pollution: sigaltstack
typedef struct sigaltstack stack_t; 

pollution: sigaltstack
struct sigaltstack { void *ss_sp; int ss_flags; size_t ss_size; }; 

pollution: asctime_r
char *asctime_r (const struct tm *restrict, char *restrict); 

pollution: ctime_r
char *ctime_r (const time_t *, char *); 

pollution: CLOCKS_PER_SEC
#define CLOCKS_PER_SEC 1000000L