[src/trunk]: src/external/gpl3/gcc/dist/libsanitizer/sanitizer_common Don't r...

[christos <christos%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/0e052db8513d
branches:  trunk
changeset: 999435:0e052db8513d
user:      christos <christos%NetBSD.org@localhost>
date:      Sat Jun 01 17:24:20 2019 +0000

description:
Don't require procfs to be mounted with linux so that <pid>/task is available
and explain why.

diffstat:

 external/gpl3/gcc/dist/libsanitizer/sanitizer_common/sanitizer_linux.cc |  26 ++++++++++
 1 files changed, 26 insertions(+), 0 deletions(-)

diffs (64 lines):

diff -r 1679b0167f0b -r 0e052db8513d external/gpl3/gcc/dist/libsanitizer/sanitizer_common/sanitizer_linux.cc
--- a/external/gpl3/gcc/dist/libsanitizer/sanitizer_common/sanitizer_linux.cc   Sat Jun 01 17:23:29 2019 +0000
+++ b/external/gpl3/gcc/dist/libsanitizer/sanitizer_common/sanitizer_linux.cc   Sat Jun 01 17:24:20 2019 +0000
@@ -854,6 +854,18 @@
     error_(true),
     entry_((struct linux_dirent *)buffer_.data()),
     bytes_read_(0) {
+#if SANITIZER_NETBSD
+  /*
+   * netbsd does not have "tasks". Our lwp's are not like processes, 
+   * and this is used to suspend each task by attaching to them and stopping
+   * them. We do this at the process level, so we hijack the descriptor to
+   * permanently store our pid (the pid to trace and stop), and bytes_read_
+   * to store a copy of it, that we set to -1 once we read it.
+   */
+  descriptor_ = pid;
+  bytes_read_ = pid;
+  error_ = false;
+#else
   char task_directory_path[80];
   internal_snprintf(task_directory_path, sizeof(task_directory_path),
                     "/proc/%d/task/", pid);
@@ -865,9 +877,15 @@
     error_ = false;
     descriptor_ = openrv;
   }
+#endif
 }
 
 int ThreadLister::GetNextTID() {
+#if SANITIZER_NETBSD
+  int tid = bytes_read_;
+  bytes_read_ = -1;
+  return tid;
+#else
   int tid = -1;
   do {
     if (error_)
@@ -882,17 +900,25 @@
     entry_ = (struct linux_dirent *)(((char *)entry_) + entry_->d_reclen);
   } while (tid < 0);
   return tid;
+#endif
 }
 
 void ThreadLister::Reset() {
+#if SANITIZER_NETBSD
+  bytes_read_ = descriptor_;
+  error_ = false;
+#else
   if (error_ || descriptor_ < 0)
     return;
   internal_lseek(descriptor_, 0, SEEK_SET);
+#endif
 }
 
 ThreadLister::~ThreadLister() {
+#ifndef SANITIZER_NETBSD
   if (descriptor_ >= 0)
     internal_close(descriptor_);
+#endif
 }
 
 bool ThreadLister::error() { return error_; }