Unix / C：打开新终端并将输出重定向到它

> xterm不能正常关闭(程序终止时会关闭).我不知道为什么会这样.
>在预期输出之前,输出一个数字.再说一次,我不知道为什么.
>我似乎无法重定向输入.

也许其他人知道如何修复这些错误(以及我可能没有注意到的任何其他错误).

#include <stdlib.h>
#include <fcntl.h>
#include <string.h>
#include <unistd.h>
#include <iostream>
#include <sstream>

int main()
{
  int pt = posix_openpt(O_RDWR);
  if (pt == -1)
  {
    std::cerr << "Could not open pseudo terminal.n";
    return EXIT_FAILURE;
  }
  char* ptname = ptsname(pt);
  if (!ptname)
  {
    std::cerr << "Could not get pseudo terminal device name.n";
    close(pt);
    return EXIT_FAILURE;
  }

  if (unlockpt(pt) == -1)
  {
    std::cerr << "Could not get pseudo terminal device name.n";
    close(pt);
    return EXIT_FAILURE;
  }

  std::ostringstream oss;
  oss << "xterm -S" << (strrchr(ptname,'/')+1) << "/" << pt << " &";
  system(oss.str().c_str());

  int xterm_fd = open(ptname,O_RDWR);
  char c;
  do read(xterm_fd,&c,1); while (c!='n');

  if (dup2(pt,1) <0)
  {
    std::cerr << "Could not redirect standard output.n";
    close(pt);
    return EXIT_FAILURE;
  }
  if (dup2(pt,2) <0)
  {
    std::cerr << "Could not redirect standard error output.n";
    close(pt);
    return EXIT_FAILURE;
  }

  std::cout << "This should appear on the xterm." << std::endl;
  std::cerr << "So should this.n";
  std::cin.ignore(1);

  close(pt);
  return EXIT_SUCCESS;
}