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/*
* Copyright 2007-2012 Niels Provos and Nick Mathewson
* Copyright 2000-2007 Niels Provos <provos@citi.umich.edu>
* Copyright 2003 Michael A. Davis <mike@datanerds.net>
*
* 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 "evconfig-private.h"
#ifdef _WIN32
#include <winsock2.h>
#include <windows.h>
#include <sys/types.h>
#include <sys/queue.h>
#include <limits.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#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"
#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 {
u_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 %d", __func__, 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;i<s->fd_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 = evutil_tv_to_msec_(tv);
/* 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) {
return res;
}
if (win32op->readset_out->fd_count) {
i = evutil_weakrand_range_(&base->weakrand_seed,
win32op->readset_out->fd_count);
for (j=0; j<win32op->readset_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; j<win32op->exset_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) {
SOCKET s;
i = evutil_weakrand_range_(&base->weakrand_seed,
win32op->writeset_out->fd_count);
for (j=0; j<win32op->writeset_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
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