1 | /* |
1 | /* |
2 | * libev solaris event port backend |
2 | * libev solaris event port backend |
3 | * |
3 | * |
4 | * Copyright (c) 2007,2008,2009 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, |
… | |
… | |
33 | * version of this file under the BSD license, indicate your decision |
33 | * version of this file under the BSD license, indicate your decision |
34 | * by deleting the provisions above and replace them with the notice |
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 |
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 | */ |
|
|
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) |
38 | */ |
49 | */ |
39 | |
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> |
… | |
… | |
83 | { |
94 | { |
84 | int res, i; |
95 | int res, i; |
85 | struct timespec ts; |
96 | struct timespec ts; |
86 | uint_t nget = 1; |
97 | uint_t nget = 1; |
87 | |
98 | |
|
|
99 | /* we initialise this to something we will skip in the loop, as */ |
|
|
100 | /* port_getn can return with nget unchanged, but no indication */ |
|
|
101 | /* whether it was the original value or has been updated :/ */ |
|
|
102 | port_events [0].portev_source = 0; |
|
|
103 | |
88 | EV_RELEASE_CB; |
104 | EV_RELEASE_CB; |
89 | EV_TS_SET (ts, timeout); |
105 | EV_TS_SET (ts, timeout); |
90 | res = port_getn (backend_fd, port_events, port_eventmax, &nget, &ts); |
106 | res = port_getn (backend_fd, port_events, port_eventmax, &nget, &ts); |
91 | EV_ACQUIRE_CB; |
107 | EV_ACQUIRE_CB; |
92 | |
108 | |
93 | if (res == -1) |
109 | /* port_getn may or may not set nget on error */ |
94 | { |
110 | /* so we rely on port_events [0].portev_source not being updated */ |
95 | if (errno != EINTR && errno != ETIME) |
111 | 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)"); |
112 | 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 | |
113 | |
101 | for (i = 0; i < nget; ++i) |
114 | for (i = 0; i < nget; ++i) |
102 | { |
115 | { |
103 | if (port_events [i].portev_source == PORT_SOURCE_FD) |
116 | if (port_events [i].portev_source == PORT_SOURCE_FD) |
104 | { |
117 | { |
… | |
… | |
109 | fd, |
122 | fd, |
110 | (port_events [i].portev_events & (POLLOUT | POLLERR | POLLHUP) ? EV_WRITE : 0) |
123 | (port_events [i].portev_events & (POLLOUT | POLLERR | POLLHUP) ? EV_WRITE : 0) |
111 | | (port_events [i].portev_events & (POLLIN | POLLERR | POLLHUP) ? EV_READ : 0) |
124 | | (port_events [i].portev_events & (POLLIN | POLLERR | POLLHUP) ? EV_READ : 0) |
112 | ); |
125 | ); |
113 | |
126 | |
114 | port_associate_and_check (EV_A_ fd, anfds [fd].events); |
127 | fd_change (EV_A_ fd, EV__IOFDSET); |
115 | } |
128 | } |
116 | } |
129 | } |
117 | |
130 | |
118 | if (expect_false (nget == port_eventmax)) |
131 | if (expect_false (nget == port_eventmax)) |
119 | { |
132 | { |
… | |
… | |
128 | { |
141 | { |
129 | /* Initialize the kernel queue */ |
142 | /* Initialize the kernel queue */ |
130 | if ((backend_fd = port_create ()) < 0) |
143 | if ((backend_fd = port_create ()) < 0) |
131 | return 0; |
144 | return 0; |
132 | |
145 | |
|
|
146 | assert (("libev: PORT_SOURCE_FD must not be zero", PORT_SOURCE_FD)); |
|
|
147 | |
133 | fcntl (backend_fd, F_SETFD, FD_CLOEXEC); /* not sure if necessary, hopefully doesn't hurt */ |
148 | fcntl (backend_fd, F_SETFD, FD_CLOEXEC); /* not sure if necessary, hopefully doesn't hurt */ |
134 | |
149 | |
|
|
150 | /* if my reading of the opensolaris kernel sources are correct, then |
|
|
151 | * opensolaris does something very stupid: it checks if the time has already |
|
|
152 | * elapsed and doesn't round up if that is the case,m otherwise it DOES round |
|
|
153 | * up. Since we can't know what the case is, we need to guess by using a |
|
|
154 | * "large enough" timeout. Normally, 1e-9 would be correct. |
|
|
155 | */ |
135 | backend_fudge = 1e-3; /* needed to compensate for port_getn returning early */ |
156 | backend_fudge = 1e-3; /* needed to compensate for port_getn returning early */ |
136 | backend_modify = port_modify; |
157 | backend_modify = port_modify; |
137 | backend_poll = port_poll; |
158 | backend_poll = port_poll; |
138 | |
159 | |
139 | port_eventmax = 64; /* initial number of events receivable per poll */ |
160 | port_eventmax = 64; /* initial number of events receivable per poll */ |