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Add end-to-end integration scenarios and tests for two previously
untested syscalls:
- mknodat(2): new dir-mknodat-fifo scenario creates an unprivileged
FIFO node (S_IFIFO, no CAP_MKNOD) via unix.Mknodat under AT_FDCWD
and unlinks it. TestDirMknodatFifo asserts enter_mknodat fires with
pathname@args[1] (after dirfd@args[0]), proven by a PathContains
match on the distinct fifo name, mirroring the mkdirat coverage.
- ioprio_get(2)/ioprio_set(2): new ioprio-basic scenario (the
I/O-priority analogues of getpriority/setpriority) issues the raw
syscalls (no x/sys wrapper exists), reading the current self I/O
priority and re-applying it, or a harmless unprivileged best-effort
value when none is set. TestIoprioBasic asserts enter_ioprio_get and
enter_ioprio_set fire (null enters, UNCLASSIFIED ret), mirroring
priority-basic. Realtime class is deliberately avoided as it needs
CAP_SYS_ADMIN.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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getpriority/setpriority (FamilyProcess, KindNull enter, UNCLASSIFIED ret)
were untested end-to-end: no ioworkload scenario invoked them. Add a safe,
unprivileged, non-disruptive priority-basic scenario that reads the current
nice value via getpriority(PRIO_PROCESS, 0) and re-applies that exact value
via setpriority(PRIO_PROCESS, 0, currentNice) — a byte-for-byte no-op,
mirroring the existing schedRoundtripAffinity round-trip. Note getpriority
returns 20-nice, so the value is converted back before re-applying.
Register the scenario in scenarios.go and add TestPriorityBasic, which
asserts enter_getpriority and enter_setpriority appear as null_event enters
attributed to the ioworkload process. Enter-tracepoint presence is the right
check given KindNull/UNCLASSIFIED (no fd/path/bytes to assert). Coverage
only — classification verified correct in audits 6u and pz.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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