src/third_party/musl/src/linux/readahead.c

#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);
}