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borrowed emulated poll for win32 from gnulib

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This commit is contained in:
hyunghwan.chung
2018-10-13 13:33:19 +00:00
parent 78b15bc610
commit dab1972d57
3 changed files with 472 additions and 17 deletions
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31
moo/lib/main.c
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@ -47,6 +47,14 @@
# include <ltdl.h>
# define USE_LTDL
# endif
# include "poll-msw.h"
# define USE_POLL
# define XPOLLIN POLLIN
# define XPOLLOUT POLLOUT
# define XPOLLERR POLLERR
# define XPOLLHUP POLLHUP
#elif defined(__OS2__)
# define INCL_DOSMODULEMGR
# define INCL_DOSPROCESS
@ -236,9 +244,9 @@ struct xtn_t
moo_oow_t len;
} logbuf;
#if defined(_WIN32)
#if defined(_WIN32)
HANDLE waitable_timer;
#else
#endif
#if defined(USE_DEVPOLL)
int ep; /* /dev/poll */
@ -301,7 +309,6 @@ struct xtn_t
pthread_cond_t cnd2;
#endif
} ev;
#endif
};
/* ========================================================================= */
@ -563,15 +570,6 @@ static void free_heap (moo_t* moo, void* ptr)
#endif
}
#if defined(_WIN32)
/* nothing to do */
#elif defined(macintosh)
/* nothing to do */
#else
static int write_all (int fd, const moo_bch_t* ptr, moo_oow_t len)
{
while (len > 0)
@ -605,7 +603,6 @@ static int write_all (int fd, const moo_bch_t* ptr, moo_oow_t len)
return 0;
}
#endif
static int write_log (moo_t* moo, int fd, const moo_bch_t* ptr, moo_oow_t len)
{
@ -1332,9 +1329,9 @@ static int vm_startup (moo_t* moo)
#elif defined(USE_EPOLL)
#if defined(EPOLL_CLOEXEC)
xtn->ep = epoll_create1 (EPOLL_CLOEXEC);
xtn->ep = epoll_create1(EPOLL_CLOEXEC);
#else
xtn->ep = epoll_create (1024);
xtn->ep = epoll_create(1024);
#endif
if (xtn->ep == -1)
{
@ -1346,7 +1343,7 @@ static int vm_startup (moo_t* moo)
#if defined(EPOLL_CLOEXEC)
/* do nothing */
#else
flag = fcntl (xtn->ep, F_GETFD);
flag = fcntl(xtn->ep, F_GETFD);
if (flag >= 0) fcntl (xtn->ep, F_SETFD, flag | FD_CLOEXEC);
#endif
@ -2121,7 +2118,7 @@ static void setup_tick (void)
g_tick_timer = CreateWaitableTimer(MOO_NULL, TRUE, MOO_NULL);
if (g_tick_timer)
{
li.QuadPart = -li.QuadPart = -MOO_SECNSEC_TO_NSEC(0, 20000); /* 20000 microseconds. 0.02 seconds */
li.QuadPart = -MOO_SECNSEC_TO_NSEC(0, 20000); /* 20000 microseconds. 0.02 seconds */
SetWaitableTimer (g_tick_timer, &li, 0, arrange_process_switching, MOO_NULL, FALSE);
}

412
moo/lib/poll-msw.c Normal file
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@ -0,0 +1,412 @@
/* Emulation for poll(2)
Contributed by Paolo Bonzini.
Copyright 2001-2003, 2006-2016 Free Software Foundation, Inc.
This file is part of gnulib.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, see <http://www.gnu.org/licenses/>. */
/* Tell gcc not to warn about the (nfd < 0) tests, below. */
#if (__GNUC__ == 4 && 3 <= __GNUC_MINOR__) || 4 < __GNUC__
# pragma GCC diagnostic ignored "-Wtype-limits"
#endif
#include "poll-msw.h"
#include <winsock2.h>
#include <windows.h>
#include <sys/types.h>
#include <time.h>
#include <errno.h>
#include <limits.h>
#ifndef INFTIM
# define INFTIM (-1)
#endif
/* BeOS does not have MSG_PEEK. */
#ifndef MSG_PEEK
# define MSG_PEEK 0
#endif
#ifndef POLLRDNORM
# define POLLRDNORM 0
# define POLLRDBAND 0
# define POLLWRNORM 0
# define POLLWRBAND 0
#endif
static BOOL IsConsoleHandle (HANDLE h)
{
DWORD mode;
return GetConsoleMode (h, &mode) != 0;
}
static BOOL IsSocketHandle (HANDLE h)
{
WSANETWORKEVENTS ev;
if (IsConsoleHandle (h)) return FALSE;
/* Under Wine, it seems that getsockopt returns 0 for pipes too.
WSAEnumNetworkEvents instead distinguishes the two correctly. */
ev.lNetworkEvents = 0xDEADBEEF;
WSAEnumNetworkEvents ((SOCKET) h, NULL, &ev);
return ev.lNetworkEvents != 0xDEADBEEF;
}
/* Declare data structures for ntdll functions. */
typedef struct _FILE_PIPE_LOCAL_INFORMATION
{
ULONG NamedPipeType;
ULONG NamedPipeConfiguration;
ULONG MaximumInstances;
ULONG CurrentInstances;
ULONG InboundQuota;
ULONG ReadDataAvailable;
ULONG OutboundQuota;
ULONG WriteQuotaAvailable;
ULONG NamedPipeState;
ULONG NamedPipeEnd;
} FILE_PIPE_LOCAL_INFORMATION, *PFILE_PIPE_LOCAL_INFORMATION;
typedef struct _IO_STATUS_BLOCK
{
union
{
DWORD Status;
PVOID Pointer;
} u;
ULONG_PTR Information;
} IO_STATUS_BLOCK, *PIO_STATUS_BLOCK;
typedef enum _FILE_INFORMATION_CLASS
{
FilePipeLocalInformation = 24
} FILE_INFORMATION_CLASS, *PFILE_INFORMATION_CLASS;
typedef DWORD (WINAPI *PNtQueryInformationFile) (HANDLE, IO_STATUS_BLOCK *, VOID *, ULONG, FILE_INFORMATION_CLASS);
# ifndef PIPE_BUF
# define PIPE_BUF 512
# endif
/* Compute revents values for file handle H. If some events cannot happen
for the handle, eliminate them from *P_SOUGHT. */
static int windows_compute_revents (HANDLE h, int *p_sought)
{
int i, ret, happened;
INPUT_RECORD *irbuffer;
DWORD avail, nbuffer;
BOOL bRet;
IO_STATUS_BLOCK iosb;
FILE_PIPE_LOCAL_INFORMATION fpli;
static PNtQueryInformationFile NtQueryInformationFile;
static BOOL once_only;
switch (GetFileType (h))
{
case FILE_TYPE_PIPE:
if (!once_only)
{
NtQueryInformationFile = (PNtQueryInformationFile)
GetProcAddress (GetModuleHandle ("ntdll.dll"),
"NtQueryInformationFile");
once_only = TRUE;
}
happened = 0;
if (PeekNamedPipe (h, NULL, 0, NULL, &avail, NULL) != 0)
{
if (avail)
happened |= *p_sought & (POLLIN | POLLRDNORM);
}
else if (GetLastError () == ERROR_BROKEN_PIPE)
happened |= POLLHUP;
else
{
/* It was the write-end of the pipe. Check if it is writable.
If NtQueryInformationFile fails, optimistically assume the pipe is
writable. This could happen on Windows 9x, where
NtQueryInformationFile is not available, or if we inherit a pipe
that doesn't permit FILE_READ_ATTRIBUTES access on the write end
(I think this should not happen since Windows XP SP2; WINE seems
fine too). Otherwise, ensure that enough space is available for
atomic writes. */
memset (&iosb, 0, sizeof (iosb));
memset (&fpli, 0, sizeof (fpli));
if (!NtQueryInformationFile
|| NtQueryInformationFile (h, &iosb, &fpli, sizeof (fpli),
FilePipeLocalInformation)
|| fpli.WriteQuotaAvailable >= PIPE_BUF
|| (fpli.OutboundQuota < PIPE_BUF &&
fpli.WriteQuotaAvailable == fpli.OutboundQuota))
happened |= *p_sought & (POLLOUT | POLLWRNORM | POLLWRBAND);
}
return happened;
case FILE_TYPE_CHAR:
ret = WaitForSingleObject (h, 0);
if (!IsConsoleHandle (h))
return ret == WAIT_OBJECT_0 ? *p_sought & ~(POLLPRI | POLLRDBAND) : 0;
nbuffer = avail = 0;
bRet = GetNumberOfConsoleInputEvents (h, &nbuffer);
if (bRet)
{
/* Input buffer. */
*p_sought &= POLLIN | POLLRDNORM;
if (nbuffer == 0)
return POLLHUP;
if (!*p_sought)
return 0;
irbuffer = (INPUT_RECORD *) alloca (nbuffer * sizeof (INPUT_RECORD));
bRet = PeekConsoleInput (h, irbuffer, nbuffer, &avail);
if (!bRet || avail == 0)
return POLLHUP;
for (i = 0; i < avail; i++)
if (irbuffer[i].EventType == KEY_EVENT)
return *p_sought;
return 0;
}
else
{
/* Screen buffer. */
*p_sought &= POLLOUT | POLLWRNORM | POLLWRBAND;
return *p_sought;
}
default:
ret = WaitForSingleObject (h, 0);
if (ret == WAIT_OBJECT_0)
return *p_sought & ~(POLLPRI | POLLRDBAND);
return *p_sought & (POLLOUT | POLLWRNORM | POLLWRBAND);
}
}
/* Convert fd_sets returned by select into revents values. */
static int windows_compute_revents_socket (SOCKET h, int sought, long lNetworkEvents)
{
int happened = 0;
if ((lNetworkEvents & (FD_READ | FD_ACCEPT | FD_CLOSE)) == FD_ACCEPT)
happened |= (POLLIN | POLLRDNORM) & sought;
else if (lNetworkEvents & (FD_READ | FD_ACCEPT | FD_CLOSE))
{
int r, error;
char data[64];
WSASetLastError (0);
r = recv (h, data, sizeof (data), MSG_PEEK);
error = WSAGetLastError ();
WSASetLastError (0);
if (r > 0 || error == WSAENOTCONN)
happened |= (POLLIN | POLLRDNORM) & sought;
/* Distinguish hung-up sockets from other errors. */
else if (r == 0 || error == WSAESHUTDOWN || error == WSAECONNRESET
|| error == WSAECONNABORTED || error == WSAENETRESET)
happened |= POLLHUP;
else
happened |= POLLERR;
}
if (lNetworkEvents & (FD_WRITE | FD_CONNECT))
happened |= (POLLOUT | POLLWRNORM | POLLWRBAND) & sought;
if (lNetworkEvents & FD_OOB)
happened |= (POLLPRI | POLLRDBAND) & sought;
return happened;
}
int poll (struct pollfd *pfd, nfds_t nfd, int timeout)
{
static struct timeval tv0;
static HANDLE hEvent;
WSANETWORKEVENTS ev;
HANDLE h, handle_array[FD_SETSIZE + 2];
DWORD ret, wait_timeout, nhandles;
fd_set rfds, wfds, xfds;
BOOL poll_again;
MSG msg;
int rc = 0;
nfds_t i;
if (nfd < 0 || timeout < -1)
{
errno = EINVAL;
return -1;
}
if (!hEvent)
hEvent = CreateEvent (NULL, FALSE, FALSE, NULL);
restart:
handle_array[0] = hEvent;
nhandles = 1;
FD_ZERO (&rfds);
FD_ZERO (&wfds);
FD_ZERO (&xfds);
/* Classify socket handles and create fd sets. */
for (i = 0; i < nfd; i++)
{
int sought = pfd[i].events;
pfd[i].revents = 0;
if (pfd[i].fd < 0)
continue;
if (!(sought & (POLLIN | POLLRDNORM | POLLOUT | POLLWRNORM | POLLWRBAND
| POLLPRI | POLLRDBAND)))
continue;
h = (HANDLE)_get_osfhandle (pfd[i].fd);
if (IsSocketHandle (h))
{
int requested = FD_CLOSE;
/* see above; socket handles are mapped onto select. */
if (sought & (POLLIN | POLLRDNORM))
{
requested |= FD_READ | FD_ACCEPT;
FD_SET ((SOCKET) h, &rfds);
}
if (sought & (POLLOUT | POLLWRNORM | POLLWRBAND))
{
requested |= FD_WRITE | FD_CONNECT;
FD_SET ((SOCKET) h, &wfds);
}
if (sought & (POLLPRI | POLLRDBAND))
{
requested |= FD_OOB;
FD_SET ((SOCKET) h, &xfds);
}
if (requested)
WSAEventSelect ((SOCKET) h, hEvent, requested);
}
else
{
/* Poll now. If we get an event, do not poll again. Also,
screen buffer handles are waitable, and they'll block until
a character is available. windows_compute_revents eliminates
bits for the "wrong" direction. */
pfd[i].revents = windows_compute_revents (h, &sought);
if (sought)
handle_array[nhandles++] = h;
if (pfd[i].revents)
timeout = 0;
}
}
if (select (0, &rfds, &wfds, &xfds, &tv0) > 0)
{
/* Do MsgWaitForMultipleObjects anyway to dispatch messages, but
no need to call select again. */
poll_again = FALSE;
wait_timeout = 0;
}
else
{
poll_again = TRUE;
if (timeout == INFTIM)
wait_timeout = INFINITE;
else
wait_timeout = timeout;
}
for (;;)
{
ret = MsgWaitForMultipleObjects (nhandles, handle_array, FALSE,
wait_timeout, QS_ALLINPUT);
if (ret == WAIT_OBJECT_0 + nhandles)
{
/* new input of some other kind */
BOOL bRet;
while ((bRet = PeekMessage (&msg, NULL, 0, 0, PM_REMOVE)) != 0)
{
TranslateMessage (&msg);
DispatchMessage (&msg);
}
}
else
break;
}
if (poll_again)
select (0, &rfds, &wfds, &xfds, &tv0);
/* Place a sentinel at the end of the array. */
handle_array[nhandles] = NULL;
nhandles = 1;
for (i = 0; i < nfd; i++)
{
int happened;
if (pfd[i].fd < 0)
continue;
if (!(pfd[i].events & (POLLIN | POLLRDNORM |
POLLOUT | POLLWRNORM | POLLWRBAND)))
continue;
h = (HANDLE) _get_osfhandle (pfd[i].fd);
if (h != handle_array[nhandles])
{
/* It's a socket. */
WSAEnumNetworkEvents ((SOCKET) h, NULL, &ev);
WSAEventSelect ((SOCKET) h, 0, 0);
/* If we're lucky, WSAEnumNetworkEvents already provided a way
to distinguish FD_READ and FD_ACCEPT; this saves a recv later. */
if (FD_ISSET ((SOCKET) h, &rfds) && !(ev.lNetworkEvents & (FD_READ | FD_ACCEPT)))
ev.lNetworkEvents |= FD_READ | FD_ACCEPT;
if (FD_ISSET ((SOCKET) h, &wfds))
ev.lNetworkEvents |= FD_WRITE | FD_CONNECT;
if (FD_ISSET ((SOCKET) h, &xfds))
ev.lNetworkEvents |= FD_OOB;
happened = windows_compute_revents_socket ((SOCKET) h, pfd[i].events, ev.lNetworkEvents);
}
else
{
/* Not a socket. */
int sought = pfd[i].events;
happened = windows_compute_revents (h, &sought);
nhandles++;
}
if ((pfd[i].revents |= happened) != 0) rc++;
}
if (!rc && timeout == INFTIM)
{
SleepEx (1, TRUE);
goto restart;
}
return rc;
}

46
moo/lib/poll-msw.h Normal file
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@ -0,0 +1,46 @@
#ifndef _POLL_MSW_H_
#define _POLL_MSW_H_
#include "moo.h"
/* Event types that can be polled for. These bits may be set in `events'
to indicate the interesting event types; they will appear in `revents'
to indicate the status of the file descriptor. */
#define POLLIN 0x001 /* There is data to read. */
#define POLLPRI 0x002 /* There is urgent data to read. */
#define POLLOUT 0x004 /* Writing now will not block. */
/* Event types always implicitly polled for. These bits need not be set in
`events', but they will appear in `revents' to indicate the status of
the file descriptor. */
#define POLLERR 0x008 /* Error condition. */
#define POLLHUP 0x010 /* Hung up. */
#define POLLNVAL 0x020 /* Invalid polling request. */
/* Data structure describing a polling request. */
struct pollfd
{
int fd; /* File descriptor to poll. */
short int events; /* Types of events poller cares about. */
short int revents; /* Types of events that actually occurred. */
};
/* Poll the file descriptors described by the NFDS structures starting at
FDS. If TIMEOUT is nonzero and not -1, allow TIMEOUT milliseconds for
an event to occur; if TIMEOUT is -1, block until an event occurs.
Returns the number of file descriptors with events, zero if timed out,
or -1 for errors. */
typedef unsigned long nfds_t;
#if defined(__cplusplus)
extern "C" {
#endif
int poll (struct pollfd *pfd, nfds_t nfd, int timeout);
#if defined(__cplusplus)
}
#endif
#endif