user: What would the C source look like for the assembly code provided here?

```asm
<cras_send_with_fd>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbx
  sub    $0x88,%rsp
  mov    %edi,-0x94(%rbp)
  mov    %rsi,-0xa0(%rbp)
  mov    %rdx,-0xa8(%rbp)
  mov    %ecx,-0x98(%rbp)
  mov    %fs:0x28,%rax
  mov    %rax,-0x38(%rbp)
  xor    %eax,%eax
  mov    %rsp,%rax
  mov    %rax,%rbx
  movq   $0x0,-0x60(%rbp)
  movq   $0x0,-0x58(%rbp)
  movq   $0x0,-0x50(%rbp)
  movq   $0x0,-0x48(%rbp)
  movq   $0x0,-0x40(%rbp)
  mov    $0x4,%edi
  call   <CMSG_SPACE@plt>
  mov    %eax,%ecx
  movslq %ecx,%rax
  sub    $0x1,%rax
  mov    %rax,-0x88(%rbp)
  movslq %ecx,%rax
  mov    %rax,%r14
  mov    $0x0,%r15d
  movslq %ecx,%rax
  mov    %rax,%r12
  mov    $0x0,%r13d
  movslq %ecx,%rax
  mov    $0x10,%edx
  sub    $0x1,%rdx
  add    %rdx,%rax
  mov    $0x10,%edi
  mov    $0x0,%edx
  div    %rdi
  imul   $0x10,%rax,%rax
  mov    %rax,%rsi
  and    $0xfffffffffffff000,%rsi
  mov    %rsp,%rdx
  sub    %rsi,%rdx
L24:
  cmp    %rdx,%rsp
  je     L16
  sub    $0x1000,%rsp
  orq    $0x0,0xff8(%rsp)
  jmp    L24
L16:
  mov    %rax,%rdx
  and    $0xfff,%edx
  sub    %rdx,%rsp
  mov    %rax,%rdx
  and    $0xfff,%edx
  test   %rdx,%rdx
  je     L8
  and    $0xfff,%eax
  sub    $0x8,%rax
  add    %rsp,%rax
  orq    $0x0,(%rax)
L8:
  mov    %rsp,%rax
  add    $0x0,%rax
  mov    %rax,-0x80(%rbp)
  lea    -0x70(%rbp),%rax
  mov    %rax,-0x48(%rbp)
  movl   $0x1,-0x60(%rbp)
  mov    -0xa0(%rbp),%rax
  mov    %rax,-0x68(%rbp)
  mov    -0xa8(%rbp),%rax
  mov    %rax,-0x70(%rbp)
  mov    -0x80(%rbp),%rax
  mov    %rax,-0x58(%rbp)
  mov    %ecx,-0x50(%rbp)
  lea    -0x60(%rbp),%rax
  mov    %rax,%rdi
  call   <CMSG_FIRSTHDR@plt>
  mov    %rax,-0x78(%rbp)
  mov    D4(%rip),%rax
  mov    (%rax),%edx
  mov    -0x78(%rbp),%rax
  mov    %edx,0x8(%rax)
  mov    D16(%rip),%rax
  mov    (%rax),%edx
  mov    -0x78(%rbp),%rax
  mov    %edx,0x4(%rax)
  mov    $0x4,%edi
  call   <CMSG_LEN@plt>
  mov    -0x78(%rbp),%rdx
  mov    %eax,(%rdx)
  mov    -0x78(%rbp),%rax
  mov    %rax,%rdi
  call   <CMSG_DATA@plt>
  mov    %eax,%ecx
  lea    -0x98(%rbp),%rax
  mov    $0x4,%edx
  mov    %rax,%rsi
  mov    %ecx,%edi
  call   <memcpy@plt>
  mov    -0x78(%rbp),%rax
  mov    (%rax),%eax
  mov    %eax,-0x50(%rbp)
  lea    -0x60(%rbp),%rcx
  mov    -0x94(%rbp),%eax
  mov    $0x0,%edx
  mov    %rcx,%rsi
  mov    %eax,%edi
  call   <sendmsg@plt>
  mov    %rbx,%rsp
  mov    -0x38(%rbp),%rdx
  sub    %fs:0x28,%rdx
  je     L18
  call   <__stack_chk_fail@plt>
L18:
  lea    -0x28(%rbp),%rsp
  pop    %rbx
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  pop    %rbp
  ret
```

assistant: ```c
int cras_send_with_fd(int sockfd, void *buf, size_t len, int fd) {
  struct msghdr msg = {0};
  struct iovec iov;
  struct cmsghdr *cmsg;
  char control[CMSG_SPACE(sizeof(int))];
  msg.msg_iov = &iov;
  msg.msg_iovlen = 1;
  iov.iov_base = buf;
  iov.iov_len = len;
  msg.msg_control = control;
  msg.msg_controllen = sizeof(control);
  cmsg = CMSG_FIRSTHDR(&msg);
  cmsg->cmsg_level = SOL_SOCKET;
  cmsg->cmsg_type = SCM_RIGHTS;
  cmsg->cmsg_len = CMSG_LEN(sizeof(int));
  memcpy(CMSG_DATA(cmsg), &fd, sizeof(fd));
  msg.msg_controllen = cmsg->cmsg_len;
  return sendmsg(sockfd, &msg, 0);
}
```