ReactOS  0.4.14-dev-49-gfb4591c
pnp_list_manager.c
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1 /*
2  * PROJECT: ReactOS
3  * LICENSE: GPL - See COPYING in the top level directory
4  * FILE: base/services/audiosrv/pnp_list_manager.c
5  * PURPOSE: Audio Service List Manager
6  * COPYRIGHT: Copyright 2007 Andrew Greenwood
7  */
8 
9 #include "audiosrv.h"
10 
11 /*
12  Device descriptor
13 */
14 
15 VOID*
17 {
19 
21  int size = sizeof(PnP_AudioDevice) + path_length;
22 
23 /* printf("path_length %d, total %d\n", path_length, size);*/
24 
25  device = malloc(size);
26  if (! device)
27  {
28  logmsg("Failed to create a device descriptor (malloc fail)\n");
29  return NULL;
30  }
31 
32  device->enabled = is_enabled;
33  memcpy(device->path, path, path_length);
34 
35  return device;
36 }
37 
38 
39 /*
40  Device list (manager-side)
41 
42  The device list is stored in some shared-memory, with a named, global
43  mutex to provide a locking mechanism (to avoid it from being updated
44  whilst being read).
45 */
46 
49 
50 
51 /*
52  TODO: Detect duplicate entries and ignore them! (In case we receive
53  a PnP event for an existing device...)
54 */
55 
56 BOOL
58 {
59  int device_info_size;
60 
61  /* Figure out the actual structure size */
62  device_info_size = sizeof(PnP_AudioDevice);
63  device_info_size += WideStringSize(device->path);
64 
66 
67 /*
68  printf("list size is %d\n", audio_device_list->size);
69  printf("device info size is %d bytes\n", device_info_size);
70 */
71 
72  /* We DON'T want to overshoot the end of the buffer! */
73  if (audio_device_list->size + device_info_size > audio_device_list->max_size)
74  {
75  /*printf("max_size would be exceeded! Failing...\n");*/
76 
78 
79  return FALSE;
80  }
81 
82  /* Commit the device descriptor to the list */
84  device,
85  device_info_size);
86 
87  /* Update the header */
89  audio_device_list->size += device_info_size;
90 
92 
93  logmsg("Device added to list\n");
94 
95  return TRUE;
96 }
97 
98 BOOL
100 {
101 /* printf("Initializing memory device list lock\n");*/
102 
104  {
105  /*printf("Failed!\n");*/
106  return FALSE;
107  }
108 
109  /* Preliminary locking - the list memory will likely be a big
110  buffer of gibberish at this point so we don't want anyone
111  turning up before we're ready... */
113 
114  logmsg("Creating file mapping\n");
115  /* Expose our device list to the world */
117  NULL,
119  0,
120  max_size,
122  if (!device_list_file)
123  {
124  logmsg("Creation of audio device list failed (err %d)\n", GetLastError());
125 
128 
129  return FALSE;
130  }
131 
132  logmsg("Mapping view of file\n");
133  /* Of course, we'll need to access the list ourselves */
136  0,
137  0,
138  max_size);
139  if (!audio_device_list)
140  {
141  logmsg("MapViewOfFile FAILED (err %d)\n", GetLastError());
142 
145 
148 
149  return FALSE;
150  }
151 
152  /* Clear the mem to avoid any random stray data */
154 
155  /* Don't want devices to overwrite the list! */
159 
161 
162  logmsg("Device list created\n");
163 
164  return TRUE;
165 }
166 
167 VOID
169 {
170  logmsg("Destroying device list\n");
171 
173 
174  /*printf("Unmapping view\n");*/
177 
178  /*printf("Closing memory mapped file\n");*/
181 
183 
184  /*printf("Killing devlist lock\n");*/
186 }
VOID * CreateDeviceDescriptor(WCHAR *path, BOOL is_enabled)
VOID UnlockAudioDeviceList(VOID)
Definition: pnp_list_lock.c:53
#define TRUE
Definition: types.h:120
#define CloseHandle
Definition: compat.h:398
#define MapViewOfFile
Definition: compat.h:402
#define AUDIO_LIST_NAME
Definition: audiosrv.h:22
BOOL InitializeAudioDeviceListLock(VOID)
Definition: pnp_list_lock.c:16
#define INVALID_HANDLE_VALUE
Definition: compat.h:391
DWORD WINAPI GetLastError(VOID)
Definition: except.c:1059
static HANDLE device_list_file
unsigned int BOOL
Definition: ntddk_ex.h:94
Definition: devices.h:37
VOID DestroyAudioDeviceList(VOID)
static INT max_size
Definition: history.c:51
smooth NULL
Definition: ftsmooth.c:416
BOOL CreateAudioDeviceList(DWORD max_size)
BOOL AppendAudioDeviceToList(PnP_AudioDevice *device)
GLsizeiptr size
Definition: glext.h:5919
__wchar_t WCHAR
Definition: xmlstorage.h:180
#define CreateFileMappingW(a, b, c, d, e, f)
Definition: compat.h:401
#define FILE_MAP_WRITE
Definition: winbase.h:154
static long path_length
Definition: maze.c:116
unsigned long DWORD
Definition: ntddk_ex.h:95
DWORD device_count
Definition: audiosrv.h:37
void logmsg(char *string,...)
Definition: debug.c:7
#define memcpy(s1, s2, n)
Definition: mkisofs.h:878
VOID KillAudioDeviceListLock(VOID)
Definition: pnp_list_lock.c:39
DWORD max_size
Definition: audiosrv.h:36
Definition: services.c:325
static PnP_AudioHeader * audio_device_list
#define malloc
Definition: debug_ros.c:4
#define WideStringSize(str)
Definition: audiosrv.h:45
#define UnmapViewOfFile
Definition: compat.h:403
#define memset(x, y, z)
Definition: compat.h:39
VOID LockAudioDeviceList(VOID)
Definition: pnp_list_lock.c:46
#define PAGE_READWRITE
Definition: nt_native.h:1304