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125 lines
4.5 KiB
125 lines
4.5 KiB
/* |
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* Windows compat: POSIX compatibility wrapper |
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* Copyright © 2012-2013 RealVNC Ltd. |
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* Copyright © 2009-2010 Pete Batard <pete@akeo.ie> |
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* With contributions from Michael Plante, Orin Eman et al. |
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* Parts of poll implementation from libusb-win32, by Stephan Meyer et al. |
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* |
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* This library is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* This library is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with this library; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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* |
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*/ |
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#pragma once |
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#if defined(_MSC_VER) |
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// disable /W4 MSVC warnings that are benign |
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#pragma warning(disable:4127) // conditional expression is constant |
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#endif |
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// Handle synchronous completion through the overlapped structure |
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#if !defined(STATUS_REPARSE) // reuse the REPARSE status code |
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#define STATUS_REPARSE ((LONG)0x00000104L) |
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#endif |
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#define STATUS_COMPLETED_SYNCHRONOUSLY STATUS_REPARSE |
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#if defined(_WIN32_WCE) |
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// WinCE doesn't have a HasOverlappedIoCompleted() macro, so attempt to emulate it |
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#define HasOverlappedIoCompleted(lpOverlapped) (((DWORD)(lpOverlapped)->Internal) != STATUS_PENDING) |
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#endif |
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#define HasOverlappedIoCompletedSync(lpOverlapped) (((DWORD)(lpOverlapped)->Internal) == STATUS_COMPLETED_SYNCHRONOUSLY) |
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#define DUMMY_HANDLE ((HANDLE)(LONG_PTR)-2) |
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enum windows_version { |
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WINDOWS_UNSUPPORTED, |
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WINDOWS_CE, |
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WINDOWS_XP, |
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WINDOWS_2003, // also includes XP 64 |
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WINDOWS_VISTA_AND_LATER, |
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}; |
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extern enum windows_version windows_version; |
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#define MAX_FDS 256 |
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#define POLLIN 0x0001 /* There is data to read */ |
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#define POLLPRI 0x0002 /* There is urgent data to read */ |
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#define POLLOUT 0x0004 /* Writing now will not block */ |
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#define POLLERR 0x0008 /* Error condition */ |
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#define POLLHUP 0x0010 /* Hung up */ |
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#define POLLNVAL 0x0020 /* Invalid request: fd not open */ |
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struct pollfd { |
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int fd; /* file descriptor */ |
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short events; /* requested events */ |
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short revents; /* returned events */ |
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}; |
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// access modes |
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enum rw_type { |
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RW_NONE, |
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RW_READ, |
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RW_WRITE, |
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}; |
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// fd struct that can be used for polling on Windows |
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typedef int cancel_transfer(struct usbi_transfer *itransfer); |
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struct winfd { |
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int fd; // what's exposed to libusb core |
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HANDLE handle; // what we need to attach overlapped to the I/O op, so we can poll it |
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OVERLAPPED* overlapped; // what will report our I/O status |
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struct usbi_transfer *itransfer; // Associated transfer, or NULL if completed |
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cancel_transfer *cancel_fn; // Function pointer to cancel transfer API |
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enum rw_type rw; // I/O transfer direction: read *XOR* write (NOT BOTH) |
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}; |
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extern const struct winfd INVALID_WINFD; |
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int usbi_pipe(int pipefd[2]); |
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int usbi_poll(struct pollfd *fds, unsigned int nfds, int timeout); |
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ssize_t usbi_write(int fd, const void *buf, size_t count); |
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ssize_t usbi_read(int fd, void *buf, size_t count); |
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int usbi_close(int fd); |
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void init_polling(void); |
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void exit_polling(void); |
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struct winfd usbi_create_fd(HANDLE handle, int access_mode, |
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struct usbi_transfer *transfer, cancel_transfer *cancel_fn); |
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void usbi_free_fd(struct winfd* winfd); |
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struct winfd fd_to_winfd(int fd); |
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struct winfd handle_to_winfd(HANDLE handle); |
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struct winfd overlapped_to_winfd(OVERLAPPED* overlapped); |
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/* |
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* Timeval operations |
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*/ |
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#if defined(DDKBUILD) |
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#include <winsock.h> // defines timeval functions on DDK |
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#endif |
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#if !defined(TIMESPEC_TO_TIMEVAL) |
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#define TIMESPEC_TO_TIMEVAL(tv, ts) { \ |
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(tv)->tv_sec = (long)(ts)->tv_sec; \ |
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(tv)->tv_usec = (long)(ts)->tv_nsec / 1000; \ |
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} |
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#endif |
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#if !defined(timersub) |
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#define timersub(a, b, result) \ |
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do { \ |
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(result)->tv_sec = (a)->tv_sec - (b)->tv_sec; \ |
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(result)->tv_usec = (a)->tv_usec - (b)->tv_usec; \ |
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if ((result)->tv_usec < 0) { \ |
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--(result)->tv_sec; \ |
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(result)->tv_usec += 1000000; \ |
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} \ |
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} while (0) |
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#endif
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