@kirby Dumping a file to stdout takes 5 lines;
#include <stdio.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <unistd.h>
#include <sys/sendfile.h>

int main()
{
/* open file */
int fp = open("main.c", O_RDONLY);

/* get file stats */
struct stat s;
fstat(fp, &s);

/* write file directly to stdout, with length from stat */
sendfile(fileno(stdout), fp, NULL, s.st_size);

close(fp);

}