user: Converte this assembly snippet into its equivalent C code:

```asm
<main>:
  endbr64
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x18,%rsp
  mov    %fs:0x28,%rax
  mov    %rax,0x8(%rsp)
  xor    %eax,%eax
  call   <SYNC_INIT@plt>
  mov    $0x0,%eax
  call   <fork@plt>
  test   %rax,%rax
  js     L3
  mov    %rax,%rbp
  lea    D9(%rip),%r13
  lea    D79(%rip),%r12
  je     L63
L52:
  mov    $0x0,%edi
  call   <SYNC_WAIT@plt>
  mov    %r13,%rdi
  call   <puts@plt>
  mov    $0x0,%eax
  call   <read_increase_write@plt>
  mov    %eax,%ebx
  mov    $0x1,%esi
  mov    %rbp,%rdi
  call   <SYNC_TELL@plt>
  mov    %r12,%rdi
  call   <puts@plt>
  cmp    $0x9,%ebx
  jbe    L52
  movl   $0x0,0x4(%rsp)
  lea    0x4(%rsp),%rdi
  call   <wait@plt>
  mov    %rax,%rbx
  test   %rax,%rax
  js     L68
L79:
  mov    0x4(%rsp),%edi
  call   <WEXITSTATUS@plt>
  mov    %eax,%edx
  mov    %rbx,%rsi
  lea    D19(%rip),%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  mov    $0x1,%eax
L10:
  mov    0x8(%rsp),%rdx
  sub    %fs:0x28,%rdx
  jne    L12
  add    $0x18,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  ret
L3:
  lea    D12(%rip),%rdi
  call   <err_sys@plt>
  mov    $0xffffffff,%eax
  jmp    L10
L63:
  mov    $0x0,%eax
  call   <getpid@plt>
  mov    %eax,%esi
  lea    D60(%rip),%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  lea    D74(%rip),%rbp
  lea    D11(%rip),%r12
L40:
  mov    $0x0,%eax
  call   <read_increase_write@plt>
  mov    %eax,%ebx
  mov    $0x0,%eax
  call   <getppid@plt>
  movslq %eax,%rdi
  mov    $0x0,%esi
  call   <SYNC_TELL@plt>
  mov    %rbp,%rdi
  call   <puts@plt>
  cmp    $0x9,%ebx
  ja     L53
  mov    $0x1,%edi
  call   <SYNC_WAIT@plt>
  mov    $0x0,%eax
  call   <getppid@plt>
  mov    %eax,%esi
  mov    %r12,%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  jmp    L40
L68:
  lea    D52(%rip),%rdi
  call   <err_sys@plt>
  jmp    L79
L53:
  mov    $0x2,%eax
  jmp    L10
L12:
  call   <__stack_chk_fail@plt>
```

tool_calls: name: unpack_data
arguments: tag: D9
type_guessed: string
name: unpack_data
arguments: tag: D79
type_guessed: string
name: unpack_data
arguments: tag: D19
type_guessed: string
name: unpack_data
arguments: tag: D12
type_guessed: string
name: unpack_data
arguments: tag: D60
type_guessed: string
name: unpack_data
arguments: tag: D74
type_guessed: string
name: unpack_data
arguments: tag: D11
type_guessed: string
name: unpack_data
arguments: tag: D52
type_guessed: string

tool: D9: wait child

tool: D79: notify child

tool: D19: wait child %u exit %d


tool: D12: fork error

tool: D60: child %u running


tool: D74: notify parent

tool: D11: wait parent %u


tool: D52: wait error

assistant: ```c
int main(void) {
  int ret = 0;
  pid_t cid = 0;
  SYNC_INIT();
  cid = fork();
  if (cid < 0) {
    err_sys("fork error");
    return -1;
  } else if (cid == 0) {
    printf("child %u running\n", getpid());
    while (ret < 10) {
      ret = read_increase_write();
      SYNC_TELL(getppid(), 0);
      printf("notify parent\n");
      if (ret < 0 || ret >= 10)
        break;
      SYNC_WAIT(1);
      printf("wait parent %u\n", getppid());
    }
    return 2;
  }
  while (ret < 10 && ret >= 0) {
    SYNC_WAIT(0);
    printf("wait child\n");
    ret = read_increase_write();
    SYNC_TELL(cid, 1);
    printf("notify child\n");
  }
  pid_t wid = 0;
  int status = 0;
  if ((wid = wait(&status)) < 0)
    err_sys("wait error");
  printf("wait child %u exit %d\n", wid, WEXITSTATUS(status));
  return 1;
}
```