| 1 | /************************************************* |
| 2 | * Exim - an Internet mail transport agent * |
| 3 | *************************************************/ |
| 4 | |
| 5 | /* Cygwin-specific code. December 2002. Updated Jan 2015. |
| 6 | This is prefixed to the src/os.c file. |
| 7 | |
| 8 | This code was supplied by Pierre A. Humblet <Pierre.Humblet@ieee.org> |
| 9 | */ |
| 10 | |
| 11 | /* We need a special mkdir that |
| 12 | allows names starting with // */ |
| 13 | #undef mkdir |
| 14 | int cygwin_mkdir( const char *path, mode_t mode ) |
| 15 | { |
| 16 | const char * p = path; |
| 17 | if (*p == '/') while(*(p+1) == '/') p++; |
| 18 | return mkdir(p, mode); |
| 19 | } |
| 20 | |
| 21 | #ifndef COMPILE_UTILITY /* Utilities don't need special code */ |
| 22 | |
| 23 | #ifdef INCLUDE_PAM |
| 24 | #include "../pam/pam.c" |
| 25 | #endif |
| 26 | #include <alloca.h> |
| 27 | |
| 28 | unsigned int cygwin_WinVersion; |
| 29 | |
| 30 | /* Conflict between Windows definitions and others */ |
| 31 | #ifdef NOERROR |
| 32 | #undef NOERROR |
| 33 | #endif |
| 34 | #ifdef DELETE |
| 35 | #undef DELETE |
| 36 | #endif |
| 37 | |
| 38 | #include <windows.h> |
| 39 | #include <ntstatus.h> |
| 40 | #include <lmcons.h> |
| 41 | |
| 42 | #define EqualLuid(Luid1, Luid2) \ |
| 43 | ((Luid1.LowPart == Luid2.LowPart) && (Luid1.HighPart == Luid2.HighPart)) |
| 44 | #include <sys/cygwin.h> |
| 45 | |
| 46 | /* Special static variables */ |
| 47 | static BOOL cygwin_debug = FALSE; |
| 48 | static int fakesetugid = 1; /* when not privileged, setugid = noop */ |
| 49 | |
| 50 | #undef setuid |
| 51 | int cygwin_setuid(uid_t uid ) |
| 52 | { |
| 53 | int res = 0; |
| 54 | if (fakesetugid == 0) { |
| 55 | res = setuid(uid); |
| 56 | if (cygwin_debug) |
| 57 | fprintf(stderr, "setuid %u %u %d pid: %d\n", |
| 58 | uid, getuid(),res, getpid()); |
| 59 | } |
| 60 | return res; |
| 61 | } |
| 62 | |
| 63 | #undef setgid |
| 64 | int cygwin_setgid(gid_t gid ) |
| 65 | { |
| 66 | int res = 0; |
| 67 | if (fakesetugid == 0) { |
| 68 | res = setgid(gid); |
| 69 | if (cygwin_debug) |
| 70 | fprintf(stderr, "setgid %u %u %d pid: %d\n", |
| 71 | gid, getgid(), res, getpid()); |
| 72 | } |
| 73 | return res; |
| 74 | } |
| 75 | |
| 76 | /* Background processes run at lower priority */ |
| 77 | static void cygwin_setpriority() |
| 78 | { |
| 79 | if (!SetPriorityClass(GetCurrentProcess(), BELOW_NORMAL_PRIORITY_CLASS)) |
| 80 | SetPriorityClass(GetCurrentProcess(), IDLE_PRIORITY_CLASS); |
| 81 | return; |
| 82 | } |
| 83 | |
| 84 | |
| 85 | /* GetVersion() |
| 86 | MSB: 1 for 95/98/ME; Next 7: build number, except for 95/98/ME |
| 87 | Next byte: 0 |
| 88 | Next byte: minor version of OS |
| 89 | Low byte: major version of OS (3 or 4 for for NT, 5 for 2000 and XP) */ |
| 90 | //#define VERSION_IS_58M(x) (x & 0x80000000) /* 95, 98, Me */ |
| 91 | //#define VERSION_IS_NT(x) ((x & 0XFF) < 5) /* NT 4 or 3.51 */ |
| 92 | |
| 93 | /* |
| 94 | Routine to find if process or thread is privileged |
| 95 | */ |
| 96 | |
| 97 | enum { |
| 98 | CREATE_BIT = 1, |
| 99 | }; |
| 100 | |
| 101 | static DWORD get_privileges () |
| 102 | { |
| 103 | char buffer[1024]; |
| 104 | DWORD i, length; |
| 105 | HANDLE hToken = NULL; |
| 106 | PTOKEN_PRIVILEGES privs; |
| 107 | LUID cluid, rluid; |
| 108 | DWORD ret = 0; |
| 109 | |
| 110 | privs = (PTOKEN_PRIVILEGES) buffer; |
| 111 | |
| 112 | if (OpenProcessToken (GetCurrentProcess(), TOKEN_QUERY, &hToken) |
| 113 | && LookupPrivilegeValue (NULL, SE_CREATE_TOKEN_NAME, &cluid) |
| 114 | && LookupPrivilegeValue(NULL, SE_RESTORE_NAME, &rluid) |
| 115 | && (GetTokenInformation( hToken, TokenPrivileges, |
| 116 | privs, sizeof (buffer), &length) |
| 117 | || (GetLastError () == ERROR_INSUFFICIENT_BUFFER |
| 118 | && (privs = (PTOKEN_PRIVILEGES) alloca (length)) |
| 119 | && GetTokenInformation(hToken, TokenPrivileges, |
| 120 | privs, length, &length)))) { |
| 121 | for (i = 0; i < privs->PrivilegeCount; i++) { |
| 122 | if (EqualLuid(privs->Privileges[i].Luid, cluid)) |
| 123 | ret |= CREATE_BIT; |
| 124 | if (ret == (CREATE_BIT)) |
| 125 | break; |
| 126 | } |
| 127 | } |
| 128 | else |
| 129 | fprintf(stderr, "has_create_token_privilege %u\n", GetLastError()); |
| 130 | |
| 131 | if (hToken) |
| 132 | CloseHandle(hToken); |
| 133 | |
| 134 | return ret; |
| 135 | } |
| 136 | |
| 137 | /* |
| 138 | We use cygwin_premain to fake a few things |
| 139 | and to provide some debug info |
| 140 | */ |
| 141 | void cygwin_premain2(int argc, char ** argv, struct per_process * ptr) |
| 142 | { |
| 143 | int i, res, is_daemon = 0, is_spoolwritable, is_privileged, is_eximuser; |
| 144 | uid_t myuid, systemuid; |
| 145 | gid_t mygid, adminsgid; |
| 146 | struct passwd * pwp = NULL; |
| 147 | struct stat buf; |
| 148 | char *cygenv; |
| 149 | SID(1, SystemSid, SECURITY_LOCAL_SYSTEM_RID); |
| 150 | SID(2, AdminsSid, SECURITY_BUILTIN_DOMAIN_RID, DOMAIN_ALIAS_RID_ADMINS); |
| 151 | DWORD priv_flags; |
| 152 | |
| 153 | myuid = getuid(); |
| 154 | mygid = getgid(); |
| 155 | cygwin_WinVersion = GetVersion(); |
| 156 | if ((cygenv = getenv("CYGWIN")) == NULL) cygenv = ""; |
| 157 | /* Produce some debugging on stderr, |
| 158 | cannot yet use exim's debug functions. |
| 159 | Exim does not use -c and ignores -n. |
| 160 | Set lower priority for daemons */ |
| 161 | for (i = 1; i < argc; i++) { |
| 162 | if (argv[i][0] == '-') { |
| 163 | if (argv[i][1] == 'c') { |
| 164 | ssize_t size; |
| 165 | wchar_t *win32_path; |
| 166 | argv[i][1] = 'n'; /* Replace -c by -n */ |
| 167 | cygwin_debug = TRUE; |
| 168 | fprintf(stderr, "CYGWIN = \"%s\".\n", cygenv); |
| 169 | if (((size = cygwin_conv_path(CCP_POSIX_TO_WIN_W,"/", win32_path, 0)) > 0) |
| 170 | && ((win32_path = store_malloc(size)) != NULL) |
| 171 | && (cygwin_conv_path(CCP_POSIX_TO_WIN_W,"/", win32_path, size) == 0)) { |
| 172 | fprintf(stderr, " Root / mapped to %ls.\n", win32_path); |
| 173 | store_free(win32_path); |
| 174 | } |
| 175 | } |
| 176 | else if (argv[i][1] == 'b' && argv[i][2] == 'd') { |
| 177 | is_daemon = 1; |
| 178 | cygwin_setpriority(); |
| 179 | } |
| 180 | } |
| 181 | } |
| 182 | |
| 183 | /* Nt/2000/XP |
| 184 | We initially set the exim uid & gid to those of the "exim user", |
| 185 | or to the root uid (SYSTEM) and exim gid (ADMINS), |
| 186 | If privileged, we setuid to those. |
| 187 | We always set the configure uid to the system uid. |
| 188 | We always set the root uid to the real uid |
| 189 | to allow exim imposed restrictions (bypassable by recompiling) |
| 190 | and to avoid exec that cause loss of privilege |
| 191 | If not privileged and unable to chown, |
| 192 | we set the exim uid to our uid. |
| 193 | If unprivileged and /var/spool/exim is writable and not running as listening daemon, |
| 194 | we fake all subsequent setuid. */ |
| 195 | |
| 196 | /* Get the system and admins uid from their sids */ |
| 197 | if ((systemuid = cygwin_internal(CW_GET_UID_FROM_SID, & SystemSid)) == -1) { |
| 198 | fprintf(stderr, "Cannot map System sid. Aborting\n"); |
| 199 | exit(1); |
| 200 | } |
| 201 | if ((adminsgid = cygwin_internal(CW_GET_GID_FROM_SID, & AdminsSid)) == -1) { |
| 202 | fprintf(stderr, "Cannot map Admins sid. Aborting\n"); |
| 203 | exit(1); |
| 204 | } |
| 205 | |
| 206 | priv_flags = get_privileges (); |
| 207 | is_privileged = !!(priv_flags & CREATE_BIT); |
| 208 | |
| 209 | /* Call getpwnam for account exim after getting the local exim name */ |
| 210 | char exim_username[DNLEN + UNLEN + 2]; |
| 211 | if (cygwin_internal(CW_CYGNAME_FROM_WINNAME, "exim", exim_username, sizeof exim_username) != 0) |
| 212 | pwp = getpwnam (exim_username); |
| 213 | |
| 214 | /* If cannot setuid to exim or and is not the daemon (which is assumed to be |
| 215 | able to chown or to be the exim user) set the exim ugid to our ugid to avoid |
| 216 | chown failures after creating files and to be able to setuid to exim in |
| 217 | exim.c ( "privilege not needed" ). */ |
| 218 | if ((is_privileged == 0) && (!is_daemon)) { |
| 219 | exim_uid = myuid; |
| 220 | exim_gid = mygid; |
| 221 | } |
| 222 | else if (pwp != NULL) { |
| 223 | exim_uid = pwp->pw_uid; /* Set it according to passwd */ |
| 224 | exim_gid = pwp->pw_gid; |
| 225 | is_eximuser = 1; |
| 226 | } |
| 227 | else { |
| 228 | exim_uid = systemuid; |
| 229 | exim_gid = adminsgid; |
| 230 | is_eximuser = 0; |
| 231 | } |
| 232 | |
| 233 | res = stat("/var/spool/exim", &buf); |
| 234 | /* Check if writable (and can be stat) */ |
| 235 | is_spoolwritable = ((res == 0) && ((buf.st_mode & S_IWOTH) != 0)); |
| 236 | |
| 237 | fakesetugid = (is_privileged == 0) && (is_daemon == 0) && (is_spoolwritable == 1); |
| 238 | |
| 239 | if (is_privileged) { /* Can setuid */ |
| 240 | if (cygwin_setgid(exim_gid) /* Setuid to exim */ |
| 241 | || cygwin_setuid(exim_uid)) { |
| 242 | fprintf(stderr, "Unable to setuid/gid to exim. priv_flags: %x\n", priv_flags); |
| 243 | exit(0); /* Problem... Perhaps not in 544 */ |
| 244 | } |
| 245 | } |
| 246 | |
| 247 | /* Set the configuration file uid and gid to the system uid and admins gid. */ |
| 248 | config_uid = systemuid; |
| 249 | config_gid = adminsgid; |
| 250 | |
| 251 | /* Pretend we are root to avoid useless exec |
| 252 | and avoid exim set limitations. |
| 253 | We are limited by file access rights */ |
| 254 | root_uid = getuid (); |
| 255 | |
| 256 | if (cygwin_debug) { |
| 257 | fprintf(stderr, "Starting uid %u, gid %u, priv_flags %x, is_privileged %d, is_daemon %d, is_spoolwritable %d.\n", |
| 258 | myuid, mygid, priv_flags, is_privileged, is_daemon, is_spoolwritable); |
| 259 | fprintf(stderr, "root_uid %u, exim_uid %u, exim_gid %u, config_uid %u, config_gid %u, is_eximuser %d.\n", |
| 260 | root_uid, exim_uid, exim_gid, config_uid, config_gid, is_eximuser); |
| 261 | } |
| 262 | return; |
| 263 | } |
| 264 | |
| 265 | #ifndef OS_LOAD_AVERAGE /* Can be set on command line */ |
| 266 | #define OS_LOAD_AVERAGE /* src/os.c need not provide it */ |
| 267 | |
| 268 | /***************************************************************** |
| 269 | Functions for average load measurements |
| 270 | |
| 271 | Uses NtQuerySystemInformation. |
| 272 | This requires definitions that are not part of |
| 273 | standard include files. |
| 274 | |
| 275 | This is discouraged starting with WinXP. |
| 276 | |
| 277 | *************************************************************/ |
| 278 | /* Structure to compute the load average efficiently */ |
| 279 | typedef struct { |
| 280 | DWORD Lock; |
| 281 | unsigned long long Time100ns; /* Last measurement time */ |
| 282 | unsigned long long IdleCount; /* Latest cumulative idle time */ |
| 283 | unsigned long long LastCounter; /* Last measurement counter */ |
| 284 | unsigned long long PerfFreq; /* Perf counter frequency */ |
| 285 | int LastLoad; /* Last reported load, or -1 */ |
| 286 | } cygwin_perf_t; |
| 287 | |
| 288 | static struct { |
| 289 | HANDLE handle; |
| 290 | pid_t pid; |
| 291 | cygwin_perf_t *perf; |
| 292 | } cygwin_load = {NULL, 0, NULL}; |
| 293 | |
| 294 | #include <ntdef.h> |
| 295 | |
| 296 | typedef enum _SYSTEM_INFORMATION_CLASS |
| 297 | { |
| 298 | SystemBasicInformation = 0, |
| 299 | SystemPerformanceInformation = 2, |
| 300 | SystemTimeOfDayInformation = 3, |
| 301 | SystemProcessesAndThreadsInformation = 5, |
| 302 | SystemProcessorTimes = 8, |
| 303 | SystemPagefileInformation = 18, |
| 304 | /* There are a lot more of these... */ |
| 305 | } SYSTEM_INFORMATION_CLASS; |
| 306 | |
| 307 | typedef struct _SYSTEM_BASIC_INFORMATION |
| 308 | { |
| 309 | ULONG Unknown; |
| 310 | ULONG MaximumIncrement; |
| 311 | ULONG PhysicalPageSize; |
| 312 | ULONG NumberOfPhysicalPages; |
| 313 | ULONG LowestPhysicalPage; |
| 314 | ULONG HighestPhysicalPage; |
| 315 | ULONG AllocationGranularity; |
| 316 | ULONG LowestUserAddress; |
| 317 | ULONG HighestUserAddress; |
| 318 | ULONG ActiveProcessors; |
| 319 | UCHAR NumberProcessors; |
| 320 | } SYSTEM_BASIC_INFORMATION, *PSYSTEM_BASIC_INFORMATION; |
| 321 | |
| 322 | typedef struct __attribute__ ((aligned (8))) _SYSTEM_PROCESSOR_TIMES |
| 323 | { |
| 324 | LARGE_INTEGER IdleTime; |
| 325 | LARGE_INTEGER KernelTime; |
| 326 | LARGE_INTEGER UserTime; |
| 327 | LARGE_INTEGER DpcTime; |
| 328 | LARGE_INTEGER InterruptTime; |
| 329 | ULONG InterruptCount; |
| 330 | } SYSTEM_PROCESSOR_TIMES, *PSYSTEM_PROCESSOR_TIMES; |
| 331 | |
| 332 | typedef NTSTATUS NTAPI (*NtQuerySystemInformation_t) (SYSTEM_INFORMATION_CLASS, PVOID, ULONG, PULONG); |
| 333 | typedef ULONG NTAPI (*RtlNtStatusToDosError_t) (NTSTATUS); |
| 334 | |
| 335 | static NtQuerySystemInformation_t NtQuerySystemInformation; |
| 336 | static RtlNtStatusToDosError_t RtlNtStatusToDosError; |
| 337 | |
| 338 | /***************************************************************** |
| 339 | * |
| 340 | LoadNtdll() |
| 341 | Load special functions from the NTDLL |
| 342 | Return TRUE if success. |
| 343 | |
| 344 | *****************************************************************/ |
| 345 | |
| 346 | static BOOL LoadNtdll() |
| 347 | { |
| 348 | HINSTANCE hinstLib; |
| 349 | |
| 350 | if ((hinstLib = LoadLibrary("NTDLL.DLL")) |
| 351 | && (NtQuerySystemInformation = |
| 352 | (NtQuerySystemInformation_t) GetProcAddress(hinstLib, |
| 353 | "NtQuerySystemInformation")) |
| 354 | && (RtlNtStatusToDosError = |
| 355 | (RtlNtStatusToDosError_t) GetProcAddress(hinstLib, |
| 356 | "RtlNtStatusToDosError"))) |
| 357 | return TRUE; |
| 358 | |
| 359 | DEBUG(D_load) |
| 360 | debug_printf("perf: load: %u (Windows)\n", GetLastError()); |
| 361 | return FALSE; |
| 362 | } |
| 363 | /***************************************************************** |
| 364 | * |
| 365 | ReadStat() |
| 366 | Measures current Time100ns and IdleCount |
| 367 | Return TRUE if success. |
| 368 | |
| 369 | *****************************************************************/ |
| 370 | |
| 371 | static BOOL ReadStat(unsigned long long int *Time100nsPtr, |
| 372 | unsigned long long int *IdleCountPtr) |
| 373 | { |
| 374 | NTSTATUS ret; |
| 375 | SYSTEM_BASIC_INFORMATION sbi; |
| 376 | PSYSTEM_PROCESSOR_TIMES spt; |
| 377 | |
| 378 | *Time100nsPtr = *IdleCountPtr = 0; |
| 379 | |
| 380 | if ((ret = NtQuerySystemInformation(SystemBasicInformation, |
| 381 | (PVOID) &sbi, sizeof sbi, NULL)) |
| 382 | != STATUS_SUCCESS) { |
| 383 | DEBUG(D_load) |
| 384 | debug_printf("Perf: NtQuerySystemInformation: %u (Windows)\n", |
| 385 | RtlNtStatusToDosError(ret)); |
| 386 | } |
| 387 | else if (!(spt = (PSYSTEM_PROCESSOR_TIMES) alloca(sizeof(spt[0]) * sbi.NumberProcessors))) { |
| 388 | DEBUG(D_load) |
| 389 | debug_printf("Perf: alloca: errno %d (%s)\n", errno, strerror(errno)); |
| 390 | } |
| 391 | else if ((ret = NtQuerySystemInformation(SystemProcessorTimes, (PVOID) spt, |
| 392 | sizeof spt[0] * sbi.NumberProcessors, NULL)) |
| 393 | != STATUS_SUCCESS) { |
| 394 | DEBUG(D_load) |
| 395 | debug_printf("Perf: NtQuerySystemInformation: %u (Windows)\n", |
| 396 | RtlNtStatusToDosError(ret)); |
| 397 | } |
| 398 | else { |
| 399 | int i; |
| 400 | for (i = 0; i < sbi.NumberProcessors; i++) { |
| 401 | *Time100nsPtr += spt[i].KernelTime.QuadPart;; |
| 402 | *Time100nsPtr += spt[i].UserTime.QuadPart; |
| 403 | *IdleCountPtr += spt[i].IdleTime.QuadPart; |
| 404 | } |
| 405 | return TRUE; |
| 406 | } |
| 407 | return FALSE; |
| 408 | } |
| 409 | |
| 410 | /***************************************************************** |
| 411 | * |
| 412 | InitLoadAvg() |
| 413 | Initialize the cygwin_load.perf structure. |
| 414 | and set cygwin_load.perf->Flag to TRUE if successful. |
| 415 | This is called the first time os_getloadavg is called |
| 416 | *****************************************************************/ |
| 417 | static void InitLoadAvg(cygwin_perf_t *this) |
| 418 | { |
| 419 | BOOL success = TRUE; |
| 420 | |
| 421 | /* Get perf frequency and counter */ |
| 422 | QueryPerformanceFrequency((LARGE_INTEGER *)& this->PerfFreq); |
| 423 | QueryPerformanceCounter((LARGE_INTEGER *)& this->LastCounter); |
| 424 | |
| 425 | /* Get initial values for Time100ns and IdleCount */ |
| 426 | success = success |
| 427 | && ReadStat( & this->Time100ns, |
| 428 | & this->IdleCount); |
| 429 | /* If success, set the Load to 0, else to -1 */ |
| 430 | if (success) this->LastLoad = 0; |
| 431 | else { |
| 432 | log_write(0, LOG_MAIN, "Cannot obtain Load Average"); |
| 433 | this->LastLoad = -1; |
| 434 | } |
| 435 | } |
| 436 | |
| 437 | |
| 438 | /***************************************************************** |
| 439 | * |
| 440 | os_getloadavg() |
| 441 | |
| 442 | Return -1 if not available; |
| 443 | Return the previous value if less than AVERAGING sec old. |
| 444 | else return the processor load on a [0 - 1000] scale. |
| 445 | |
| 446 | The first time we are called we initialize the counts |
| 447 | and return 0 or -1. |
| 448 | The initial load cannot be measured as we use the processor 100% |
| 449 | *****************************************************************/ |
| 450 | static SECURITY_ATTRIBUTES sa = {sizeof (SECURITY_ATTRIBUTES), NULL, TRUE}; |
| 451 | #define AVERAGING 10 |
| 452 | |
| 453 | int os_getloadavg() |
| 454 | { |
| 455 | unsigned long long Time100ns, IdleCount, CurrCounter; |
| 456 | int value; |
| 457 | pid_t newpid; |
| 458 | |
| 459 | /* New process. |
| 460 | Reload the dlls and the file mapping */ |
| 461 | if ((newpid = getpid()) != cygwin_load.pid) { |
| 462 | BOOL new; |
| 463 | cygwin_load.pid = newpid; |
| 464 | |
| 465 | if (!LoadNtdll()) { |
| 466 | log_write(0, LOG_MAIN, "Cannot obtain Load Average"); |
| 467 | cygwin_load.perf = NULL; |
| 468 | return -1; |
| 469 | } |
| 470 | |
| 471 | if ((new = !cygwin_load.handle)) { |
| 472 | cygwin_load.handle = CreateFileMapping (INVALID_HANDLE_VALUE, &sa, PAGE_READWRITE, |
| 473 | 0, sizeof(cygwin_perf_t), NULL); |
| 474 | DEBUG(D_load) |
| 475 | debug_printf("Perf: CreateFileMapping: handle %p\n", (void *) cygwin_load.handle); |
| 476 | } |
| 477 | cygwin_load.perf = (cygwin_perf_t *) MapViewOfFile (cygwin_load.handle, |
| 478 | FILE_MAP_READ | FILE_MAP_WRITE, 0, 0, 0); |
| 479 | DEBUG(D_load) |
| 480 | debug_printf("Perf: MapViewOfFile: addr %p\n", (void *) cygwin_load.perf); |
| 481 | if (new && cygwin_load.perf) |
| 482 | InitLoadAvg(cygwin_load.perf); |
| 483 | } |
| 484 | |
| 485 | /* Check if initialized OK */ |
| 486 | if (!cygwin_load.perf || cygwin_load.perf->LastLoad < 0) |
| 487 | return -1; |
| 488 | |
| 489 | /* If we cannot get the lock, we return 0. |
| 490 | This is to prevent any lock-up possibility. |
| 491 | Finding a lock busy is unlikely, and giving up only |
| 492 | results in an immediate delivery .*/ |
| 493 | |
| 494 | if (InterlockedCompareExchange(&cygwin_load.perf->Lock, 1, 0)) { |
| 495 | DEBUG(D_load) |
| 496 | debug_printf("Perf: Lock busy\n"); |
| 497 | return 0; |
| 498 | } |
| 499 | |
| 500 | /* Get the current time (PerfCounter) */ |
| 501 | QueryPerformanceCounter((LARGE_INTEGER *)& CurrCounter); |
| 502 | /* Calls closer than AVERAGING sec apart use the previous value */ |
| 503 | if (CurrCounter - cygwin_load.perf->LastCounter > |
| 504 | AVERAGING * cygwin_load.perf->PerfFreq) { |
| 505 | /* Get Time100ns and IdleCount */ |
| 506 | if (ReadStat( & Time100ns, & IdleCount)) { /* Success */ |
| 507 | /* Return processor load on 1000 scale */ |
| 508 | value = 1000 - ((1000 * (IdleCount - cygwin_load.perf->IdleCount)) / |
| 509 | (Time100ns - cygwin_load.perf->Time100ns)); |
| 510 | cygwin_load.perf->Time100ns = Time100ns; |
| 511 | cygwin_load.perf->IdleCount = IdleCount; |
| 512 | cygwin_load.perf->LastCounter = CurrCounter; |
| 513 | cygwin_load.perf->LastLoad = value; |
| 514 | DEBUG(D_load) |
| 515 | debug_printf("Perf: New load average %d\n", value); |
| 516 | } |
| 517 | else { /* Something bad happened. |
| 518 | Refuse to measure the load anymore |
| 519 | but don't bother releasing the buffer */ |
| 520 | log_write(0, LOG_MAIN, "Cannot obtain Load Average"); |
| 521 | cygwin_load.perf->LastLoad = -1; |
| 522 | } |
| 523 | } |
| 524 | else |
| 525 | DEBUG(D_load) |
| 526 | debug_printf("Perf: Old load average %d\n", cygwin_load.perf->LastLoad); |
| 527 | cygwin_load.perf->Lock = 0; |
| 528 | return cygwin_load.perf->LastLoad; |
| 529 | } |
| 530 | #endif /* OS_LOAD_AVERAGE */ |
| 531 | #endif /* COMPILE_UTILITY */ |