Linux侦听键盘，有名管道实现

有错误，没法写入文档，不知道为什么。代码如下：

#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <fcntl.h>
#include <termios.h>
#include <term.h>
#include <curses.h>

#define FIFO_NAME "/tmp/my_fifo"

static struct termios initial_settings,new_settings;
static int peek_character=-1;

void init_keyboard();
void close_keyboard();
int kbhit();
int readch();

int main(int argc, char* argv[])
{
  int pipe_fd;
  pid_t pid_listener, pid_writer;
  if(access (FIFO_NAME,F_OK)==-1)
    {
      mkfifo(FIFO_NAME,0766);
    }
  pid_listener = fork();
  if(pid_listener<0)
    {
      perror("fork");
      exit(1);
    }
  else if(pid_listener>0)/*the parent process*/
    {
      pid_writer = fork();
      if(pid_writer<0)
    {
      perror("fork");
     exit(1);
    }
      if(pid_writer == 0) /*the writer process*/
    {
     /*read data from pipe, then store the data to data.out*/
     int fout;
      fout = open("data.out",O_WRONLY|O_CREAT|O_APPEND);
     int ch;
      pipe_fd = open(FIFO_NAME,O_RDONLY);
     if(pipe_fd!=-1)
     {
     while(read(pipe_fd,&ch,1))
        {
            write(fout ,&ch,1);
        }
     }
      close(pipe_fd);
    }
    }
  else/*the listener process*/
    {
      /*detect the keyboard hit and send the characher to writer through pipe.*/
      init_keyboard();
      pipe_fd = open(FIFO_NAME,O_WRONLY);
      int ch = 0;
      while(
    {

     if(kbhit())
     {
          ch = readch();
          printf("you hit %c\n",ch);
          write(pipe_fd,&ch,1);
     }

    }
      close(pipe_fd);
      close_keyboard();
      exit(0);
    }
  wait(NULL);
  return 0;
}

void init_keyboard()
{
   tcgetattr(0,&initial_settings);
   new_settings=initial_settings;
   new_settings.c_lflag &= ~ICANON;
   new_settings.c_lflag &= ~ECHO;
   new_settings.c_lflag &= ~ISIG;
   new_settings.c_cc[VMIN] = 1;
   new_settings.c_cc[VTIME] = 0;
   tcsetattr(0,TCSANOW,&new_settings);
}

void close_keyboard()
{
  tcsetattr(0,TCSANOW,&initial_settings);
}

int kbhit()
{
  char ch;
  int nread;

  if(peek_character!=-1)
     return 1;
  new_settings.c_cc[VMIN]=0;
  tcsetattr(0,TCSANOW,&new_settings);
  nread=read(0,&ch,1);
  new_settings.c_cc[VMIN]=1;
  tcsetattr(0,TCSANOW,&new_settings);

  if(nread==1){
      peek_character=ch;
      return 1;
  }
  return 0;
}

int readch()
{
  char ch;
  if(peek_character!=-1)
    {
      ch=peek_character;
      peek_character=-1;
      return ch;
    }
  read(0,&ch,1);
  return ch;
}