Function ContainsGateVMA

src/butil/debug/proc_maps_linux.cc:31–43

Scans |proc_maps| starting from |pos| returning true if the gate VMA was found, otherwise returns false.

// Scans |proc_maps| starting from |pos| returning true if the gate VMA was
// found, otherwise returns false.
static bool ContainsGateVMA(std::string* proc_maps, size_t pos) {
#if defined(ARCH_CPU_ARM_FAMILY)
  // The gate VMA on ARM kernels is the interrupt vectors page.
  return proc_maps->find(" [vectors]\n", pos) != std::string::npos;
#elif defined(ARCH_CPU_X86_64)
  // The gate VMA on x86 64-bit kernels is the virtual system call page.
  return proc_maps->find(" [vsyscall]\n", pos) != std::string::npos;
#else
  // Otherwise assume there is no gate VMA in which case we shouldn't
  // get duplicate entires.
  return false;
#endif
}

bool ReadProcMaps(std::string* proc_maps) {
  // seq_file only writes out a page-sized amount on each call. Refer to header