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: |
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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 |
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11 | * notice, this list of conditions and the following disclaimer in the |
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12 | * documentation and/or other materials provided with the distribution. |
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13 | * 3. The name of the author may not be used to endorse or promote products |
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14 | * derived from this software without specific prior written permission. |
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15 | * |
9 | * |
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10 | * 1. Redistributions of source code must retain the above copyright notice, |
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11 | * this list of conditions and the following disclaimer. |
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12 | * |
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13 | * 2. Redistributions in binary form must reproduce the above copyright |
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14 | * notice, this list of conditions and the following disclaimer in the |
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15 | * documentation and/or other materials provided with the distribution. |
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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. |
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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 | * https://archive.is/jN6Ck (random results) |
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43 | * https://archive.is/bBikp (just totally broken) |
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44 | * https://archive.is/eJhmu (manpage ETIME) |
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45 | * https://archive.is/RbgYw (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) |
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> |
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57 | |
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58 | inline_speed |
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59 | void |
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60 | port_associate_and_check (EV_P_ int fd, int ev) |
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61 | { |
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62 | if (0 > |
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63 | port_associate ( |
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64 | backend_fd, PORT_SOURCE_FD, fd, |
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65 | (ev & EV_READ ? POLLIN : 0) |
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66 | | (ev & EV_WRITE ? POLLOUT : 0), |
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67 | 0 |
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68 | ) |
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69 | ) |
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70 | { |
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71 | if (errno == EBADFD) |
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72 | { |
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73 | assert (("libev: port_associate found invalid fd", errno != EBADFD)); |
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74 | fd_kill (EV_A_ fd); |
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75 | } |
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76 | else |
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77 | ev_syserr ("(libev) port_associate"); |
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78 | } |
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79 | } |
34 | |
80 | |
35 | static void |
81 | static void |
36 | port_modify (EV_P_ int fd, int oev, int nev) |
82 | port_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 > |
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47 | port_associate ( |
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48 | port_fd, PORT_SOURCE_FD, fd, |
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49 | (nev & EV_READ ? POLLIN : 0) |
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50 | | (nev & EV_WRITE ? POLLOUT : 0), |
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51 | 0 |
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52 | ) |
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53 | ) |
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54 | { |
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55 | if (errno == EBADFD) |
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56 | fd_kill (EV_A_ fd); |
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57 | else |
92 | else |
58 | syserr ("(libev) port_associate"); |
93 | port_associate_and_check (EV_A_ fd, nev); |
59 | } |
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60 | } |
94 | } |
61 | |
95 | |
62 | static void |
96 | static void |
63 | port_poll (EV_P_ ev_tstamp timeout) |
97 | port_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 :/ */ |
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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 */ |
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115 | if (res == -1 && errno != ETIME && errno != EINTR) |
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116 | ev_syserr ("(libev) port_getn (see https://archive.is/jN6Ck, 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 */ |
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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 | |
107 | static int |
143 | inline_size |
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144 | int |
108 | port_init (EV_P_ int flags) |
145 | port_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; |
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118 | method_poll = port_poll; |
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119 | |
154 | |
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155 | /* if my reading of the opensolaris kernel sources are correct, then |
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156 | * opensolaris does something very stupid: it checks if the time has already |
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157 | * elapsed and doesn't round up if that is the case, otherwise it DOES round |
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158 | * up. Since we can't know what the case is, we need to guess by using a |
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159 | * "large enough" timeout. Normally, 1e-9 would be correct. |
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160 | */ |
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161 | backend_mintime = EV_TS_CONST (1e-3); /* needed to compensate for port_getn returning early */ |
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162 | backend_modify = port_modify; |
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163 | backend_poll = port_poll; |
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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 | |
126 | static void |
171 | inline_size |
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172 | void |
127 | port_destroy (EV_P) |
173 | port_destroy (EV_P) |
128 | { |
174 | { |
129 | close (port_fd); |
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130 | |
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131 | ev_free (port_events); |
175 | ev_free (port_events); |
132 | } |
176 | } |
133 | |
177 | |
134 | static void |
178 | inline_size |
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179 | void |
135 | port_fork (EV_P) |
180 | port_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 | |