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 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 |
7 | * Redistribution and use in source and binary forms, with or without modifica- |
8 | * modification, are permitted provided that the following conditions are |
8 | * tion, are permitted provided that the following conditions are met: |
9 | * met: |
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10 | * |
9 | * |
11 | * * Redistributions of source code must retain the above copyright |
10 | * 1. Redistributions of source code must retain the above copyright notice, |
12 | * notice, this list of conditions and the following disclaimer. |
11 | * this list of conditions and the following disclaimer. |
13 | * |
12 | * |
14 | * * Redistributions in binary form must reproduce the above |
13 | * 2. Redistributions in binary form must reproduce the above copyright |
15 | * copyright notice, this list of conditions and the following |
14 | * notice, this list of conditions and the following disclaimer in the |
16 | * disclaimer in the documentation and/or other materials provided |
15 | * documentation and/or other materials provided with the distribution. |
17 | * with the distribution. |
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18 | * |
16 | * |
19 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED |
20 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
18 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER- |
21 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
19 | * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO |
22 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
20 | * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE- |
23 | * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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24 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
21 | * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
25 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
22 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; |
26 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
23 | * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
27 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
24 | * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH- |
28 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
25 | * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
29 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
26 | * OF THE POSSIBILITY OF SUCH DAMAGE. |
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27 | * |
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28 | * Alternatively, the contents of this file may be used under the terms of |
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29 | * the GNU General Public License ("GPL") version 2 or any later version, |
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30 | * in which case the provisions of the GPL are applicable instead of |
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31 | * the above. If you wish to allow the use of your version of this file |
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32 | * only under the terms of the GPL and not to allow others to use your |
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33 | * version of this file under the BSD license, indicate your decision |
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34 | * by deleting the provisions above and replace them with the notice |
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35 | * and other provisions required by the GPL. If you do not delete the |
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36 | * provisions above, a recipient may use your version of this file under |
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37 | * either the BSD or the GPL. |
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38 | */ |
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39 | |
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40 | /* useful reading: |
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41 | * |
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42 | * http://bugs.opensolaris.org/view_bug.do?bug_id=6268715 (random results) |
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43 | * http://bugs.opensolaris.org/view_bug.do?bug_id=6455223 (just totally broken) |
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44 | * http://bugs.opensolaris.org/view_bug.do?bug_id=6873782 (manpage ETIME) |
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45 | * http://bugs.opensolaris.org/view_bug.do?bug_id=6874410 (implementation ETIME) |
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46 | * http://www.mail-archive.com/networking-discuss@opensolaris.org/msg11898.html ETIME vs. nget |
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47 | * http://src.opensolaris.org/source/xref/onnv/onnv-gate/usr/src/lib/libc/port/gen/event_port.c (libc) |
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48 | * http://cvs.opensolaris.org/source/xref/onnv/onnv-gate/usr/src/uts/common/fs/portfs/port.c#1325 (kernel) |
30 | */ |
49 | */ |
31 | |
50 | |
32 | #include <sys/types.h> |
51 | #include <sys/types.h> |
33 | #include <sys/time.h> |
52 | #include <sys/time.h> |
34 | #include <poll.h> |
53 | #include <poll.h> |
35 | #include <port.h> |
54 | #include <port.h> |
36 | #include <string.h> |
55 | #include <string.h> |
37 | #include <errno.h> |
56 | #include <errno.h> |
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57 | |
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58 | void inline_speed |
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59 | port_associate_and_check (EV_P_ int fd, int ev) |
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60 | { |
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61 | if (0 > |
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62 | port_associate ( |
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63 | backend_fd, PORT_SOURCE_FD, fd, |
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64 | (ev & EV_READ ? POLLIN : 0) |
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65 | | (ev & EV_WRITE ? POLLOUT : 0), |
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66 | 0 |
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67 | ) |
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68 | ) |
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69 | { |
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70 | if (errno == EBADFD) |
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71 | fd_kill (EV_A_ fd); |
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72 | else |
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73 | ev_syserr ("(libev) port_associate"); |
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74 | } |
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75 | } |
38 | |
76 | |
39 | static void |
77 | static void |
40 | port_modify (EV_P_ int fd, int oev, int nev) |
78 | port_modify (EV_P_ int fd, int oev, int nev) |
41 | { |
79 | { |
42 | /* we need to reassociate no matter what, as closes are |
80 | /* we need to reassociate no matter what, as closes are |
… | |
… | |
45 | if (!nev) |
83 | if (!nev) |
46 | { |
84 | { |
47 | if (oev) |
85 | if (oev) |
48 | port_dissociate (backend_fd, PORT_SOURCE_FD, fd); |
86 | port_dissociate (backend_fd, PORT_SOURCE_FD, fd); |
49 | } |
87 | } |
50 | else if (0 > |
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51 | port_associate ( |
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52 | backend_fd, PORT_SOURCE_FD, fd, |
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53 | (nev & EV_READ ? POLLIN : 0) |
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54 | | (nev & EV_WRITE ? POLLOUT : 0), |
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55 | 0 |
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56 | ) |
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57 | ) |
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58 | { |
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59 | if (errno == EBADFD) |
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60 | fd_kill (EV_A_ fd); |
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61 | else |
88 | else |
62 | syserr ("(libev) port_associate"); |
89 | port_associate_and_check (EV_A_ fd, nev); |
63 | } |
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64 | } |
90 | } |
65 | |
91 | |
66 | static void |
92 | static void |
67 | port_poll (EV_P_ ev_tstamp timeout) |
93 | port_poll (EV_P_ ev_tstamp timeout) |
68 | { |
94 | { |
69 | int res, i; |
95 | int res, i; |
70 | struct timespec ts; |
96 | struct timespec ts; |
71 | uint_t nget = 1; |
97 | uint_t nget = 1; |
72 | |
98 | |
73 | ts.tv_sec = (time_t)timeout; |
99 | /* we initialise this to something we will skip in the loop, as */ |
74 | ts.tv_nsec = (long)(timeout - (ev_tstamp)ts.tv_sec) * 1e9; |
100 | /* port_getn can return with nget unchanged, but no indication */ |
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101 | /* whether it was the original value or has been updated :/ */ |
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102 | port_events [0].portev_source = 0; |
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103 | |
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104 | EV_RELEASE_CB; |
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105 | EV_TS_SET (ts, timeout); |
75 | res = port_getn (backend_fd, port_events, port_eventmax, &nget, &ts); |
106 | res = port_getn (backend_fd, port_events, port_eventmax, &nget, &ts); |
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107 | EV_ACQUIRE_CB; |
76 | |
108 | |
77 | if (res < 0) |
109 | /* port_getn may or may not set nget on error */ |
78 | { |
110 | /* so we rely on port_events [0].portev_source not being updated */ |
79 | if (errno != EINTR && errno != ETIME) |
111 | if (res == -1 && errno != ETIME && errno != EINTR) |
80 | syserr ("(libev) port_getn"); |
112 | ev_syserr ("(libev) port_getn (see http://bugs.opensolaris.org/view_bug.do?bug_id=6268715, try LIBEV_FLAGS=3 env variable)"); |
81 | |
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82 | return; |
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83 | } |
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84 | |
113 | |
85 | for (i = 0; i < nget; ++i) |
114 | for (i = 0; i < nget; ++i) |
86 | { |
115 | { |
87 | if (port_events [i].portev_source == PORT_SOURCE_FD) |
116 | if (port_events [i].portev_source == PORT_SOURCE_FD) |
88 | { |
117 | { |
… | |
… | |
93 | fd, |
122 | fd, |
94 | (port_events [i].portev_events & (POLLOUT | POLLERR | POLLHUP) ? EV_WRITE : 0) |
123 | (port_events [i].portev_events & (POLLOUT | POLLERR | POLLHUP) ? EV_WRITE : 0) |
95 | | (port_events [i].portev_events & (POLLIN | POLLERR | POLLHUP) ? EV_READ : 0) |
124 | | (port_events [i].portev_events & (POLLIN | POLLERR | POLLHUP) ? EV_READ : 0) |
96 | ); |
125 | ); |
97 | |
126 | |
98 | anfds [fd].events = 0; /* event received == disassociated */ |
127 | fd_change (EV_A_ fd, EV__IOFDSET); |
99 | fd_change (EV_A_ fd); /* need to reify later */ |
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100 | } |
128 | } |
101 | } |
129 | } |
102 | |
130 | |
103 | if (expect_false (nget == port_eventmax)) |
131 | if (expect_false (nget == port_eventmax)) |
104 | { |
132 | { |
105 | ev_free (port_events); |
133 | ev_free (port_events); |
106 | port_eventmax = array_roundsize (port_event_t, port_eventmax << 1); |
134 | port_eventmax = array_nextsize (sizeof (port_event_t), port_eventmax, port_eventmax + 1); |
107 | port_events = (port_event_t *)ev_malloc (sizeof (port_event_t) * port_eventmax); |
135 | port_events = (port_event_t *)ev_malloc (sizeof (port_event_t) * port_eventmax); |
108 | } |
136 | } |
109 | } |
137 | } |
110 | |
138 | |
111 | int inline_size |
139 | int inline_size |
112 | port_init (EV_P_ int flags) |
140 | port_init (EV_P_ int flags) |
113 | { |
141 | { |
114 | /* Initalize the kernel queue */ |
142 | /* Initialize the kernel queue */ |
115 | if ((backend_fd = port_create ()) < 0) |
143 | if ((backend_fd = port_create ()) < 0) |
116 | return 0; |
144 | return 0; |
117 | |
145 | |
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146 | assert (("libev: PORT_SOURCE_FD must not be zero", PORT_SOURCE_FD)); |
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147 | |
118 | 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 */ |
119 | |
149 | |
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150 | /* if my reading of the opensolaris kernel sources are correct, then |
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151 | * opensolaris does something very stupid: it checks if the time has already |
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152 | * elapsed and doesn't round up if that is the case,m otherwise it DOES round |
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153 | * up. Since we can't know what the case is, we need to guess by using a |
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154 | * "large enough" timeout. Normally, 1e-9 would be correct. |
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155 | */ |
120 | 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 */ |
121 | backend_modify = port_modify; |
157 | backend_modify = port_modify; |
122 | backend_poll = port_poll; |
158 | backend_poll = port_poll; |
123 | |
159 | |
124 | port_eventmax = 64; /* intiial number of events receivable per poll */ |
160 | port_eventmax = 64; /* initial number of events receivable per poll */ |
125 | port_events = (port_event_t *)ev_malloc (sizeof (port_event_t) * port_eventmax); |
161 | port_events = (port_event_t *)ev_malloc (sizeof (port_event_t) * port_eventmax); |
126 | |
162 | |
127 | return EVBACKEND_PORT; |
163 | return EVBACKEND_PORT; |
128 | } |
164 | } |
129 | |
165 | |
… | |
… | |
137 | port_fork (EV_P) |
173 | port_fork (EV_P) |
138 | { |
174 | { |
139 | close (backend_fd); |
175 | close (backend_fd); |
140 | |
176 | |
141 | while ((backend_fd = port_create ()) < 0) |
177 | while ((backend_fd = port_create ()) < 0) |
142 | syserr ("(libev) port"); |
178 | ev_syserr ("(libev) port"); |
143 | |
179 | |
144 | fcntl (backend_fd, F_SETFD, FD_CLOEXEC); |
180 | fcntl (backend_fd, F_SETFD, FD_CLOEXEC); |
145 | |
181 | |
146 | /* re-register interest in fds */ |
182 | /* re-register interest in fds */ |
147 | fd_rearm_all (EV_A); |
183 | fd_rearm_all (EV_A); |