1 /*
2 * Copyright (c) 2016-present, Przemyslaw Skibinski, Yann Collet, Facebook, Inc.
3 * All rights reserved.
4 *
5 * This source code is licensed under both the BSD-style license (found in the
6 * LICENSE file in the root directory of this source tree) and the GPLv2 (found
7 * in the COPYING file in the root directory of this source tree).
8 * You may select, at your option, one of the above-listed licenses.
9 */
10
11 #if defined (__cplusplus)
12 extern "C" {
13 #endif
14
15
16 /*-****************************************
17 * Dependencies
18 ******************************************/
19 #include "util.h" /* note : ensure that platform.h is included first ! */
20 #include <errno.h>
21 #include <assert.h>
22
23 #if defined(_MSC_VER) || defined(__MINGW32__) || defined (__MSVCRT__)
24 #include <direct.h> /* needed for _mkdir in windows */
25 #endif
26
UTIL_fileExist(const char * filename)27 int UTIL_fileExist(const char* filename)
28 {
29 stat_t statbuf;
30 #if defined(_MSC_VER)
31 int const stat_error = _stat64(filename, &statbuf);
32 #else
33 int const stat_error = stat(filename, &statbuf);
34 #endif
35 return !stat_error;
36 }
37
UTIL_isRegularFile(const char * infilename)38 int UTIL_isRegularFile(const char* infilename)
39 {
40 stat_t statbuf;
41 return UTIL_getFileStat(infilename, &statbuf); /* Only need to know whether it is a regular file */
42 }
43
UTIL_getFileStat(const char * infilename,stat_t * statbuf)44 int UTIL_getFileStat(const char* infilename, stat_t *statbuf)
45 {
46 int r;
47 #if defined(_MSC_VER)
48 r = _stat64(infilename, statbuf);
49 if (r || !(statbuf->st_mode & S_IFREG)) return 0; /* No good... */
50 #else
51 r = stat(infilename, statbuf);
52 if (r || !S_ISREG(statbuf->st_mode)) return 0; /* No good... */
53 #endif
54 return 1;
55 }
56
UTIL_setFileStat(const char * filename,stat_t * statbuf)57 int UTIL_setFileStat(const char *filename, stat_t *statbuf)
58 {
59 int res = 0;
60
61 if (!UTIL_isRegularFile(filename))
62 return -1;
63
64 /* set access and modification times */
65 #if defined(_WIN32) || (PLATFORM_POSIX_VERSION < 200809L)
66 {
67 struct utimbuf timebuf;
68 timebuf.actime = time(NULL);
69 timebuf.modtime = statbuf->st_mtime;
70 res += utime(filename, &timebuf);
71 }
72 #else
73 {
74 /* (atime, mtime) */
75 struct timespec timebuf[2] = { {0, UTIME_NOW} };
76 timebuf[1] = statbuf->st_mtim;
77 res += utimensat(AT_FDCWD, filename, timebuf, 0);
78 }
79 #endif
80
81 #if !defined(_WIN32)
82 res += chown(filename, statbuf->st_uid, statbuf->st_gid); /* Copy ownership */
83 #endif
84
85 res += chmod(filename, statbuf->st_mode & 07777); /* Copy file permissions */
86
87 errno = 0;
88 return -res; /* number of errors is returned */
89 }
90
UTIL_isDirectory(const char * infilename)91 U32 UTIL_isDirectory(const char* infilename)
92 {
93 int r;
94 stat_t statbuf;
95 #if defined(_MSC_VER)
96 r = _stat64(infilename, &statbuf);
97 if (!r && (statbuf.st_mode & _S_IFDIR)) return 1;
98 #else
99 r = stat(infilename, &statbuf);
100 if (!r && S_ISDIR(statbuf.st_mode)) return 1;
101 #endif
102 return 0;
103 }
104
UTIL_compareStr(const void * p1,const void * p2)105 int UTIL_compareStr(const void *p1, const void *p2) {
106 return strcmp(* (char * const *) p1, * (char * const *) p2);
107 }
108
UTIL_isSameFile(const char * fName1,const char * fName2)109 int UTIL_isSameFile(const char* fName1, const char* fName2)
110 {
111 assert(fName1 != NULL); assert(fName2 != NULL);
112 #if defined(_MSC_VER) || defined(_WIN32)
113 /* note : Visual does not support file identification by inode.
114 * inode does not work on Windows, even with a posix layer, like msys2.
115 * The following work-around is limited to detecting exact name repetition only,
116 * aka `filename` is considered different from `subdir/../filename` */
117 return !strcmp(fName1, fName2);
118 #else
119 { stat_t file1Stat;
120 stat_t file2Stat;
121 return UTIL_getFileStat(fName1, &file1Stat)
122 && UTIL_getFileStat(fName2, &file2Stat)
123 && (file1Stat.st_dev == file2Stat.st_dev)
124 && (file1Stat.st_ino == file2Stat.st_ino);
125 }
126 #endif
127 }
128
129 #ifndef _MSC_VER
130 /* Using this to distinguish named pipes */
UTIL_isFIFO(const char * infilename)131 U32 UTIL_isFIFO(const char* infilename)
132 {
133 /* macro guards, as defined in : https://linux.die.net/man/2/lstat */
134 #if PLATFORM_POSIX_VERSION >= 200112L
135 stat_t statbuf;
136 int r = UTIL_getFileStat(infilename, &statbuf);
137 if (!r && S_ISFIFO(statbuf.st_mode)) return 1;
138 #endif
139 (void)infilename;
140 return 0;
141 }
142 #endif
143
UTIL_isLink(const char * infilename)144 U32 UTIL_isLink(const char* infilename)
145 {
146 /* macro guards, as defined in : https://linux.die.net/man/2/lstat */
147 #if PLATFORM_POSIX_VERSION >= 200112L
148 int r;
149 stat_t statbuf;
150 r = lstat(infilename, &statbuf);
151 if (!r && S_ISLNK(statbuf.st_mode)) return 1;
152 #endif
153 (void)infilename;
154 return 0;
155 }
156
UTIL_getFileSize(const char * infilename)157 U64 UTIL_getFileSize(const char* infilename)
158 {
159 if (!UTIL_isRegularFile(infilename)) return UTIL_FILESIZE_UNKNOWN;
160 { int r;
161 #if defined(_MSC_VER)
162 struct __stat64 statbuf;
163 r = _stat64(infilename, &statbuf);
164 if (r || !(statbuf.st_mode & S_IFREG)) return UTIL_FILESIZE_UNKNOWN;
165 #elif defined(__MINGW32__) && defined (__MSVCRT__)
166 struct _stati64 statbuf;
167 r = _stati64(infilename, &statbuf);
168 if (r || !(statbuf.st_mode & S_IFREG)) return UTIL_FILESIZE_UNKNOWN;
169 #else
170 struct stat statbuf;
171 r = stat(infilename, &statbuf);
172 if (r || !S_ISREG(statbuf.st_mode)) return UTIL_FILESIZE_UNKNOWN;
173 #endif
174 return (U64)statbuf.st_size;
175 }
176 }
177
178
UTIL_getTotalFileSize(const char * const * const fileNamesTable,unsigned nbFiles)179 U64 UTIL_getTotalFileSize(const char* const * const fileNamesTable, unsigned nbFiles)
180 {
181 U64 total = 0;
182 int error = 0;
183 unsigned n;
184 for (n=0; n<nbFiles; n++) {
185 U64 const size = UTIL_getFileSize(fileNamesTable[n]);
186 error |= (size == UTIL_FILESIZE_UNKNOWN);
187 total += size;
188 }
189 return error ? UTIL_FILESIZE_UNKNOWN : total;
190 }
191
192 #ifdef _WIN32
UTIL_prepareFileList(const char * dirName,char ** bufStart,size_t * pos,char ** bufEnd,int followLinks)193 int UTIL_prepareFileList(const char *dirName, char** bufStart, size_t* pos, char** bufEnd, int followLinks)
194 {
195 char* path;
196 int dirLength, fnameLength, pathLength, nbFiles = 0;
197 WIN32_FIND_DATAA cFile;
198 HANDLE hFile;
199
200 dirLength = (int)strlen(dirName);
201 path = (char*) malloc(dirLength + 3);
202 if (!path) return 0;
203
204 memcpy(path, dirName, dirLength);
205 path[dirLength] = '\\';
206 path[dirLength+1] = '*';
207 path[dirLength+2] = 0;
208
209 hFile=FindFirstFileA(path, &cFile);
210 if (hFile == INVALID_HANDLE_VALUE) {
211 UTIL_DISPLAYLEVEL(1, "Cannot open directory '%s'\n", dirName);
212 return 0;
213 }
214 free(path);
215
216 do {
217 fnameLength = (int)strlen(cFile.cFileName);
218 path = (char*) malloc(dirLength + fnameLength + 2);
219 if (!path) { FindClose(hFile); return 0; }
220 memcpy(path, dirName, dirLength);
221 path[dirLength] = '\\';
222 memcpy(path+dirLength+1, cFile.cFileName, fnameLength);
223 pathLength = dirLength+1+fnameLength;
224 path[pathLength] = 0;
225 if (cFile.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) {
226 if ( strcmp (cFile.cFileName, "..") == 0
227 || strcmp (cFile.cFileName, ".") == 0 )
228 continue;
229 /* Recursively call "UTIL_prepareFileList" with the new path. */
230 nbFiles += UTIL_prepareFileList(path, bufStart, pos, bufEnd, followLinks);
231 if (*bufStart == NULL) { free(path); FindClose(hFile); return 0; }
232 } else if ( (cFile.dwFileAttributes & FILE_ATTRIBUTE_NORMAL)
233 || (cFile.dwFileAttributes & FILE_ATTRIBUTE_ARCHIVE)
234 || (cFile.dwFileAttributes & FILE_ATTRIBUTE_COMPRESSED) ) {
235 if (*bufStart + *pos + pathLength >= *bufEnd) {
236 ptrdiff_t const newListSize = (*bufEnd - *bufStart) + LIST_SIZE_INCREASE;
237 *bufStart = (char*)UTIL_realloc(*bufStart, newListSize);
238 if (*bufStart == NULL) { free(path); FindClose(hFile); return 0; }
239 *bufEnd = *bufStart + newListSize;
240 }
241 if (*bufStart + *pos + pathLength < *bufEnd) {
242 memcpy(*bufStart + *pos, path, pathLength+1 /* include final \0 */);
243 *pos += pathLength + 1;
244 nbFiles++;
245 }
246 }
247 free(path);
248 } while (FindNextFileA(hFile, &cFile));
249
250 FindClose(hFile);
251 return nbFiles;
252 }
253
254 #elif defined(__linux__) || (PLATFORM_POSIX_VERSION >= 200112L) /* opendir, readdir require POSIX.1-2001 */
255
UTIL_prepareFileList(const char * dirName,char ** bufStart,size_t * pos,char ** bufEnd,int followLinks)256 int UTIL_prepareFileList(const char *dirName, char** bufStart, size_t* pos, char** bufEnd, int followLinks)
257 {
258 DIR *dir;
259 struct dirent *entry;
260 char* path;
261 size_t dirLength, fnameLength, pathLength;
262 int nbFiles = 0;
263
264 if (!(dir = opendir(dirName))) {
265 UTIL_DISPLAYLEVEL(1, "Cannot open directory '%s': %s\n", dirName, strerror(errno));
266 return 0;
267 }
268
269 dirLength = strlen(dirName);
270 errno = 0;
271 while ((entry = readdir(dir)) != NULL) {
272 if (strcmp (entry->d_name, "..") == 0 ||
273 strcmp (entry->d_name, ".") == 0) continue;
274 fnameLength = strlen(entry->d_name);
275 path = (char*) malloc(dirLength + fnameLength + 2);
276 if (!path) { closedir(dir); return 0; }
277 memcpy(path, dirName, dirLength);
278
279 path[dirLength] = '/';
280 memcpy(path+dirLength+1, entry->d_name, fnameLength);
281 pathLength = dirLength+1+fnameLength;
282 path[pathLength] = 0;
283
284 if (!followLinks && UTIL_isLink(path)) {
285 UTIL_DISPLAYLEVEL(2, "Warning : %s is a symbolic link, ignoring\n", path);
286 free(path);
287 continue;
288 }
289
290 if (UTIL_isDirectory(path)) {
291 nbFiles += UTIL_prepareFileList(path, bufStart, pos, bufEnd, followLinks); /* Recursively call "UTIL_prepareFileList" with the new path. */
292 if (*bufStart == NULL) { free(path); closedir(dir); return 0; }
293 } else {
294 if (*bufStart + *pos + pathLength >= *bufEnd) {
295 ptrdiff_t newListSize = (*bufEnd - *bufStart) + LIST_SIZE_INCREASE;
296 assert(newListSize >= 0);
297 *bufStart = (char*)UTIL_realloc(*bufStart, (size_t)newListSize);
298 *bufEnd = *bufStart + newListSize;
299 if (*bufStart == NULL) { free(path); closedir(dir); return 0; }
300 }
301 if (*bufStart + *pos + pathLength < *bufEnd) {
302 memcpy(*bufStart + *pos, path, pathLength + 1); /* with final \0 */
303 *pos += pathLength + 1;
304 nbFiles++;
305 }
306 }
307 free(path);
308 errno = 0; /* clear errno after UTIL_isDirectory, UTIL_prepareFileList */
309 }
310
311 if (errno != 0) {
312 UTIL_DISPLAYLEVEL(1, "readdir(%s) error: %s\n", dirName, strerror(errno));
313 free(*bufStart);
314 *bufStart = NULL;
315 }
316 closedir(dir);
317 return nbFiles;
318 }
319
320 #else
321
UTIL_prepareFileList(const char * dirName,char ** bufStart,size_t * pos,char ** bufEnd,int followLinks)322 int UTIL_prepareFileList(const char *dirName, char** bufStart, size_t* pos, char** bufEnd, int followLinks)
323 {
324 (void)bufStart; (void)bufEnd; (void)pos; (void)followLinks;
325 UTIL_DISPLAYLEVEL(1, "Directory %s ignored (compiled without _WIN32 or _POSIX_C_SOURCE)\n", dirName);
326 return 0;
327 }
328
329 #endif /* #ifdef _WIN32 */
330
UTIL_isCompressedFile(const char * inputName,const char * extensionList[])331 int UTIL_isCompressedFile(const char *inputName, const char *extensionList[])
332 {
333 const char* ext = UTIL_getFileExtension(inputName);
334 while(*extensionList!=NULL)
335 {
336 const int isCompressedExtension = strcmp(ext,*extensionList);
337 if(isCompressedExtension==0)
338 return 1;
339 ++extensionList;
340 }
341 return 0;
342 }
343
344 /*Utility function to get file extension from file */
UTIL_getFileExtension(const char * infilename)345 const char* UTIL_getFileExtension(const char* infilename)
346 {
347 const char* extension = strrchr(infilename, '.');
348 if(!extension || extension==infilename) return "";
349 return extension;
350 }
351
352 /*
353 * UTIL_createFileList - takes a list of files and directories (params: inputNames, inputNamesNb), scans directories,
354 * and returns a new list of files (params: return value, allocatedBuffer, allocatedNamesNb).
355 * After finishing usage of the list the structures should be freed with UTIL_freeFileList(params: return value, allocatedBuffer)
356 * In case of error UTIL_createFileList returns NULL and UTIL_freeFileList should not be called.
357 */
358 const char**
UTIL_createFileList(const char ** inputNames,unsigned inputNamesNb,char ** allocatedBuffer,unsigned * allocatedNamesNb,int followLinks)359 UTIL_createFileList(const char **inputNames, unsigned inputNamesNb,
360 char** allocatedBuffer, unsigned* allocatedNamesNb,
361 int followLinks)
362 {
363 size_t pos;
364 unsigned i, nbFiles;
365 char* buf = (char*)malloc(LIST_SIZE_INCREASE);
366 char* bufend = buf + LIST_SIZE_INCREASE;
367
368 if (!buf) return NULL;
369
370 for (i=0, pos=0, nbFiles=0; i<inputNamesNb; i++) {
371 if (!UTIL_isDirectory(inputNames[i])) {
372 size_t const len = strlen(inputNames[i]);
373 if (buf + pos + len >= bufend) {
374 ptrdiff_t newListSize = (bufend - buf) + LIST_SIZE_INCREASE;
375 assert(newListSize >= 0);
376 buf = (char*)UTIL_realloc(buf, (size_t)newListSize);
377 bufend = buf + newListSize;
378 if (!buf) return NULL;
379 }
380 if (buf + pos + len < bufend) {
381 memcpy(buf+pos, inputNames[i], len+1); /* including final \0 */
382 pos += len + 1;
383 nbFiles++;
384 }
385 } else {
386 nbFiles += (unsigned)UTIL_prepareFileList(inputNames[i], &buf, &pos, &bufend, followLinks);
387 if (buf == NULL) return NULL;
388 } }
389
390 if (nbFiles == 0) { free(buf); return NULL; }
391
392 { const char** const fileTable = (const char**)malloc((nbFiles + 1) * sizeof(*fileTable));
393 if (!fileTable) { free(buf); return NULL; }
394
395 for (i = 0, pos = 0; i < nbFiles; i++) {
396 fileTable[i] = buf + pos;
397 if (buf + pos > bufend) { free(buf); free((void*)fileTable); return NULL; }
398 pos += strlen(fileTable[i]) + 1;
399 }
400
401 *allocatedBuffer = buf;
402 *allocatedNamesNb = nbFiles;
403
404 return fileTable;
405 }
406 }
407
408
409 /*-****************************************
410 * Console log
411 ******************************************/
412 int g_utilDisplayLevel;
413
414
415
416 /*-****************************************
417 * count the number of physical cores
418 ******************************************/
419
420 #if defined(_WIN32) || defined(WIN32)
421
422 #include <windows.h>
423
424 typedef BOOL(WINAPI* LPFN_GLPI)(PSYSTEM_LOGICAL_PROCESSOR_INFORMATION, PDWORD);
425
UTIL_countPhysicalCores(void)426 int UTIL_countPhysicalCores(void)
427 {
428 static int numPhysicalCores = 0;
429 if (numPhysicalCores != 0) return numPhysicalCores;
430
431 { LPFN_GLPI glpi;
432 BOOL done = FALSE;
433 PSYSTEM_LOGICAL_PROCESSOR_INFORMATION buffer = NULL;
434 PSYSTEM_LOGICAL_PROCESSOR_INFORMATION ptr = NULL;
435 DWORD returnLength = 0;
436 size_t byteOffset = 0;
437
438 #if defined(_MSC_VER)
439 /* Visual Studio does not like the following cast */
440 # pragma warning( disable : 4054 ) /* conversion from function ptr to data ptr */
441 # pragma warning( disable : 4055 ) /* conversion from data ptr to function ptr */
442 #endif
443 glpi = (LPFN_GLPI)(void*)GetProcAddress(GetModuleHandle(TEXT("kernel32")),
444 "GetLogicalProcessorInformation");
445
446 if (glpi == NULL) {
447 goto failed;
448 }
449
450 while(!done) {
451 DWORD rc = glpi(buffer, &returnLength);
452 if (FALSE == rc) {
453 if (GetLastError() == ERROR_INSUFFICIENT_BUFFER) {
454 if (buffer)
455 free(buffer);
456 buffer = (PSYSTEM_LOGICAL_PROCESSOR_INFORMATION)malloc(returnLength);
457
458 if (buffer == NULL) {
459 perror("zstd");
460 exit(1);
461 }
462 } else {
463 /* some other error */
464 goto failed;
465 }
466 } else {
467 done = TRUE;
468 }
469 }
470
471 ptr = buffer;
472
473 while (byteOffset + sizeof(SYSTEM_LOGICAL_PROCESSOR_INFORMATION) <= returnLength) {
474
475 if (ptr->Relationship == RelationProcessorCore) {
476 numPhysicalCores++;
477 }
478
479 ptr++;
480 byteOffset += sizeof(SYSTEM_LOGICAL_PROCESSOR_INFORMATION);
481 }
482
483 free(buffer);
484
485 return numPhysicalCores;
486 }
487
488 failed:
489 /* try to fall back on GetSystemInfo */
490 { SYSTEM_INFO sysinfo;
491 GetSystemInfo(&sysinfo);
492 numPhysicalCores = sysinfo.dwNumberOfProcessors;
493 if (numPhysicalCores == 0) numPhysicalCores = 1; /* just in case */
494 }
495 return numPhysicalCores;
496 }
497
498 #elif defined(__APPLE__)
499
500 #include <sys/sysctl.h>
501
502 /* Use apple-provided syscall
503 * see: man 3 sysctl */
UTIL_countPhysicalCores(void)504 int UTIL_countPhysicalCores(void)
505 {
506 static S32 numPhysicalCores = 0; /* apple specifies int32_t */
507 if (numPhysicalCores != 0) return numPhysicalCores;
508
509 { size_t size = sizeof(S32);
510 int const ret = sysctlbyname("hw.physicalcpu", &numPhysicalCores, &size, NULL, 0);
511 if (ret != 0) {
512 if (errno == ENOENT) {
513 /* entry not present, fall back on 1 */
514 numPhysicalCores = 1;
515 } else {
516 perror("zstd: can't get number of physical cpus");
517 exit(1);
518 }
519 }
520
521 return numPhysicalCores;
522 }
523 }
524
525 #elif defined(__linux__)
526
527 /* parse /proc/cpuinfo
528 * siblings / cpu cores should give hyperthreading ratio
529 * otherwise fall back on sysconf */
UTIL_countPhysicalCores(void)530 int UTIL_countPhysicalCores(void)
531 {
532 static int numPhysicalCores = 0;
533
534 if (numPhysicalCores != 0) return numPhysicalCores;
535
536 numPhysicalCores = (int)sysconf(_SC_NPROCESSORS_ONLN);
537 if (numPhysicalCores == -1) {
538 /* value not queryable, fall back on 1 */
539 return numPhysicalCores = 1;
540 }
541
542 /* try to determine if there's hyperthreading */
543 { FILE* const cpuinfo = fopen("/proc/cpuinfo", "r");
544 #define BUF_SIZE 80
545 char buff[BUF_SIZE];
546
547 int siblings = 0;
548 int cpu_cores = 0;
549 int ratio = 1;
550
551 if (cpuinfo == NULL) {
552 /* fall back on the sysconf value */
553 return numPhysicalCores;
554 }
555
556 /* assume the cpu cores/siblings values will be constant across all
557 * present processors */
558 while (!feof(cpuinfo)) {
559 if (fgets(buff, BUF_SIZE, cpuinfo) != NULL) {
560 if (strncmp(buff, "siblings", 8) == 0) {
561 const char* const sep = strchr(buff, ':');
562 if (sep == NULL || *sep == '\0') {
563 /* formatting was broken? */
564 goto failed;
565 }
566
567 siblings = atoi(sep + 1);
568 }
569 if (strncmp(buff, "cpu cores", 9) == 0) {
570 const char* const sep = strchr(buff, ':');
571 if (sep == NULL || *sep == '\0') {
572 /* formatting was broken? */
573 goto failed;
574 }
575
576 cpu_cores = atoi(sep + 1);
577 }
578 } else if (ferror(cpuinfo)) {
579 /* fall back on the sysconf value */
580 goto failed;
581 }
582 }
583 if (siblings && cpu_cores) {
584 ratio = siblings / cpu_cores;
585 }
586 failed:
587 fclose(cpuinfo);
588 return numPhysicalCores = numPhysicalCores / ratio;
589 }
590 }
591
592 #elif defined(__FreeBSD__)
593
594 #include <sys/param.h>
595 #include <sys/sysctl.h>
596
597 /* Use physical core sysctl when available
598 * see: man 4 smp, man 3 sysctl */
UTIL_countPhysicalCores(void)599 int UTIL_countPhysicalCores(void)
600 {
601 static int numPhysicalCores = 0; /* freebsd sysctl is native int sized */
602 if (numPhysicalCores != 0) return numPhysicalCores;
603
604 #if __FreeBSD_version >= 1300008
605 { size_t size = sizeof(numPhysicalCores);
606 int ret = sysctlbyname("kern.smp.cores", &numPhysicalCores, &size, NULL, 0);
607 if (ret == 0) return numPhysicalCores;
608 if (errno != ENOENT) {
609 perror("zstd: can't get number of physical cpus");
610 exit(1);
611 }
612 /* sysctl not present, fall through to older sysconf method */
613 }
614 #endif
615
616 numPhysicalCores = (int)sysconf(_SC_NPROCESSORS_ONLN);
617 if (numPhysicalCores == -1) {
618 /* value not queryable, fall back on 1 */
619 numPhysicalCores = 1;
620 }
621 return numPhysicalCores;
622 }
623
624 #elif defined(__NetBSD__) || defined(__OpenBSD__) || defined(__DragonFly__)
625
626 /* Use POSIX sysconf
627 * see: man 3 sysconf */
UTIL_countPhysicalCores(void)628 int UTIL_countPhysicalCores(void)
629 {
630 static int numPhysicalCores = 0;
631
632 if (numPhysicalCores != 0) return numPhysicalCores;
633
634 numPhysicalCores = (int)sysconf(_SC_NPROCESSORS_ONLN);
635 if (numPhysicalCores == -1) {
636 /* value not queryable, fall back on 1 */
637 return numPhysicalCores = 1;
638 }
639 return numPhysicalCores;
640 }
641
642 #else
643
UTIL_countPhysicalCores(void)644 int UTIL_countPhysicalCores(void)
645 {
646 /* assume 1 */
647 return 1;
648 }
649
650 #endif
651
652 #if defined (__cplusplus)
653 }
654 #endif
655