pollution: itimerval
struct itimerval { struct timeval it_interval; struct timeval it_value; }; 

pollution: itimerval
pollution: getitimer
int getitimer(int, struct itimerval *); 

pollution: gettimeofday
int gettimeofday(struct timeval * restrict, void * restrict); 

pollution: itimerval
pollution: itimerval
pollution: setitimer
int setitimer(int, const struct itimerval * restrict, struct itimerval * restrict); 

pollution: ITIMER_PROF
#define ITIMER_PROF 2

pollution: ITIMER_REAL
#define ITIMER_REAL 0

pollution: ITIMER_VIRTUAL
#define ITIMER_VIRTUAL 1