// Source --> https://www.geeksforgeeks.org/named-pipe-fifo-example-c-program/

// C program to implement one side of FIFO ... 
// this side writes first, then reads 

#include <stdio.h> 
#include <string.h> 
#include <fcntl.h> 
#include <sys/stat.h> 
#include <sys/types.h> 
#include <unistd.h> 
  
int main() { 
    int fd; 
  
    // FIFO file path 
    char * myfifo = "/tmp/myfifo"; 
    // Creating the named file(FIFO) 
    // mkfifo(<pathname>, <permission>) 
    mkfifo(myfifo, 0666); 
    char arr1[80], arr2[80]; 
    while (1) { 
        // Open FIFO for write only 
        fd = open(myfifo, O_WRONLY); 
        // Take an input arr2ing from user. 
        // 80 is maximum length 
        fgets(arr2, 80, stdin); 
        // Write the input arr2ing on FIFO and close it 
        write(fd, arr2, strlen(arr2)+1); 
        close(fd); 
        // Open FIFO for Read only 
        fd = open(myfifo, O_RDONLY); 
        // Read from FIFO 
        read(fd, arr1, sizeof(arr1)); 
        // Print the read message 
        printf("User2: %s\n", arr1); 
        close(fd); } 
    return 0; }