#include "event2/event-config.h"
#include "evconfig-private.h"
#ifdef EVENT__HAVE_SELECT
#ifdef __APPLE__
#define _DARWIN_UNLIMITED_SELECT
#endif
#include <sys/types.h>
#ifdef EVENT__HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#ifdef EVENT__HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif
#include <sys/queue.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include "event-internal.h"
#include "evsignal-internal.h"
#include "event2/thread.h"
#include "evthread-internal.h"
#include "log-internal.h"
#include "evmap-internal.h"
#ifndef EVENT__HAVE_FD_MASK
typedef unsigned long fd_mask;
#endif
#ifndef NFDBITS
#define NFDBITS (sizeof(fd_mask)*8)
#endif
#define DIV_ROUNDUP(x, y) (((x)+((y)-1))/(y))
#define SELECT_ALLOC_SIZE(n) \
(DIV_ROUNDUP(n, NFDBITS) * sizeof(fd_mask))
struct selectop {
int event_fds;
int event_fdsz;
int resize_out_sets;
fd_set *event_readset_in;
fd_set *event_writeset_in;
fd_set *event_readset_out;
fd_set *event_writeset_out;
};
static void *select_init(struct event_base *);
static int select_add(struct event_base *, int, short old, short events, void*);
static int select_del(struct event_base *, int, short old, short events, void*);
static int select_dispatch(struct event_base *, struct timeval *);
static void select_dealloc(struct event_base *);
const struct eventop selectops = {
"select",
select_init,
select_add,
select_del,
select_dispatch,
select_dealloc,
0,
EV_FEATURE_FDS,
0,
};
static int select_resize(struct selectop *sop, int fdsz);
static void select_free_selectop(struct selectop *sop);
static void *
select_init(struct event_base *base)
{
struct selectop *sop;
if (!(sop = mm_calloc(1, sizeof(struct selectop))))
return (NULL);
if (select_resize(sop, SELECT_ALLOC_SIZE(32 + 1))) {
select_free_selectop(sop);
return (NULL);
}
evsig_init_(base);
evutil_weakrand_seed_(&base->weakrand_seed, 0);
return (sop);
}
#ifdef CHECK_INVARIANTS
static void
check_selectop(struct selectop *sop)
{
}
#else
#define check_selectop(sop) do { (void) sop; } while (0)
#endif
static int
select_dispatch(struct event_base *base, struct timeval *tv)
{
int res=0, i, j, nfds;
struct selectop *sop = base->evbase;
check_selectop(sop);
if (sop->resize_out_sets) {
fd_set *readset_out=NULL, *writeset_out=NULL;
size_t sz = sop->event_fdsz;
if (!(readset_out = mm_realloc(sop->event_readset_out, sz)))
return (-1);
sop->event_readset_out = readset_out;
if (!(writeset_out = mm_realloc(sop->event_writeset_out, sz))) {
return (-1);
}
sop->event_writeset_out = writeset_out;
sop->resize_out_sets = 0;
}
memcpy(sop->event_readset_out, sop->event_readset_in,
sop->event_fdsz);
memcpy(sop->event_writeset_out, sop->event_writeset_in,
sop->event_fdsz);
nfds = sop->event_fds+1;
EVBASE_RELEASE_LOCK(base, th_base_lock);
res = select(nfds, sop->event_readset_out,
sop->event_writeset_out, NULL, tv);
EVBASE_ACQUIRE_LOCK(base, th_base_lock);
check_selectop(sop);
if (res == -1) {
if (errno != EINTR) {
event_warn("select");
return (-1);
}
return (0);
}
event_debug(("%s: select reports %d", __func__, res));
check_selectop(sop);
i = evutil_weakrand_range_(&base->weakrand_seed, nfds);
for (j = 0; j < nfds; ++j) {
if (++i >= nfds)
i = 0;
res = 0;
if (FD_ISSET(i, sop->event_readset_out))
res |= EV_READ;
if (FD_ISSET(i, sop->event_writeset_out))
res |= EV_WRITE;
if (res == 0)
continue;
evmap_io_active_(base, i, res);
}
check_selectop(sop);
return (0);
}
static int
select_resize(struct selectop *sop, int fdsz)
{
fd_set *readset_in = NULL;
fd_set *writeset_in = NULL;
if (sop->event_readset_in)
check_selectop(sop);
if ((readset_in = mm_realloc(sop->event_readset_in, fdsz)) == NULL)
goto error;
sop->event_readset_in = readset_in;
if ((writeset_in = mm_realloc(sop->event_writeset_in, fdsz)) == NULL) {
goto error;
}
sop->event_writeset_in = writeset_in;
sop->resize_out_sets = 1;
memset((char *)sop->event_readset_in + sop->event_fdsz, 0,
fdsz - sop->event_fdsz);
memset((char *)sop->event_writeset_in + sop->event_fdsz, 0,
fdsz - sop->event_fdsz);
sop->event_fdsz = fdsz;
check_selectop(sop);
return (0);
error:
event_warn("malloc");
return (-1);
}
static int
select_add(struct event_base *base, int fd, short old, short events, void *p)
{
struct selectop *sop = base->evbase;
(void) p;
EVUTIL_ASSERT((events & EV_SIGNAL) == 0);
check_selectop(sop);
if (sop->event_fds < fd) {
int fdsz = sop->event_fdsz;
if (fdsz < (int)sizeof(fd_mask))
fdsz = (int)sizeof(fd_mask);
while (fdsz < (int) SELECT_ALLOC_SIZE(fd + 1))
fdsz *= 2;
if (fdsz != sop->event_fdsz) {
if (select_resize(sop, fdsz)) {
check_selectop(sop);
return (-1);
}
}
sop->event_fds = fd;
}
if (events & EV_READ)
FD_SET(fd, sop->event_readset_in);
if (events & EV_WRITE)
FD_SET(fd, sop->event_writeset_in);
check_selectop(sop);
return (0);
}
static int
select_del(struct event_base *base, int fd, short old, short events, void *p)
{
struct selectop *sop = base->evbase;
(void)p;
EVUTIL_ASSERT((events & EV_SIGNAL) == 0);
check_selectop(sop);
if (sop->event_fds < fd) {
check_selectop(sop);
return (0);
}
if (events & EV_READ)
FD_CLR(fd, sop->event_readset_in);
if (events & EV_WRITE)
FD_CLR(fd, sop->event_writeset_in);
check_selectop(sop);
return (0);
}
static void
select_free_selectop(struct selectop *sop)
{
if (sop->event_readset_in)
mm_free(sop->event_readset_in);
if (sop->event_writeset_in)
mm_free(sop->event_writeset_in);
if (sop->event_readset_out)
mm_free(sop->event_readset_out);
if (sop->event_writeset_out)
mm_free(sop->event_writeset_out);
memset(sop, 0, sizeof(struct selectop));
mm_free(sop);
}
static void
select_dealloc(struct event_base *base)
{
evsig_dealloc_(base);
select_free_selectop(base->evbase);
}
#endif