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authorJoachim Schmitz <jojo@schmitz-digital.de>2012-09-17 21:16:39 (GMT)
committerJunio C Hamano <gitster@pobox.com>2012-09-17 22:42:57 (GMT)
commit6d45eb1720294a93e571e843efb851fee70ac5e1 (patch)
tree0687cfb36e37e79e4b49594df8f789c6df92778c /compat/win32/poll.c
parent83379df0251243b5e1f328598bfdd39327766df3 (diff)
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make poll available for other platforms lacking it
move poll.[ch] out of compat/win32/ into compat/poll/ and adjust Makefile with the changed paths. Adding comments to Makefile about how/when to enable it and add logic for this Signed-off-by: Joachim Schmitz <jojo@schmitz-digital.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 'compat/win32/poll.c')
-rw-r--r--compat/win32/poll.c606
1 files changed, 0 insertions, 606 deletions
diff --git a/compat/win32/poll.c b/compat/win32/poll.c
deleted file mode 100644
index 403eaa7..0000000
--- a/compat/win32/poll.c
+++ /dev/null
@@ -1,606 +0,0 @@
-/* Emulation for poll(2)
- Contributed by Paolo Bonzini.
-
- Copyright 2001-2003, 2006-2011 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, write to the Free Software Foundation,
- Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
-
-/* 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 <malloc.h>
-
-#include <sys/types.h>
-
-/* Specification. */
-#include <poll.h>
-
-#include <errno.h>
-#include <limits.h>
-#include <assert.h>
-
-#if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
-# define WIN32_NATIVE
-# if defined (_MSC_VER)
-# define _WIN32_WINNT 0x0502
-# endif
-# include <winsock2.h>
-# include <windows.h>
-# include <io.h>
-# include <stdio.h>
-# include <conio.h>
-#else
-# include <sys/time.h>
-# include <sys/socket.h>
-# include <sys/select.h>
-# include <unistd.h>
-#endif
-
-#ifdef HAVE_SYS_IOCTL_H
-# include <sys/ioctl.h>
-#endif
-#ifdef HAVE_SYS_FILIO_H
-# include <sys/filio.h>
-#endif
-
-#include <time.h>
-
-#ifndef INFTIM
-# define INFTIM (-1)
-#endif
-
-/* BeOS does not have MSG_PEEK. */
-#ifndef MSG_PEEK
-# define MSG_PEEK 0
-#endif
-
-#ifdef WIN32_NATIVE
-
-#define IsConsoleHandle(h) (((long) (h) & 3) == 3)
-
-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
-win32_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 Win9x, 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 WinXP 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
-win32_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;
-}
-
-#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 = 0;
- 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 (struct pollfd *pfd, nfds_t nfd, int timeout)
-{
-#ifndef WIN32_NATIVE
- fd_set rfds, wfds, efds;
- struct timeval tv;
- struct timeval *ptv;
- int maxfd, rc;
- nfds_t i;
-
-# ifdef _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 < 0 || nfd > OPEN_MAX)
- {
- errno = EINVAL;
- return -1;
- }
-# endif /* OPEN_MAX -- else, no check is needed */
-# endif /* !_SC_OPEN_MAX */
-
- /* EFAULT is not necessary to implement, but let's do it in the
- simplest case. */
- if (!pfd)
- {
- errno = EFAULT;
- return -1;
- }
-
- /* convert timeout number into a timeval structure */
- if (timeout == 0)
- {
- ptv = &tv;
- ptv->tv_sec = 0;
- ptv->tv_usec = 0;
- }
- else if (timeout > 0)
- {
- ptv = &tv;
- ptv->tv_sec = timeout / 1000;
- ptv->tv_usec = (timeout % 1000) * 1000;
- }
- else if (timeout == INFTIM)
- /* wait forever */
- ptv = NULL;
- else
- {
- errno = EINVAL;
- return -1;
- }
-
- /* create fd sets and determine max fd */
- maxfd = -1;
- FD_ZERO (&rfds);
- FD_ZERO (&wfds);
- FD_ZERO (&efds);
- for (i = 0; i < nfd; i++)
- {
- if (pfd[i].fd < 0)
- continue;
-
- if (pfd[i].events & (POLLIN | POLLRDNORM))
- FD_SET (pfd[i].fd, &rfds);
-
- /* see select(2): "the only exceptional condition detectable
- is out-of-band data received on a socket", hence we push
- POLLWRBAND events onto wfds instead of efds. */
- if (pfd[i].events & (POLLOUT | POLLWRNORM | POLLWRBAND))
- FD_SET (pfd[i].fd, &wfds);
- if (pfd[i].events & (POLLPRI | POLLRDBAND))
- FD_SET (pfd[i].fd, &efds);
- if (pfd[i].fd >= maxfd
- && (pfd[i].events & (POLLIN | POLLOUT | POLLPRI
- | POLLRDNORM | POLLRDBAND
- | POLLWRNORM | POLLWRBAND)))
- {
- maxfd = pfd[i].fd;
- if (maxfd > FD_SETSIZE)
- {
- errno = EOVERFLOW;
- return -1;
- }
- }
- }
-
- /* examine fd sets */
- rc = select (maxfd + 1, &rfds, &wfds, &efds, ptv);
- if (rc < 0)
- return rc;
-
- /* establish results */
- 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
- 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);
- assert (h != NULL);
- 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. win32_compute_revents eliminates
- bits for the "wrong" direction. */
- pfd[i].revents = win32_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 = win32_compute_revents_socket ((SOCKET) h, pfd[i].events,
- ev.lNetworkEvents);
- }
- else
- {
- /* Not a socket. */
- int sought = pfd[i].events;
- happened = win32_compute_revents (h, &sought);
- nhandles++;
- }
-
- if ((pfd[i].revents |= happened) != 0)
- rc++;
- }
-
- if (!rc && timeout == INFTIM)
- {
- SwitchToThread();
- goto restart;
- }
-
- return rc;
-#endif
-}