libsanitizer/tsan/tsan_printf.cc

   1 //===-- tsan_printf.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 a part of ThreadSanitizer (TSan), a race detector.
   9 //
  10 //===----------------------------------------------------------------------===//
  11
  12 #include "sanitizer_common/sanitizer_common.h"
  13 #include "sanitizer_common/sanitizer_libc.h"
  14 #include "tsan_defs.h"
  15 #include "tsan_mman.h"
  16 #include "tsan_platform.h"
  17
  18 #include <stdarg.h>  // va_list
  19
  20 namespace __sanitizer {
  21 int VSNPrintf(char *buff, int buff_length, const char *format, va_list args);
  22 }  // namespace __sanitizer
  23
  24 namespace __tsan {
  25
  26 void TsanPrintf(const char *format, ...) {
  27   ScopedInRtl in_rtl;
  28   const uptr kMaxLen = 16 * 1024;
  29   InternalScopedBuffer<char> buffer(kMaxLen);
  30   va_list args;
  31   va_start(args, format);
  32   uptr len = VSNPrintf(buffer.data(), buffer.size(), format, args);
  33   va_end(args);
  34   internal_write(CTX() ? flags()->log_fileno : 2,
  35       buffer.data(), len < buffer.size() ? len : buffer.size() - 1);
  36 }
  37
  38 }  // namespace __tsan