#include <sys/sendfile.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>

int main() 
{
	int fd_in  = 0;
	int fd_out = 0;
	struct stat stat_buf;
	off_t  offset = 0;
	ssize_t count = 0;

	if ((fd_in=open("sendfile.c",O_RDONLY))<0)
	{
		perror("open");
		exit(1);
	}
	if ((fd_out=open("sendfile.out",O_CREAT|O_TRUNC|O_WRONLY,S_IRWXU))<0)
	{
		perror("open");
		exit(1);
	}

	if (fstat(fd_in,&stat_buf)) {
		perror("fstat");
	}


	count = sendfile(fd_out,fd_in,&offset,stat_buf.st_size);

	if (count < 0)
		perror("sendfile");
	
	if (close(fd_in) < 0)
		perror("close");
	if (close(fd_out) < 0)
		perror("close");
	return 0;
}