Corpus for getpgrp:

Coverage	Program
4505	syz_mount_image$vfat-openat-perf_event_open-mkdirat-getpgrp-socket$netlink-setsockopt$netlink_NETLINK_RX_RING-ioprio_get$pid-ioctl$sock_SIOCGPGRP
2130	perf_event_open-getpgrp-tgkill-fcntl$dupfd-socket$nl_generic-fcntl$F_SET_RW_HINT-accept4-syz_genetlink_get_family_id$mptcp-sendmsg$MPTCP_PM_CMD_ADD_ADDR-getpid-perf_event_open-perf_event_open-ptrace$getregset-wait4-io_uring_register$IORING_REGISTER_BUFFERS
1487	perf_event_open-fcntl$dupfd-ioctl$sock_SIOCGIFINDEX-perf_event_open-openat$vcsa-write$hidraw-read-clone3-ioctl$BTRFS_IOC_SUBVOL_SETFLAGS-openat$full-write$binfmt_elf64-write$cgroup_int-dup3-gettid-openat$vcsa-getpgrp-dup-openat
557	seccomp$SECCOMP_SET_MODE_FILTER_LISTENER-getpgrp