user: 这段汇编代码用C语言表示是什么样的？

```asm
<main>:
  endbr64
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x8,%rsp
  cmp    $0x1,%edi
  jle    L19
  xor    %eax,%eax
  mov    %rsi,%rbx
  call   <setsid@plt>
  cmp    $0xffffffff,%eax
  je     L151
L113:
  xor    %eax,%eax
  call   <getpid@plt>
  mov    %eax,%r12d
  xor    %eax,%eax
  call   <getpgrp@plt>
  xor    %edi,%edi
  mov    %eax,%r13d
  call   <getsid@plt>
  mov    %r13d,%ecx
  mov    %r12d,%edx
  lea    D18(%rip),%rdi
  mov    %eax,%esi
  xor    %eax,%eax
  call   <printf@plt>
  call   <fork@plt>
  test   %eax,%eax
  js     L21
  je     L160
  xor    %edi,%edi
  call   <exit@plt>
L111:
  call   <fork@plt>
  mov    %eax,%ebp
  test   %eax,%eax
  js     L115
  je     L6
L144:
  mov    %ebp,%esi
  mov    %ebp,%edi
  call   <setpgid@plt>
  cmp    $0xffffffff,%eax
  je     L36
L168:
  xor    %edi,%edi
  mov    %ebp,%esi
  call   <setpgid@plt>
  cmp    $0xffffffff,%eax
  je     L53
L106:
  xor    %eax,%eax
  call   <print@plt>
  xor    %eax,%eax
L141:
  add    $0x8,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  ret
L160:
  xor    %eax,%eax
  call   <setsid@plt>
  add    $0x1,%eax
  je     L51
L87:
  xor    %eax,%eax
  call   <getpid@plt>
  mov    %eax,%r12d
  xor    %eax,%eax
  call   <getpgrp@plt>
  xor    %edi,%edi
  mov    %eax,%r13d
  call   <getsid@plt>
  mov    %r13d,%ecx
  mov    %r12d,%edx
  lea    D25(%rip),%rdi
  mov    %eax,%esi
  xor    %eax,%eax
  call   <printf@plt>
  jmp    L111
L21:
  lea    D89(%rip),%rdi
  call   <err_sys@plt>
  jmp    L111
L115:
  lea    D89(%rip),%rdi
  call   <err_sys@plt>
  jmp    L144
L6:
  xor    %eax,%eax
  call   <getpid@plt>
  mov    %eax,%r12d
  xor    %eax,%eax
  call   <getpgrp@plt>
  xor    %edi,%edi
  mov    %eax,%r13d
  call   <getsid@plt>
  mov    %r13d,%ecx
  mov    %r12d,%edx
  lea    D97(%rip),%rdi
  mov    %eax,%esi
  xor    %eax,%eax
  call   <printf@plt>
  xor    %esi,%esi
  xor    %edi,%edi
  call   <setpgid@plt>
  add    $0x1,%eax
  je     L48
L188:
  mov    0x8(%rbx),%rdi
  xor    %edx,%edx
  mov    %rdi,%rsi
  call   <execlp@plt>
  or     $0xffffffff,%edi
  call   <exit@plt>
  jmp    L144
L151:
  lea    D34(%rip),%rdi
  call   <perror@plt>
  jmp    L113
L53:
  lea    D62(%rip),%rdi
  call   <err_sys@plt>
  jmp    L106
L36:
  lea    D51(%rip),%rdi
  call   <err_sys@plt>
  jmp    L168
L51:
  lea    D34(%rip),%rdi
  call   <err_sys@plt>
  jmp    L87
L48:
  lea    D60(%rip),%rdi
  call   <err_sys@plt>
  jmp    L188
L19:
  lea    D36(%rip),%rdi
  call   <puts@plt>
  or     $0xffffffff,%eax
  jmp    L141
```

tool_calls: name: unpack_data
arguments: label: D18
datatype: string
name: unpack_data
arguments: label: D25
datatype: string
name: unpack_data
arguments: label: D89
datatype: string
name: unpack_data
arguments: label: D97
datatype: string
name: unpack_data
arguments: label: D34
datatype: string
name: unpack_data
arguments: label: D62
datatype: string
name: unpack_data
arguments: label: D51
datatype: string
name: unpack_data
arguments: label: D60
datatype: string
name: unpack_data
arguments: label: D36
datatype: string

tool: D18: parent %u: %u, %u


tool: D25: session %u: %u, %u


tool: D89: fork

tool: D97: child %u: %u, %u


tool: D34: setsid

tool: D62: setpgid 2

tool: D51: setpgid 1

tool: D60: setpgid child

tool: D36: Usage: session grpid

assistant: ```c
int main(int argc, char *argv[]) {
  if (argc < 2) {
    printf("Usage: session grpid\n");
    return -1;
  }
  if (setsid() == -1)
    perror("setsid");
  int ret = 0;
  pid_t pid = getpid();
  pid_t grp = getpgrp();
  pid_t sid = getsid(0);
  printf("parent %u: %u, %u\n", sid, pid, grp);
  pid_t cid = fork();
  if (cid < 0)
    err_sys("fork");
  else if (cid == 0) {
    if (setsid() == -1)
      err_sys("setsid");
    pid = getpid();
    grp = getpgrp();
    sid = getsid(0);
    printf("session %u: %u, %u\n", sid, pid, grp);
  } else
    exit(0);
  cid = fork();
  if (cid < 0)
    err_sys("fork");
  else if (cid == 0) {
    pid_t pid = getpid();
    pid_t grp = getpgrp();
    pid_t sid = getsid(0);
    printf("child %u: %u, %u\n", sid, pid, grp);
    ret = setpgid(0, 0);
    if (ret == -1)
      err_sys("setpgid child");
    execlp(argv[1], argv[1], NULL);
    exit(-1);
  }
  ret = setpgid(cid, cid);
  if (ret == -1)
    err_sys("setpgid 1");
  ret = setpgid(0, cid);
  if (ret == -1)
    err_sys("setpgid 2");
  print();
  return 0;
}
```