int event_pending (struct event *ev, short events, struct timeval *tv)
{
short revents = 0;
dLOOPev;
if (ev->ev_events & EV_SIGNAL)
{
/* sig */
if (ev_is_active (&ev->iosig.sig) || ev_is_pending (&ev->iosig.sig))
revents |= EV_SIGNAL;
}
else if (ev->ev_events & (EV_READ | EV_WRITE))
{
/* io */
if (ev_is_active (&ev->iosig.io) || ev_is_pending (&ev->iosig.io))
revents |= ev->ev_events & (EV_READ | EV_WRITE);
}
if (ev->ev_events & EV_TIMEOUT || ev_is_active (&ev->to) || ev_is_pending (&ev->to))
{
revents |= EV_TIMEOUT;
if (tv)
EV_TV_SET (tv, ev_now (EV_A)); /* not sure if this is right :) */
}
return events & revents;
}
static void
select_poll (EV_P_ ev_tstamp timeout)
{
struct timeval tv;
int res;
int fd_setsize;
EV_RELEASE_CB;
EV_TV_SET (tv, timeout);
#if EV_SELECT_USE_FD_SET
fd_setsize = sizeof (fd_set);
#else
fd_setsize = vec_max * NFDBYTES;
#endif
memcpy (vec_ro, vec_ri, fd_setsize);
memcpy (vec_wo, vec_wi, fd_setsize);
#ifdef _WIN32
/* pass in the write set as except set.
* the idea behind this is to work around a windows bug that causes
* errors to be reported as an exception and not by setting
* the writable bit. this is so uncontrollably lame.
*/
memcpy (vec_eo, vec_wi, fd_setsize);
res = select (vec_max * NFDBITS, (fd_set *)vec_ro, (fd_set *)vec_wo, (fd_set *)vec_eo, &tv);
#elif EV_SELECT_USE_FD_SET
fd_setsize = anfdmax < FD_SETSIZE ? anfdmax : FD_SETSIZE;
res = select (fd_setsize, (fd_set *)vec_ro, (fd_set *)vec_wo, 0, &tv);
#else
res = select (vec_max * NFDBITS, (fd_set *)vec_ro, (fd_set *)vec_wo, 0, &tv);
#endif
EV_ACQUIRE_CB;
if (expect_false (res < 0))
{
#if EV_SELECT_IS_WINSOCKET
errno = WSAGetLastError ();
#endif
#ifdef WSABASEERR
/* on windows, select returns incompatible error codes, fix this */
if (errno >= WSABASEERR && errno < WSABASEERR + 1000)
if (errno == WSAENOTSOCK)
errno = EBADF;
else
errno -= WSABASEERR;
#endif
#ifdef _WIN32
/* select on windows erroneously returns EINVAL when no fd sets have been
* provided (this is documented). what microsoft doesn't tell you that this bug
* exists even when the fd sets _are_ provided, so we have to check for this bug
* here and emulate by sleeping manually.
* we also get EINVAL when the timeout is invalid, but we ignore this case here
* and assume that EINVAL always means: you have to wait manually.
*/
if (errno == EINVAL)
{
if (timeout)
{
unsigned long ms = timeout * 1e3;
Sleep (ms ? ms : 1);
}
return;
}
#endif
if (errno == EBADF)
fd_ebadf (EV_A);
else if (errno == ENOMEM && !syserr_cb)
fd_enomem (EV_A);
else if (errno != EINTR)
ev_syserr ("(libev) select");
return;
}
#if EV_SELECT_USE_FD_SET
{
int fd;
for (fd = 0; fd < anfdmax; ++fd)
if (anfds [fd].events)
{
int events = 0;
#if EV_SELECT_IS_WINSOCKET
SOCKET handle = anfds [fd].handle;
#else
int handle = fd;
#endif
if (FD_ISSET (handle, (fd_set *)vec_ro)) events |= EV_READ;
if (FD_ISSET (handle, (fd_set *)vec_wo)) events |= EV_WRITE;
#ifdef _WIN32
if (FD_ISSET (handle, (fd_set *)vec_eo)) events |= EV_WRITE;
#endif
if (expect_true (events))
fd_event (EV_A_ fd, events);
}
}
#else
{
int word, bit;
for (word = vec_max; word--; )
{
fd_mask word_r = ((fd_mask *)vec_ro) [word];
fd_mask word_w = ((fd_mask *)vec_wo) [word];
#ifdef _WIN32
word_w |= ((fd_mask *)vec_eo) [word];
#endif
if (word_r || word_w)
for (bit = NFDBITS; bit--; )
{
fd_mask mask = 1UL << bit;
int events = 0;
events |= word_r & mask ? EV_READ : 0;
events |= word_w & mask ? EV_WRITE : 0;
if (expect_true (events))
fd_event (EV_A_ word * NFDBITS + bit, events);
}
}
}
#endif
}
static void
select_poll (EV_P_ ev_tstamp timeout)
{
struct timeval tv;
int res;
int fd_setsize;
#ifdef _WIN32
/* POSIX defines the case when the readfds, writefds, and errorfds arguments
* are all null pointers.
* http://pubs.opengroup.org/onlinepubs/9699919799/functions/select.html
*
* But Windows doesn't define such case; simply say don't so that
* https://msdn.microsoft.com/en-us/library/windows/desktop/ms740141(v=vs.85).aspx
* "Any two of the parameters, readfds, writefds, or exceptfds, can be given
* as null. At least one must be non-null, and any non-null descriptor set
* must contain at least one handle to a socket."
* At least on Windows Server 2012 R2 Datacenter with Visual Studio 2013
* (Visual C++ 12), it cause WaitForMultipleObjects stuck.
*/
if (EV_WIN_FD_COUNT(vec_ri) == 0 && EV_WIN_FD_COUNT(vec_wi) == 0)
return;
#endif
EV_RELEASE_CB;
EV_TV_SET (tv, timeout);
#if EV_SELECT_USE_FD_SET
fd_setsize = sizeof (fd_set);
#else
fd_setsize = vec_max * NFDBYTES;
#endif
memcpy (vec_ro, vec_ri, fd_setsize);
memcpy (vec_wo, vec_wi, fd_setsize);
#ifdef _WIN32
/* pass in the write set as except set.
* the idea behind this is to work around a windows bug that causes
* errors to be reported as an exception and not by setting
* the writable bit. this is so uncontrollably lame.
*/
memcpy (vec_eo, vec_wi, fd_setsize);
res = select (vec_max * NFDBITS, (fd_set *)vec_ro, (fd_set *)vec_wo, (fd_set *)vec_eo, &tv);
#elif EV_SELECT_USE_FD_SET
fd_setsize = anfdmax < FD_SETSIZE ? anfdmax : FD_SETSIZE;
res = select (fd_setsize, (fd_set *)vec_ro, (fd_set *)vec_wo, 0, &tv);
#else
res = select (vec_max * NFDBITS, (fd_set *)vec_ro, (fd_set *)vec_wo, 0, &tv);
#endif
EV_ACQUIRE_CB;
if (expect_false (res < 0))
{
#if EV_SELECT_IS_WINSOCKET
errno = WSAGetLastError ();
#endif
#ifdef WSABASEERR
/* on windows, select returns incompatible error codes, fix this */
if (errno >= WSABASEERR && errno < WSABASEERR + 1000)
if (errno == WSAENOTSOCK)
errno = EBADF;
else
errno -= WSABASEERR;
#endif
#ifdef _WIN32
/* select on windows erroneously returns EINVAL when no fd sets have been
* provided (this is documented). what microsoft doesn't tell you that this bug
* exists even when the fd sets _are_ provided, so we have to check for this bug
* here and emulate by sleeping manually.
* we also get EINVAL when the timeout is invalid, but we ignore this case here
* and assume that EINVAL always means: you have to wait manually.
*/
if (errno == EINVAL)
{
if (timeout)
{
unsigned long ms = (unsigned long)(timeout * 1e3);
Sleep (ms ? ms : 1);
}
return;
}
#endif
if (errno == EBADF)
fd_ebadf (EV_A);
else if (errno == ENOMEM && !syserr_cb)
fd_enomem (EV_A);
else if (errno != EINTR)
ev_syserr ("(libev) select");
return;
}
#if EV_SELECT_USE_FD_SET
{
int fd;
for (fd = 0; fd < anfdmax; ++fd)
if (anfds [fd].events)
{
int events = 0;
#if EV_SELECT_IS_WINSOCKET
SOCKET handle = anfds [fd].handle;
#else
int handle = fd;
#endif
if (EV_WIN_FD_ISSET (handle, (fd_set *)vec_ro)) events |= EV_READ;
if (EV_WIN_FD_ISSET (handle, (fd_set *)vec_wo)) events |= EV_WRITE;
#ifdef _WIN32
if (EV_WIN_FD_ISSET (handle, (fd_set *)vec_eo)) events |= EV_WRITE;
#endif
if (expect_true (events))
fd_event (EV_A_ fd, events);
}
}
#else
{
int word, bit;
for (word = vec_max; word--; )
{
fd_mask word_r = ((fd_mask *)vec_ro) [word];
fd_mask word_w = ((fd_mask *)vec_wo) [word];
#ifdef _WIN32
word_w |= ((fd_mask *)vec_eo) [word];
#endif
if (word_r || word_w)
for (bit = NFDBITS; bit--; )
{
fd_mask mask = 1UL << bit;
int events = 0;
events |= word_r & mask ? EV_READ : 0;
events |= word_w & mask ? EV_WRITE : 0;
if (expect_true (events))
fd_event (EV_A_ word * NFDBITS + bit, events);
}
}
}
#endif
}