命名管道--生产者

#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

#define TEN_MEG		(1024 * 1024 * 10)



int main(int argc, char *argv[]) {

	int pipe_fd;

	int res;

	int open_mode = O_WRONLY;

	int bytes_sent = 0;

	char buffer[BUFFER_SIZE + 1];

	

	if(access(FIFO_NAME, F_OK) == -1) {

		res = mkfifo(FIFO_NAME, 0777);

		if(res != 0) {

			fprintf(stderr, "Could not create fifo %s\n", FIFO_NAME);

			exit(EXIT_FAILURE);

		}

	}



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

	pipe_fd = open(FIFO_NAME, open_mode);

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

	

	if(pipe_fd != -1) {

		while(bytes_sent <	TEN_MEG) {

			res = write(pipe_fd, buffer, BUFFER_SIZE);

			if(res == -1) {

				fprintf(stderr, "Write error on pipe\n");

				exit(EXIT_FAILURE);

			}

			bytes_sent += res;

		}

		(void)close(pipe_fd);

	} else {

		exit(EXIT_FAILURE);

	}

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

	exit(EXIT_SUCCESS);

}