Programming

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

int main( int argc, char **argv ){
        //char path[1024];
        //sprintf( path, "~/Desktop/doc/%s.nr", argv[1] );
        pid_t pid;
        char *file = argv[1];
        mkfifo( "named_pipe", 0777 );
        if( (pid = fork()) < 0 ){
                printf( "Fork error.\n" );
        }   
        else if( pid == 0 ){
                int fifo = open( "named_pipe", O_WRONLY );
                dup2( fifo, 1 ); // Attach stdout to the FIFO
                execlp( "cat", "cat", file );
                // Run cat and have it write to the FIFO
        }   
        else{
                wait( NULL ); // Wait for child to write to the FIFO
                int fifo = open( "named_pipe", O_RDONLY );
                dup2( fifo, 0 ); // Attach stdin to the FIFO
                execlp( "less", "less" );
                // Run less and have it read from the FIFO
        }   
        return 0;
}

int fifo = open( "named_pipe", O_RDONLY );
dup2( fifo, 0 ); // Attach stdin to the FIFO
wait( NULL ); // Wait for child to write to the FIFO
execlp( "less", "less" );
 // Run less and have it read from the FIFO