user: Demonstrate the C code that generates the assembly output below:

```asm
<spcLockFile>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x30,%rsp
  mov    %rdi,-0x28(%rbp)
  mov    %fs:0x28,%rax
  mov    %rax,-0x8(%rbp)
  xor    %eax,%eax
  movl   $0x0,-0x14(%rbp)
  jmp    L63
L167:
  mov    D51(%rip),%rax
  mov    (%rax),%edx
  mov    D15(%rip),%rax
  mov    (%rax),%ecx
  mov    D73(%rip),%rax
  mov    (%rax),%eax
  or     %eax,%ecx
  mov    D36(%rip),%rax
  mov    (%rax),%eax
  or     %eax,%ecx
  mov    -0x28(%rbp),%rax
  mov    %ecx,%esi
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <open@plt>
  mov    %eax,-0x10(%rbp)
  cmpl   $0xffffffff,-0x10(%rbp)
  jne    L100
  mov    D20(%rip),%rax
  mov    (%rax),%rdx
  mov    D37(%rip),%rax
  mov    (%rax),%rax
  cmp    %rax,%rdx
  je     L112
  mov    $0xffffffff,%eax
  jmp    L142
L112:
  mov    D1(%rip),%rax
  mov    (%rax),%edx
  mov    -0x28(%rbp),%rax
  mov    %edx,%esi
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <open@plt>
  mov    %eax,-0x10(%rbp)
  cmpl   $0xffffffff,-0x10(%rbp)
  jne    L8
  mov    $0xffffffff,%eax
  jmp    L142
L8:
  lea    -0x18(%rbp),%rcx
  mov    -0x10(%rbp),%eax
  mov    $0x4,%edx
  mov    %rcx,%rsi
  mov    %eax,%edi
  call   <readData@plt>
  mov    %eax,-0xc(%rbp)
  mov    -0x10(%rbp),%eax
  mov    %eax,%edi
  call   <close@plt>
  cmpl   $0x0,-0xc(%rbp)
  je     L119
  mov    $0x0,%eax
  call   <getpid@plt>
  mov    -0x18(%rbp),%edx
  cmp    %edx,%eax
  jne    L7
  mov    $0x1,%eax
  jmp    L142
L7:
  mov    -0x18(%rbp),%eax
  mov    $0x0,%esi
  mov    %eax,%edi
  call   <kill@plt>
  cmp    $0xffffffff,%eax
  jne    L119
  mov    D20(%rip),%rax
  mov    (%rax),%rdx
  mov    D48(%rip),%rax
  mov    (%rax),%rax
  cmp    %rax,%rdx
  je     L61
  mov    $0xffffffff,%eax
  jmp    L142
L61:
  subl   $0x1,-0x14(%rbp)
  mov    -0x28(%rbp),%rax
  mov    %rax,%rdi
  call   <unlink@plt>
  jmp    L80
L119:
  mov    $0x1,%edi
  call   <sleep@plt>
  jmp    L80
L100:
  mov    $0x0,%eax
  call   <getpid@plt>
  mov    %eax,-0x18(%rbp)
  lea    -0x18(%rbp),%rcx
  mov    -0x10(%rbp),%eax
  mov    $0x4,%edx
  mov    %rcx,%rsi
  mov    %eax,%edi
  call   <writeData@plt>
  test   %eax,%eax
  jne    L67
  mov    -0x10(%rbp),%eax
  mov    %eax,%edi
  call   <close@plt>
  mov    $0xffffffff,%eax
  jmp    L142
L67:
  mov    -0x10(%rbp),%eax
  mov    %eax,%edi
  call   <close@plt>
  subl   $0x1,-0x14(%rbp)
L80:
  addl   $0x1,-0x14(%rbp)
L63:
  cmpl   $0x2,-0x14(%rbp)
  jle    L167
  mov    $0x0,%eax
L142:
  mov    -0x8(%rbp),%rdx
  sub    %fs:0x28,%rdx
  je     L9
  call   <__stack_chk_fail@plt>
L9:
  leave
  ret
```

assistant: ```c
int spcLockFile(const char *lfpath) {
  int attempt;
  int fd;
  int result;
  pid_t pid;
  for (attempt = 0; attempt < 3; attempt++) {
    if ((fd = open(lfpath, O_RDWR | O_CREAT | O_EXCL, S_IRWXU)) == -1) {
      if (errno != EEXIST)
        return -1;
      if ((fd = open(lfpath, O_RDONLY)) == -1)
        return -1;
      result = readData(fd, &pid, sizeof(pid));
      close(fd);
      if (result) {
        if (pid == getpid())
          return 1;
        if (kill(pid, 0) == -1) {
          if (errno != ESRCH)
            return -1;
          attempt--;
          unlink(lfpath);
          continue;
        }
      }
      sleep(1);
      continue;
    }
    pid = getpid();
    if (!writeData(fd, &pid, sizeof(pid))) {
      close(fd);
      return -1;
    }
    close(fd);
    attempt--;
  }
  return 0;
}
```