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Comparing libev/ev_port.c (file contents):
Revision 1.10 by root, Tue Dec 25 07:05:45 2007 UTC vs.
Revision 1.32 by root, Sun Jul 7 06:00:32 2019 UTC

1/* 1/*
2 * libev solaris event port backend 2 * libev solaris event port backend
3 * 3 *
4 * Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de> 4 * Copyright (c) 2007,2008,2009,2010,2011,2019 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,
… …
55 0 67 0
56 ) 68 )
57 ) 69 )
58 { 70 {
59 if (errno == EBADFD) 71 if (errno == EBADFD)
72 {
73 assert (("libev: port_associate found invalid fd", errno != EBADFD);
60 fd_kill (EV_A_ fd); 74 fd_kill (EV_A_ fd);
75 }
61 else 76 else
62 syserr ("(libev) port_associate"); 77 ev_syserr ("(libev) port_associate");
63 } 78 }
64} 79}
65 80
66static void 81static void
67port_modify (EV_P_ int fd, int oev, int nev) 82port_modify (EV_P_ int fd, int oev, int nev)
… …
83{ 98{
84 int res, i; 99 int res, i;
85 struct timespec ts; 100 struct timespec ts;
86 uint_t nget = 1; 101 uint_t nget = 1;
87 102
88 ts.tv_sec = (time_t)timeout; 103 /* we initialise this to something we will skip in the loop, as */
89 ts.tv_nsec = (long)(timeout - (ev_tstamp)ts.tv_sec) * 1e9; 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 EV_RELEASE_CB;
109 EV_TS_SET (ts, timeout);
90 res = port_getn (backend_fd, port_events, port_eventmax, &nget, &ts); 110 res = port_getn (backend_fd, port_events, port_eventmax, &nget, &ts);
111 EV_ACQUIRE_CB;
91 112
92 if (res < 0) 113 /* port_getn may or may not set nget on error */
93 { 114 /* so we rely on port_events [0].portev_source not being updated */
94 if (errno != EINTR && errno != ETIME) 115 if (res == -1 && errno != ETIME && errno != EINTR)
95 syserr ("(libev) port_getn"); 116 ev_syserr ("(libev) port_getn (see http://bugs.opensolaris.org/view_bug.do?bug_id=6268715, try LIBEV_FLAGS=3 env variable)");
96
97 return;
98 }
99 117
100 for (i = 0; i < nget; ++i) 118 for (i = 0; i < nget; ++i)
101 { 119 {
102 if (port_events [i].portev_source == PORT_SOURCE_FD) 120 if (port_events [i].portev_source == PORT_SOURCE_FD)
103 { 121 {
… …
108 fd, 126 fd,
109 (port_events [i].portev_events & (POLLOUT | POLLERR | POLLHUP) ? EV_WRITE : 0) 127 (port_events [i].portev_events & (POLLOUT | POLLERR | POLLHUP) ? EV_WRITE : 0)
110 | (port_events [i].portev_events & (POLLIN | POLLERR | POLLHUP) ? EV_READ : 0) 128 | (port_events [i].portev_events & (POLLIN | POLLERR | POLLHUP) ? EV_READ : 0)
111 ); 129 );
112 130
113 port_associate_and_check (EV_A_ fd, anfds [fd].events); 131 fd_change (EV_A_ fd, EV__IOFDSET);
114 } 132 }
115 } 133 }
116 134
117 if (expect_false (nget == port_eventmax)) 135 if (ecb_expect_false (nget == port_eventmax))
118 { 136 {
119 ev_free (port_events); 137 ev_free (port_events);
120 port_eventmax = array_nextsize (sizeof (port_event_t), port_eventmax, port_eventmax + 1); 138 port_eventmax = array_nextsize (sizeof (port_event_t), port_eventmax, port_eventmax + 1);
121 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);
122 } 140 }
123} 141}
124 142
125int inline_size 143inline_size
144int
126port_init (EV_P_ int flags) 145port_init (EV_P_ int flags)
127{ 146{
128 /* Initalize the kernel queue */ 147 /* Initialize the kernel queue */
129 if ((backend_fd = port_create ()) < 0) 148 if ((backend_fd = port_create ()) < 0)
130 return 0; 149 return 0;
131 150
151 assert (("libev: PORT_SOURCE_FD must not be zero", PORT_SOURCE_FD));
152
132 fcntl (backend_fd, F_SETFD, FD_CLOEXEC); /* not sure if necessary, hopefully doesn't hurt */ 153 fcntl (backend_fd, F_SETFD, FD_CLOEXEC); /* not sure if necessary, hopefully doesn't hurt */
133 154
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 */
134 backend_fudge = 1e-3; /* needed to compensate for port_getn returning early */ 161 backend_mintime = 1e-3; /* needed to compensate for port_getn returning early */
135 backend_modify = port_modify; 162 backend_modify = port_modify;
136 backend_poll = port_poll; 163 backend_poll = port_poll;
137 164
138 port_eventmax = 64; /* intiial number of events receivable per poll */ 165 port_eventmax = 64; /* initial number of events receivable per poll */
139 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);
140 167
141 return EVBACKEND_PORT; 168 return EVBACKEND_PORT;
142} 169}
143 170
144void inline_size 171inline_size
172void
145port_destroy (EV_P) 173port_destroy (EV_P)
146{ 174{
147 ev_free (port_events); 175 ev_free (port_events);
148} 176}
149 177
150void inline_size 178inline_size
179void
151port_fork (EV_P) 180port_fork (EV_P)
152{ 181{
153 close (backend_fd); 182 close (backend_fd);
154 183
155 while ((backend_fd = port_create ()) < 0) 184 while ((backend_fd = port_create ()) < 0)
156 syserr ("(libev) port"); 185 ev_syserr ("(libev) port");
157 186
158 fcntl (backend_fd, F_SETFD, FD_CLOEXEC); 187 fcntl (backend_fd, F_SETFD, FD_CLOEXEC);
159 188
160 /* re-register interest in fds */ 189 /* re-register interest in fds */
161 fd_rearm_all (EV_A); 190 fd_rearm_all (EV_A);

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