user: 请从给定的汇编指令推导出C源代码:

```asm
<main>:
  endbr64
  sub    $0x28,%rsp
  mov    %fs:0x28,%rax
  mov    %rax,0x18(%rsp)
  xor    %eax,%eax
  mov    %rsp,%rdi
  call   <pipe@plt>
  mov    $0x0,%eax
  call   <fork@plt>
  test   %rax,%rax
  je     L34
  mov    (%rsp),%edi
  call   <close@plt>
  mov    $0x1,%esi
  mov    0x4(%rsp),%edi
  call   <dup2@plt>
  mov    $0x0,%r9d
  lea    D57(%rip),%r8
  lea    D28(%rip),%rcx
  lea    D84(%rip),%rdx
  lea    D94(%rip),%rdi
  mov    %rdi,%rsi
  mov    $0x0,%eax
  call   <execlp@plt>
L17:
  mov    0x18(%rsp),%rax
  sub    %fs:0x28,%rax
  jne    L9
  mov    $0x0,%eax
  add    $0x28,%rsp
  ret
L34:
  mov    0x4(%rsp),%edi
  call   <close@plt>
  mov    $0x0,%esi
  mov    (%rsp),%edi
  call   <dup2@plt>
  lea    0x8(%rsp),%rdi
  call   <pipe@plt>
  mov    $0x0,%eax
  call   <fork@plt>
  test   %rax,%rax
  je     L58
  mov    0x8(%rsp),%edi
  call   <close@plt>
  mov    $0x1,%esi
  mov    0xc(%rsp),%edi
  call   <dup2@plt>
  mov    $0x0,%r8d
  lea    D5(%rip),%rcx
  lea    D48(%rip),%rdx
  lea    D26(%rip),%rdi
  mov    %rdi,%rsi
  mov    $0x0,%eax
  call   <execlp@plt>
  jmp    L17
L58:
  mov    0xc(%rsp),%edi
  call   <close@plt>
  mov    $0x0,%esi
  mov    0x8(%rsp),%edi
  call   <dup2@plt>
  lea    0x10(%rsp),%rdi
  call   <pipe@plt>
  mov    $0x0,%eax
  call   <fork@plt>
  test   %rax,%rax
  je     L64
  mov    0x10(%rsp),%edi
  call   <close@plt>
  mov    $0x1,%esi
  mov    0x14(%rsp),%edi
  call   <dup2@plt>
  mov    $0x0,%edx
  lea    D35(%rip),%rdi
  mov    %rdi,%rsi
  mov    $0x0,%eax
  call   <execlp@plt>
  jmp    L17
L64:
  mov    0x14(%rsp),%edi
  call   <close@plt>
  mov    $0x0,%esi
  mov    0x10(%rsp),%edi
  call   <dup2@plt>
  mov    $0x0,%ecx
  lea    D7(%rip),%rdx
  lea    D49(%rip),%rdi
  mov    %rdi,%rsi
  mov    $0x0,%eax
  call   <execlp@plt>
  jmp    L17
L9:
  call   <__stack_chk_fail@plt>
```

tool_calls: name: disassemble_data
arguments: label: D57
data_type: string
name: disassemble_data
arguments: label: D28
data_type: string
name: disassemble_data
arguments: label: D84
data_type: string
name: disassemble_data
arguments: label: D94
data_type: string
name: disassemble_data
arguments: label: D5
data_type: string
name: disassemble_data
arguments: label: D48
data_type: string
name: disassemble_data
arguments: label: D26
data_type: string
name: disassemble_data
arguments: label: D35
data_type: string
name: disassemble_data
arguments: label: D7
data_type: string
name: disassemble_data
arguments: label: D49
data_type: string

tool: D57: /etc/passwd

tool: D28: ^#

tool: D84: -v

tool: D94: grep

tool: D5: -d:

tool: D48: -f7

tool: D26: cut

tool: D35: uniq

tool: D7: -l

tool: D49: wc

assistant: ```c
int main() {
  int fd[2];
  pipe(fd);
  if (fork() != 0) {
    close(fd[0]);
    dup2(fd[1], 1);
    execlp("grep", "grep", "-v", "^#", "/etc/passwd", NULL);
  } else {
    close(fd[1]);
    dup2(fd[0], 0);
    int fd2[2];
    pipe(fd2);
    if (fork() != 0) {
      close(fd2[0]);
      dup2(fd2[1], 1);
      execlp("cut", "cut", "-f7", "-d:", NULL);
    } else {
      close(fd2[1]);
      dup2(fd2[0], 0);
      int fd3[2];
      pipe(fd3);
      if (fork() != 0) {
        close(fd3[0]);
        dup2(fd3[1], 1);
        execlp("uniq", "uniq", NULL);
      } else {
        close(fd3[1]);
        dup2(fd3[0], 0);
        execlp("wc", "wc", "-l", NULL);
      }
    }
  }
}
```