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/*
* Windows compat: POSIX compatibility wrapper
* Copyright (C) 2009-2010 Pete Batard <pbatard@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
*
*/
#pragma once
#if defined(_MSC_VER)
// disable /W4 MSVC warnings that are benign
#pragma warning(disable:4127) // conditional expression is constant
#endif
// Uncomment to have poll return with EINTR as soon as a new transfer (fd) is added
// This should result in a LIBUSB_ERROR_INTERRUPTED being returned by libusb calls,
// which should give the app an opportunity to resubmit a new fd set.
//#define DYNAMIC_FDS
// 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)
enum windows_version {
WINDOWS_UNSUPPORTED,
WINDOWS_XP,
WINDOWS_2003, // also includes XP 64
WINDOWS_VISTA_AND_LATER,
};
extern enum windows_version windows_version;
#define MAX_FDS 256
#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 */
struct pollfd {
int fd; /* file descriptor */
short events; /* requested events */
short revents; /* returned events */
};
typedef unsigned int nfds_t;
// access modes
enum rw_type {
RW_NONE,
RW_READ,
RW_WRITE,
};
// fd struct that can be used for polling on Windows
struct winfd {
int fd; // what's exposed to libusb core
HANDLE handle; // what we need to attach overlapped to the I/O op, so we can poll it
OVERLAPPED* overlapped; // what will report our I/O status
enum rw_type rw; // I/O transfer direction: read *XOR* write (NOT BOTH)
};
extern const struct winfd INVALID_WINFD;
int usbi_pipe(int pipefd[2]);
int usbi_poll(struct pollfd *fds, unsigned int 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);
void init_polling(void);
void exit_polling(void);
struct winfd usbi_create_fd(HANDLE handle, int access_mode);
void usbi_free_fd(int fd);
struct winfd fd_to_winfd(int fd);
struct winfd handle_to_winfd(HANDLE handle);
struct winfd overlapped_to_winfd(OVERLAPPED* overlapped);
/*
* Timeval operations
*/
#if defined(DDKBUILD)
#include <winsock.h> // defines timeval functions on DDK
#endif
#if !defined(TIMESPEC_TO_TIMEVAL)
#define TIMESPEC_TO_TIMEVAL(tv, ts) { \
(tv)->tv_sec = (long)(ts)->tv_sec; \
(tv)->tv_usec = (long)(ts)->tv_nsec / 1000; \
}
#endif
#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 < 0) { \
--(result)->tv_sec; \
(result)->tv_usec += 1000000; \
} \
} while (0)
#endif
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