user: 请将以下的汇编代码转换成C语言代码：

```asm
<listen>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  push   %rbx
  sub    $0x458,%rsp
  mov    %edi,-0x454(%rbp)
  mov    %rsi,-0x460(%rbp)
  mov    %fs:0x28,%rax
  mov    %rax,-0x18(%rbp)
  xor    %eax,%eax
  mov    -0x454(%rbp),%eax
  add    $0x1,%eax
  mov    %eax,-0x434(%rbp)
  movl   $0x0,-0x438(%rbp)
  movl   $0x0,-0x440(%rbp)
  movl   $0x0,-0x43c(%rbp)
  lea    -0x444(%rbp),%rax
  mov    %rax,%rdi
  call   <FD_ZERO@plt>
  movl   $0x2,-0x428(%rbp)
  movl   $0x88b80,-0x424(%rbp)
  jmp    L225
L254:
  lea    -0x444(%rbp),%rdx
  mov    -0x454(%rbp),%eax
  mov    %rdx,%rsi
  mov    %eax,%edi
  call   <FD_SET@plt>
  lea    -0x428(%rbp),%rdx
  lea    -0x444(%rbp),%rsi
  mov    -0x434(%rbp),%eax
  mov    %rdx,%r8
  mov    $0x0,%ecx
  mov    $0x0,%edx
  mov    %eax,%edi
  call   <select@plt>
  mov    %eax,-0x430(%rbp)
  lea    -0x444(%rbp),%rdx
  mov    -0x454(%rbp),%eax
  mov    %rdx,%rsi
  mov    %eax,%edi
  call   <FD_ISSET@plt>
  test   %rax,%rax
  je     L117
  lea    -0x420(%rbp),%rcx
  mov    -0x454(%rbp),%eax
  mov    $0x400,%edx
  mov    %rcx,%rsi
  mov    %eax,%edi
  call   <read@plt>
  mov    %eax,-0x42c(%rbp)
  cmpl   $0x0,-0x42c(%rbp)
  jle    L117
  movzbl -0x420(%rbp),%eax
  cmp    $0x6,%al
  je     L47
  movzbl -0x420(%rbp),%eax
  cmp    $0x15,%al
  je     L47
  movzbl -0x420(%rbp),%eax
  cmp    $0x18,%al
  je     L47
  movzbl -0x420(%rbp),%eax
  cmp    $0xa5,%al
  jne    L117
L47:
  movl   $0x1,-0x440(%rbp)
  mov    -0x42c(%rbp),%edx
  lea    -0x420(%rbp),%rcx
  mov    -0x460(%rbp),%rax
  mov    %rcx,%rsi
  mov    %rax,%rdi
  call   <memcpy@plt>
  mov    -0x42c(%rbp),%eax
  add    %eax,-0x438(%rbp)
L117:
  cmpl   $0x0,-0x430(%rbp)
  jne    L225
  movl   $0x1,-0x440(%rbp)
  movl   $0x1,-0x43c(%rbp)
L225:
  cmpl   $0x0,-0x440(%rbp)
  je     L254
  cmpl   $0x1,-0x43c(%rbp)
  jne    L64
  mov    $0xffffffff,%eax
  jmp    L180
L64:
  mov    -0x460(%rbp),%rax
  movzbl (%rax),%eax
  cmp    $0x6,%al
  je     L73
  mov    -0x460(%rbp),%rax
  movzbl (%rax),%eax
  cmp    $0x15,%al
  je     L73
  mov    -0x460(%rbp),%rax
  movzbl (%rax),%eax
  cmp    $0x18,%al
  jne    L229
L73:
  mov    $0x1,%eax
  jmp    L180
L229:
  movl   $0x0,-0x440(%rbp)
  cmpl   $0x5,-0x438(%rbp)
  jle    L92
  mov    -0x438(%rbp),%eax
  lea    -0x6(%rax),%ebx
  mov    -0x460(%rbp),%rax
  add    $0x2,%rax
  mov    %rax,%rdi
  call   <getint@plt>
  cmp    %eax,%ebx
  jne    L92
  movl   $0x1,-0x440(%rbp)
L92:
  movl   $0x0,-0x43c(%rbp)
  lea    -0x444(%rbp),%rax
  mov    %rax,%rdi
  call   <FD_ZERO@plt>
  movl   $0x2,-0x428(%rbp)
  movl   $0x88b80,-0x424(%rbp)
  jmp    L31
L181:
  lea    -0x444(%rbp),%rdx
  mov    -0x454(%rbp),%eax
  mov    %rdx,%rsi
  mov    %eax,%edi
  call   <FD_SET@plt>
  lea    -0x428(%rbp),%rdx
  lea    -0x444(%rbp),%rsi
  mov    -0x434(%rbp),%eax
  mov    %rdx,%r8
  mov    $0x0,%ecx
  mov    $0x0,%edx
  mov    %eax,%edi
  call   <select@plt>
  mov    %eax,-0x430(%rbp)
  lea    -0x444(%rbp),%rdx
  mov    -0x454(%rbp),%eax
  mov    %rdx,%rsi
  mov    %eax,%edi
  call   <FD_ISSET@plt>
  test   %rax,%rax
  je     L122
  lea    -0x420(%rbp),%rcx
  mov    -0x454(%rbp),%eax
  mov    $0x400,%edx
  mov    %rcx,%rsi
  mov    %eax,%edi
  call   <read@plt>
  mov    %eax,-0x42c(%rbp)
  cmpl   $0x0,-0x42c(%rbp)
  jle    L122
  mov    -0x438(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x460(%rbp),%rax
  lea    (%rdx,%rax,1),%rcx
  mov    -0x42c(%rbp),%edx
  lea    -0x420(%rbp),%rax
  mov    %rax,%rsi
  mov    %rcx,%rdi
  call   <memcpy@plt>
  mov    -0x42c(%rbp),%eax
  add    %eax,-0x438(%rbp)
L122:
  cmpl   $0x0,-0x430(%rbp)
  jne    L59
  movl   $0x1,-0x440(%rbp)
  movl   $0x1,-0x43c(%rbp)
L59:
  cmpl   $0x5,-0x438(%rbp)
  jle    L31
  mov    -0x438(%rbp),%eax
  lea    -0x6(%rax),%ebx
  mov    -0x460(%rbp),%rax
  add    $0x2,%rax
  mov    %rax,%rdi
  call   <getint@plt>
  cmp    %eax,%ebx
  jne    L31
  movl   $0x1,-0x440(%rbp)
L31:
  cmpl   $0x0,-0x440(%rbp)
  je     L181
  mov    -0x438(%rbp),%edx
  mov    -0x460(%rbp),%rax
  mov    %edx,%esi
  mov    %rax,%rdi
  call   <checksum@plt>
  cmp    $0x1,%eax
  jne    L97
  mov    -0x438(%rbp),%eax
  jmp    L180
L97:
  mov    $0xfffffffe,%eax
L180:
  mov    -0x18(%rbp),%rdx
  sub    %fs:0x28,%rdx
  je     L20
  call   <__stack_chk_fail@plt>
L20:
  mov    -0x8(%rbp),%rbx
  leave
  ret
```

assistant: ```c
int listen(int fd, unsigned char *pak) {
  unsigned char buf[1024];
  fd_set readfs;
  struct timeval tout;
  int ret, res, STOP, TIMEOUT;
  int maxfd = fd + 1;
  int len = 0;
  STOP = 0;
  TIMEOUT = 0;
  FD_ZERO(&readfs);
  tout.tv_sec = 2;
  tout.tv_usec = 560000;
  while (STOP == 0) {
    FD_SET(fd, &readfs);
    ret = select(maxfd, &readfs, NULL, NULL, &tout);
    if (FD_ISSET(fd, &readfs)) {
      res = read(fd, buf, 1024);
      if (res > 0) {
        if (buf[0] == 0x06 || buf[0] == 0x15 || buf[0] == 0x18 || buf[0] == 0xa5) {
          STOP = 1;
          memcpy(pak, buf, res);
          len += res;
        }
      }
    }
    if (ret == 0) {
      STOP = 1;
      TIMEOUT = 1;
    }
  }
  if (TIMEOUT == 1)
    return -1;
  if (pak[0] == 0x06 || pak[0] == 0x15 || pak[0] == 0x18)
    return 1;
  STOP = 0;
  if (len >= 6 && (len - 6) == getint(&pak[2]))
    STOP = 1;
  TIMEOUT = 0;
  FD_ZERO(&readfs);
  tout.tv_sec = 2;
  tout.tv_usec = 560000;
  while (STOP == 0) {
    FD_SET(fd, &readfs);
    ret = select(maxfd, &readfs, NULL, NULL, &tout);
    if (FD_ISSET(fd, &readfs)) {
      res = read(fd, buf, 1024);
      if (res > 0) {
        memcpy(&pak[len], buf, res);
        len += res;
      }
    }
    if (ret == 0) {
      STOP = 1;
      TIMEOUT = 1;
    }
    if (len >= 6 && (len - 6) == getint(&pak[2]))
      STOP = 1;
  }
  if (checksum(pak, len) == 1)
    return len;
  else
    return -2;
}
```