Fix issue 1) not recognizes some usb device, 2) reconnect when ffmpeg encoder error
[rtmpclient.git] / app / src / main / jni / libusb / libusb / os / poll_windows.h
1 /*
2  * Windows compat: POSIX compatibility wrapper
3  * Copyright © 2012-2013 RealVNC Ltd.
4  * Copyright © 2009-2010 Pete Batard <pete@akeo.ie>
5  * With contributions from Michael Plante, Orin Eman et al.
6  * Parts of poll implementation from libusb-win32, by Stephan Meyer et al.
7  *
8  * This library is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * This library is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with this library; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  *
22  */
23 #pragma once
24
25 #if defined(_MSC_VER)
26 // disable /W4 MSVC warnings that are benign
27 #pragma warning(disable:4127) // conditional expression is constant
28 #endif
29
30 // Handle synchronous completion through the overlapped structure
31 #if !defined(STATUS_REPARSE)    // reuse the REPARSE status code
32 #define STATUS_REPARSE ((LONG)0x00000104L)
33 #endif
34 #define STATUS_COMPLETED_SYNCHRONOUSLY  STATUS_REPARSE
35 #if defined(_WIN32_WCE)
36 // WinCE doesn't have a HasOverlappedIoCompleted() macro, so attempt to emulate it
37 #define HasOverlappedIoCompleted(lpOverlapped) (((DWORD)(lpOverlapped)->Internal) != STATUS_PENDING)
38 #endif
39 #define HasOverlappedIoCompletedSync(lpOverlapped)      (((DWORD)(lpOverlapped)->Internal) == STATUS_COMPLETED_SYNCHRONOUSLY)
40
41 #define DUMMY_HANDLE ((HANDLE)(LONG_PTR)-2)
42
43 enum windows_version {
44         WINDOWS_UNSUPPORTED,
45         WINDOWS_CE,
46         WINDOWS_XP,
47         WINDOWS_2003,   // also includes XP 64
48         WINDOWS_VISTA_AND_LATER,
49 };
50 extern enum windows_version windows_version;
51
52 #define MAX_FDS     256
53
54 #define POLLIN      0x0001    /* There is data to read */
55 #define POLLPRI     0x0002    /* There is urgent data to read */
56 #define POLLOUT     0x0004    /* Writing now will not block */
57 #define POLLERR     0x0008    /* Error condition */
58 #define POLLHUP     0x0010    /* Hung up */
59 #define POLLNVAL    0x0020    /* Invalid request: fd not open */
60
61 struct pollfd {
62     int fd;           /* file descriptor */
63     short events;     /* requested events */
64     short revents;    /* returned events */
65 };
66
67 // access modes
68 enum rw_type {
69         RW_NONE,
70         RW_READ,
71         RW_WRITE,
72 };
73
74 // fd struct that can be used for polling on Windows
75 typedef int cancel_transfer(struct usbi_transfer *itransfer);
76
77 struct winfd {
78         int fd;                                                 // what's exposed to libusb core
79         HANDLE handle;                                  // what we need to attach overlapped to the I/O op, so we can poll it
80         OVERLAPPED* overlapped;                 // what will report our I/O status
81         struct usbi_transfer *itransfer;                // Associated transfer, or NULL if completed
82         cancel_transfer *cancel_fn;             // Function pointer to cancel transfer API
83         enum rw_type rw;                                // I/O transfer direction: read *XOR* write (NOT BOTH)
84 };
85 extern const struct winfd INVALID_WINFD;
86
87 int usbi_pipe(int pipefd[2]);
88 int usbi_poll(struct pollfd *fds, unsigned int nfds, int timeout);
89 ssize_t usbi_write(int fd, const void *buf, size_t count);
90 ssize_t usbi_read(int fd, void *buf, size_t count);
91 int usbi_close(int fd);
92
93 void init_polling(void);
94 void exit_polling(void);
95 struct winfd usbi_create_fd(HANDLE handle, int access_mode, 
96         struct usbi_transfer *transfer, cancel_transfer *cancel_fn);
97 void usbi_free_fd(struct winfd* winfd);
98 struct winfd fd_to_winfd(int fd);
99 struct winfd handle_to_winfd(HANDLE handle);
100 struct winfd overlapped_to_winfd(OVERLAPPED* overlapped);
101
102 /*
103  * Timeval operations
104  */
105 #if defined(DDKBUILD)
106 #include <winsock.h>    // defines timeval functions on DDK
107 #endif
108
109 #if !defined(TIMESPEC_TO_TIMEVAL)
110 #define TIMESPEC_TO_TIMEVAL(tv, ts) {                   \
111         (tv)->tv_sec = (long)(ts)->tv_sec;                  \
112         (tv)->tv_usec = (long)(ts)->tv_nsec / 1000;         \
113 }
114 #endif
115 #if !defined(timersub)
116 #define timersub(a, b, result)                          \
117 do {                                                    \
118         (result)->tv_sec = (a)->tv_sec - (b)->tv_sec;       \
119         (result)->tv_usec = (a)->tv_usec - (b)->tv_usec;    \
120         if ((result)->tv_usec < 0) {                        \
121                 --(result)->tv_sec;                             \
122                 (result)->tv_usec += 1000000;                   \
123         }                                                   \
124 } while (0)
125 #endif