126 lines
4.5 KiB
C
126 lines
4.5 KiB
C
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/*
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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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