Mirror of :pserver:anonymous@cvs.schmorp.de/schmorpforge libev http://software.schmorp.de/pkg/libev.html
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  1. /*
  2. * libev solaris event port backend
  3. *
  4. * Copyright (c) 2007,2008,2009,2010,2011,2019 Marc Alexander Lehmann <libev@schmorp.de>
  5. * All rights reserved.
  6. *
  7. * Redistribution and use in source and binary forms, with or without modifica-
  8. * tion, are permitted provided that the following conditions are met:
  9. *
  10. * 1. Redistributions of source code must retain the above copyright notice,
  11. * this list of conditions and the following disclaimer.
  12. *
  13. * 2. Redistributions in binary form must reproduce the above copyright
  14. * notice, this list of conditions and the following disclaimer in the
  15. * documentation and/or other materials provided with the distribution.
  16. *
  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-
  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-
  21. * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  22. * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
  23. * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  24. * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
  25. * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  26. * OF THE POSSIBILITY OF SUCH DAMAGE.
  27. *
  28. * Alternatively, the contents of this file may be used under the terms of
  29. * the GNU General Public License ("GPL") version 2 or any later version,
  30. * in which case the provisions of the GPL are applicable instead of
  31. * the above. If you wish to allow the use of your version of this file
  32. * only under the terms of the GPL and not to allow others to use your
  33. * version of this file under the BSD license, indicate your decision
  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
  36. * provisions above, a recipient may use your version of this file under
  37. * either the BSD or the GPL.
  38. */
  39. /* useful reading:
  40. *
  41. * http://bugs.opensolaris.org/view_bug.do?bug_id=6268715 (random results)
  42. * http://bugs.opensolaris.org/view_bug.do?bug_id=6455223 (just totally broken)
  43. * http://bugs.opensolaris.org/view_bug.do?bug_id=6873782 (manpage ETIME)
  44. * http://bugs.opensolaris.org/view_bug.do?bug_id=6874410 (implementation ETIME)
  45. * http://www.mail-archive.com/networking-discuss@opensolaris.org/msg11898.html ETIME vs. nget
  46. * http://src.opensolaris.org/source/xref/onnv/onnv-gate/usr/src/lib/libc/port/gen/event_port.c (libc)
  47. * http://cvs.opensolaris.org/source/xref/onnv/onnv-gate/usr/src/uts/common/fs/portfs/port.c#1325 (kernel)
  48. */
  49. #include <sys/types.h>
  50. #include <sys/time.h>
  51. #include <poll.h>
  52. #include <port.h>
  53. #include <string.h>
  54. #include <errno.h>
  55. inline_speed
  56. void
  57. port_associate_and_check (EV_P_ int fd, int ev)
  58. {
  59. if (0 >
  60. port_associate (
  61. backend_fd, PORT_SOURCE_FD, fd,
  62. (ev & EV_READ ? POLLIN : 0)
  63. | (ev & EV_WRITE ? POLLOUT : 0),
  64. 0
  65. )
  66. )
  67. {
  68. if (errno == EBADFD)
  69. {
  70. assert (("libev: port_associate found invalid fd", errno != EBADFD));
  71. fd_kill (EV_A_ fd);
  72. }
  73. else
  74. ev_syserr ("(libev) port_associate");
  75. }
  76. }
  77. static void
  78. port_modify (EV_P_ int fd, int oev, int nev)
  79. {
  80. /* we need to reassociate no matter what, as closes are
  81. * once more silently being discarded.
  82. */
  83. if (!nev)
  84. {
  85. if (oev)
  86. port_dissociate (backend_fd, PORT_SOURCE_FD, fd);
  87. }
  88. else
  89. port_associate_and_check (EV_A_ fd, nev);
  90. }
  91. static void
  92. port_poll (EV_P_ ev_tstamp timeout)
  93. {
  94. int res, i;
  95. struct timespec ts;
  96. uint_t nget = 1;
  97. /* we initialise this to something we will skip in the loop, as */
  98. /* port_getn can return with nget unchanged, but no indication */
  99. /* whether it was the original value or has been updated :/ */
  100. port_events [0].portev_source = 0;
  101. EV_RELEASE_CB;
  102. EV_TS_SET (ts, timeout);
  103. res = port_getn (backend_fd, port_events, port_eventmax, &nget, &ts);
  104. EV_ACQUIRE_CB;
  105. /* port_getn may or may not set nget on error */
  106. /* so we rely on port_events [0].portev_source not being updated */
  107. if (res == -1 && errno != ETIME && errno != EINTR)
  108. ev_syserr ("(libev) port_getn (see http://bugs.opensolaris.org/view_bug.do?bug_id=6268715, try LIBEV_FLAGS=3 env variable)");
  109. for (i = 0; i < nget; ++i)
  110. {
  111. if (port_events [i].portev_source == PORT_SOURCE_FD)
  112. {
  113. int fd = port_events [i].portev_object;
  114. fd_event (
  115. EV_A_
  116. fd,
  117. (port_events [i].portev_events & (POLLOUT | POLLERR | POLLHUP) ? EV_WRITE : 0)
  118. | (port_events [i].portev_events & (POLLIN | POLLERR | POLLHUP) ? EV_READ : 0)
  119. );
  120. fd_change (EV_A_ fd, EV__IOFDSET);
  121. }
  122. }
  123. if (ecb_expect_false (nget == port_eventmax))
  124. {
  125. ev_free (port_events);
  126. port_eventmax = array_nextsize (sizeof (port_event_t), port_eventmax, port_eventmax + 1);
  127. port_events = (port_event_t *)ev_malloc (sizeof (port_event_t) * port_eventmax);
  128. }
  129. }
  130. inline_size
  131. int
  132. port_init (EV_P_ int flags)
  133. {
  134. /* Initialize the kernel queue */
  135. if ((backend_fd = port_create ()) < 0)
  136. return 0;
  137. assert (("libev: PORT_SOURCE_FD must not be zero", PORT_SOURCE_FD));
  138. fcntl (backend_fd, F_SETFD, FD_CLOEXEC); /* not sure if necessary, hopefully doesn't hurt */
  139. /* if my reading of the opensolaris kernel sources are correct, then
  140. * opensolaris does something very stupid: it checks if the time has already
  141. * elapsed and doesn't round up if that is the case, otherwise it DOES round
  142. * up. Since we can't know what the case is, we need to guess by using a
  143. * "large enough" timeout. Normally, 1e-9 would be correct.
  144. */
  145. backend_mintime = EV_TS_CONST (1e-3); /* needed to compensate for port_getn returning early */
  146. backend_modify = port_modify;
  147. backend_poll = port_poll;
  148. port_eventmax = 64; /* initial number of events receivable per poll */
  149. port_events = (port_event_t *)ev_malloc (sizeof (port_event_t) * port_eventmax);
  150. return EVBACKEND_PORT;
  151. }
  152. inline_size
  153. void
  154. port_destroy (EV_P)
  155. {
  156. ev_free (port_events);
  157. }
  158. inline_size
  159. void
  160. port_fork (EV_P)
  161. {
  162. close (backend_fd);
  163. while ((backend_fd = port_create ()) < 0)
  164. ev_syserr ("(libev) port");
  165. fcntl (backend_fd, F_SETFD, FD_CLOEXEC);
  166. /* re-register interest in fds */
  167. fd_rearm_all (EV_A);
  168. }