#include <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <signal.h>
#include <sys/stat.h>

#define FIFO "myfifo"
#define BIGDATASIZE (1024 * 1024 * 16)

int main()
{
	int fd;
	pid_t pid;
	int ret, errn;
	char *pbuf;

	assert(unlink(FIFO) == 0 || errno == ENOENT);
	assert(mkfifo(FIFO, 0664) == 0);

	pid = fork();
	if (pid == 0) {
		char buf[512];

		fd = open(FIFO, O_RDONLY);
		if (fd == -1) {
			printf("child: can not open %s\n", FIFO);
			return (1);
		}
		ret = read(fd, buf, sizeof(buf));
		printf("child: read %d bytes\n", ret);
		close(fd);
		return (0);
	}

	/* parent */
	signal(SIGPIPE, SIG_IGN);
	fd = open(FIFO, O_WRONLY);
	if (fd == -1) {
		printf("parent: can not open %s\n", FIFO);
		return (1);
	}
	
	pbuf = malloc(BIGDATASIZE);
	ret = write(fd, pbuf, BIGDATASIZE);	
	printf("parent: first write return=%d\n", ret);
	ret = write(fd, pbuf, BIGDATASIZE);	
	errn = errno;
	printf("parent: second write return=%d\n", ret);
	if (ret == -1)
		printf("parent: %s\n", strerror(errn));	
	return (0);
}