Linux侦听键盘，将data保存到文件data.out

nane

使用命名管道，可是没有成功，源代码如下：


#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(ch!='~')
    {
      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;
}