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author | David L. Jones <dlj@google.com> | 2017-11-15 01:40:05 +0000 |
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committer | David L. Jones <dlj@google.com> | 2017-11-15 01:40:05 +0000 |
commit | 29961b5a9b00642c770ae522a336cf2cc6077398 (patch) | |
tree | d5d975f68cc9a5b4eaa8df4bca59c298988eaede /lib/sanitizer_common/sanitizer_stoptheworld_linux_libcdep.cc | |
parent | 5cdb7458cb1d6fc8fc83dd5a177658f1284f5d29 (diff) | |
parent | 65964b0190520f92123c3b1adb7dce481179909b (diff) | |
download | compiler-rt-29961b5a9b00642c770ae522a336cf2cc6077398.tar.gz |
Creating branches/google/testing and tags/google/testing/2017-11-14 from r317716google/testing
git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/branches/google/testing@318248 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/sanitizer_common/sanitizer_stoptheworld_linux_libcdep.cc')
-rw-r--r-- | lib/sanitizer_common/sanitizer_stoptheworld_linux_libcdep.cc | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/lib/sanitizer_common/sanitizer_stoptheworld_linux_libcdep.cc b/lib/sanitizer_common/sanitizer_stoptheworld_linux_libcdep.cc index e1cb6f76f..ea864e59e 100644 --- a/lib/sanitizer_common/sanitizer_stoptheworld_linux_libcdep.cc +++ b/lib/sanitizer_common/sanitizer_stoptheworld_linux_libcdep.cc @@ -57,6 +57,14 @@ #include "sanitizer_mutex.h" #include "sanitizer_placement_new.h" +// Sufficiently old kernel headers don't provide this value, but we can still +// call prctl with it. If the runtime kernel is new enough, the prctl call will +// have the desired effect; if the kernel is too old, the call will error and we +// can ignore said error. +#ifndef PR_SET_PTRACER +#define PR_SET_PTRACER 0x59616d61 +#endif + // This module works by spawning a Linux task which then attaches to every // thread in the caller process with ptrace. This suspends the threads, and // PTRACE_GETREGS can then be used to obtain their register state. The callback @@ -433,9 +441,7 @@ void StopTheWorld(StopTheWorldCallback callback, void *argument) { ScopedSetTracerPID scoped_set_tracer_pid(tracer_pid); // On some systems we have to explicitly declare that we want to be traced // by the tracer thread. -#ifdef PR_SET_PTRACER internal_prctl(PR_SET_PTRACER, tracer_pid, 0, 0, 0); -#endif // Allow the tracer thread to start. tracer_thread_argument.mutex.Unlock(); // NOTE: errno is shared between this thread and the tracer thread. |