passwd* getpwnam(char*);
passwd* getpwuid(uid_t);
int getpwuid_r(uid_t, passwd*, char*, size_t, passwd**);
int kill(pid_t, int);
int sem_close(sem_t*);
int sigemptyset(sigset_t*);
int sigfillset(sigset_t*);
int sigismember(sigset_t*, int);
int sigsuspend(sigset_t*);