ioprio_set/ioprio_get: classify as Process family

Audit of ioprio_set found a family inconsistency. ioprio_set(which, who,
ioprio) and ioprio_get(which, who) query/set the I/O scheduling class and
priority of a process, process group, or user. They are the direct
I/O-priority analogues of getpriority/setpriority (the CPU nice value) and
share the identical which/who selector signature, yet were falling through to
FamilyMisc while getpriority/setpriority are FamilyProcess.

Reclassify both ioprio syscalls to FamilyProcess for consistency with their
priority siblings, update docs/syscall-tracing-plan.md, and regenerate the
tracepoint/type artifacts (mage generate is idempotent).

Argument capture is unchanged and confirmed correct: the args are all ints
(which/who/ioprio), none named fd/path, so ClassifyFormat returns KindNone and
the generator promotes the enter format to KindNull (null_event). In
particular the 'who' argument (a pid/pgid/uid, never an fd) is not
misclassified as KindFd. The exit is a ret_event (UNCLASSIFIED, int 0/-1).

Add lock-in tests:
- TestClassifyIoprioNullKind asserts KindNone/KindNull using the real kernel
  tracepoint fields, proving 'who' is not captured as an fd.
- Family assertions for the ioprio pair alongside getpriority/setpriority so a
  stray reclassification of any of them trips the test.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/docs/syscall-tracing-plan.md b/docs/syscall-tracing-plan.md
index 68b5f74..cbc256d 100644
--- a/docs/syscall-tracing-plan.md
+++ b/docs/syscall-tracing-plan.md
@@ -43,10 +43,10 @@ sudo ./ior -trace-syscalls openat,recvmsg,nanosleep -no-trace-kinds null
 - FS: `access`, `cachestat`, `chdir`, `chmod`, `chown`, `chroot`, `close`, `close_range`, `copy_file_range`, `creat`, `dup`, `dup2`, `dup3`, `faccessat`, `faccessat2`, `fadvise64`, `fallocate`, `fchdir`, `fchmod`, `fchmodat`, `fchmodat2`, `fchown`, `fchownat`, `fcntl`, `fdatasync`, `fgetxattr`, `flistxattr`, `flock`, `fremovexattr`, `fsconfig`, `fsetxattr`, `fsmount`, `fsopen`, `fspick`, `fstatfs`, `fsync`, `ftruncate`, `futimesat`, `getcwd`, `getdents`, `getdents64`, `getxattr`, `getxattrat`, `ioctl`, `lchown`, `lgetxattr`, `link`, `linkat`, `listmount`, `listns`, `listxattr`, `listxattrat`, `llistxattr`, `lremovexattr`, `lseek`, `lsetxattr`, `mkdir`, `mkdirat`, `mknod`, `mknodat`, `mount`, `mount_setattr`, `move_mount`, `msync`, `name_to_handle_at`, `newfstat`, `newfstatat`, `newlstat`, `newstat`, `open`, `open_by_handle_at`, `open_tree`, `open_tree_attr`, `openat`, `openat2`, `pread64`, `preadv`, `preadv2`, `pwrite64`, `pwritev`, `pwritev2`, `quotactl`, `quotactl_fd`, `read`, `readahead`, `readlink`, `readlinkat`, `readv`, `removexattr`, `removexattrat`, `rename`, `renameat`, `renameat2`, `rmdir`, `setxattr`, `setxattrat`, `statfs`, `statmount`, `statx`, `swapoff`, `swapon`, `symlink`, `symlinkat`, `sync`, `sync_file_range`, `syncfs`, `truncate`, `umount`, `unlink`, `unlinkat`, `ustat`, `utime`, `utimensat`, `utimes`, `write`, `writev`
 - IPC: `eventfd`, `eventfd2`, `futex`, `futex_requeue`, `futex_wait`, `futex_waitv`, `futex_wake`, `inotify_add_watch`, `inotify_init`, `inotify_init1`, `inotify_rm_watch`, `memfd_create`, `memfd_secret`, `mq_getsetattr`, `mq_notify`, `mq_open`, `mq_timedreceive`, `mq_timedsend`, `mq_unlink`, `msgctl`, `msgget`, `msgrcv`, `msgsnd`, `pidfd_getfd`, `pidfd_open`, `pidfd_send_signal`, `pipe`, `pipe2`, `semctl`, `semget`, `semop`, `semtimedop`, `shmat`, `shmctl`, `shmdt`, `shmget`, `signalfd`, `signalfd4`, `timerfd_create`, `timerfd_gettime`, `timerfd_settime`, `userfaultfd`
 - Memory: `brk`, `madvise`, `map_shadow_stack`, `mbind`, `membarrier`, `migrate_pages`, `mincore`, `mlock`, `mlock2`, `mlockall`, `mmap`, `move_pages`, `mprotect`, `mremap`, `mseal`, `munlock`, `munlockall`, `munmap`, `pkey_alloc`, `pkey_free`, `pkey_mprotect`, `process_madvise`, `process_mrelease`, `process_vm_readv`, `process_vm_writev`, `remap_file_pages`, `set_mempolicy`, `set_mempolicy_home_node`
-- Misc: `acct`, `adjtimex`, `alarm`, `fanotify_init`, `fanotify_mark`, `file_getattr`, `file_setattr`, `get_robust_list`, `getcpu`, `ioperm`, `iopl`, `ioprio_get`, `ioprio_set`, `kexec_load`, `modify_ldt`, `newuname`, `rseq`, `set_robust_list`, `setdomainname`, `sethostname`, `sysfs`, `sysinfo`, `syslog`, `uprobe`, `uretprobe`, `vmsplice`
+- Misc: `acct`, `adjtimex`, `alarm`, `fanotify_init`, `fanotify_mark`, `file_getattr`, `file_setattr`, `get_robust_list`, `getcpu`, `ioperm`, `iopl`, `kexec_load`, `modify_ldt`, `newuname`, `rseq`, `set_robust_list`, `setdomainname`, `sethostname`, `sysfs`, `sysinfo`, `syslog`, `uprobe`, `uretprobe`, `vmsplice`
 - Network: `accept`, `accept4`, `bind`, `connect`, `getpeername`, `getsockname`, `getsockopt`, `listen`, `recvfrom`, `recvmmsg`, `recvmsg`, `sendfile64`, `sendmmsg`, `sendmsg`, `sendto`, `setsockopt`, `shutdown`, `socket`, `socketpair`, `splice`, `tee`
 - Polling: `epoll_create`, `epoll_create1`, `epoll_ctl`, `epoll_pwait`, `epoll_pwait2`, `epoll_wait`, `poll`, `ppoll`, `pselect6`, `select`
-- Process: `arch_prctl`, `clone`, `clone3`, `execve`, `execveat`, `exit`, `exit_group`, `fork`, `getegid`, `geteuid`, `getgid`, `getgroups`, `getpgid`, `getpgrp`, `getpid`, `getppid`, `getpriority`, `getresgid`, `getresuid`, `getrlimit`, `getrusage`, `getsid`, `gettid`, `getuid`, `kcmp`, `personality`, `pivot_root`, `prctl`, `prlimit64`, `reboot`, `restart_syscall`, `set_tid_address`, `setfsgid`, `setfsuid`, `setgid`, `setgroups`, `setns`, `setpgid`, `setpriority`, `setregid`, `setresgid`, `setresuid`, `setreuid`, `setrlimit`, `setsid`, `setuid`, `umask`, `unshare`, `vfork`, `vhangup`, `wait4`, `waitid`
+- Process: `arch_prctl`, `clone`, `clone3`, `execve`, `execveat`, `exit`, `exit_group`, `fork`, `getegid`, `geteuid`, `getgid`, `getgroups`, `getpgid`, `getpgrp`, `getpid`, `getppid`, `getpriority`, `getresgid`, `getresuid`, `getrlimit`, `getrusage`, `getsid`, `gettid`, `getuid`, `ioprio_get`, `ioprio_set`, `kcmp`, `personality`, `pivot_root`, `prctl`, `prlimit64`, `reboot`, `restart_syscall`, `set_tid_address`, `setfsgid`, `setfsuid`, `setgid`, `setgroups`, `setns`, `setpgid`, `setpriority`, `setregid`, `setresgid`, `setresuid`, `setreuid`, `setrlimit`, `setsid`, `setuid`, `umask`, `unshare`, `vfork`, `vhangup`, `wait4`, `waitid`
 - Sched: `sched_get_priority_max`, `sched_get_priority_min`, `sched_getaffinity`, `sched_getattr`, `sched_getparam`, `sched_getscheduler`, `sched_rr_get_interval`, `sched_setaffinity`, `sched_setattr`, `sched_setparam`, `sched_setscheduler`, `sched_yield`
 - Security: `add_key`, `bpf`, `capget`, `capset`, `delete_module`, `finit_module`, `get_mempolicy`, `getrandom`, `init_module`, `kexec_file_load`, `keyctl`, `landlock_add_rule`, `landlock_create_ruleset`, `landlock_restrict_self`, `lsm_get_self_attr`, `lsm_list_modules`, `lsm_set_self_attr`, `perf_event_open`, `ptrace`, `request_key`, `seccomp`
 - Signals: `kill`, `pause`, `rt_sigaction`, `rt_sigpending`, `rt_sigprocmask`, `rt_sigqueueinfo`, `rt_sigreturn`, `rt_sigsuspend`, `rt_sigtimedwait`, `rt_tgsigqueueinfo`, `sigaltstack`, `tgkill`, `tkill`