readahead.c\linux\src - musl - musl - an implementation of the standard library for Linux-based systems

#define _GNU_SOURCE
#include <fcntl.h>
#include "syscall.h"
ssize_t readahead(int fd, off_t pos, size_t len)
{
	return syscall(SYS_readahead, fd, __SYSCALL_LL_O(pos), len);
}