pipe_example.c

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/wait.h>

#define BUFSIZE (10)
int main(int argc, char* argv[])
{
	int pipefds[2];
	pid_t pid;
	char buf[BUFSIZE];

	//create pipe
	if(pipe(pipefds) == -1){
		perror("pipe");
		exit(EXIT_FAILURE);
	}
	memset(buf,0,BUFSIZE);
	pid = fork();

	if (pid == 0) {
		//child close the write end
		close(pipefds[1]);
		//child read from the pipe read end until the pipe is empty
		while(read(pipefds[0], buf, 1)==1){
      buf[1] = '\0';
			printf("CHILD read from pipe -- %s\n", buf);
		}
		//after finishing reading, child close the read end
		close(pipefds[0]);
		printf("CHILD: EXITING!\n");
		exit(EXIT_SUCCESS);
	}else {
		printf("PARENT write in pipe\n");
		//parent close the read end
		close(pipefds[0]);
		//parent write in the pipe write end
		write(pipefds[1], "UICCS361", 8);
		//after finishing writing, parent close the write end
		close(pipefds[1]);
		//parent wait for child
		wait(NULL);
	}
	return 0;
}