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/* |
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* libev poll fd activity backend |
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* |
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* Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de> |
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* All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without modifica- |
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* tion, are permitted provided that the following conditions are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright notice, |
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* this list of conditions and the following disclaimer. |
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* |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED |
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER- |
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* CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO |
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* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE- |
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* CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; |
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH- |
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* ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
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* OF THE POSSIBILITY OF SUCH DAMAGE. |
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* |
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* Alternatively, the contents of this file may be used under the terms of |
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* the GNU General Public License ("GPL") version 2 or any later version, |
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* in which case the provisions of the GPL are applicable instead of |
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* the above. If you wish to allow the use of your version of this file |
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* only under the terms of the GPL and not to allow others to use your |
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* version of this file under the BSD license, indicate your decision |
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* by deleting the provisions above and replace them with the notice |
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* and other provisions required by the GPL. If you do not delete the |
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* provisions above, a recipient may use your version of this file under |
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* either the BSD or the GPL. |
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*/ |
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|
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#include <poll.h> |
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|
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void inline_size |
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pollidx_init (int *base, int count) |
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{ |
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while (count--) |
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*base++ = -1; |
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} |
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|
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static void |
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poll_modify (EV_P_ int fd, int oev, int nev) |
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{ |
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int idx; |
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|
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if (oev == nev) |
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return; |
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|
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array_needsize (int, pollidxs, pollidxmax, fd + 1, pollidx_init); |
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|
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idx = pollidxs [fd]; |
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|
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if (idx < 0) /* need to allocate a new pollfd */ |
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{ |
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pollidxs [fd] = idx = pollcnt++; |
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array_needsize (struct pollfd, polls, pollmax, pollcnt, EMPTY2); |
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polls [idx].fd = fd; |
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} |
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|
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assert (polls [idx].fd == fd); |
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|
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if (nev) |
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polls [idx].events = |
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(nev & EV_READ ? POLLIN : 0) |
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| (nev & EV_WRITE ? POLLOUT : 0); |
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else /* remove pollfd */ |
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{ |
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pollidxs [fd] = -1; |
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|
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if (expect_true (idx < --pollcnt)) |
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{ |
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polls [idx] = polls [pollcnt]; |
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pollidxs [polls [idx].fd] = idx; |
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} |
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} |
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} |
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|
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static void |
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poll_poll (EV_P_ ev_tstamp timeout) |
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{ |
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int i; |
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int res = poll (polls, pollcnt, (int)ceil (timeout * 1000.)); |
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|
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if (expect_false (res < 0)) |
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{ |
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if (errno == EBADF) |
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fd_ebadf (EV_A); |
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else if (errno == ENOMEM && !syserr_cb) |
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fd_enomem (EV_A); |
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else if (errno != EINTR) |
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syserr ("(libev) poll"); |
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|
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return; |
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} |
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|
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for (i = 0; i < pollcnt; ++i) |
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if (expect_false (polls [i].revents & POLLNVAL)) |
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fd_kill (EV_A_ polls [i].fd); |
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else |
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fd_event ( |
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EV_A_ |
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polls [i].fd, |
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(polls [i].revents & (POLLOUT | POLLERR | POLLHUP) ? EV_WRITE : 0) |
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| (polls [i].revents & (POLLIN | POLLERR | POLLHUP) ? EV_READ : 0) |
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); |
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} |
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|
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int inline_size |
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poll_init (EV_P_ int flags) |
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{ |
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backend_fudge = 0.; /* posix says this is zero */ |
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backend_modify = poll_modify; |
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backend_poll = poll_poll; |
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|
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pollidxs = 0; pollidxmax = 0; |
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polls = 0; pollmax = 0; pollcnt = 0; |
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|
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return EVBACKEND_POLL; |
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} |
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|
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void inline_size |
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poll_destroy (EV_P) |
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{ |
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ev_free (pollidxs); |
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ev_free (polls); |
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} |
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|