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1 | /* $Cambridge: exim/src/OS/os.c-cygwin,v 1.1 2004/10/06 15:07:39 ph10 Exp $ */ |
2 | ||
3 | /************************************************* | |
4 | * Exim - an Internet mail transport agent * | |
5 | *************************************************/ | |
6 | ||
7 | /* Cygwin-specific code. December 2002 | |
8 | This is concatenated onto the generic src/os.c file. | |
9 | ||
10 | This code was supplied by Pierre A. Humblet <Pierre.Humblet@ieee.org> | |
11 | */ | |
12 | ||
13 | /* We need a special mkdir that | |
14 | allows names starting with // */ | |
15 | #undef mkdir | |
16 | int cygwin_mkdir( const char *path, mode_t mode ) | |
17 | { | |
18 | const char * p = path; | |
19 | if (*p == '/') while(*(p+1) == '/') p++; | |
20 | return mkdir(p, mode); | |
21 | } | |
22 | ||
23 | /* We have strsignal but cannot use #define | |
24 | because types don't match */ | |
25 | #define OS_STRSIGNAL /* src/os.c need not provide it */ | |
26 | char * os_strsignal(int sig) | |
27 | { | |
28 | return (char *) strsignal(sig); | |
29 | } | |
30 | ||
31 | #ifndef COMPILE_UTILITY /* Utilities don't need special code */ | |
32 | #ifdef INCLUDE_MINIRES | |
33 | #include "../minires/minires.c" | |
34 | #include "../minires/os-interface.c" | |
35 | #endif | |
36 | ||
37 | #ifdef INCLUDE_PAM | |
38 | #include "../pam/pam.c" | |
39 | #endif | |
40 | ||
41 | unsigned int cygwin_WinVersion; | |
42 | ||
43 | /* Conflict between Windows definitions and others */ | |
44 | #ifdef NOERROR | |
45 | #undef NOERROR | |
46 | #endif | |
47 | #ifdef DELETE | |
48 | #undef DELETE | |
49 | #endif | |
50 | ||
51 | #include <windows.h> | |
52 | #include <sys/cygwin.h> | |
53 | ||
54 | /* Special static variables */ | |
55 | static BOOL cygwin_debug = FALSE; | |
56 | static int privileged = 1; /* when not privileged, setuid = noop */ | |
57 | ||
58 | #undef setuid | |
59 | int cygwin_setuid(uid_t uid ) | |
60 | { | |
61 | int res; | |
62 | if (privileged <= 0) return 0; | |
63 | else { | |
64 | res = setuid(uid); | |
65 | if (cygwin_debug) | |
66 | fprintf(stderr, "setuid %lu %lu %d pid: %d\n", | |
67 | uid, getuid(),res, getpid()); | |
68 | } | |
69 | return res; | |
70 | } | |
71 | ||
72 | #undef setgid | |
73 | int cygwin_setgid(gid_t gid ) | |
74 | { | |
75 | int res; | |
76 | if (privileged <= 0) return 0; | |
77 | else { | |
78 | res = setgid(gid); | |
79 | if (cygwin_debug) | |
80 | fprintf(stderr, "setgid %lu %lu %d pid: %d\n", | |
81 | gid, getgid(), res, getpid()); | |
82 | } | |
83 | return res; | |
84 | } | |
85 | ||
86 | /* Background processes run at lower priority */ | |
87 | static void setpriority() | |
88 | { | |
89 | if (!SetPriorityClass(GetCurrentProcess(), BELOW_NORMAL_PRIORITY_CLASS)) | |
90 | SetPriorityClass(GetCurrentProcess(), IDLE_PRIORITY_CLASS); | |
91 | return; | |
92 | } | |
93 | ||
94 | ||
95 | /* GetVersion() | |
96 | MSB: 1 for 95/98/ME; Next 7: build number, except for 95/98/ME | |
97 | Next byte: 0 | |
98 | Next byte: minor version of OS | |
99 | Low byte: major version of OS (3 or 4 for for NT, 5 for 2000 and XP) */ | |
100 | #define VERSION_IS_58M(x) (x & 0x80000000) /* 95, 98, Me */ | |
101 | #define VERSION_IS_NT(x) ((x & 0XFF) < 5) /* NT 4 or 3.51 */ | |
102 | ||
103 | /* | |
104 | Routine to find if process or thread is privileged | |
105 | */ | |
106 | ||
107 | enum { | |
108 | CREATE_BIT = 1, | |
109 | RESTORE_BIT = 2 | |
110 | }; | |
111 | ||
112 | static DWORD get_privileges () | |
113 | { | |
114 | char buffer[1024]; | |
115 | DWORD i, length; | |
116 | HANDLE hToken = NULL; | |
117 | PTOKEN_PRIVILEGES privs; | |
118 | LUID cluid, rluid; | |
119 | DWORD ret = 0; | |
120 | ||
121 | privs = (PTOKEN_PRIVILEGES) buffer; | |
122 | ||
123 | if (OpenProcessToken (GetCurrentProcess(), TOKEN_QUERY, &hToken) | |
124 | && LookupPrivilegeValue (NULL, SE_CREATE_TOKEN_NAME, &cluid) | |
125 | && LookupPrivilegeValue(NULL, SE_RESTORE_NAME, &rluid) | |
126 | && (GetTokenInformation( hToken, TokenPrivileges, | |
127 | privs, sizeof (buffer), &length) | |
128 | || (GetLastError () == ERROR_INSUFFICIENT_BUFFER | |
129 | && (privs = (PTOKEN_PRIVILEGES) alloca (length)) | |
130 | && GetTokenInformation(hToken, TokenPrivileges, | |
131 | privs, length, &length)))) { | |
132 | for (i = 0; i < privs->PrivilegeCount; i++) { | |
133 | if (privs->Privileges[i].Luid.QuadPart == cluid.QuadPart) | |
134 | ret |= CREATE_BIT; | |
135 | else if (privs->Privileges[i].Luid.QuadPart == rluid.QuadPart) | |
136 | ret |= RESTORE_BIT; | |
137 | else continue; | |
138 | if (ret == (CREATE_BIT | RESTORE_BIT)) | |
139 | break; | |
140 | } | |
141 | } | |
142 | else | |
143 | fprintf(stderr, "has_create_token_privilege %ld\n", GetLastError()); | |
144 | ||
145 | if (hToken) | |
146 | CloseHandle(hToken); | |
147 | ||
148 | return ret; | |
149 | } | |
150 | ||
151 | /* We use a special routine to initialize | |
152 | cygwin_init is called from the OS_INIT macro in main(). */ | |
153 | ||
154 | void cygwin_init(int argc, char ** argv, void * rup, | |
155 | void * eup, void * egp, void * cup) | |
156 | { | |
157 | int i; | |
158 | uid_t myuid, systemuid; | |
159 | gid_t mygid, adminsgid; | |
160 | struct passwd * pwp; | |
161 | char *cygenv, win32_path[MAX_PATH]; | |
162 | SID(1, SystemSid, SECURITY_LOCAL_SYSTEM_RID); | |
163 | SID(2, AdminsSid, SECURITY_BUILTIN_DOMAIN_RID, DOMAIN_ALIAS_RID_ADMINS); | |
164 | DWORD priv_flags; | |
165 | ||
166 | myuid = getuid(); | |
167 | mygid = getgid(); | |
168 | cygwin_WinVersion = GetVersion(); | |
169 | if ((cygenv = getenv("CYGWIN")) == NULL) cygenv = ""; | |
170 | /* Produce some debugging on stderr, | |
171 | cannot yet use exim's debug functions. | |
172 | Exim does not use -c and ignores -n. | |
173 | Set lower priority for daemons */ | |
174 | for (i = 1; i < argc; i++) { | |
175 | if (argv[i][0] == '-') { | |
176 | if (argv[i][1] == 'c') { | |
177 | argv[i][1] = 'n'; /* Replace -c by -n */ | |
178 | cygwin_debug = TRUE; | |
179 | fprintf(stderr, "CYGWIN = \"%s\".", cygenv); | |
180 | cygwin_conv_to_win32_path("/", win32_path); | |
181 | fprintf(stderr, " Root / mapped to %s.\n", win32_path); | |
182 | } | |
183 | else if (argv[i][1] == 'b' && argv[i][2] == 'd') | |
184 | setpriority(); | |
185 | } | |
186 | } | |
187 | if (VERSION_IS_58M(cygwin_WinVersion)) { | |
188 | * (uid_t *) rup = myuid; /* Pretend we are root */ | |
189 | * (uid_t *) eup = myuid; /* ... and exim */ | |
190 | * (gid_t *) egp = mygid; | |
191 | return; | |
192 | } | |
193 | /* Nt/2000/XP | |
194 | We initially set the exim uid & gid to those of the "real exim", | |
195 | or to the root uid (SYSTEM) and exim gid (ADMINS), | |
196 | If privileged, we setuid to those. | |
197 | We always set the configure uid to the system uid. | |
198 | We always set the root uid to the real uid | |
199 | to avoid useless execs following forks. | |
200 | If not privileged and unable to chown, | |
201 | we set the exim uid to our uid. | |
202 | If unprivileged, we fake all subsequent setuid. */ | |
203 | ||
204 | priv_flags = get_privileges (); | |
205 | privileged = !!(priv_flags & CREATE_BIT); | |
206 | ||
207 | /* Get the system and admins uid from their sids, | |
208 | or use the default values from the Makefile. */ | |
209 | if ((systemuid = cygwin_internal(CW_GET_UID_FROM_SID, & SystemSid)) == -1) | |
210 | systemuid = * (uid_t *) eup; | |
211 | if ((adminsgid = cygwin_internal(CW_GET_GID_FROM_SID, & AdminsSid)) == -1) | |
212 | adminsgid = * (gid_t *) egp; | |
213 | ||
214 | if ((pwp = getpwnam("exim")) != NULL) { | |
215 | * (uid_t *) eup = pwp->pw_uid; /* Set it according to passwd */ | |
216 | * (gid_t *) egp = pwp->pw_gid; | |
217 | } | |
218 | else { | |
219 | * (uid_t *) eup = systemuid; | |
220 | * (gid_t *) egp = adminsgid; | |
221 | } | |
222 | ||
223 | /* Set the configuration uid to the system uid. | |
224 | Note that exim uid is also accepted as owner of exim.conf. */ | |
225 | * (uid_t *) cup = systemuid; | |
226 | ||
227 | if (privileged) { /* Can setuid */ | |
228 | if (cygwin_setgid(* (gid_t *) egp) /* Setuid to exim */ | |
229 | || cygwin_setuid(* (uid_t *) eup)) | |
230 | privileged = -1; /* Problem... Perhaps not in 544 */ | |
231 | } | |
232 | ||
233 | /* Pretend we are root to avoid useless execs. | |
234 | We are limited by file access rights */ | |
235 | * (uid_t *) rup = getuid (); | |
236 | ||
237 | /* If we have not setuid to exim and cannot chown, | |
238 | set the exim uid to our uid to avoid chown failures */ | |
239 | if (privileged <= 0 && !(priv_flags & RESTORE_BIT)) | |
240 | * (uid_t *) eup = * (uid_t *) rup; | |
241 | ||
242 | if (cygwin_debug) { | |
243 | fprintf(stderr, "Starting uid %ld, gid %ld, ntsec %lu, privileged %d.\n", | |
244 | myuid, mygid, cygwin_internal(CW_CHECK_NTSEC, NULL), privileged); | |
245 | fprintf(stderr, "root_uid %ld, exim_uid %ld, exim_gid %ld, config_uid %ld.\n", | |
246 | * (uid_t *) rup, * (uid_t *) eup, * (gid_t *) egp, * (uid_t *) cup); | |
247 | } | |
248 | return; | |
249 | } | |
250 | ||
251 | /***************************************************************** | |
252 | * | |
253 | Functions for average load measurements | |
254 | ||
255 | Obtaining statistics in Windows is done at a low level by | |
256 | calling registry functions, in particular the key | |
257 | HKEY_PERFORMANCE_DATA on NT and successors. | |
258 | Something equivalent exists on Win95, see Microsoft article | |
259 | HOWTO: Access the Performance Registry Under Windows 95 (Q174631) | |
260 | but it is not implemented here. | |
261 | ||
262 | The list of objects to be polled is specified in the string | |
263 | passed to RegQueryValueEx in ReadStat() below. | |
264 | On NT, all objects are polled even if info about only one is | |
265 | required. This is fixed in Windows 2000. See articles | |
266 | INFO: Perflib Calling Close Procedure in Windows 2000 (Q270127) | |
267 | INFO: Performance Data Changes Between Windows NT 4.0 and Windows | |
268 | 2000 (Q296523) | |
269 | ||
270 | It is unclear to me how the counters are primarily identified. | |
271 | Whether it's by name strings or by the offset of their strings | |
272 | as mapped in X:\Winnt\system32\perfc009.dat [or equivalently as | |
273 | reported by the registry functions in GetNameStrings( ) below]. | |
274 | Microsoft documentation seems to say that both methods should | |
275 | work. | |
276 | ||
277 | In the interest of speed and language independence, the main | |
278 | code below relies on offsets. However if debug is enabled, the | |
279 | code verifies that the names of the corresponding strings are | |
280 | as expected. | |
281 | ||
282 | *****************************************************************/ | |
283 | #ifndef OS_LOAD_AVERAGE /* Can be set on command line */ | |
284 | #define OS_LOAD_AVERAGE /* src/os.c need not provide it */ | |
285 | ||
286 | /* Object and counter indices and names */ | |
287 | #define PROCESSOR_OBJECT_INDEX 238 | |
288 | #define PROCESSOR_OBJECT_STRING "238" | |
289 | #define PROCESSOR_OBJECT_NAME "Processor" | |
290 | #define PROCESSOR_TIME_COUNTER 6 | |
291 | #define PROCESSOR_TIME_NAME "% Processor Time" | |
292 | ||
293 | /* Structure to compute the load average efficiently */ | |
294 | static struct { | |
295 | long long Time100ns; /* Last measurement time */ | |
296 | long long IdleCount; /* Latest cumulative idle time */ | |
297 | long long LastCounter; /* Last measurement counter */ | |
298 | long long PerfFreq; /* Perf counter frequency */ | |
299 | PPERF_DATA_BLOCK PerfData; /* Pointer to a buffer to get the data */ | |
300 | DWORD BufferSize; /* Size of PerfData */ | |
301 | int LastLoad; /* Last reported load, or -1 */ | |
302 | LPSTR * NamesArray; /* Temporary (malloc) buffer for index */ | |
303 | BOOL Init; /* True if initialized */ | |
304 | } cygwin_load = { 0, 0, 0, 0, NULL, 0, 0, NULL, FALSE}; | |
305 | ||
306 | #define BYTEINCREMENT 800 /* Block to add to PerfData */ | |
307 | ||
308 | /***************************************************************** | |
309 | * | |
310 | Macros to navigate through the performance data. | |
311 | ||
312 | *****************************************************************/ | |
313 | #define FirstObject(PerfData)\ | |
314 | ((PPERF_OBJECT_TYPE)((PBYTE)PerfData + PerfData->HeaderLength)) | |
315 | #define NextObject(PerfObj)\ | |
316 | ((PPERF_OBJECT_TYPE)((PBYTE)PerfObj + PerfObj->TotalByteLength)) | |
317 | #define ObjectCounterBlock(PerfObj)\ | |
318 | ((PPERF_COUNTER_BLOCK)(PBYTE)PerfObj + PerfObj->DefinitionLength ) | |
319 | #define FirstInstance(PerfObj )\ | |
320 | ((PPERF_INSTANCE_DEFINITION)((PBYTE)PerfObj + PerfObj->DefinitionLength)) | |
321 | #define InstanceCounterBlock(PerfInst)\ | |
322 | ((PPERF_COUNTER_BLOCK) ((PBYTE)PerfInst + PerfInst->ByteLength )) | |
323 | #define NextInstance(PerfInst )\ | |
324 | ((PPERF_INSTANCE_DEFINITION)((PBYTE)InstanceCounterBlock(PerfInst) + \ | |
325 | InstanceCounterBlock(PerfInst)->ByteLength) ) | |
326 | #define FirstCounter(PerfObj)\ | |
327 | ((PPERF_COUNTER_DEFINITION) ((PBYTE)PerfObj + PerfObj->HeaderLength)) | |
328 | #define NextCounter(PerfCntr)\ | |
329 | ((PPERF_COUNTER_DEFINITION)((PBYTE)PerfCntr + PerfCntr->ByteLength)) | |
330 | ||
331 | /***************************************************************** | |
332 | * | |
333 | Load the counter and object names from the registry | |
334 | to cygwin_load.NameStrings | |
335 | and index them in cygwin_load.NamesArray | |
336 | ||
337 | NameStrings seems to be taken from the file | |
338 | X:\Winnt\system32\perfc009.dat | |
339 | ||
340 | This is used only for name verification during initialization, | |
341 | if DEBUG(D_load) is TRUE. | |
342 | ||
343 | *****************************************************************/ | |
344 | static BOOL GetNameStrings( ) | |
345 | { | |
346 | HKEY hKeyPerflib; // handle to registry key | |
347 | DWORD dwArraySize; // size for array | |
348 | DWORD dwNamesSize; // size for strings | |
349 | LPSTR lpCurrentString; // pointer for enumerating data strings | |
350 | DWORD dwCounter; // current counter index | |
351 | LONG res; | |
352 | ||
353 | /* Get the number of Counter items into dwArraySize. */ | |
354 | if ((res = RegOpenKeyEx( HKEY_LOCAL_MACHINE, | |
355 | "SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Perflib", | |
356 | 0, | |
357 | KEY_QUERY_VALUE, /* KEY_READ, */ | |
358 | &hKeyPerflib)) | |
359 | != ERROR_SUCCESS) { | |
360 | DEBUG(D_load) debug_printf("RegOpenKeyEx (1): error %ld (Windows)\n", res); | |
361 | return FALSE; | |
362 | } | |
363 | dwNamesSize = sizeof(dwArraySize); /* Temporary reuse */ | |
364 | if ((res = RegQueryValueEx( hKeyPerflib, | |
365 | "Last Counter", | |
366 | NULL, | |
367 | NULL, | |
368 | (LPBYTE) &dwArraySize, | |
369 | &dwNamesSize )) | |
370 | != ERROR_SUCCESS) { | |
371 | DEBUG(D_load) debug_printf("RegQueryValueEx (1): error %ld (Windows)\n", res); | |
372 | return FALSE; | |
373 | } | |
374 | RegCloseKey( hKeyPerflib ); | |
375 | /* Open the key containing the counter and object names. */ | |
376 | if ((res = RegOpenKeyEx( HKEY_LOCAL_MACHINE, | |
377 | "SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Perflib\\009", | |
378 | 0, | |
379 | KEY_READ, | |
380 | &hKeyPerflib)) | |
381 | != ERROR_SUCCESS) { | |
382 | DEBUG(D_load) debug_printf("RegOpenKeyEx (2): error %ld (Windows)\n", res); | |
383 | return FALSE; | |
384 | } | |
385 | /* Get the size of the Counter value in the key | |
386 | and then read the value in the tail of NamesArray */ | |
387 | dwNamesSize = 0; | |
388 | lpCurrentString = NULL; | |
389 | while (1) { | |
390 | res = RegQueryValueEx( hKeyPerflib, | |
391 | "Counter", | |
392 | NULL, | |
393 | NULL, | |
394 | (unsigned char *) lpCurrentString, | |
395 | &dwNamesSize); | |
396 | if ((res == ERROR_SUCCESS) && /* Bug (NT 4.0): SUCCESS was returned on first call */ | |
397 | (cygwin_load.NamesArray != NULL)) break; | |
398 | if ((res == ERROR_SUCCESS) || /* but cygwin_load.NamesArrays == NULL */ | |
399 | (res == ERROR_MORE_DATA)) { | |
400 | /* Allocate memory BOTH for the names array and for the counter and object names */ | |
401 | if ((cygwin_load.NamesArray = | |
402 | (LPSTR *) malloc( (dwArraySize + 1) * sizeof(LPSTR) + dwNamesSize * sizeof(CHAR))) | |
403 | != NULL) { | |
404 | /* Point to area for the counter and object names */ | |
405 | lpCurrentString = (LPSTR) & cygwin_load.NamesArray[dwArraySize + 1]; | |
406 | continue; | |
407 | } | |
408 | DEBUG(D_load) debug_printf("Malloc: errno %d (%s)\n", errno, strerror(errno)); | |
409 | } | |
410 | else { /* Serious error */ | |
411 | DEBUG(D_load) debug_printf("RegQueryValueEx (2): error %ld (Windows)\n", res); | |
412 | } | |
413 | return FALSE; | |
414 | } | |
415 | RegCloseKey( hKeyPerflib ); | |
416 | /* Index the names into an array. */ | |
417 | while (*lpCurrentString) { | |
418 | dwCounter = atol( lpCurrentString ); | |
419 | lpCurrentString += (lstrlen(lpCurrentString)+1); | |
420 | cygwin_load.NamesArray[dwCounter] = lpCurrentString; | |
421 | lpCurrentString += (strlen(lpCurrentString)+1); | |
422 | } | |
423 | return TRUE; | |
424 | } | |
425 | ||
426 | /***************************************************************** | |
427 | * | |
428 | Find the value of the Processor Time counter | |
429 | ||
430 | *****************************************************************/ | |
431 | static BOOL ReadTimeCtr(PPERF_OBJECT_TYPE PerfObj, | |
432 | PPERF_COUNTER_DEFINITION CurCntr, | |
433 | PPERF_COUNTER_BLOCK PtrToCntr, | |
434 | unsigned long long * TimePtr){ | |
435 | int j; | |
436 | /* Scan all counters. */ | |
437 | for( j = 0; j < PerfObj->NumCounters; j++ ) { | |
438 | if (CurCntr->CounterNameTitleIndex == PROCESSOR_TIME_COUNTER) { | |
439 | /* Verify it is really the proc time counter */ | |
440 | if ((CurCntr->CounterType != PERF_100NSEC_TIMER_INV) || /* Wrong type */ | |
441 | ((cygwin_load.NamesArray != NULL) && /* Verify name */ | |
442 | (strcmp(cygwin_load.NamesArray[CurCntr->CounterNameTitleIndex], | |
443 | PROCESSOR_TIME_NAME)))) { | |
444 | log_write(0, LOG_MAIN|LOG_PANIC, | |
445 | "Incorrect Perf counter type or name %x %s", | |
446 | (unsigned) CurCntr->CounterType, | |
447 | cygwin_load.NamesArray[CurCntr->CounterNameTitleIndex]); | |
448 | return FALSE; | |
449 | } | |
450 | *TimePtr += *(unsigned long long int *) ((PBYTE) PtrToCntr + CurCntr->CounterOffset); | |
451 | return TRUE; /* return TRUE as soon as we found the counter */ | |
452 | } | |
453 | /* Get the next counter. */ | |
454 | CurCntr = NextCounter( CurCntr ); | |
455 | } | |
456 | return FALSE; | |
457 | } | |
458 | /***************************************************************** | |
459 | * | |
460 | ReadStat() | |
461 | Measures current Time100ns and IdleCount | |
462 | Return TRUE if success. | |
463 | ||
464 | *****************************************************************/ | |
465 | static BOOL ReadStat(long long int *Time100nsPtr, | |
466 | long long int * IdleCountPtr) | |
467 | { | |
468 | PPERF_OBJECT_TYPE PerfObj; | |
469 | PPERF_INSTANCE_DEFINITION PerfInst; | |
470 | PPERF_COUNTER_DEFINITION PerfCntr; | |
471 | PPERF_COUNTER_BLOCK PtrToCntr; | |
472 | DWORD i, k, res; | |
473 | ||
474 | /* Get the performance data for the Processor object | |
475 | There is no need to open a key. | |
476 | We may need to blindly increase the buffer size. | |
477 | BufferSize does not return info but may be changed */ | |
478 | while (1) { | |
479 | DWORD BufferSize = cygwin_load.BufferSize; | |
480 | res = RegQueryValueEx( HKEY_PERFORMANCE_DATA, | |
481 | PROCESSOR_OBJECT_STRING, | |
482 | NULL, | |
483 | NULL, | |
484 | (LPBYTE) cygwin_load.PerfData, | |
485 | &BufferSize ); | |
486 | if (res == ERROR_SUCCESS) break; | |
487 | if (res == ERROR_MORE_DATA ) { | |
488 | /* Increment if necessary to get a buffer that is big enough. */ | |
489 | cygwin_load.BufferSize += BYTEINCREMENT; | |
490 | if ((cygwin_load.PerfData = | |
491 | (PPERF_DATA_BLOCK) realloc( cygwin_load.PerfData, cygwin_load.BufferSize )) | |
492 | != NULL) continue; | |
493 | DEBUG(D_load) debug_printf("Malloc: errno %d (%s)\n", errno, strerror(errno)); | |
494 | } | |
495 | else { /* Serious error */ | |
496 | DEBUG(D_load) debug_printf("RegQueryValueEx (3): error %ld (Windows)\n", res); | |
497 | } | |
498 | return FALSE; | |
499 | } | |
500 | /* Initialize the counters */ | |
501 | *Time100nsPtr = 0; | |
502 | *IdleCountPtr = 0; | |
503 | /* We should only have one object, but write general code just in case. */ | |
504 | PerfObj = FirstObject( cygwin_load.PerfData ); | |
505 | for( i = 0; i < cygwin_load.PerfData->NumObjectTypes; i++ ) { | |
506 | /* We are only interested in the processor object */ | |
507 | if ( PerfObj->ObjectNameTitleIndex == PROCESSOR_OBJECT_INDEX) { | |
508 | /* Possibly verify it is really the Processor object. */ | |
509 | if ((cygwin_load.NamesArray != NULL) && | |
510 | (strcmp(cygwin_load.NamesArray[PerfObj->ObjectNameTitleIndex], | |
511 | PROCESSOR_OBJECT_NAME))) { | |
512 | log_write(0, LOG_MAIN|LOG_PANIC, | |
513 | "Incorrect Perf object name %s", | |
514 | cygwin_load.NamesArray[PerfObj->ObjectNameTitleIndex]); | |
515 | return FALSE; | |
516 | } | |
517 | /* Get the first counter */ | |
518 | PerfCntr = FirstCounter( PerfObj ); | |
519 | /* See if the object has instances. | |
520 | It should, but write general code. */ | |
521 | if( PerfObj->NumInstances != PERF_NO_INSTANCES ) { | |
522 | PerfInst = FirstInstance( PerfObj ); | |
523 | for( k = 0; k < PerfObj->NumInstances; k++ ) { | |
524 | /* There can be several processors. | |
525 | Accumulate both the Time100ns and the idle counter. | |
526 | On Win 2000 I have seen an instance named "_Total". | |
527 | Do not use it. We only use instances with a single | |
528 | character in the name. | |
529 | If we examine the object names, we also look at the instance | |
530 | names and their lengths and issue reports */ | |
531 | if ( cygwin_load.NamesArray != NULL) { | |
532 | CHAR ascii[30]; /* The name is in unicode */ | |
533 | wsprintf(ascii,"%.29lS", | |
534 | (char *)((PBYTE)PerfInst + PerfInst->NameOffset)); | |
535 | log_write(0, LOG_MAIN, | |
536 | "Perf: Found processor instance \"%s\", length %d", | |
537 | ascii, PerfInst->NameLength); | |
538 | if ((PerfInst->NameLength != 4) && | |
539 | (strcmp(ascii, "_Total") != 0)) { | |
540 | log_write(0, LOG_MAIN|LOG_PANIC, | |
541 | "Perf: WARNING: Unexpected processor instance name"); | |
542 | return FALSE; | |
543 | } | |
544 | } | |
545 | if (PerfInst->NameLength == 4) { | |
546 | *Time100nsPtr += cygwin_load.PerfData->PerfTime100nSec.QuadPart; | |
547 | PtrToCntr = InstanceCounterBlock(PerfInst); | |
548 | if (! ReadTimeCtr(PerfObj, PerfCntr, PtrToCntr, IdleCountPtr)) { | |
549 | return FALSE; | |
550 | } | |
551 | } | |
552 | PerfInst = NextInstance( PerfInst ); | |
553 | } | |
554 | return (*Time100nsPtr != 0); /* Something was read */ | |
555 | } | |
556 | else { /* No instance, just the counter data */ | |
557 | *Time100nsPtr = cygwin_load.PerfData->PerfTime100nSec.QuadPart; | |
558 | PtrToCntr = ObjectCounterBlock(PerfObj); | |
559 | return ReadTimeCtr(PerfObj, PerfCntr, PtrToCntr, IdleCountPtr); | |
560 | } | |
561 | } | |
562 | PerfObj = NextObject( PerfObj ); | |
563 | } | |
564 | return FALSE; /* Did not find the Processor object */ | |
565 | } | |
566 | ||
567 | /***************************************************************** | |
568 | * | |
569 | InitLoadAvg() | |
570 | Initialize the cygwin_load structure. | |
571 | and set cygwin_load.Flag to TRUE if successful. | |
572 | This is called the first time os_getloadavg is called | |
573 | *****************************************************************/ | |
574 | static void InitLoadAvg() | |
575 | { | |
576 | BOOL success = TRUE; | |
577 | cygwin_load.Init = TRUE; /* We have run */ | |
578 | /* Get perf frequency and counter */ | |
579 | QueryPerformanceFrequency((LARGE_INTEGER *)& cygwin_load.PerfFreq); | |
580 | QueryPerformanceCounter((LARGE_INTEGER *)& cygwin_load.LastCounter); | |
581 | DEBUG(D_load) { | |
582 | /* Get the name strings through the registry | |
583 | to verify that the object and counter numbers | |
584 | have the names we expect */ | |
585 | success = GetNameStrings(); | |
586 | } | |
587 | /* Get initial values for Time100ns and IdleCount | |
588 | and possibly verify the names */ | |
589 | // success = success && | |
590 | success = ReadStat( & cygwin_load.Time100ns, | |
591 | & cygwin_load.IdleCount); | |
592 | /* If success, set the Load to 0, else to -1 */ | |
593 | if (success) cygwin_load.LastLoad = 0; | |
594 | else { | |
595 | log_write(0, LOG_MAIN, "Cannot obtain Load Average"); | |
596 | cygwin_load.LastLoad = -1; | |
597 | } | |
598 | /* Free the buffer created for debug name verification */ | |
599 | if (cygwin_load.NamesArray != NULL) { | |
600 | free(cygwin_load.NamesArray); | |
601 | cygwin_load.NamesArray = NULL; | |
602 | } | |
603 | } | |
604 | /***************************************************************** | |
605 | * | |
606 | os_getloadavg() | |
607 | ||
608 | Return -1 if not available; | |
609 | Return the previous value if less than AVERAGING sec old. | |
610 | else return the processor load on a [0 - 1000] scale. | |
611 | ||
612 | The first time we are called we initialize the counts | |
613 | and return 0 or -1. | |
614 | The load cannot be measured because we use the processor 100% | |
615 | *****************************************************************/ | |
616 | #define AVERAGING 10 | |
617 | int os_getloadavg() | |
618 | { | |
619 | long long Time100ns, IdleCount, CurrCounter; | |
620 | int value; | |
621 | ||
622 | if (! cygwin_load.Init) InitLoadAvg(); | |
623 | else if (cygwin_load.LastLoad >= 0) { /* Initialized OK */ | |
624 | /* Get the current time (PerfCounter) */ | |
625 | QueryPerformanceCounter((LARGE_INTEGER *)& CurrCounter); | |
626 | /* Calls closer than AVERAGING sec apart use the previous value */ | |
627 | if (CurrCounter - cygwin_load.LastCounter > | |
628 | AVERAGING * cygwin_load.PerfFreq) { | |
629 | /* Get Time100ns and IdleCount */ | |
630 | if (ReadStat( & Time100ns, & IdleCount)) { /* Success */ | |
631 | /* Return processor load on 1000 scale */ | |
632 | value = 1000 - ((1000 * (IdleCount - cygwin_load.IdleCount)) / | |
633 | (Time100ns - cygwin_load.Time100ns)); | |
634 | cygwin_load.Time100ns = Time100ns; | |
635 | cygwin_load.IdleCount = IdleCount; | |
636 | cygwin_load.LastCounter = CurrCounter; | |
637 | cygwin_load.LastLoad = value; | |
638 | } | |
639 | else { /* Something bad happened. | |
640 | Refuse to measure the load anymore | |
641 | but don't bother releasing the buffer */ | |
642 | log_write(0, LOG_MAIN, "Cannot obtain Load Average"); | |
643 | cygwin_load.LastLoad = -1; | |
644 | } | |
645 | } | |
646 | } | |
647 | DEBUG(D_load) | |
648 | debug_printf("Perf: load average = %d\n", cygwin_load.LastLoad); | |
649 | return cygwin_load.LastLoad; | |
650 | } | |
651 | #endif /* OS_LOAD_AVERAGE */ | |
652 | #endif /* COMPILE_UTILITY */ |