//pipe.c

#include <stdio.h>

#include <unistd.h>

int main(int argc, char **argv)

{

int fd[2];

pid_t pid;

char buf[20]={0};

int len = 0;

if(pipe(fd) < 0)

printf("Create Pipe Error!\n");

if((pid = fork()) < 0) {

printf("Fork Error!\n");

} else if(pid > 0) {

close(fd[0]);

write(fd[1],"hello world\n", 12);

} else {

close(fd[1]);

read(fd[0], buf, 20);

printf("%s\n", buf);

}

//pause();

return 0;

}