pipe_dup.c

Linux大学上机源码学习

#include "unistd.h"
#include "stdio.h"
#include "string.h"
main()
{ int fd[2],pid;
  char buffer;
  pipe(fd);
  pid=fork();
  if(pid==0)
  {
   close(fd[1]);
   dup2(fd[0],0);
   close(fd[0]);
   execl("/bin/cat","cat","-n",NULL);
  }
 else
  {close(fd[0]);
   printf("you can input any data below:\n");
   dup2(fd[1],1);
   close(fd[1]);
   while((buffer=getchar())!='#')
     putchar(buffer);
}
}