn't hurt */
154 root 1.1
155 root 1.27 /* if my reading of the opensolaris kernel sources are correct, then
156     * opensolaris does something very stupid: it checks if the time has already
157 root 1.32 * elapsed and doesn't round up if that is the case, otherwise it DOES round
158 root 1.27 * up. Since we can't know what the case is, we need to guess by using a
159     * "large enough" timeout. Normally, 1e-9 would be correct.
160     */
161 root 1.33 backend_mintime = EV_TS_CONST (1e-3); /* needed to compensate for port_getn returning early */
162 root 1.28 backend_modify = port_modify;
163     backend_poll = port_poll;
164 root 1.1
165 sf-exg 1.19 port_eventmax = 64; /* initial number of events receivable per poll */
166 root 1.1 port_events = (port_event_t *)ev_malloc (sizeof (port_event_t) * port_eventmax);
167    
168 root 1.3 return EVBACKEND_PORT;
169 root 1.1 }
170    
171 root 1.29 inline_size
172     void
173 root 1.1 port_destroy (EV_P)
174     {
175     ev_free (port_events);
176     }
177    
178 root 1.29 inline_size
179     void
180 root 1.1 port_fork (EV_P)
181     {
182 root 1.5 close (backend_fd);
183 root 1.1
184 root 1.5 while ((backend_fd = port_create ()) < 0)
185 root 1.12 ev_syserr ("(libev) port");
186 root 1.1
187 root 1.5 fcntl (backend_fd, F_SETFD, FD_CLOEXEC);
188 root 1.1
189     /* re-register interest in fds */
190     fd_rearm_all (EV_A);
191     }
192