Attachment 1190498 Details for Bug 1366730 – dyninst-single-thread.cpp

dyninst-single-thread.cpp

dyninst-single-thread.cpp (text/plain), 1.94 KB, created by Florian Weimer on 2016-08-12 16:09:36 UTC

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Creator: Florian Weimer

Created: 2016-08-12 16:09:36 UTC

Size: 1.94 KB

patch

obsolete

>#include <dyninst/PCProcess.h>
>#include <dyninst/Symtab.h>
>#include <dyninst/Variable.h>
>
>#include <stdlib.h>
>#include <err.h>
>#include <stdio.h>
>
>int
>main(int argc, char **argv)
>{
>  if (argc != 2) {
>    fprintf(stderr, "usage: %s PID\n", argv[0]);
>    return 1;
>  }
>
>  int pid = atoi(argv[1]);
>  if (pid <= 0) {
>    fprintf(stderr, "error: invalid PID: %s\n", argv[1]);
>    return 2;
>  }
>
>  Dyninst::ProcControlAPI::Process::ptr proc
>    {Dyninst::ProcControlAPI::Process::attachProcess(pid)};
>  for (const auto library : proc->libraries()) {
>    printf("Library: %s\n", library->getName().c_str());
>
>    // Obtain the TLS variable offset.
>    Dyninst::Offset tls_offset{};
>    {
>      Dyninst::SymtabAPI::Symtab *symtab;
>      if (!Dyninst::SymtabAPI::Symtab::openFile
>          (symtab, library->getAbsoluteName())) {
>        errx(1, "could not open %s", argv[0]);
>      }
>      std::vector<Dyninst::SymtabAPI::Variable *> vars;
>      if (!symtab->findVariablesByName(vars, "__libc_tsd_MALLOC")
>        || vars.empty()) {
>        if (!symtab->findVariablesByName(vars, "thread_arena")
>            || vars.empty()) {
>          continue;
>        }
>      }
>      bool found = false;
>      for (auto var : vars) {
>        if (var->getFirstSymbol()->getType() == Dyninst::SymtabAPI::Symbol::ST_TLS) {
>          tls_offset = var->getOffset();
>          found = true;
>          break;
>        }
>      }
>      if (!found) {
>        errx(1, "TLS variable not found (2)");
>      }
>    }
>    printf("  TLS variable offset: %llx\n", (unsigned long long) tls_offset);
>
>    for (const auto thread : proc->threads()) {
>      printf("Thread %llx: %d\n", (unsigned long long)thread->getTID(),
>             thread->isRunning());
>      uintptr_t tls_value{};
>      if (!thread->readThreadLocalMemory
>          (&tls_value, library, tls_offset, sizeof(tls_value))) {
>        errx(1, "could not read TLS variable\n");
>      }
>      printf("  variable: %llx\n", (unsigned long long) tls_value);
>    }
>  }
>}

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Attachments on bug 1366730: 1190498