long gethostid(void);
int nice(int);
void sync(void);
+int getdtablesize(void);
#endif
#ifdef _GNU_SOURCE
int usleep(unsigned);
unsigned ualarm(unsigned, unsigned);
int setgroups(int, const gid_t []);
+int setresuid(uid_t, uid_t, uid_t);
+int setresgid(gid_t, gid_t, gid_t);
#endif
#define _XOPEN_VERSION 700