1 //===-- sanitizer_linux_libcdep.cc ----------------------------------------===// 2 // 3 // This file is distributed under the University of Illinois Open Source 4 // License. See LICENSE.TXT for details. 5 // 6 //===----------------------------------------------------------------------===// 7 // 8 // This file is shared between AddressSanitizer and ThreadSanitizer 9 // run-time libraries and implements linux-specific functions from 10 // sanitizer_libc.h. 11 //===----------------------------------------------------------------------===// 12 13 #include "sanitizer_platform.h" 14 15 #if SANITIZER_FREEBSD || SANITIZER_LINUX || SANITIZER_NETBSD 16 17 #include "sanitizer_allocator_internal.h" 18 #include "sanitizer_atomic.h" 19 #include "sanitizer_common.h" 20 #include "sanitizer_file.h" 21 #include "sanitizer_flags.h" 22 #include "sanitizer_freebsd.h" 23 #include "sanitizer_linux.h" 24 #include "sanitizer_placement_new.h" 25 #include "sanitizer_procmaps.h" 26 #include "sanitizer_stacktrace.h" 27 28 #include <dlfcn.h> // for dlsym() 29 #include <link.h> 30 #include <pthread.h> 31 #include <signal.h> 32 #include <sys/resource.h> 33 #include <syslog.h> 34 35 #if SANITIZER_FREEBSD 36 #include <pthread_np.h> 37 #include <osreldate.h> 38 #define pthread_getattr_np pthread_attr_get_np 39 #endif 40 41 #if SANITIZER_LINUX 42 #include <sys/prctl.h> 43 #endif 44 45 #if SANITIZER_ANDROID 46 #include <android/api-level.h> 47 #endif 48 49 #if SANITIZER_ANDROID && __ANDROID_API__ < 21 50 #include <android/log.h> 51 #endif 52 53 #if !SANITIZER_ANDROID 54 #include <elf.h> 55 #include <unistd.h> 56 #endif 57 58 namespace __sanitizer { 59 60 SANITIZER_WEAK_ATTRIBUTE int 61 real_sigaction(int signum, const void *act, void *oldact); 62 63 int internal_sigaction(int signum, const void *act, void *oldact) { 64 #if !SANITIZER_GO 65 if (&real_sigaction) 66 return real_sigaction(signum, act, oldact); 67 #endif 68 return sigaction(signum, (const struct sigaction *)act, 69 (struct sigaction *)oldact); 70 } 71 72 void GetThreadStackTopAndBottom(bool at_initialization, uptr *stack_top, 73 uptr *stack_bottom) { 74 CHECK(stack_top); 75 CHECK(stack_bottom); 76 if (at_initialization) { 77 // This is the main thread. Libpthread may not be initialized yet. 78 struct rlimit rl; 79 CHECK_EQ(getrlimit(RLIMIT_STACK, &rl), 0); 80 81 // Find the mapping that contains a stack variable. 82 MemoryMappingLayout proc_maps(/*cache_enabled*/true); 83 MemoryMappedSegment segment; 84 uptr prev_end = 0; 85 while (proc_maps.Next(&segment)) { 86 if ((uptr)&rl < segment.end) break; 87 prev_end = segment.end; 88 } 89 CHECK((uptr)&rl >= segment.start && (uptr)&rl < segment.end); 90 91 // Get stacksize from rlimit, but clip it so that it does not overlap 92 // with other mappings. 93 uptr stacksize = rl.rlim_cur; 94 if (stacksize > segment.end - prev_end) stacksize = segment.end - prev_end; 95 // When running with unlimited stack size, we still want to set some limit. 96 // The unlimited stack size is caused by 'ulimit -s unlimited'. 97 // Also, for some reason, GNU make spawns subprocesses with unlimited stack. 98 if (stacksize > kMaxThreadStackSize) 99 stacksize = kMaxThreadStackSize; 100 *stack_top = segment.end; 101 *stack_bottom = segment.end - stacksize; 102 return; 103 } 104 pthread_attr_t attr; 105 pthread_attr_init(&attr); 106 CHECK_EQ(pthread_getattr_np(pthread_self(), &attr), 0); 107 uptr stacksize = 0; 108 void *stackaddr = nullptr; 109 my_pthread_attr_getstack(&attr, &stackaddr, &stacksize); 110 pthread_attr_destroy(&attr); 111 112 *stack_top = (uptr)stackaddr + stacksize; 113 *stack_bottom = (uptr)stackaddr; 114 } 115 116 #if !SANITIZER_GO 117 bool SetEnv(const char *name, const char *value) { 118 void *f = dlsym(RTLD_NEXT, "setenv"); 119 if (!f) 120 return false; 121 typedef int(*setenv_ft)(const char *name, const char *value, int overwrite); 122 setenv_ft setenv_f; 123 CHECK_EQ(sizeof(setenv_f), sizeof(f)); 124 internal_memcpy(&setenv_f, &f, sizeof(f)); 125 return setenv_f(name, value, 1) == 0; 126 } 127 #endif 128 129 bool SanitizerSetThreadName(const char *name) { 130 #ifdef PR_SET_NAME 131 return 0 == prctl(PR_SET_NAME, (unsigned long)name, 0, 0, 0); // NOLINT 132 #else 133 return false; 134 #endif 135 } 136 137 bool SanitizerGetThreadName(char *name, int max_len) { 138 #ifdef PR_GET_NAME 139 char buff[17]; 140 if (prctl(PR_GET_NAME, (unsigned long)buff, 0, 0, 0)) // NOLINT 141 return false; 142 internal_strncpy(name, buff, max_len); 143 name[max_len] = 0; 144 return true; 145 #else 146 return false; 147 #endif 148 } 149 150 #ifndef __GLIBC_PREREQ 151 #define __GLIBC_PREREQ(x, y) 0 152 #endif 153 154 #if !SANITIZER_FREEBSD && !SANITIZER_ANDROID && !SANITIZER_GO && \ 155 !SANITIZER_NETBSD 156 static uptr g_tls_size; 157 158 #if defined(__mips__) || defined(__powerpc64__) 159 // TlsPreTcbSize includes size of struct pthread_descr and size of tcb 160 // head structure. It lies before the static tls blocks. 161 static uptr TlsPreTcbSize() { 162 # if defined(__mips__) 163 const uptr kTcbHead = 16; // sizeof (tcbhead_t) 164 # elif defined(__powerpc64__) 165 const uptr kTcbHead = 88; // sizeof (tcbhead_t) 166 # endif 167 const uptr kTlsAlign = 16; 168 const uptr kTlsPreTcbSize = 169 (ThreadDescriptorSize() + kTcbHead + kTlsAlign - 1) & ~(kTlsAlign - 1); 170 InitTlsSize(); 171 g_tls_size = (g_tls_size + kTlsPreTcbSize + kTlsAlign -1) & ~(kTlsAlign - 1); 172 return kTlsPreTcbSize; 173 } 174 #endif 175 176 void InitTlsSize() { 177 // all current supported platforms have 16 bytes stack alignment 178 const size_t kStackAlign = 16; 179 size_t tls_size = 0; 180 size_t tls_align = 0; 181 void *get_tls_static_info_ptr = dlsym(RTLD_NEXT, "_dl_get_tls_static_info"); 182 #if defined(__i386__) && !__GLIBC_PREREQ(2, 27) 183 /* On i?86, _dl_get_tls_static_info used to be internal_function, i.e. 184 __attribute__((regparm(3), stdcall)) before glibc 2.27 and is normal 185 function in 2.27 and later. */ 186 if (!dlvsym(RTLD_NEXT, "glob", "GLIBC_2.27")) { 187 typedef void (*get_tls_func)(size_t*, size_t*) 188 __attribute__((regparm(3), stdcall)); 189 get_tls_func get_tls; 190 CHECK_EQ(sizeof(get_tls), sizeof(get_tls_static_info_ptr)); 191 internal_memcpy(&get_tls, &get_tls_static_info_ptr, 192 sizeof(get_tls_static_info_ptr)); 193 CHECK_NE(get_tls, 0); 194 get_tls(&tls_size, &tls_align); 195 } else 196 #endif 197 { 198 typedef void (*get_tls_func)(size_t*, size_t*); 199 get_tls_func get_tls; 200 CHECK_EQ(sizeof(get_tls), sizeof(get_tls_static_info_ptr)); 201 internal_memcpy(&get_tls, &get_tls_static_info_ptr, 202 sizeof(get_tls_static_info_ptr)); 203 CHECK_NE(get_tls, 0); 204 get_tls(&tls_size, &tls_align); 205 } 206 if (tls_align < kStackAlign) 207 tls_align = kStackAlign; 208 g_tls_size = RoundUpTo(tls_size, tls_align); 209 } 210 #else 211 void InitTlsSize() { } 212 #endif // !SANITIZER_FREEBSD && !SANITIZER_ANDROID && !SANITIZER_GO && 213 // !SANITIZER_NETBSD 214 215 #if (defined(__x86_64__) || defined(__i386__) || defined(__mips__) \ 216 || defined(__aarch64__) || defined(__powerpc64__) || defined(__s390__) \ 217 || defined(__arm__)) && SANITIZER_LINUX && !SANITIZER_ANDROID 218 // sizeof(struct pthread) from glibc. 219 static atomic_uintptr_t kThreadDescriptorSize; 220 221 uptr ThreadDescriptorSize() { 222 uptr val = atomic_load(&kThreadDescriptorSize, memory_order_relaxed); 223 if (val) 224 return val; 225 #if defined(__x86_64__) || defined(__i386__) || defined(__arm__) 226 #ifdef _CS_GNU_LIBC_VERSION 227 char buf[64]; 228 uptr len = confstr(_CS_GNU_LIBC_VERSION, buf, sizeof(buf)); 229 if (len < sizeof(buf) && internal_strncmp(buf, "glibc 2.", 8) == 0) { 230 char *end; 231 int minor = internal_simple_strtoll(buf + 8, &end, 10); 232 if (end != buf + 8 && (*end == '\0' || *end == '.' || *end == '-')) { 233 int patch = 0; 234 if (*end == '.') 235 // strtoll will return 0 if no valid conversion could be performed 236 patch = internal_simple_strtoll(end + 1, nullptr, 10); 237 238 /* sizeof(struct pthread) values from various glibc versions. */ 239 if (SANITIZER_X32) 240 val = 1728; // Assume only one particular version for x32. 241 // For ARM sizeof(struct pthread) changed in Glibc 2.23. 242 else if (SANITIZER_ARM) 243 val = minor <= 22 ? 1120 : 1216; 244 else if (minor <= 3) 245 val = FIRST_32_SECOND_64(1104, 1696); 246 else if (minor == 4) 247 val = FIRST_32_SECOND_64(1120, 1728); 248 else if (minor == 5) 249 val = FIRST_32_SECOND_64(1136, 1728); 250 else if (minor <= 9) 251 val = FIRST_32_SECOND_64(1136, 1712); 252 else if (minor == 10) 253 val = FIRST_32_SECOND_64(1168, 1776); 254 else if (minor == 11 || (minor == 12 && patch == 1)) 255 val = FIRST_32_SECOND_64(1168, 2288); 256 else if (minor <= 14) 257 val = FIRST_32_SECOND_64(1168, 2304); 258 else 259 val = FIRST_32_SECOND_64(1216, 2304); 260 } 261 if (val) 262 atomic_store(&kThreadDescriptorSize, val, memory_order_relaxed); 263 return val; 264 } 265 #endif 266 #elif defined(__mips__) 267 // TODO(sagarthakur): add more values as per different glibc versions. 268 val = FIRST_32_SECOND_64(1152, 1776); 269 if (val) 270 atomic_store(&kThreadDescriptorSize, val, memory_order_relaxed); 271 return val; 272 #elif defined(__aarch64__) 273 // The sizeof (struct pthread) is the same from GLIBC 2.17 to 2.22. 274 val = 1776; 275 atomic_store(&kThreadDescriptorSize, val, memory_order_relaxed); 276 return val; 277 #elif defined(__powerpc64__) 278 val = 1776; // from glibc.ppc64le 2.20-8.fc21 279 atomic_store(&kThreadDescriptorSize, val, memory_order_relaxed); 280 return val; 281 #elif defined(__s390__) 282 val = FIRST_32_SECOND_64(1152, 1776); // valid for glibc 2.22 283 atomic_store(&kThreadDescriptorSize, val, memory_order_relaxed); 284 #endif 285 return 0; 286 } 287 288 // The offset at which pointer to self is located in the thread descriptor. 289 const uptr kThreadSelfOffset = FIRST_32_SECOND_64(8, 16); 290 291 uptr ThreadSelfOffset() { 292 return kThreadSelfOffset; 293 } 294 295 #if defined(__mips__) || defined(__powerpc64__) 296 // TlsPreTcbSize includes size of struct pthread_descr and size of tcb 297 // head structure. It lies before the static tls blocks. 298 static uptr TlsPreTcbSize() { 299 # if defined(__mips__) 300 const uptr kTcbHead = 16; // sizeof (tcbhead_t) 301 # elif defined(__powerpc64__) 302 const uptr kTcbHead = 88; // sizeof (tcbhead_t) 303 # endif 304 const uptr kTlsAlign = 16; 305 const uptr kTlsPreTcbSize = 306 RoundUpTo(ThreadDescriptorSize() + kTcbHead, kTlsAlign); 307 return kTlsPreTcbSize; 308 } 309 #endif 310 311 uptr ThreadSelf() { 312 uptr descr_addr; 313 # if defined(__i386__) 314 asm("mov %%gs:%c1,%0" : "=r"(descr_addr) : "i"(kThreadSelfOffset)); 315 # elif defined(__x86_64__) 316 asm("mov %%fs:%c1,%0" : "=r"(descr_addr) : "i"(kThreadSelfOffset)); 317 # elif defined(__mips__) 318 // MIPS uses TLS variant I. The thread pointer (in hardware register $29) 319 // points to the end of the TCB + 0x7000. The pthread_descr structure is 320 // immediately in front of the TCB. TlsPreTcbSize() includes the size of the 321 // TCB and the size of pthread_descr. 322 const uptr kTlsTcbOffset = 0x7000; 323 uptr thread_pointer; 324 asm volatile(".set push;\ 325 .set mips64r2;\ 326 rdhwr %0,$29;\ 327 .set pop" : "=r" (thread_pointer)); 328 descr_addr = thread_pointer - kTlsTcbOffset - TlsPreTcbSize(); 329 # elif defined(__aarch64__) || defined(__arm__) 330 descr_addr = reinterpret_cast<uptr>(__builtin_thread_pointer()) - 331 ThreadDescriptorSize(); 332 # elif defined(__s390__) 333 descr_addr = reinterpret_cast<uptr>(__builtin_thread_pointer()); 334 # elif defined(__powerpc64__) 335 // PPC64LE uses TLS variant I. The thread pointer (in GPR 13) 336 // points to the end of the TCB + 0x7000. The pthread_descr structure is 337 // immediately in front of the TCB. TlsPreTcbSize() includes the size of the 338 // TCB and the size of pthread_descr. 339 const uptr kTlsTcbOffset = 0x7000; 340 uptr thread_pointer; 341 asm("addi %0,13,%1" : "=r"(thread_pointer) : "I"(-kTlsTcbOffset)); 342 descr_addr = thread_pointer - TlsPreTcbSize(); 343 # else 344 # error "unsupported CPU arch" 345 # endif 346 return descr_addr; 347 } 348 #endif // (x86_64 || i386 || MIPS) && SANITIZER_LINUX 349 350 #if SANITIZER_FREEBSD 351 static void **ThreadSelfSegbase() { 352 void **segbase = 0; 353 # if defined(__i386__) 354 // sysarch(I386_GET_GSBASE, segbase); 355 __asm __volatile("mov %%gs:0, %0" : "=r" (segbase)); 356 # elif defined(__x86_64__) 357 // sysarch(AMD64_GET_FSBASE, segbase); 358 __asm __volatile("movq %%fs:0, %0" : "=r" (segbase)); 359 # else 360 # error "unsupported CPU arch for FreeBSD platform" 361 # endif 362 return segbase; 363 } 364 365 uptr ThreadSelf() { 366 return (uptr)ThreadSelfSegbase()[2]; 367 } 368 #elif SANITIZER_NETBSD 369 uptr ThreadSelf() { return (uptr)pthread_self(); } 370 #endif // SANITIZER_NETBSD 371 372 #if !SANITIZER_GO 373 static void GetTls(uptr *addr, uptr *size) { 374 #if SANITIZER_LINUX && !SANITIZER_ANDROID 375 # if defined(__x86_64__) || defined(__i386__) || defined(__s390__) 376 *addr = ThreadSelf(); 377 *size = GetTlsSize(); 378 *addr -= *size; 379 *addr += ThreadDescriptorSize(); 380 # elif defined(__mips__) || defined(__aarch64__) || defined(__powerpc64__) \ 381 || defined(__arm__) 382 *addr = ThreadSelf(); 383 *size = GetTlsSize(); 384 # else 385 *addr = 0; 386 *size = 0; 387 # endif 388 #elif SANITIZER_FREEBSD 389 void** segbase = ThreadSelfSegbase(); 390 *addr = 0; 391 *size = 0; 392 if (segbase != 0) { 393 // tcbalign = 16 394 // tls_size = round(tls_static_space, tcbalign); 395 // dtv = segbase[1]; 396 // dtv[2] = segbase - tls_static_space; 397 void **dtv = (void**) segbase[1]; 398 *addr = (uptr) dtv[2]; 399 *size = (*addr == 0) ? 0 : ((uptr) segbase[0] - (uptr) dtv[2]); 400 } 401 #elif SANITIZER_NETBSD 402 // XXX: for now 403 *addr = 0; 404 *size = 0; 405 #elif SANITIZER_ANDROID 406 *addr = 0; 407 *size = 0; 408 #else 409 # error "Unknown OS" 410 #endif 411 } 412 #endif 413 414 #if !SANITIZER_GO 415 uptr GetTlsSize() { 416 #if SANITIZER_FREEBSD || SANITIZER_ANDROID || SANITIZER_NETBSD 417 uptr addr, size; 418 GetTls(&addr, &size); 419 return size; 420 #elif defined(__mips__) || defined(__powerpc64__) 421 return RoundUpTo(g_tls_size + TlsPreTcbSize(), 16); 422 #else 423 return g_tls_size; 424 #endif 425 } 426 #endif 427 428 void GetThreadStackAndTls(bool main, uptr *stk_addr, uptr *stk_size, 429 uptr *tls_addr, uptr *tls_size) { 430 #if SANITIZER_GO 431 // Stub implementation for Go. 432 *stk_addr = *stk_size = *tls_addr = *tls_size = 0; 433 #else 434 GetTls(tls_addr, tls_size); 435 436 uptr stack_top, stack_bottom; 437 GetThreadStackTopAndBottom(main, &stack_top, &stack_bottom); 438 *stk_addr = stack_bottom; 439 *stk_size = stack_top - stack_bottom; 440 441 if (!main) { 442 // If stack and tls intersect, make them non-intersecting. 443 if (*tls_addr > *stk_addr && *tls_addr < *stk_addr + *stk_size) { 444 CHECK_GT(*tls_addr + *tls_size, *stk_addr); 445 CHECK_LE(*tls_addr + *tls_size, *stk_addr + *stk_size); 446 *stk_size -= *tls_size; 447 *tls_addr = *stk_addr + *stk_size; 448 } 449 } 450 #endif 451 } 452 453 # if !SANITIZER_FREEBSD || SANITIZER_NETBSD 454 typedef ElfW(Phdr) Elf_Phdr; 455 # elif SANITIZER_WORDSIZE == 32 && __FreeBSD_version <= 902001 // v9.2 456 # define Elf_Phdr XElf32_Phdr 457 # define dl_phdr_info xdl_phdr_info 458 # define dl_iterate_phdr(c, b) xdl_iterate_phdr((c), (b)) 459 # endif 460 461 struct DlIteratePhdrData { 462 InternalMmapVectorNoCtor<LoadedModule> *modules; 463 bool first; 464 }; 465 466 static int dl_iterate_phdr_cb(dl_phdr_info *info, size_t size, void *arg) { 467 DlIteratePhdrData *data = (DlIteratePhdrData*)arg; 468 InternalScopedString module_name(kMaxPathLength); 469 if (data->first) { 470 data->first = false; 471 // First module is the binary itself. 472 ReadBinaryNameCached(module_name.data(), module_name.size()); 473 } else if (info->dlpi_name) { 474 module_name.append("%s", info->dlpi_name); 475 } 476 if (module_name[0] == '\0') 477 return 0; 478 LoadedModule cur_module; 479 cur_module.set(module_name.data(), info->dlpi_addr); 480 for (int i = 0; i < info->dlpi_phnum; i++) { 481 const Elf_Phdr *phdr = &info->dlpi_phdr[i]; 482 if (phdr->p_type == PT_LOAD) { 483 uptr cur_beg = info->dlpi_addr + phdr->p_vaddr; 484 uptr cur_end = cur_beg + phdr->p_memsz; 485 bool executable = phdr->p_flags & PF_X; 486 bool writable = phdr->p_flags & PF_W; 487 cur_module.addAddressRange(cur_beg, cur_end, executable, 488 writable); 489 } 490 } 491 data->modules->push_back(cur_module); 492 return 0; 493 } 494 495 #if SANITIZER_ANDROID && __ANDROID_API__ < 21 496 extern "C" __attribute__((weak)) int dl_iterate_phdr( 497 int (*)(struct dl_phdr_info *, size_t, void *), void *); 498 #endif 499 500 static bool requiresProcmaps() { 501 #if SANITIZER_ANDROID && __ANDROID_API__ <= 22 502 // Fall back to /proc/maps if dl_iterate_phdr is unavailable or broken. 503 // The runtime check allows the same library to work with 504 // both K and L (and future) Android releases. 505 return AndroidGetApiLevel() <= ANDROID_LOLLIPOP_MR1; 506 #else 507 return false; 508 #endif 509 } 510 511 static void procmapsInit(InternalMmapVectorNoCtor<LoadedModule> *modules) { 512 MemoryMappingLayout memory_mapping(/*cache_enabled*/true); 513 memory_mapping.DumpListOfModules(modules); 514 } 515 516 void ListOfModules::init() { 517 clearOrInit(); 518 if (requiresProcmaps()) { 519 procmapsInit(&modules_); 520 } else { 521 DlIteratePhdrData data = {&modules_, true}; 522 dl_iterate_phdr(dl_iterate_phdr_cb, &data); 523 } 524 } 525 526 // When a custom loader is used, dl_iterate_phdr may not contain the full 527 // list of modules. Allow callers to fall back to using procmaps. 528 void ListOfModules::fallbackInit() { 529 if (!requiresProcmaps()) { 530 clearOrInit(); 531 procmapsInit(&modules_); 532 } else { 533 clear(); 534 } 535 } 536 537 // getrusage does not give us the current RSS, only the max RSS. 538 // Still, this is better than nothing if /proc/self/statm is not available 539 // for some reason, e.g. due to a sandbox. 540 static uptr GetRSSFromGetrusage() { 541 struct rusage usage; 542 if (getrusage(RUSAGE_SELF, &usage)) // Failed, probably due to a sandbox. 543 return 0; 544 return usage.ru_maxrss << 10; // ru_maxrss is in Kb. 545 } 546 547 uptr GetRSS() { 548 if (!common_flags()->can_use_proc_maps_statm) 549 return GetRSSFromGetrusage(); 550 fd_t fd = OpenFile("/proc/self/statm", RdOnly); 551 if (fd == kInvalidFd) 552 return GetRSSFromGetrusage(); 553 char buf[64]; 554 uptr len = internal_read(fd, buf, sizeof(buf) - 1); 555 internal_close(fd); 556 if ((sptr)len <= 0) 557 return 0; 558 buf[len] = 0; 559 // The format of the file is: 560 // 1084 89 69 11 0 79 0 561 // We need the second number which is RSS in pages. 562 char *pos = buf; 563 // Skip the first number. 564 while (*pos >= '0' && *pos <= '9') 565 pos++; 566 // Skip whitespaces. 567 while (!(*pos >= '0' && *pos <= '9') && *pos != 0) 568 pos++; 569 // Read the number. 570 uptr rss = 0; 571 while (*pos >= '0' && *pos <= '9') 572 rss = rss * 10 + *pos++ - '0'; 573 return rss * GetPageSizeCached(); 574 } 575 576 // 64-bit Android targets don't provide the deprecated __android_log_write. 577 // Starting with the L release, syslog() works and is preferable to 578 // __android_log_write. 579 #if SANITIZER_LINUX 580 581 #if SANITIZER_ANDROID 582 static atomic_uint8_t android_log_initialized; 583 584 void AndroidLogInit() { 585 openlog(GetProcessName(), 0, LOG_USER); 586 atomic_store(&android_log_initialized, 1, memory_order_release); 587 } 588 589 static bool ShouldLogAfterPrintf() { 590 return atomic_load(&android_log_initialized, memory_order_acquire); 591 } 592 #else 593 void AndroidLogInit() {} 594 595 static bool ShouldLogAfterPrintf() { return true; } 596 #endif // SANITIZER_ANDROID 597 598 void WriteOneLineToSyslog(const char *s) { 599 #if SANITIZER_ANDROID &&__ANDROID_API__ < 21 600 __android_log_write(ANDROID_LOG_INFO, NULL, s); 601 #else 602 syslog(LOG_INFO, "%s", s); 603 #endif 604 } 605 606 void LogMessageOnPrintf(const char *str) { 607 if (common_flags()->log_to_syslog && ShouldLogAfterPrintf()) 608 WriteToSyslog(str); 609 } 610 611 #if SANITIZER_ANDROID 612 extern "C" __attribute__((weak)) void android_set_abort_message(const char *); 613 void SetAbortMessage(const char *str) { 614 if (&android_set_abort_message) android_set_abort_message(str); 615 } 616 #else 617 void SetAbortMessage(const char *str) {} 618 #endif 619 620 #endif // SANITIZER_LINUX 621 622 } // namespace __sanitizer 623 624 #endif // SANITIZER_FREEBSD || SANITIZER_LINUX || SANITIZER_NETBSD 625