lib/msan/lit_tests/ptrace.cc

   1 // RUN: %clangxx_msan -m64 -O0 %s -o %t && %t
   2
   3 #include <assert.h>
   4 #include <stdio.h>
   5 #include <sys/ptrace.h>
   6 #include <sys/types.h>
   7 #include <sys/user.h>
   8 #include <sys/wait.h>
   9 #include <unistd.h>
  10
  11 int main(void) {
  12   pid_t pid;
  13   pid = fork();
  14   if (pid == 0) { // child
  15     ptrace(PTRACE_TRACEME, 0, NULL, NULL);
  16     execl("/bin/true", "true", NULL);
  17   } else {
  18     wait(NULL);
  19     user_regs_struct regs;
  20     int res;
  21     res = ptrace(PTRACE_GETREGS, pid, NULL, &regs);
  22     assert(!res);
  23     if (regs.rip)
  24       printf("%zx\n", regs.rip);
  25
  26     user_fpregs_struct fpregs;
  27     res = ptrace(PTRACE_GETFPREGS, pid, NULL, &fpregs);
  28     assert(!res);
  29     if (fpregs.mxcsr)
  30       printf("%x\n", fpregs.mxcsr);
  31
  32     ptrace(PTRACE_CONT, pid, NULL, NULL);
  33     wait(NULL);
  34   }
  35   return 0;
  36 }