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alarm(2) arranges for a SIGALRM after a given number of seconds; it is a
simplified setitimer(ITIMER_REAL) and, per alarm(2) NOTES, "alarm() and
setitimer(2) share the same timer; calls to one will interfere with use of
the other." The syscallFamilies table omitted alarm, so it fell through to
FamilyMisc while its siblings setitimer/getitimer/timer_create were correctly
FamilyTime — an adjtimex-style misclassification (cf. 7243b7c). Add
alarm -> FamilyTime and move it from Misc to Time in the tracing plan;
regenerate the family maps (trace IDs 468/469 now FamilyTime,
"alarm": "Time").
Kind classification (KindNull/null_event: the single arg is an unsigned int
seconds, no fd/path) and the UNCLASSIFIED return (seconds remaining, not a
byte count; alarm never fails) were already correct.
Also harden the misc-basic integration test with a deterministic
enter_alarm assertion (alarm(0) is issued unconditionally by the scenario;
the syscall-entry tracepoint always fires) so the alarm enter path is
covered end-to-end even though alarm is now FamilyTime rather than Misc.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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Add a misc-basic ioworkload scenario and an end-to-end integration test
for the previously-uncovered Misc syscall family.
The scenario exercises only the safe, unprivileged, non-blocking,
side-effect-free Misc syscalls: getcpu (raw SYS_GETCPU), uname /
sys_newuname (unix.Uname), sysinfo (unix.Sysinfo), vmsplice into a
self-created and self-drained pipe with a tiny buffer, and alarm(0) to
cancel any pending alarm. Code comments document why the remaining Misc
syscalls are intentionally excluded (CAP_SYS_ADMIN / global host
mutation, CAP_SYS_RAWIO / x86-only, Linux 6.13+ availability,
runtime-managed, or not user-callable).
misc_test.go asserts enter_getcpu, enter_newuname, and enter_sysinfo are
each traced at least once for the ioworkload process, restricting tracing
to the issued syscalls and keeping the existing PID/comm hermetic guards.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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