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Comparing libev/ev_port.c (file contents):
Revision 1.1 by root, Fri Nov 16 01:33:54 2007 UTC vs.
Revision 1.32 by root, Sun Jul 7 06:00:32 2019 UTC

1/* 1/*
2 * Copyright 2007 Marc Alexander Lehmann <libev@schmorp.de> 2 * libev solaris event port backend
3 * 3 *
4 * Redistribution and use in source and binary forms, with or without 4 * Copyright (c) 2007,2008,2009,2010,2011,2019 Marc Alexander Lehmann <libev@schmorp.de>
5 * modification, are permitted provided that the following conditions 5 * All rights reserved.
6 * are met:
7 * 6 *
8 * 1. Redistributions of source code must retain the above copyright 7 * Redistribution and use in source and binary forms, with or without modifica-
9 * notice, this list of conditions and the following disclaimer. 8 * tion, are permitted provided that the following conditions are met:
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 * 3. The name of the author may not be used to endorse or promote products
14 * derived from this software without specific prior written permission.
15 * 9 *
10 * 1. Redistributions of source code must retain the above copyright notice,
11 * this list of conditions and the following disclaimer.
12 *
13 * 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 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 * OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * 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 */
39
40/* useful reading:
41 *
42 * http://bugs.opensolaris.org/view_bug.do?bug_id=6268715 (random results)
43 * http://bugs.opensolaris.org/view_bug.do?bug_id=6455223 (just totally broken)
44 * http://bugs.opensolaris.org/view_bug.do?bug_id=6873782 (manpage ETIME)
45 * http://bugs.opensolaris.org/view_bug.do?bug_id=6874410 (implementation ETIME)
46 * 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)
26 */ 49 */
27 50
28#include <sys/types.h> 51#include <sys/types.h>
29#include <sys/time.h> 52#include <sys/time.h>
30#include <poll.h> 53#include <poll.h>
31#include <port.h> 54#include <port.h>
32#include <string.h> 55#include <string.h>
33#include <errno.h> 56#include <errno.h>
57
58inline_speed
59void
60port_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 {
73 assert (("libev: port_associate found invalid fd", errno != EBADFD);
74 fd_kill (EV_A_ fd);
75 }
76 else
77 ev_syserr ("(libev) port_associate");
78 }
79}
34 80
35static void 81static void
36port_modify (EV_P_ int fd, int oev, int nev) 82port_modify (EV_P_ int fd, int oev, int nev)
37{ 83{
38 /* we need to reassociate no matter what, as closes are 84 /* we need to reassociate no matter what, as closes are
39 * once more silently being discarded. 85 * once more silently being discarded.
40 */ 86 */
41 if (!nev) 87 if (!nev)
42 { 88 {
43 if (oev) 89 if (oev)
44 port_dissociate (port_fd, PORT_SOURCE_FD, fd); 90 port_dissociate (backend_fd, PORT_SOURCE_FD, fd);
45 } 91 }
46 else if (0 >
47 port_associate (
48 port_fd, PORT_SOURCE_FD, fd,
49 (nev & EV_READ ? POLLIN : 0)
50 | (nev & EV_WRITE ? POLLOUT : 0),
51 0
52 )
53 )
54 {
55 if (errno == EBADFD)
56 fd_kill (EV_A_ fd);
57 else 92 else
58 syserr ("(libev) port_associate"); 93 port_associate_and_check (EV_A_ fd, nev);
59 }
60} 94}
61 95
62static void 96static void
63port_poll (EV_P_ ev_tstamp timeout) 97port_poll (EV_P_ ev_tstamp timeout)
64{ 98{
65 int res, i; 99 int res, i;
66 struct timespec ts; 100 struct timespec ts;
67 uint_t nget = 1; 101 uint_t nget = 1;
68 102
69 ts.tv_sec = (time_t)timeout; 103 /* we initialise this to something we will skip in the loop, as */
70 ts.tv_nsec = (long)(timeout - (ev_tstamp)ts.tv_sec) * 1e9; 104 /* port_getn can return with nget unchanged, but no indication */
71 res = port_getn (port_fd, port_events, port_eventmax, &nget, &ts); 105 /* whether it was the original value or has been updated :/ */
106 port_events [0].portev_source = 0;
72 107
73 if (res < 0) 108 EV_RELEASE_CB;
74 { 109 EV_TS_SET (ts, timeout);
75 if (errno != EINTR && errno != ETIME) 110 res = port_getn (backend_fd, port_events, port_eventmax, &nget, &ts);
76 syserr ("(libev) port_getn"); 111 EV_ACQUIRE_CB;
77 112
78 return; 113 /* port_getn may or may not set nget on error */
79 } 114 /* so we rely on port_events [0].portev_source not being updated */
115 if (res == -1 && errno != ETIME && errno != EINTR)
116 ev_syserr ("(libev) port_getn (see http://bugs.opensolaris.org/view_bug.do?bug_id=6268715, try LIBEV_FLAGS=3 env variable)");
80 117
81 for (i = 0; i < nget; ++i) 118 for (i = 0; i < nget; ++i)
82 { 119 {
83 if (port_events [i].portev_source == PORT_SOURCE_FD) 120 if (port_events [i].portev_source == PORT_SOURCE_FD)
84 { 121 {
… …
89 fd, 126 fd,
90 (port_events [i].portev_events & (POLLOUT | POLLERR | POLLHUP) ? EV_WRITE : 0) 127 (port_events [i].portev_events & (POLLOUT | POLLERR | POLLHUP) ? EV_WRITE : 0)
91 | (port_events [i].portev_events & (POLLIN | POLLERR | POLLHUP) ? EV_READ : 0) 128 | (port_events [i].portev_events & (POLLIN | POLLERR | POLLHUP) ? EV_READ : 0)
92 ); 129 );
93 130
94 anfds [fd].events = 0; /* event received == disassociated */ 131 fd_change (EV_A_ fd, EV__IOFDSET);
95 fd_change (EV_A_ fd); /* need to reify later */
96 } 132 }
97 } 133 }
98 134
99 if (expect_false (nget == port_eventmax)) 135 if (ecb_expect_false (nget == port_eventmax))
100 { 136 {
101 ev_free (port_events); 137 ev_free (port_events);
102 port_eventmax = array_roundsize (port_event_t, port_eventmax << 1); 138 port_eventmax = array_nextsize (sizeof (port_event_t), port_eventmax, port_eventmax + 1);
103 port_events = (port_event_t *)ev_malloc (sizeof (port_event_t) * port_eventmax); 139 port_events = (port_event_t *)ev_malloc (sizeof (port_event_t) * port_eventmax);
104 } 140 }
105} 141}
106 142
107static int 143inline_size
144int
108port_init (EV_P_ int flags) 145port_init (EV_P_ int flags)
109{ 146{
110 /* Initalize the kernel queue */ 147 /* Initialize the kernel queue */
111 if ((port_fd = port_create ()) < 0) 148 if ((backend_fd = port_create ()) < 0)
112 return 0; 149 return 0;
113 150
114 fcntl (port_fd, F_SETFD, FD_CLOEXEC); /* not sure if necessary, hopefully doesn't hurt */ 151 assert (("libev: PORT_SOURCE_FD must not be zero", PORT_SOURCE_FD));
115 152
116 method_fudge = 1e-3; /* needed to compensate for port_getn returning early */ 153 fcntl (backend_fd, F_SETFD, FD_CLOEXEC); /* not sure if necessary, hopefully doesn't hurt */
117 method_modify = port_modify;
118 method_poll = port_poll;
119 154
155 /* 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 * elapsed and doesn't round up if that is the case, otherwise it DOES round
158 * 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 backend_mintime = 1e-3; /* needed to compensate for port_getn returning early */
162 backend_modify = port_modify;
163 backend_poll = port_poll;
164
120 port_eventmax = 64; /* intiial number of events receivable per poll */ 165 port_eventmax = 64; /* initial number of events receivable per poll */
121 port_events = (port_event_t *)ev_malloc (sizeof (port_event_t) * port_eventmax); 166 port_events = (port_event_t *)ev_malloc (sizeof (port_event_t) * port_eventmax);
122 167
123 return EVMETHOD_PORT; 168 return EVBACKEND_PORT;
124} 169}
125 170
126static void 171inline_size
172void
127port_destroy (EV_P) 173port_destroy (EV_P)
128{ 174{
129 close (port_fd);
130
131 ev_free (port_events); 175 ev_free (port_events);
132} 176}
133 177
134static void 178inline_size
179void
135port_fork (EV_P) 180port_fork (EV_P)
136{ 181{
137 close (port_fd); 182 close (backend_fd);
138 183
139 while ((port_fd = port_create ()) < 0) 184 while ((backend_fd = port_create ()) < 0)
140 syserr ("(libev) port"); 185 ev_syserr ("(libev) port");
141 186
142 fcntl (port_fd, F_SETFD, FD_CLOEXEC); 187 fcntl (backend_fd, F_SETFD, FD_CLOEXEC);
143 188
144 /* re-register interest in fds */ 189 /* re-register interest in fds */
145 fd_rearm_all (EV_A); 190 fd_rearm_all (EV_A);
146} 191}
147 192

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