命名管道-----消费者

#include <stdio.h>

#include <unistd.h>

#include <stdlib.h>

#include <string.h>

#include <fcntl.h>

#include <limits.h>

#include <sys/types.h>

#include <sys/stat.h>



#define FIFO_NAME "/tmp/my_fifo"

#define BUFFER_SIZE PIPE_BUF



int main() {

	int pipe_fd;

	int res;

	int open_mode = O_RDONLY;

	char buffer[BUFFER_SIZE + 1];

	int bytes_read = 0;



	memset(buffer, '\0', sizeof(buffer));



	printf("Process %d opening FIFO O_RDONLY\n", getpid());

	pipe_fd = open(FIFO_NAME, open_mode);

	printf("Process %d result %d\n", getpid(), pipe_fd);



	if(pipe_fd != -1) {

		do {

			res = read(pipe_fd, buffer, BUFFER_SIZE);

			bytes_read += res;

		} while(res > 0);

		(void)close(pipe_fd);

	} else {

		exit(EXIT_FAILURE);

	}

	printf("Process %d finished, %d bytes read\n", getpid(), bytes_read);

	exit(EXIT_SUCCESS);

}