Corpus for setpgid:

Coverage	Program
144	perf_event_open-perf_event_open-socket$inet6_udp-setpgid
144	perf_event_open-setpgid
137	sched_setaffinity-perf_event_open-setpgid
109	setpgid
107	prctl$PR_SET_SYSCALL_USER_DISPATCH_ON-setpgid
67	gettid-process_vm_readv-setpgid
58	perf_event_open-sched_setaffinity-setpgid
40	gettid-setpgid