Corpus for setpgid:

Coverage	Program
145	perf_event_open-setpgid
139	perf_event_open-setpgid
126	perf_event_open-getpgrp-setpgid
106	prctl$PR_SET_SYSCALL_USER_DISPATCH_ON-setpgid-setpgid
72	gettid-setpgid
51	gettid-setpgid
11	setpgid