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314 lines
8.6 KiB
314 lines
8.6 KiB
/*
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* libev select fd activity backend
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*
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* Copyright (c) 2007,2008,2009,2010,2011 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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#ifndef _WIN32
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/* for unix systems */
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# include <inttypes.h>
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# ifndef __hpux
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/* for REAL unix systems */
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# include <sys/select.h>
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# endif
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#endif
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#ifndef EV_SELECT_USE_FD_SET
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# ifdef NFDBITS
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# define EV_SELECT_USE_FD_SET 0
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# else
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# define EV_SELECT_USE_FD_SET 1
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# endif
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#endif
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#if EV_SELECT_IS_WINSOCKET
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# undef EV_SELECT_USE_FD_SET
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# define EV_SELECT_USE_FD_SET 1
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# undef NFDBITS
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# define NFDBITS 0
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#endif
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#if !EV_SELECT_USE_FD_SET
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# define NFDBYTES (NFDBITS / 8)
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#endif
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#include <string.h>
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static void
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select_modify (EV_P_ int fd, int oev, int nev)
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{
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if (oev == nev)
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return;
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{
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#if EV_SELECT_USE_FD_SET
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#if EV_SELECT_IS_WINSOCKET
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SOCKET handle = anfds [fd].handle;
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#else
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int handle = fd;
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#endif
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assert (("libev: fd >= FD_SETSIZE passed to fd_set-based select backend", fd < FD_SETSIZE));
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/* FD_SET is broken on windows (it adds the fd to a set twice or more,
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* which eventually leads to overflows). Need to call it only on changes.
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*/
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#if EV_SELECT_IS_WINSOCKET
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if ((oev ^ nev) & EV_READ)
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#endif
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if (nev & EV_READ)
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FD_SET (handle, (fd_set *)vec_ri);
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else
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FD_CLR (handle, (fd_set *)vec_ri);
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#if EV_SELECT_IS_WINSOCKET
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if ((oev ^ nev) & EV_WRITE)
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#endif
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if (nev & EV_WRITE)
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FD_SET (handle, (fd_set *)vec_wi);
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else
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FD_CLR (handle, (fd_set *)vec_wi);
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#else
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int word = fd / NFDBITS;
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fd_mask mask = 1UL << (fd % NFDBITS);
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if (expect_false (vec_max <= word))
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{
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int new_max = word + 1;
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vec_ri = ev_realloc (vec_ri, new_max * NFDBYTES);
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vec_ro = ev_realloc (vec_ro, new_max * NFDBYTES); /* could free/malloc */
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vec_wi = ev_realloc (vec_wi, new_max * NFDBYTES);
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vec_wo = ev_realloc (vec_wo, new_max * NFDBYTES); /* could free/malloc */
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#ifdef _WIN32
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vec_eo = ev_realloc (vec_eo, new_max * NFDBYTES); /* could free/malloc */
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#endif
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for (; vec_max < new_max; ++vec_max)
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((fd_mask *)vec_ri) [vec_max] =
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((fd_mask *)vec_wi) [vec_max] = 0;
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}
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((fd_mask *)vec_ri) [word] |= mask;
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if (!(nev & EV_READ))
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((fd_mask *)vec_ri) [word] &= ~mask;
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((fd_mask *)vec_wi) [word] |= mask;
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if (!(nev & EV_WRITE))
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((fd_mask *)vec_wi) [word] &= ~mask;
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#endif
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}
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}
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static void
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select_poll (EV_P_ ev_tstamp timeout)
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{
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struct timeval tv;
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int res;
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int fd_setsize;
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EV_RELEASE_CB;
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EV_TV_SET (tv, timeout);
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#if EV_SELECT_USE_FD_SET
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fd_setsize = sizeof (fd_set);
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#else
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fd_setsize = vec_max * NFDBYTES;
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#endif
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memcpy (vec_ro, vec_ri, fd_setsize);
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memcpy (vec_wo, vec_wi, fd_setsize);
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#ifdef _WIN32
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/* pass in the write set as except set.
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* the idea behind this is to work around a windows bug that causes
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* errors to be reported as an exception and not by setting
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* the writable bit. this is so uncontrollably lame.
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*/
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memcpy (vec_eo, vec_wi, fd_setsize);
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res = select (vec_max * NFDBITS, (fd_set *)vec_ro, (fd_set *)vec_wo, (fd_set *)vec_eo, &tv);
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#elif EV_SELECT_USE_FD_SET
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fd_setsize = anfdmax < FD_SETSIZE ? anfdmax : FD_SETSIZE;
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res = select (fd_setsize, (fd_set *)vec_ro, (fd_set *)vec_wo, 0, &tv);
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#else
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res = select (vec_max * NFDBITS, (fd_set *)vec_ro, (fd_set *)vec_wo, 0, &tv);
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#endif
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EV_ACQUIRE_CB;
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if (expect_false (res < 0))
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{
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#if EV_SELECT_IS_WINSOCKET
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errno = WSAGetLastError ();
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#endif
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#ifdef WSABASEERR
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/* on windows, select returns incompatible error codes, fix this */
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if (errno >= WSABASEERR && errno < WSABASEERR + 1000)
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if (errno == WSAENOTSOCK)
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errno = EBADF;
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else
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errno -= WSABASEERR;
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#endif
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#ifdef _WIN32
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/* select on windows erroneously returns EINVAL when no fd sets have been
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* provided (this is documented). what microsoft doesn't tell you that this bug
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* exists even when the fd sets _are_ provided, so we have to check for this bug
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* here and emulate by sleeping manually.
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* we also get EINVAL when the timeout is invalid, but we ignore this case here
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* and assume that EINVAL always means: you have to wait manually.
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*/
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if (errno == EINVAL)
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{
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if (timeout)
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{
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unsigned long ms = timeout * 1e3;
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Sleep (ms ? ms : 1);
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}
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return;
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}
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#endif
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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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ev_syserr ("(libev) select");
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return;
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}
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#if EV_SELECT_USE_FD_SET
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{
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int fd;
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for (fd = 0; fd < anfdmax; ++fd)
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if (anfds [fd].events)
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{
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int events = 0;
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#if EV_SELECT_IS_WINSOCKET
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SOCKET handle = anfds [fd].handle;
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#else
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int handle = fd;
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#endif
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if (FD_ISSET (handle, (fd_set *)vec_ro)) events |= EV_READ;
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if (FD_ISSET (handle, (fd_set *)vec_wo)) events |= EV_WRITE;
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#ifdef _WIN32
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if (FD_ISSET (handle, (fd_set *)vec_eo)) events |= EV_WRITE;
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#endif
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if (expect_true (events))
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fd_event (EV_A_ fd, events);
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}
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}
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#else
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{
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int word, bit;
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for (word = vec_max; word--; )
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{
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fd_mask word_r = ((fd_mask *)vec_ro) [word];
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fd_mask word_w = ((fd_mask *)vec_wo) [word];
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#ifdef _WIN32
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word_w |= ((fd_mask *)vec_eo) [word];
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#endif
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if (word_r || word_w)
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for (bit = NFDBITS; bit--; )
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{
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fd_mask mask = 1UL << bit;
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int events = 0;
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events |= word_r & mask ? EV_READ : 0;
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events |= word_w & mask ? EV_WRITE : 0;
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if (expect_true (events))
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fd_event (EV_A_ word * NFDBITS + bit, events);
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}
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}
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}
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#endif
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}
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int inline_size
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select_init (EV_P_ int flags)
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{
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backend_mintime = 1e-6;
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backend_modify = select_modify;
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backend_poll = select_poll;
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#if EV_SELECT_USE_FD_SET
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vec_ri = ev_malloc (sizeof (fd_set)); FD_ZERO ((fd_set *)vec_ri);
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vec_ro = ev_malloc (sizeof (fd_set));
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vec_wi = ev_malloc (sizeof (fd_set)); FD_ZERO ((fd_set *)vec_wi);
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vec_wo = ev_malloc (sizeof (fd_set));
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#ifdef _WIN32
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vec_eo = ev_malloc (sizeof (fd_set));
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#endif
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#else
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vec_max = 0;
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vec_ri = 0;
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vec_ro = 0;
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vec_wi = 0;
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vec_wo = 0;
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#ifdef _WIN32
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vec_eo = 0;
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#endif
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#endif
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return EVBACKEND_SELECT;
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}
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void inline_size
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select_destroy (EV_P)
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{
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ev_free (vec_ri);
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ev_free (vec_ro);
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ev_free (vec_wi);
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ev_free (vec_wo);
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#ifdef _WIN32
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ev_free (vec_eo);
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#endif
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}
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