1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
|
#include "HsMmap.h"
#include <windows.h>
#ifdef _DEBUG
int counters = 0;
int system_io_mmap_counters()
{
return counters;
}
#endif
//foreign import ccall unsafe "system_io_mmap_file_open" c_system_io_mmap_file_open :: CString -> CInt -> IO (Ptr ())
void *system_io_mmap_file_open(const char *filepath, int mode)
{
/*
HANDLE WINAPI CreateFileA(
__in LPCTSTR lpFileName,
__in DWORD dwDesiredAccess,
__in DWORD dwShareMode,
__in_opt LPSECURITY_ATTRIBUTES lpSecurityAttributes,
__in DWORD dwCreationDisposition,
__in DWORD dwFlagsAndAttributes,
__in_opt HANDLE hTemplateFile
);
*/
void *handle = NULL;
DWORD dwDesiredAccess;
DWORD dwCreationDisposition;
if( !filepath )
return NULL;
switch(mode) {
case 0:
dwDesiredAccess = GENERIC_READ;
dwCreationDisposition = OPEN_EXISTING;
break;
case 1:
dwDesiredAccess = GENERIC_WRITE|GENERIC_READ;
dwCreationDisposition = OPEN_EXISTING;
break;
case 2:
dwDesiredAccess = GENERIC_READ;
dwCreationDisposition = OPEN_EXISTING;
break;
case 3:
dwDesiredAccess = GENERIC_WRITE|GENERIC_READ;
dwCreationDisposition = OPEN_ALWAYS;
break;
default:
return NULL;
}
handle = CreateFileA(filepath,
dwDesiredAccess,
FILE_SHARE_READ|FILE_SHARE_WRITE|FILE_SHARE_DELETE,
NULL,
dwCreationDisposition,
FILE_ATTRIBUTE_NORMAL,
NULL);
if( handle==INVALID_HANDLE_VALUE )
return NULL;
#ifdef _DEBUG
counters++;
#endif
return handle;
}
//foreign import ccall unsafe "system_io_mmap_file_close" c_system_io_mmap_file_close :: FunPtr(Ptr () -> IO ())
void system_io_mmap_file_close(void *handle)
{
CloseHandle(handle);
#ifdef _DEBUG
counters--;
#endif
}
static char zerolength[1];
//foreign import ccall unsafe "system_io_mmap_mmap" c_system_io_mmap_mmap :: Ptr () -> CInt -> CLLong -> CInt -> IO (Ptr ())
void *system_io_mmap_mmap(void *handle, int mode, long long offset, size_t size)
{
/*
HANDLE WINAPI CreateFileMapping(
__in HANDLE hFile,
__in_opt LPSECURITY_ATTRIBUTES lpAttributes,
__in DWORD flProtect,
__in DWORD dwMaximumSizeHigh,
__in DWORD dwMaximumSizeLow,
__in_opt LPCTSTR lpName
);
LPVOID WINAPI MapViewOfFile(
__in HANDLE hFileMappingObject,
__in DWORD dwDesiredAccess,
__in DWORD dwFileOffsetHigh,
__in DWORD dwFileOffsetLow,
__in SIZE_T dwNumberOfBytesToMap
);
*/
HANDLE mapping;
void *ptr = NULL;
DWORD flProtect;
DWORD dwDesiredAccess;
switch(mode) {
case 0:
flProtect = PAGE_READONLY;
dwDesiredAccess = FILE_MAP_READ;
break;
case 1:
flProtect = PAGE_READWRITE;
dwDesiredAccess = FILE_MAP_WRITE;
break;
case 2:
flProtect = PAGE_WRITECOPY;
dwDesiredAccess = FILE_MAP_COPY;
break;
case 3:
flProtect = PAGE_READWRITE;
dwDesiredAccess = FILE_MAP_WRITE;
break;
default:
return NULL;
}
if( size>0 ) {
mapping = CreateFileMapping(handle, NULL, flProtect, (DWORD) ((offset + size)>>32), (DWORD)(offset + size), NULL);
if( !mapping ) {
// FIXME: check error code and translate this to errno
// DWORD dw = GetLastError();
}
ptr = MapViewOfFile(mapping,dwDesiredAccess, (DWORD)(offset>>32), (DWORD)(offset), size );
if( !ptr ) {
// FIXME: check error code and translate this to errno
// DWORD dw = GetLastError();
}
CloseHandle(mapping);
}
else {
ptr = zerolength;
}
#ifdef _DEBUG
if( ptr ) {
counters++;
}
#endif
return ptr;
}
/*
* MSDN states:
*
* Although an application may close the file handle used to create a file mapping object,
* the system holds the corresponding file open until the last view of the file is unmapped:
*
* Files for which the last view has not yet been unmapped are held open with no sharing restrictions.
*
* Who knows what this means?
*
* http://msdn.microsoft.com/en-us/library/aa366882(VS.85).aspx
*/
void system_io_mmap_munmap(void *sizeasptr, void *ptr) // Ptr () -> Ptr a -> IO ()
{
size_t size = (size_t)sizeasptr;
BOOL result;
if( size>0 ) {
result = UnmapViewOfFile(ptr);
#ifdef _DEBUG
if( result ) {
counters--;
}
#endif
}
else {
#ifdef _DEBUG
counters--;
#endif
}
}
//foreign import ccall unsafe "system_io_mmap_file_size" c_system_io_file_size :: Ptr () -> IO (CLLong)
long long system_io_mmap_file_size(void *handle)
{
DWORD lobits, hibits;
lobits = GetFileSize(handle,&hibits);
return (long long)lobits + ((long long)hibits << 32);
}
int system_io_mmap_extend_file_size(void *handle, long long size)
{
DWORD lobits = (DWORD)size, hibits = (DWORD)(size>>32);
HANDLE mapping = CreateFileMapping(handle,NULL,PAGE_READWRITE,hibits,lobits,NULL);
if(mapping==NULL)
return -1;
CloseHandle(mapping);
return 0;
}
//foreign import ccall unsafe "system_io_mmap_granularity" c_system_io_granularity :: CInt
int system_io_mmap_granularity()
{
SYSTEM_INFO sysinfo;
GetSystemInfo(&sysinfo);
return sysinfo.dwAllocationGranularity;
}
|
