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/*
* Windows compat: POSIX compatibility wrapper
* Copyright © 2012-2013 RealVNC Ltd.
* Copyright © 2009-2010 Pete Batard <pete@akeo.ie>
* Copyright © 2016-2018 Chris Dickens <christopher.a.dickens@gmail.com>
* With contributions from Michael Plante, Orin Eman et al.
* Parts of poll implementation from libusb-win32, by Stephan Meyer et al.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#ifndef LIBUSB_POLL_WINDOWS_H
#define LIBUSB_POLL_WINDOWS_H
// Handle synchronous completion through the overlapped structure
#if !defined(STATUS_REPARSE) // reuse the REPARSE status code
#define STATUS_REPARSE ((LONG)0x00000104L)
#endif
#define STATUS_COMPLETED_SYNCHRONOUSLY STATUS_REPARSE
#define HasOverlappedIoCompletedSync(lpOverlapped) (((DWORD)(lpOverlapped)->Internal) == STATUS_COMPLETED_SYNCHRONOUSLY)
#define DUMMY_HANDLE ((HANDLE)(LONG_PTR)-2)
#define POLLIN 0x0001 /* There is data to read */
#define POLLPRI 0x0002 /* There is urgent data to read */
#define POLLOUT 0x0004 /* Writing now will not block */
#define POLLERR 0x0008 /* Error condition */
#define POLLHUP 0x0010 /* Hung up */
#define POLLNVAL 0x0020 /* Invalid request: fd not open */
typedef unsigned int usbi_nfds_t;
struct pollfd {
int fd; /* file descriptor */
short events; /* requested events */
short revents; /* returned events */
};
struct winfd {
int fd; // what's exposed to libusb core
OVERLAPPED *overlapped; // what will report our I/O status
};
extern const struct winfd INVALID_WINFD;
struct winfd usbi_create_fd(void);
int usbi_pipe(int pipefd[2]);
int usbi_poll(struct pollfd *fds, usbi_nfds_t nfds, int timeout);
ssize_t usbi_write(int fd, const void *buf, size_t count);
ssize_t usbi_read(int fd, void *buf, size_t count);
int usbi_close(int fd);
/*
* Timeval operations
*/
#if !defined(timersub)
#define timersub(a, b, result) \
do { \
(result)->tv_sec = (a)->tv_sec - (b)->tv_sec; \
(result)->tv_usec = (a)->tv_usec - (b)->tv_usec; \
if ((result)->tv_usec < 0L) { \
--(result)->tv_sec; \
(result)->tv_usec += 1000000L; \
} \
} while (0)
#endif
#endif
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