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Comparing libev/ev_port.c (file contents):
Revision 1.22 by root, Sat Oct 16 00:59:56 2010 UTC vs.
Revision 1.29 by root, Thu Feb 18 04:48:05 2016 UTC

1/* 1/*
2 * libev solaris event port backend 2 * libev solaris event port backend
3 * 3 *
4 * Copyright (c) 2007,2008,2009,2010 Marc Alexander Lehmann <libev@schmorp.de> 4 * Copyright (c) 2007,2008,2009,2010,2011 Marc Alexander Lehmann <libev@schmorp.de>
5 * All rights reserved. 5 * All rights reserved.
6 * 6 *
7 * Redistribution and use in source and binary forms, with or without modifica- 7 * Redistribution and use in source and binary forms, with or without modifica-
8 * tion, are permitted provided that the following conditions are met: 8 * tion, are permitted provided that the following conditions are met:
9 * 9 *
10 * 1. Redistributions of source code must retain the above copyright notice, 10 * 1. Redistributions of source code must retain the above copyright notice,
11 * this list of conditions and the following disclaimer. 11 * this list of conditions and the following disclaimer.
12 * 12 *
13 * 2. Redistributions in binary form must reproduce the above copyright 13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the 14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution. 15 * documentation and/or other materials provided with the distribution.
16 * 16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED 17 * 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- 18 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
19 * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO 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- 20 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
21 * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 21 * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
… …
35 * and other provisions required by the GPL. If you do not delete the 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 36 * provisions above, a recipient may use your version of this file under
37 * either the BSD or the GPL. 37 * either the BSD or the GPL.
38 */ 38 */
39 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)
49 */
50
40#include <sys/types.h> 51#include <sys/types.h>
41#include <sys/time.h> 52#include <sys/time.h>
42#include <poll.h> 53#include <poll.h>
43#include <port.h> 54#include <port.h>
44#include <string.h> 55#include <string.h>
45#include <errno.h> 56#include <errno.h>
46 57
47void inline_speed 58inline_speed
59void
48port_associate_and_check (EV_P_ int fd, int ev) 60port_associate_and_check (EV_P_ int fd, int ev)
49{ 61{
50 if (0 > 62 if (0 >
51 port_associate ( 63 port_associate (
52 backend_fd, PORT_SOURCE_FD, fd, 64 backend_fd, PORT_SOURCE_FD, fd,
… …
83{ 95{
84 int res, i; 96 int res, i;
85 struct timespec ts; 97 struct timespec ts;
86 uint_t nget = 1; 98 uint_t nget = 1;
87 99
100 /* we initialise this to something we will skip in the loop, as */
101 /* port_getn can return with nget unchanged, but no indication */
102 /* whether it was the original value or has been updated :/ */
103 port_events [0].portev_source = 0;
104
88 EV_RELEASE_CB; 105 EV_RELEASE_CB;
89 EV_TS_SET (ts, timeout); 106 EV_TS_SET (ts, timeout);
90 res = port_getn (backend_fd, port_events, port_eventmax, &nget, &ts); 107 res = port_getn (backend_fd, port_events, port_eventmax, &nget, &ts);
91 EV_ACQUIRE_CB; 108 EV_ACQUIRE_CB;
92 109
93 if (res == -1) 110 /* port_getn may or may not set nget on error */
94 { 111 /* so we rely on port_events [0].portev_source not being updated */
95 if (errno != EINTR && errno != ETIME) 112 if (res == -1 && errno != ETIME && errno != EINTR)
96 ev_syserr ("(libev) port_getn (see http://bugs.opensolaris.org/view_bug.do?bug_id=6268715, try LIBEV_FLAGS=3 env variable)"); 113 ev_syserr ("(libev) port_getn (see http://bugs.opensolaris.org/view_bug.do?bug_id=6268715, try LIBEV_FLAGS=3 env variable)");
97
98 return;
99 }
100 114
101 for (i = 0; i < nget; ++i) 115 for (i = 0; i < nget; ++i)
102 { 116 {
103 if (port_events [i].portev_source == PORT_SOURCE_FD) 117 if (port_events [i].portev_source == PORT_SOURCE_FD)
104 { 118 {
… …
121 port_eventmax = array_nextsize (sizeof (port_event_t), port_eventmax, port_eventmax + 1); 135 port_eventmax = array_nextsize (sizeof (port_event_t), port_eventmax, port_eventmax + 1);
122 port_events = (port_event_t *)ev_malloc (sizeof (port_event_t) * port_eventmax); 136 port_events = (port_event_t *)ev_malloc (sizeof (port_event_t) * port_eventmax);
123 } 137 }
124} 138}
125 139
126int inline_size 140inline_size
141int
127port_init (EV_P_ int flags) 142port_init (EV_P_ int flags)
128{ 143{
129 /* Initialize the kernel queue */ 144 /* Initialize the kernel queue */
130 if ((backend_fd = port_create ()) < 0) 145 if ((backend_fd = port_create ()) < 0)
131 return 0; 146 return 0;
132 147
148 assert (("libev: PORT_SOURCE_FD must not be zero", PORT_SOURCE_FD));
149
133 fcntl (backend_fd, F_SETFD, FD_CLOEXEC); /* not sure if necessary, hopefully doesn't hurt */ 150 fcntl (backend_fd, F_SETFD, FD_CLOEXEC); /* not sure if necessary, hopefully doesn't hurt */
134 151
152 /* if my reading of the opensolaris kernel sources are correct, then
153 * opensolaris does something very stupid: it checks if the time has already
154 * elapsed and doesn't round up if that is the case,m otherwise it DOES round
155 * up. Since we can't know what the case is, we need to guess by using a
156 * "large enough" timeout. Normally, 1e-9 would be correct.
157 */
135 backend_fudge = 1e-3; /* needed to compensate for port_getn returning early */ 158 backend_mintime = 1e-3; /* needed to compensate for port_getn returning early */
136 backend_modify = port_modify; 159 backend_modify = port_modify;
137 backend_poll = port_poll; 160 backend_poll = port_poll;
138 161
139 port_eventmax = 64; /* initial number of events receivable per poll */ 162 port_eventmax = 64; /* initial number of events receivable per poll */
140 port_events = (port_event_t *)ev_malloc (sizeof (port_event_t) * port_eventmax); 163 port_events = (port_event_t *)ev_malloc (sizeof (port_event_t) * port_eventmax);
141 164
142 return EVBACKEND_PORT; 165 return EVBACKEND_PORT;
143} 166}
144 167
145void inline_size 168inline_size
169void
146port_destroy (EV_P) 170port_destroy (EV_P)
147{ 171{
148 ev_free (port_events); 172 ev_free (port_events);
149} 173}
150 174
151void inline_size 175inline_size
176void
152port_fork (EV_P) 177port_fork (EV_P)
153{ 178{
154 close (backend_fd); 179 close (backend_fd);
155 180
156 while ((backend_fd = port_create ()) < 0) 181 while ((backend_fd = port_create ()) < 0)

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