/*** This happens because as you can read in the _syscall manpage :**** NOTES** Starting around kernel 2.6.18, the _syscall macros were removed from header** files supplied to user space. Use syscall(2) instead. (Some architectures,** notably ia64, never provided the _syscall macros; on those architectures,** syscall(2) was always required.)**** so you got this compilation error :** a.c:7: error: expected declaration specifiers or ‘...’ before ‘epoll_create’** a.c:7: error: expected declaration specifiers or ‘...’ before ‘size’** a.c:7: warning: data definition has no type or storage class**** It means after epoll_create and size are not valids type's specifier.** This is because _syscall1 is not defined and thus it take it for a ** prototype, so epoll_create would be some data type.**** The solution is to include the little _syscall.h that define it.** man epoll_create do it for me, anyway.*/#include <linux/unistd.h>#include <errno.h>#include "_syscall.h"#define __NR_epoll_create 254_syscall1(int, epoll_create, int, size)