#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>

int main()
{
    int fd;
    size_t size;
    char name[]="aaa.fifo";

    umask(0);
    
    if(mknod(name, S_IFIFO | 0666, 0) < 0)
    {
        if (unlink(name)==-1)
	{
		printf("Can\'t create FIFO\n");
		exit(-1);
	}
	mknod(name, S_IFIFO | 0666, 0);
    }
    
    if ((fd = open(name, O_WRONLY)) < 0)
    {
	printf("Can\'t open FIFO for writing\n");
	exit(-1);
    }
    
    size = write(fd, "Hello, world!", 14);
    
    if (size != 14)
    {
	printf("Can\'t write all string to FIFO\n");
	exit(-1);
    }
    close(fd);
    return 0;
}

#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>

int main()
{
	int fd;
	size_t size;
	char resstring[14];
	char name[]="aaa.fifo";
	
	if ((fd = open(name, O_RDONLY)) < 0)
	{
		printf("Can\'t open FIFO for reading\n");
		exit(-1);
	}
   
        size = read(fd, resstring, 14);
	if(size < 0)
	{
		printf("Can\'t read string\n");
		exit(-1);
	}
	printf("%s\n",resstring);
        close(fd);
	return 0;
}