user: 请将这段汇编代码片段转换成等效的C代码：

```asm
<main>:
  endbr64
  push   %r13
  xor    %edx,%edx
  mov    $0xffffffff,%esi
  push   %r12
  push   %rbx
  sub    $0x60,%rsp
  mov    D47(%rip),%r13
  mov    %fs:0x28,%rax
  mov    %rax,0x58(%rsp)
  xor    %eax,%eax
  lea    0xc(%rsp),%r12
  movl   $0x0,0xc(%rsp)
  mov    0x0(%r13),%edi
  mov    %r12,%rcx
  call   <syscall@plt>
  mov    0x0(%r13),%edi
  mov    %r12,%rcx
  xor    %eax,%eax
  mov    D50(%rip),%rbx
  mov    $0xffffffff,%edx
  mov    (%rbx),%esi
  call   <syscall@plt>
  mov    (%rbx),%esi
  mov    0x0(%r13),%edi
  mov    $0xffffffff,%ecx
  xor    %edx,%edx
  xor    %eax,%eax
  lea    0x30(%rsp),%r13
  call   <syscall@plt>
  mov    (%rbx),%edi
  mov    %r12,%rdx
  xor    %esi,%esi
  lea    0x10(%rsp),%r12
  call   <timer_create@plt>
  mov    %r12,%rdx
  mov    $0xffffffff,%esi
  xor    %eax,%eax
  mov    D20(%rip),%rbx
  mov    (%rbx),%edi
  call   <syscall@plt>
  mov    (%rbx),%edi
  mov    0xc(%rsp),%esi
  mov    $0xffffffff,%edx
  xor    %eax,%eax
  call   <syscall@plt>
  mov    0xc(%rsp),%edi
  mov    %r12,%rsi
  call   <timer_gettime@plt>
  mov    D51(%rip),%rbx
  xor    %edx,%edx
  xor    %eax,%eax
  mov    %r13,%r8
  mov    %r12,%rcx
  mov    $0xffffffff,%esi
  movq   $0x0,0x28(%rsp)
  movq   $0x0,0x20(%rsp)
  mov    (%rbx),%edi
  movq   $0x0,0x18(%rsp)
  movq   $0x0,0x10(%rsp)
  call   <syscall@plt>
  mov    (%rbx),%edi
  xor    %esi,%esi
  mov    %r13,%r8
  mov    %r12,%rcx
  mov    $0xffffffff,%edx
  xor    %eax,%eax
  call   <syscall@plt>
  mov    0xc(%rsp),%esi
  mov    (%rbx),%edi
  xor    %edx,%edx
  mov    %r13,%r8
  mov    $0xffffffff,%ecx
  xor    %eax,%eax
  call   <syscall@plt>
  mov    0xc(%rsp),%esi
  mov    (%rbx),%edi
  xor    %edx,%edx
  mov    $0xffffffff,%r8d
  mov    %r12,%rcx
  xor    %eax,%eax
  call   <syscall@plt>
  mov    0xc(%rsp),%edi
  mov    %r13,%rcx
  mov    %r12,%rdx
  mov    $0xffffffff,%esi
  call   <timer_settime@plt>
  mov    D4(%rip),%rax
  mov    $0xffffffff,%esi
  mov    (%rax),%edi
  xor    %eax,%eax
  call   <syscall@plt>
  mov    0xc(%rsp),%edi
  call   <timer_getoverrun@plt>
  mov    D33(%rip),%rax
  mov    $0xffffffff,%esi
  mov    (%rax),%edi
  xor    %eax,%eax
  call   <syscall@plt>
  mov    0xc(%rsp),%edi
  call   <timer_delete@plt>
  mov    0x58(%rsp),%rax
  sub    %fs:0x28,%rax
  jne    L0
  add    $0x60,%rsp
  xor    %eax,%eax
  pop    %rbx
  pop    %r12
  pop    %r13
  ret
L0:
  call   <__stack_chk_fail@plt>
```

assistant: ```c
int main() {
  timer_t tid = 0;
  struct itimerspec val, oval;
  syscall(__NR_timer_create, -1, NULL, &tid);
  syscall(__NR_timer_create, CLOCK_REALTIME, -1, &tid);
  syscall(__NR_timer_create, CLOCK_REALTIME, NULL, -1);
  timer_create(CLOCK_REALTIME, NULL, &tid);
  syscall(__NR_timer_gettime, -1, &val);
  syscall(__NR_timer_gettime, tid, -1);
  timer_gettime(tid, &val);
  val.it_value.tv_sec = 0;
  val.it_value.tv_nsec = 0;
  val.it_interval.tv_sec = 0;
  val.it_interval.tv_nsec = 0;
  syscall(__NR_timer_settime, -1, 0, &val, &oval);
  syscall(__NR_timer_settime, 0, -1, &val, &oval);
  syscall(__NR_timer_settime, tid, 0, -1, &oval);
  syscall(__NR_timer_settime, tid, 0, &val, -1);
  timer_settime(tid, -1, &val, &oval);
  syscall(__NR_timer_getoverrun, -1);
  timer_getoverrun(tid);
  syscall(__NR_timer_delete, -1);
  timer_delete(tid);
  return 0;
}
```