/* $NetBSD: win32select.c,v 1.1.1.4 2021/04/07 02:43:14 christos Exp $ */ /* * Copyright 2007-2012 Niels Provos and Nick Mathewson * Copyright 2000-2007 Niels Provos * Copyright 2003 Michael A. Davis * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. 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. * 3. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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. */ #include "event2/event-config.h" #include __RCSID("$NetBSD: win32select.c,v 1.1.1.4 2021/04/07 02:43:14 christos Exp $"); #include "evconfig-private.h" #ifdef _WIN32 #include #include #include #include #include #include #include #include #include #include #include "event2/util.h" #include "util-internal.h" #include "log-internal.h" #include "event2/event.h" #include "event-internal.h" #include "evmap-internal.h" #include "event2/thread.h" #include "evthread-internal.h" #include "time-internal.h" #define XFREE(ptr) do { if (ptr) mm_free(ptr); } while (0) extern struct event_list timequeue; extern struct event_list addqueue; struct win_fd_set { unsigned int fd_count; SOCKET fd_array[1]; }; /* MSDN says this is required to handle SIGFPE */ volatile double SIGFPE_REQ = 0.0f; struct idx_info { int read_pos_plus1; int write_pos_plus1; }; struct win32op { unsigned num_fds_in_fd_sets; int resize_out_sets; struct win_fd_set *readset_in; struct win_fd_set *writeset_in; struct win_fd_set *readset_out; struct win_fd_set *writeset_out; struct win_fd_set *exset_out; unsigned signals_are_broken : 1; }; static void *win32_init(struct event_base *); static int win32_add(struct event_base *, evutil_socket_t, short old, short events, void *idx_); static int win32_del(struct event_base *, evutil_socket_t, short old, short events, void *idx_); static int win32_dispatch(struct event_base *base, struct timeval *); static void win32_dealloc(struct event_base *); struct eventop win32ops = { "win32", win32_init, win32_add, win32_del, win32_dispatch, win32_dealloc, 0, /* doesn't need reinit */ 0, /* No features supported. */ sizeof(struct idx_info), }; #define FD_SET_ALLOC_SIZE(n) ((sizeof(struct win_fd_set) + ((n)-1)*sizeof(SOCKET))) static int grow_fd_sets(struct win32op *op, unsigned new_num_fds) { size_t size; EVUTIL_ASSERT(new_num_fds >= op->readset_in->fd_count && new_num_fds >= op->writeset_in->fd_count); EVUTIL_ASSERT(new_num_fds >= 1); size = FD_SET_ALLOC_SIZE(new_num_fds); if (!(op->readset_in = mm_realloc(op->readset_in, size))) return (-1); if (!(op->writeset_in = mm_realloc(op->writeset_in, size))) return (-1); op->resize_out_sets = 1; op->num_fds_in_fd_sets = new_num_fds; return (0); } static int do_fd_set(struct win32op *op, struct idx_info *ent, evutil_socket_t s, int read) { struct win_fd_set *set = read ? op->readset_in : op->writeset_in; if (read) { if (ent->read_pos_plus1 > 0) return (0); } else { if (ent->write_pos_plus1 > 0) return (0); } if (set->fd_count == op->num_fds_in_fd_sets) { if (grow_fd_sets(op, op->num_fds_in_fd_sets*2)) return (-1); /* set pointer will have changed and needs reiniting! */ set = read ? op->readset_in : op->writeset_in; } set->fd_array[set->fd_count] = s; if (read) ent->read_pos_plus1 = set->fd_count+1; else ent->write_pos_plus1 = set->fd_count+1; return (set->fd_count++); } static int do_fd_clear(struct event_base *base, struct win32op *op, struct idx_info *ent, int read) { int i; struct win_fd_set *set = read ? op->readset_in : op->writeset_in; if (read) { i = ent->read_pos_plus1 - 1; ent->read_pos_plus1 = 0; } else { i = ent->write_pos_plus1 - 1; ent->write_pos_plus1 = 0; } if (i < 0) return (0); if (--set->fd_count != (unsigned)i) { struct idx_info *ent2; SOCKET s2; s2 = set->fd_array[i] = set->fd_array[set->fd_count]; ent2 = evmap_io_get_fdinfo_(&base->io, s2); if (!ent2) /* This indicates a bug. */ return (0); if (read) ent2->read_pos_plus1 = i+1; else ent2->write_pos_plus1 = i+1; } return (0); } #define NEVENT 32 void * win32_init(struct event_base *base) { struct win32op *winop; size_t size; if (!(winop = mm_calloc(1, sizeof(struct win32op)))) return NULL; winop->num_fds_in_fd_sets = NEVENT; size = FD_SET_ALLOC_SIZE(NEVENT); if (!(winop->readset_in = mm_malloc(size))) goto err; if (!(winop->writeset_in = mm_malloc(size))) goto err; if (!(winop->readset_out = mm_malloc(size))) goto err; if (!(winop->writeset_out = mm_malloc(size))) goto err; if (!(winop->exset_out = mm_malloc(size))) goto err; winop->readset_in->fd_count = winop->writeset_in->fd_count = 0; winop->readset_out->fd_count = winop->writeset_out->fd_count = winop->exset_out->fd_count = 0; if (evsig_init_(base) < 0) winop->signals_are_broken = 1; evutil_weakrand_seed_(&base->weakrand_seed, 0); return (winop); err: XFREE(winop->readset_in); XFREE(winop->writeset_in); XFREE(winop->readset_out); XFREE(winop->writeset_out); XFREE(winop->exset_out); XFREE(winop); return (NULL); } int win32_add(struct event_base *base, evutil_socket_t fd, short old, short events, void *idx_) { struct win32op *win32op = base->evbase; struct idx_info *idx = idx_; if ((events & EV_SIGNAL) && win32op->signals_are_broken) return (-1); if (!(events & (EV_READ|EV_WRITE))) return (0); event_debug(("%s: adding event for %d", __func__, (int)fd)); if (events & EV_READ) { if (do_fd_set(win32op, idx, fd, 1)<0) return (-1); } if (events & EV_WRITE) { if (do_fd_set(win32op, idx, fd, 0)<0) return (-1); } return (0); } int win32_del(struct event_base *base, evutil_socket_t fd, short old, short events, void *idx_) { struct win32op *win32op = base->evbase; struct idx_info *idx = idx_; event_debug(("%s: Removing event for "EV_SOCK_FMT, __func__, EV_SOCK_ARG(fd))); if (events & EV_READ) do_fd_clear(base, win32op, idx, 1); if (events & EV_WRITE) do_fd_clear(base, win32op, idx, 0); return 0; } static void fd_set_copy(struct win_fd_set *out, const struct win_fd_set *in) { out->fd_count = in->fd_count; memcpy(out->fd_array, in->fd_array, in->fd_count * (sizeof(SOCKET))); } /* static void dump_fd_set(struct win_fd_set *s) { unsigned int i; printf("[ "); for(i=0;ifd_count;++i) printf("%d ",(int)s->fd_array[i]); printf("]\n"); } */ int win32_dispatch(struct event_base *base, struct timeval *tv) { struct win32op *win32op = base->evbase; int res = 0; unsigned j, i; int fd_count; SOCKET s; if (win32op->resize_out_sets) { size_t size = FD_SET_ALLOC_SIZE(win32op->num_fds_in_fd_sets); if (!(win32op->readset_out = mm_realloc(win32op->readset_out, size))) return (-1); if (!(win32op->exset_out = mm_realloc(win32op->exset_out, size))) return (-1); if (!(win32op->writeset_out = mm_realloc(win32op->writeset_out, size))) return (-1); win32op->resize_out_sets = 0; } fd_set_copy(win32op->readset_out, win32op->readset_in); fd_set_copy(win32op->exset_out, win32op->writeset_in); fd_set_copy(win32op->writeset_out, win32op->writeset_in); fd_count = (win32op->readset_out->fd_count > win32op->writeset_out->fd_count) ? win32op->readset_out->fd_count : win32op->writeset_out->fd_count; if (!fd_count) { long msec = tv ? evutil_tv_to_msec_(tv) : LONG_MAX; /* Sleep's DWORD argument is unsigned long */ if (msec < 0) msec = LONG_MAX; /* Windows doesn't like you to call select() with no sockets */ Sleep(msec); return (0); } EVBASE_RELEASE_LOCK(base, th_base_lock); res = select(fd_count, (struct fd_set*)win32op->readset_out, (struct fd_set*)win32op->writeset_out, (struct fd_set*)win32op->exset_out, tv); EVBASE_ACQUIRE_LOCK(base, th_base_lock); event_debug(("%s: select returned %d", __func__, res)); if (res <= 0) { event_debug(("%s: %s", __func__, evutil_socket_error_to_string(EVUTIL_SOCKET_ERROR()))); return res; } if (win32op->readset_out->fd_count) { i = evutil_weakrand_range_(&base->weakrand_seed, win32op->readset_out->fd_count); for (j=0; jreadset_out->fd_count; ++j) { if (++i >= win32op->readset_out->fd_count) i = 0; s = win32op->readset_out->fd_array[i]; evmap_io_active_(base, s, EV_READ); } } if (win32op->exset_out->fd_count) { i = evutil_weakrand_range_(&base->weakrand_seed, win32op->exset_out->fd_count); for (j=0; jexset_out->fd_count; ++j) { if (++i >= win32op->exset_out->fd_count) i = 0; s = win32op->exset_out->fd_array[i]; evmap_io_active_(base, s, EV_WRITE); } } if (win32op->writeset_out->fd_count) { i = evutil_weakrand_range_(&base->weakrand_seed, win32op->writeset_out->fd_count); for (j=0; jwriteset_out->fd_count; ++j) { if (++i >= win32op->writeset_out->fd_count) i = 0; s = win32op->writeset_out->fd_array[i]; evmap_io_active_(base, s, EV_WRITE); } } return (0); } void win32_dealloc(struct event_base *base) { struct win32op *win32op = base->evbase; evsig_dealloc_(base); if (win32op->readset_in) mm_free(win32op->readset_in); if (win32op->writeset_in) mm_free(win32op->writeset_in); if (win32op->readset_out) mm_free(win32op->readset_out); if (win32op->writeset_out) mm_free(win32op->writeset_out); if (win32op->exset_out) mm_free(win32op->exset_out); /* XXXXX free the tree. */ memset(win32op, 0, sizeof(*win32op)); mm_free(win32op); } #endif