/* * libev select fd activity backend * * Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de> * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are * met: * * * Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * * Redistributions in binary form must reproduce the above * copyright notice, this list of conditions and the following * disclaimer in the documentation and/or other materials provided * with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ /* for unix systems */ #if WIN32 typedef unsigned int uint32_t; # ifndef EV_SELECT_USE_FD_SET # define EV_SELECT_USE_FD_SET 1 # endif #else # include <sys/select.h> # include <inttypes.h> #endif #if EV_SELECT_USE_WIN32_HANDLES # undef EV_SELECT_USE_FD_SET # define EV_SELECT_USE_FD_SET 1 #endif #include <string.h> static void select_modify (EV_P_ int fd, int oev, int nev) { if (oev == nev) return; #if EV_SELECT_USE_FD_SET # if EV_SELECT_USE_WIN32_HANDLES fd = _get_osfhandle (fd); if (fd < 0) return; # endif if (nev & EV_READ) FD_SET (fd, (struct fd_set *)vec_ri); else FD_CLR (fd, (struct fd_set *)vec_ri); if (nev & EV_WRITE) FD_SET (fd, (struct fd_set *)vec_wi); else FD_CLR (fd, (struct fd_set *)vec_wi); #else { int offs = fd >> 3; int mask = 1 << (fd & 7); if (vec_max < (fd >> 5) + 1) { int new_max = (fd >> 5) + 1; vec_ri = (unsigned char *)ev_realloc (vec_ri, new_max * 4); vec_ro = (unsigned char *)ev_realloc (vec_ro, new_max * 4); /* could free/malloc */ vec_wi = (unsigned char *)ev_realloc (vec_wi, new_max * 4); vec_wo = (unsigned char *)ev_realloc (vec_wo, new_max * 4); /* could free/malloc */ for (; vec_max < new_max; ++vec_max) ((uint32_t *)vec_ri)[vec_max] = ((uint32_t *)vec_wi)[vec_max] = 0; } vec_ri [offs] |= mask; if (!(nev & EV_READ)) vec_ri [offs] &= ~mask; vec_wi [offs] |= mask; if (!(nev & EV_WRITE)) vec_wi [offs] &= ~mask; } #endif } static void select_poll (EV_P_ ev_tstamp timeout) { int word, offs; struct timeval tv; int res; #if EV_SELECT_USE_FD_SET memcpy (vec_ro, vec_ri, sizeof (struct fd_set)); memcpy (vec_wo, vec_wi, sizeof (struct fd_set)); #else memcpy (vec_ro, vec_ri, vec_max * 4); memcpy (vec_wo, vec_wi, vec_max * 4); #endif tv.tv_sec = (long)timeout; tv.tv_usec = (long)((timeout - (ev_tstamp)tv.tv_sec) * 1e6); res = select (vec_max * 32, (fd_set *)vec_ro, (fd_set *)vec_wo, 0, &tv); if (res < 0) { #ifdef WIN32 if (errno == WSAEINTR ) errno = EINTR; if (errno == WSAENOTSOCK) errno = EBADF; #endif if (errno == EBADF) fd_ebadf (EV_A); else if (errno == ENOMEM && !syserr_cb) fd_enomem (EV_A); else if (errno != EINTR) syserr ("(libev) select"); return; } #if EV_SELECT_USE_FD_SET # if EV_SELECT_USE_WIN32_HANDLES for (word = 0; word < anfdmax; ++word) { if (!anfd [word].events) { int fd = _get_osfhandle (word); if (fd >= 0) { int events = 0; if (FD_ISSET (fd, (struct fd_set *)vec_ro)) events |= EV_READ; if (FD_ISSET (fd, (struct fd_set *)vec_wo)) events |= EV_WRITE; if (events) fd_event (EV_A_ word, events); } } } # else for (word = 0; word < FD_SETSIZE; ++word) { int events = 0; if (FD_ISSET (word, (struct fd_set *)vec_ro)) events |= EV_READ; if (FD_ISSET (word, (struct fd_set *)vec_wo)) events |= EV_WRITE; if (events) fd_event (EV_A_ word, events); } # endif #else for (word = vec_max; word--; ) { if (((uint32_t *)vec_ro) [word] | ((uint32_t *)vec_wo) [word]) for (offs = 4; offs--; ) { int idx = word * 4 + offs; unsigned char byte_r = vec_ro [idx]; unsigned char byte_w = vec_wo [idx]; int bit; if (byte_r | byte_w) for (bit = 8; bit--; ) { int events = 0; events |= byte_r & (1 << bit) ? EV_READ : 0; events |= byte_w & (1 << bit) ? EV_WRITE : 0; if (events) fd_event (EV_A_ idx * 8 + bit, events); } } } #endif } static int select_init (EV_P_ int flags) { method_fudge = 1e-2; /* needed to compensate for select returning early, very conservative */ method_modify = select_modify; method_poll = select_poll; #if EV_SELECT_USE_FD_SET vec_max = FD_SETSIZE / 32; vec_ri = ev_malloc (sizeof (struct fd_set)); FD_ZERO ((struct fd_set *)vec_ri); vec_ro = ev_malloc (sizeof (struct fd_set)); vec_wi = ev_malloc (sizeof (struct fd_set)); FD_ZERO ((struct fd_set *)vec_wi); vec_wo = ev_malloc (sizeof (struct fd_set)); #else vec_max = 0; vec_ri = 0; vec_ri = 0; vec_wo = 0; vec_wo = 0; #endif return EVMETHOD_SELECT; } static void select_destroy (EV_P) { ev_free (vec_ri); ev_free (vec_ro); ev_free (vec_wi); ev_free (vec_wo); }