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      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 }
     37