1 /* 2 * Windows compat: POSIX compatibility wrapper 3 * Copyright (C) 2009-2010 Pete Batard <pbatard (at) gmail.com> 4 * With contributions from Michael Plante, Orin Eman et al. 5 * Parts of poll implementation from libusb-win32, by Stephan Meyer et al. 6 * 7 * This library is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Lesser General Public 9 * License as published by the Free Software Foundation; either 10 * version 2.1 of the License, or (at your option) any later version. 11 * 12 * This library is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * Lesser General Public License for more details. 16 * 17 * You should have received a copy of the GNU Lesser General Public 18 * License along with this library; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 20 * 21 */ 22 #pragma once 23 24 #if defined(_MSC_VER) 25 // disable /W4 MSVC warnings that are benign 26 #pragma warning(disable:4127) // conditional expression is constant 27 #endif 28 29 // Handle synchronous completion through the overlapped structure 30 #if !defined(STATUS_REPARSE) // reuse the REPARSE status code 31 #define STATUS_REPARSE ((LONG)0x00000104L) 32 #endif 33 #define STATUS_COMPLETED_SYNCHRONOUSLY STATUS_REPARSE 34 #define HasOverlappedIoCompletedSync(lpOverlapped) (((DWORD)(lpOverlapped)->Internal) == STATUS_COMPLETED_SYNCHRONOUSLY) 35 36 #define DUMMY_HANDLE ((HANDLE)(LONG_PTR)-2) 37 38 enum windows_version { 39 WINDOWS_UNSUPPORTED, 40 WINDOWS_XP, 41 WINDOWS_2003, // also includes XP 64 42 WINDOWS_VISTA_AND_LATER, 43 }; 44 extern enum windows_version windows_version; 45 46 #define MAX_FDS 256 47 48 #define POLLIN 0x0001 /* There is data to read */ 49 #define POLLPRI 0x0002 /* There is urgent data to read */ 50 #define POLLOUT 0x0004 /* Writing now will not block */ 51 #define POLLERR 0x0008 /* Error condition */ 52 #define POLLHUP 0x0010 /* Hung up */ 53 #define POLLNVAL 0x0020 /* Invalid request: fd not open */ 54 55 struct pollfd { 56 int fd; /* file descriptor */ 57 short events; /* requested events */ 58 short revents; /* returned events */ 59 }; 60 61 // access modes 62 enum rw_type { 63 RW_NONE, 64 RW_READ, 65 RW_WRITE, 66 }; 67 68 // fd struct that can be used for polling on Windows 69 struct winfd { 70 int fd; // what's exposed to libusb core 71 HANDLE handle; // what we need to attach overlapped to the I/O op, so we can poll it 72 OVERLAPPED* overlapped; // what will report our I/O status 73 enum rw_type rw; // I/O transfer direction: read *XOR* write (NOT BOTH) 74 }; 75 extern const struct winfd INVALID_WINFD; 76 77 int usbi_pipe(int pipefd[2]); 78 int usbi_poll(struct pollfd *fds, unsigned int nfds, int timeout); 79 ssize_t usbi_write(int fd, const void *buf, size_t count); 80 ssize_t usbi_read(int fd, void *buf, size_t count); 81 int usbi_close(int fd); 82 83 void init_polling(void); 84 void exit_polling(void); 85 struct winfd usbi_create_fd(HANDLE handle, int access_mode); 86 void usbi_free_fd(int fd); 87 struct winfd fd_to_winfd(int fd); 88 struct winfd handle_to_winfd(HANDLE handle); 89 struct winfd overlapped_to_winfd(OVERLAPPED* overlapped); 90 91 /* 92 * Timeval operations 93 */ 94 #if defined(DDKBUILD) 95 #include <winsock.h> // defines timeval functions on DDK 96 #endif 97 98 #if !defined(timersub) 99 #define timersub(a, b, result) \ 100 do { \ 101 (result)->tv_sec = (a)->tv_sec - (b)->tv_sec; \ 102 (result)->tv_usec = (a)->tv_usec - (b)->tv_usec; \ 103 if ((result)->tv_usec < 0) { \ 104 --(result)->tv_sec; \ 105 (result)->tv_usec += 1000000; \ 106 } \ 107 } while (0) 108 #endif 109 110
