/* Emulation for poll(2)
Contributed by Paolo Bonzini.
- Copyright 2001, 2002, 2003 Free Software Foundation, Inc.
+ Copyright 2001, 2002, 2003, 2006, 2007, 2008 Free Software Foundation, Inc.
This file is part of gnulib.
with this program; if not, write to the Free Software Foundation,
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
-#ifdef HAVE_CONFIG_H
-# include <config.h>
-#endif
+#include <config.h>
#include <sys/types.h>
#include "poll.h"
#include <errno.h>
#include <limits.h>
+
+#ifdef __MSVCRT__
+#include <windows.h>
+#include <winsock2.h>
+#include <io.h>
+#include <stdio.h>
+#include <conio.h>
+#else
#include <sys/socket.h>
#include <sys/select.h>
#include <unistd.h>
+#endif
-#if TIME_WITH_SYS_TIME
-# include <sys/time.h>
-# include <time.h>
-#else
-# if HAVE_SYS_TIME_H
-# include <sys/time.h>
-# else
-# include <time.h>
-# endif
+#ifdef HAVE_SYS_IOCTL_H
+#include <sys/ioctl.h>
+#endif
+#ifdef HAVE_SYS_FILIO_H
+#include <sys/filio.h>
#endif
+#include <sys/time.h>
+#include <time.h>
+
#ifndef INFTIM
#define INFTIM (-1)
#endif
-#ifndef EOVERFLOW
-#define EOVERFLOW EINVAL
+/* BeOS does not have MSG_PEEK. */
+#ifndef MSG_PEEK
+#define MSG_PEEK 0
#endif
+#ifdef __MSVCRT__
+
+/* 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 u {
+ NTSTATUS Status;
+ PVOID Pointer;
+ };
+ ULONG_PTR Information;
+} IO_STATUS_BLOCK, *PIO_STATUS_BLOCK;
+
+#define FilePipeLocalInformation 24
+
+typedef NTSTATUS (NTAPI *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. */
+
+static int
+win32_compute_revents (HANDLE h, int sought)
+{
+ int i, ret, happened;
+ INPUT_RECORD *irbuffer;
+ DWORD avail, nbuffer;
+ IO_STATUS_BLOCK iosb;
+ FILE_PIPE_LOCAL_INFORMATION fpli;
+ static PNtQueryInformationFile NtQueryInformationFile;
+
+ ret = WaitForSingleObject (h, 0);
+ if (ret != WAIT_OBJECT_0)
+ return sought & (POLLOUT | POLLWRNORM | POLLWRBAND);
+
+ switch (GetFileType (h))
+ {
+ case FILE_TYPE_PIPE:
+ if (!NtQueryInformationFile)
+ NtQueryInformationFile = (PNtQueryInformationFile)
+ GetProcAddress (GetModuleHandle ("ntdll.dll"),
+ "NtQueryInformationFile");
+
+ happened = 0;
+ if (!PeekNamedPipe (h, NULL, 0, NULL, &avail, NULL))
+ return POLLERR;
+
+ if (avail)
+ happened |= sought & (POLLIN | POLLRDNORM);
+
+ memset (&iosb, 0, sizeof (iosb));
+ memset (&fpli, 0, sizeof (fpli));
+
+ /* If NtQueryInformationFile fails, optimistically assume the pipe is
+ writable. This could happen on Win9x, because 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 WinXP SP2; WINE seems fine too). Otherwise,
+ ensure that enough space is available for atomic writes. */
+ if (NtQueryInformationFile (h, &iosb, &fpli, sizeof (fpli),
+ FilePipeLocalInformation)
+ || fpli.WriteQuotaAvailable >= PIPE_BUF
+ || (fpli.OutboundQuota < PIPE_BUF &&
+ fpli.WriteQuotaAvailable == fpli.OutboundQuota))
+ happened |= sought & (POLLOUT | POLLWRNORM | POLLWRBAND);
+
+ return happened;
+
+ case FILE_TYPE_CHAR:
+ nbuffer = avail = 0;
+ bRet = GetNumberOfConsoleInputEvents (h, &nbuffer);
+ if (!bRet || nbuffer == 0)
+ return POLLHUP;
+
+ 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 sought & ~(POLLPRI | POLLRDBAND);
+
+ return sought & (POLLOUT | POLLWRNORM | POLLWRBAND);
+
+ default:
+ return sought & ~(POLLPRI | POLLRDBAND);
+ }
+}
+
+/* Convert fd_sets returned by select into revents values. */
+
+static int
+win32_compute_revents_socket (SOCKET h, int sought,
+ fd_set *rfds, fd_set *wfds, fd_set *efds)
+{
+ int happened = 0;
+
+ if (FD_ISSET (h, rfds))
+ {
+ int r, error;
+
+ char data[64];
+ WSASetLastError (0);
+ r = recv (h, data, sizeof (data), MSG_PEEK);
+ error = WSAGetLastError ();
+ WSASetLastError (0);
+
+ if (r == 0)
+ happened |= POLLHUP;
+
+ /* If the event happened on an unconnected server socket,
+ that's fine. */
+ else if (r > 0 || ( /* (r == -1) && */ error == ENOTCONN))
+ happened |= (POLLIN | POLLRDNORM) & sought;
+
+ /* Distinguish hung-up sockets from other errors. */
+ else if (error == WSAESHUTDOWN || error == WSAECONNRESET
+ || error == WSAECONNABORTED || error == WSAENETRESET)
+ happened |= POLLHUP;
+
+ else
+ happened |= POLLERR;
+ }
+
+ if (FD_ISSET (h, wfds))
+ happened |= (POLLOUT | POLLWRNORM | POLLWRBAND) & sought;
+
+ if (FD_ISSET (h, efds))
+ happened |= (POLLPRI | POLLRDBAND) & sought;
+
+ return happened;
+}
+
+#else /* !MinGW */
+
+/* Convert select(2) returned fd_sets into poll(2) revents values. */
+static int
+compute_revents (int fd, int sought, fd_set *rfds, fd_set *wfds, fd_set *efds)
+{
+ int happened;
+ if (FD_ISSET (fd, rfds))
+ {
+ int r;
+ int socket_errno;
+
+#if defined __MACH__ && defined __APPLE__
+ /* There is a bug in Mac OS X that causes it to ignore MSG_PEEK
+ for some kinds of descriptors. Detect if this descriptor is a
+ connected socket, a server socket, or something else using a
+ 0-byte recv, and use ioctl(2) to detect POLLHUP. */
+ r = recv (fd, NULL, 0, MSG_PEEK);
+ socket_errno = (r < 0) ? errno : 0;
+ if (r == 0 || socket_errno == ENOTSOCK)
+ ioctl (fd, FIONREAD, &r);
+#else
+ char data[64];
+ r = recv (fd, data, sizeof (data), MSG_PEEK);
+ socket_errno = (r < 0) ? errno : 0;
+#endif
+ if (r == 0)
+ happened |= POLLHUP;
+
+ /* If the event happened on an unconnected server socket,
+ that's fine. */
+ else if (r > 0 || ( /* (r == -1) && */ socket_errno == ENOTCONN))
+ happened |= (POLLIN | POLLRDNORM) & sought;
+
+ /* Distinguish hung-up sockets from other errors. */
+ else if (socket_errno == ESHUTDOWN || socket_errno == ECONNRESET
+ || socket_errno == ECONNABORTED || socket_errno == ENETRESET)
+ happened |= POLLHUP;
+
+ else
+ happened |= POLLERR;
+ }
+
+ if (FD_ISSET (fd, wfds))
+ happened |= (POLLOUT | POLLWRNORM | POLLWRBAND) & sought;
+
+ if (FD_ISSET (fd, efds))
+ happened |= (POLLPRI | POLLRDBAND) & sought;
+
+ return happened;
+}
+#endif /* !MinGW */
+
int
poll (pfd, nfd, timeout)
struct pollfd *pfd;
nfds_t nfd;
int timeout;
{
+#ifndef __MSVCRT__
fd_set rfds, wfds, efds;
- struct timeval tv, *ptv;
- int maxfd, rc, happened;
+ struct timeval tv;
+ struct timeval *ptv;
+ int maxfd, rc;
nfds_t i;
- char data[64];
#ifdef _SC_OPEN_MAX
- if (nfd > sysconf (_SC_OPEN_MAX))
+ static int sc_open_max = -1;
+
+ if (nfd < 0
+ || (nfd > sc_open_max
+ && (sc_open_max != -1
+ || nfd > (sc_open_max = sysconf (_SC_OPEN_MAX)))))
{
errno = EINVAL;
return -1;
}
#else /* !_SC_OPEN_MAX */
#ifdef OPEN_MAX
- if (nfd > OPEN_MAX)
+ if (nfd < 0 || nfd > OPEN_MAX)
{
errno = EINVAL;
return -1;
}
/* convert timeout number into a timeval structure */
- ptv = &tv;
- if (timeout >= 0)
+ if (timeout == 0)
+ {
+ ptv = &tv;
+ ptv->tv_sec = 0;
+ ptv->tv_usec = 0;
+ }
+ else if (timeout > 0)
{
- /* return immediately or after timeout */
+ ptv = &tv;
ptv->tv_sec = timeout / 1000;
ptv->tv_usec = (timeout % 1000) * 1000;
}
| POLLWRNORM | POLLWRBAND)))
{
maxfd = pfd[i].fd;
+
+ /* Windows use a linear array of sockets (of size FD_SETSIZE). The
+ descriptor value is not used to address the array. */
+#if defined __CYGWIN__ || (!defined _WIN32 && !defined __WIN32__)
if (maxfd > FD_SETSIZE)
{
errno = EOVERFLOW;
return -1;
}
+#endif
}
}
/* examine fd sets */
rc = select (maxfd + 1, &rfds, &wfds, &efds, ptv);
+ if (rc < 0)
+ return rc;
/* establish results */
- if (rc > 0)
+ rc = 0;
+ for (i = 0; i < nfd; i++)
+ if (pfd[i].fd < 0)
+ pfd[i].revents = 0;
+ else
+ {
+ int happened = compute_revents (pfd[i].fd, pfd[i].events,
+ &rfds, &wfds, &efds);
+ if (happened)
+ {
+ pfd[i].revents = happened;
+ rc++;
+ }
+ }
+
+ return rc;
+#else
+ fd_set rfds, wfds, efds;
+ static struct timeval tv0;
+ struct timeval tv = { 0, 0 };
+ struct timeval *ptv;
+ static HANDLE hEvent;
+ HANDLE handle_array[FD_SET_SIZE + 2];
+ DWORD ret, wait_timeout, nhandles;
+ int nsock;
+ BOOL bRet;
+ MSG msg;
+ char sockbuf[256];
+ int rc;
+ nfds_t i;
+
+ if (nfd < 0 || nfd > FD_SET_SIZE || timeout < 0)
{
- rc = 0;
- for (i = 0; i < nfd; i++)
- {
- pfd[i].revents = 0;
- if (pfd[i].fd < 0)
- continue;
+ errno = EINVAL;
+ return -1;
+ }
- happened = 0;
- if (FD_ISSET (pfd[i].fd, &rfds))
- {
- /* support for POLLHUP. An hung up descriptor does not
- increase the return value! */
- if (recv (pfd[i].fd, data, 64, MSG_PEEK) == -1)
- {
- if (errno == ESHUTDOWN || errno == ECONNRESET
- || errno == ECONNABORTED || errno == ENETRESET)
- pfd[i].revents |= POLLHUP;
- }
- else
- happened |= POLLIN | POLLRDNORM;
- }
+ if (!hEvent)
+ hEvent = CreateEvent (NULL, FALSE, FALSE, NULL);
+
+ handle_array[0] = hEvent;
+ nhandles = 1;
+ nsock = 0;
+
+ /* Classify socket handles and create fd sets. */
+ FD_ZERO (&rfds);
+ FD_ZERO (&wfds);
+ FD_ZERO (&efds);
+ for (i = 0; i < nfd; i++)
+ {
+ if (pfd[i].fd < 0)
+ continue;
+
+ h = (HANDLE) _get_osfhandle (i);
+ assert (h != NULL);
+ optlen = sizeof(sockbuf);
+ if ((getsockopt ((SOCKET) h, SOL_SOCKET, SO_TYPE, sockbuf, &optlen)
+ != SOCKET_ERROR)
+ || WSAGetLastError() != WSAENOTSOCK)
+ {
+ int ev = 0;
+
+ /* see above; socket handles are mapped onto select. */
+ if (pfd[i].events & (POLLIN | POLLRDNORM))
+ {
+ FD_SET (pfd[i].fd, &rfds);
+ ev |= FD_READ | FD_ACCEPT;
+ }
+ if (pfd[i].events & (POLLOUT | POLLWRNORM | POLLWRBAND))
+ {
+ FD_SET (pfd[i].fd, &wfds);
+ ev |= FD_WRITE | FD_CONNECT;
+ }
+ if (pfd[i].events & (POLLPRI | POLLRDBAND))
+ {
+ FD_SET (pfd[i].fd, &efds);
+ ev |= FD_OOB;
+ }
+ if (ev)
+ {
+ WSAEventSelect ((SOCKET) h, hEvent, ev);
+ nsock++;
+ }
+ }
+ else
+ {
+ if (pfd[i].events & (POLLIN | POLLRDNORM |
+ POLLOUT | POLLWRNORM | POLLWRBAND))
+ handle_array[nhandles++] = h;
+ }
+ }
- if (FD_ISSET (pfd[i].fd, &wfds))
- happened |= POLLOUT | POLLWRNORM | POLLWRBAND;
+ if (timeout == INFTIM)
+ wait_timeout = INFINITE;
+ else
+ wait_timeout = timeout;
- if (FD_ISSET (pfd[i].fd, &efds))
- happened |= POLLPRI | POLLRDBAND;
+ for (;;)
+ {
+ ret = MsgWaitForMultipleObjects (nhandles, handle_array, FALSE,
+ wait_timeout, QS_ALLINPUT);
- pfd[i].revents |= pfd[i].events & happened;
- rc += (happened > 0);
+ if (ret == WAIT_OBJECT_0 + nhandles)
+ {
+ /* new input of some other kind */
+ while ((bRet = PeekMessage (&msg, NULL, 0, 0, PM_REMOVE)) != 0)
+ {
+ TranslateMessage (&msg);
+ DispatchMessage (&msg);
+ }
}
+ else
+ break;
+ }
+
+ /* Now check if the sockets have some event set. */
+ select (nsock + 1, rfds, wfds, efds, &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)
+ {
+ pfd[i].revents = 0;
+ continue;
+ }
+
+ h = (HANDLE) _get_osfhandle (i);
+ if (h != handle_array[nhandles])
+ {
+ /* It's a socket. */
+ WSAEventSelect (h, 0, 0);
+ happened = win32_compute_revents_socket ((SOCKET) h, pfd[i].events,
+ &rfds, &wfds, &efds);
+ }
+ else
+ {
+ /* Not a socket. */
+ nhandles++;
+ happened = win32_compute_revents (h, pfd[i].events);
+ }
+
+ if (happened)
+ {
+ pfd[i].revents = happened;
+ rc++;
+ }
}
return rc;
+#endif
}
projects / gnulib.git / blobdiff