2 * winmisc.c: miscellaneous Windows-specific things
10 OSVERSIONINFO osVersion
;
12 char *platform_get_x_display(void) {
13 /* We may as well check for DISPLAY in case it's useful. */
14 return dupstr(getenv("DISPLAY"));
17 Filename
filename_from_str(const char *str
)
20 strncpy(ret
.path
, str
, sizeof(ret
.path
));
21 ret
.path
[sizeof(ret
.path
)-1] = '\0';
25 const char *filename_to_str(const Filename
*fn
)
30 int filename_equal(Filename f1
, Filename f2
)
32 return !strcmp(f1
.path
, f2
.path
);
35 int filename_is_null(Filename fn
)
40 char *get_username(void)
44 int got_username
= FALSE
;
45 DECL_WINDOWS_FUNCTION(static, BOOLEAN
, GetUserNameExA
,
46 (EXTENDED_NAME_FORMAT
, LPSTR
, PULONG
));
49 static int tried_usernameex
= FALSE
;
50 if (!tried_usernameex
) {
51 /* Not available on Win9x, so load dynamically */
52 HMODULE secur32
= LoadLibrary("SECUR32.DLL");
53 GET_WINDOWS_FUNCTION(secur32
, GetUserNameExA
);
54 tried_usernameex
= TRUE
;
58 if (p_GetUserNameExA
) {
60 * If available, use the principal -- this avoids the problem
61 * that the local username is case-insensitive but Kerberos
62 * usernames are case-sensitive.
67 (void) p_GetUserNameExA(NameUserPrincipal
, NULL
, &namelen
);
69 user
= snewn(namelen
, char);
70 got_username
= p_GetUserNameExA(NameUserPrincipal
, user
, &namelen
);
72 char *p
= strchr(user
, '@');
80 /* Fall back to local user name */
82 if (GetUserName(NULL
, &namelen
) == FALSE
) {
84 * Apparently this doesn't work at least on Windows XP SP2.
85 * Thus assume a maximum of 256. It will fail again if it
91 user
= snewn(namelen
, char);
92 got_username
= GetUserName(user
, &namelen
);
98 return got_username ? user
: NULL
;
101 BOOL
init_winver(void)
103 ZeroMemory(&osVersion
, sizeof(osVersion
));
104 osVersion
.dwOSVersionInfoSize
= sizeof (OSVERSIONINFO
);
105 return GetVersionEx ( (OSVERSIONINFO
*) &osVersion
);
109 static FILE *debug_fp
= NULL
;
110 static HANDLE debug_hdl
= INVALID_HANDLE_VALUE
;
111 static int debug_got_console
= 0;
113 void dputs(char *buf
)
117 if (!debug_got_console
) {
118 if (AllocConsole()) {
119 debug_got_console
= 1;
120 debug_hdl
= GetStdHandle(STD_OUTPUT_HANDLE
);
124 debug_fp
= fopen("debug.log", "w");
127 if (debug_hdl
!= INVALID_HANDLE_VALUE
) {
128 WriteFile(debug_hdl
, buf
, strlen(buf
), &dw
, NULL
);
130 fputs(buf
, debug_fp
);
137 * Minefield - a Windows equivalent for Electric Fence
140 #define PAGESIZE 4096
145 * We start by reserving as much virtual address space as Windows
146 * will sensibly (or not sensibly) let us have. We flag it all as
149 * Any allocation attempt is satisfied by committing one or more
150 * pages, with an uncommitted page on either side. The returned
151 * memory region is jammed up against the _end_ of the pages.
153 * Freeing anything causes instantaneous decommitment of the pages
154 * involved, so stale pointers are caught as soon as possible.
157 static int minefield_initialised
= 0;
158 static void *minefield_region
= NULL
;
159 static long minefield_size
= 0;
160 static long minefield_npages
= 0;
161 static long minefield_curpos
= 0;
162 static unsigned short *minefield_admin
= NULL
;
163 static void *minefield_pages
= NULL
;
165 static void minefield_admin_hide(int hide
)
167 int access
= hide ? PAGE_NOACCESS
: PAGE_READWRITE
;
168 VirtualProtect(minefield_admin
, minefield_npages
* 2, access
, NULL
);
171 static void minefield_init(void)
177 for (size
= 0x40000000; size
> 0; size
= ((size
>> 3) * 7) & ~0xFFF) {
178 minefield_region
= VirtualAlloc(NULL
, size
,
179 MEM_RESERVE
, PAGE_NOACCESS
);
180 if (minefield_region
)
183 minefield_size
= size
;
186 * Firstly, allocate a section of that to be the admin block.
187 * We'll need a two-byte field for each page.
189 minefield_admin
= minefield_region
;
190 minefield_npages
= minefield_size
/ PAGESIZE
;
191 admin_size
= (minefield_npages
* 2 + PAGESIZE
- 1) & ~(PAGESIZE
- 1);
192 minefield_npages
= (minefield_size
- admin_size
) / PAGESIZE
;
193 minefield_pages
= (char *) minefield_region
+ admin_size
;
196 * Commit the admin region.
198 VirtualAlloc(minefield_admin
, minefield_npages
* 2,
199 MEM_COMMIT
, PAGE_READWRITE
);
202 * Mark all pages as unused (0xFFFF).
204 for (i
= 0; i
< minefield_npages
; i
++)
205 minefield_admin
[i
] = 0xFFFF;
208 * Hide the admin region.
210 minefield_admin_hide(1);
212 minefield_initialised
= 1;
215 static void minefield_bomb(void)
217 div(1, *(int *) minefield_pages
);
220 static void *minefield_alloc(int size
)
223 int pos
, lim
, region_end
, region_start
;
227 npages
= (size
+ PAGESIZE
- 1) / PAGESIZE
;
229 minefield_admin_hide(0);
232 * Search from current position until we find a contiguous
233 * bunch of npages+2 unused pages.
235 pos
= minefield_curpos
;
236 lim
= minefield_npages
;
238 /* Skip over used pages. */
239 while (pos
< lim
&& minefield_admin
[pos
] != 0xFFFF)
241 /* Count unused pages. */
243 while (pos
< lim
&& pos
- start
< npages
+ 2 &&
244 minefield_admin
[pos
] == 0xFFFF)
246 if (pos
- start
== npages
+ 2)
248 /* If we've reached the limit, reset the limit or stop. */
250 if (lim
== minefield_npages
) {
251 /* go round and start again at zero */
252 lim
= minefield_curpos
;
255 minefield_admin_hide(1);
261 minefield_curpos
= pos
- 1;
264 * We have npages+2 unused pages starting at start. We leave
265 * the first and last of these alone and use the rest.
267 region_end
= (start
+ npages
+ 1) * PAGESIZE
;
268 region_start
= region_end
- size
;
269 /* FIXME: could align here if we wanted */
272 * Update the admin region.
274 for (i
= start
+ 2; i
< start
+ npages
+ 1; i
++)
275 minefield_admin
[i
] = 0xFFFE; /* used but no region starts here */
276 minefield_admin
[start
+ 1] = region_start
% PAGESIZE
;
278 minefield_admin_hide(1);
280 VirtualAlloc((char *) minefield_pages
+ region_start
, size
,
281 MEM_COMMIT
, PAGE_READWRITE
);
282 return (char *) minefield_pages
+ region_start
;
285 static void minefield_free(void *ptr
)
287 int region_start
, i
, j
;
289 minefield_admin_hide(0);
291 region_start
= (char *) ptr
- (char *) minefield_pages
;
292 i
= region_start
/ PAGESIZE
;
293 if (i
< 0 || i
>= minefield_npages
||
294 minefield_admin
[i
] != region_start
% PAGESIZE
)
296 for (j
= i
; j
< minefield_npages
&& minefield_admin
[j
] != 0xFFFF; j
++) {
297 minefield_admin
[j
] = 0xFFFF;
300 VirtualFree(ptr
, j
* PAGESIZE
- region_start
, MEM_DECOMMIT
);
302 minefield_admin_hide(1);
305 static int minefield_get_size(void *ptr
)
307 int region_start
, i
, j
;
309 minefield_admin_hide(0);
311 region_start
= (char *) ptr
- (char *) minefield_pages
;
312 i
= region_start
/ PAGESIZE
;
313 if (i
< 0 || i
>= minefield_npages
||
314 minefield_admin
[i
] != region_start
% PAGESIZE
)
316 for (j
= i
; j
< minefield_npages
&& minefield_admin
[j
] != 0xFFFF; j
++);
318 minefield_admin_hide(1);
320 return j
* PAGESIZE
- region_start
;
323 void *minefield_c_malloc(size_t size
)
325 if (!minefield_initialised
)
327 return minefield_alloc(size
);
330 void minefield_c_free(void *p
)
332 if (!minefield_initialised
)
338 * realloc _always_ moves the chunk, for rapid detection of code
339 * that assumes it won't.
341 void *minefield_c_realloc(void *p
, size_t size
)
345 if (!minefield_initialised
)
347 q
= minefield_alloc(size
);
348 oldsize
= minefield_get_size(p
);
349 memcpy(q
, p
, (oldsize
< size ? oldsize
: size
));
354 #endif /* MINEFIELD */