Corpus for waitid$P_PIDFD:
Coverage Program
1166 gettid-fcntl$getownex-rt_tgsigqueueinfo-fcntl$getownex-fork-getpgrp-gettid-openat$ptmx-openat$full-sendfile-waitid$P_PIDFD-tgkill-gettid-ioctl$AUTOFS_DEV_IOCTL_VERSION-sendfile-getpgrp-gettid-tgkill-fork-setpgid
90 getpid-pidfd_open-waitid$P_PIDFD
52 perf_event_open-waitid$P_PIDFD
24 waitid-waitid$P_PIDFD