libcxx/src/verbose_abort.cpp

   1 //===----------------------------------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include <__config>
  10 #include <__verbose_abort>
  11 #include <cstdarg>
  12 #include <cstdio>
  13 #include <cstdlib>
  14
  15 #ifdef __BIONIC__
  16 #  include <syslog.h>
  17 extern "C" void android_set_abort_message(const char* msg);
  18 #endif   // __BIONIC__
  19
  20 #if defined(__APPLE__) && __has_include(<CrashReporterClient.h>)
  21 #  include <CrashReporterClient.h>
  22 #endif
  23
  24 _LIBCPP_BEGIN_NAMESPACE_STD
  25
  26 _LIBCPP_WEAK void __libcpp_verbose_abort(char const* format, ...) _LIBCPP_VERBOSE_ABORT_NOEXCEPT {
  27   // Write message to stderr. We do this before formatting into a
  28   // buffer so that we still get some information out if that fails.
  29   {
  30     va_list list;
  31     va_start(list, format);
  32     std::vfprintf(stderr, format, list);
  33     va_end(list);
  34   }
  35
  36   // Format the arguments into an allocated buffer for CrashReport & friends.
  37   // We leak the buffer on purpose, since we're about to abort() anyway.
  38   char* buffer;
  39   (void)buffer;
  40   va_list list;
  41   va_start(list, format);
  42
  43 #if defined(__APPLE__) && __has_include(<CrashReporterClient.h>)
  44   // Note that we should technically synchronize accesses here (by e.g. taking a lock),
  45   // however concretely we're only setting a pointer, so the likelihood of a race here
  46   // is low.
  47   vasprintf(&buffer, format, list);
  48   CRSetCrashLogMessage(buffer);
  49 #elif defined(__BIONIC__)
  50   vasprintf(&buffer, format, list);
  51
  52   // Show error in tombstone.
  53   android_set_abort_message(buffer);
  54
  55   // Show error in logcat.
  56   openlog("libc++", 0, 0);
  57   syslog(LOG_CRIT, "%s", buffer);
  58   closelog();
  59 #endif
  60   va_end(list);
  61
  62   std::abort();
  63 }
  64
  65 _LIBCPP_END_NAMESPACE_STD