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openat2(2) is the one open-family syscall with a structurally distinct
argument layout: flags/mode live inside the open_how struct (args[2]),
not as a plain int, and args[3] is the struct size. The tracer correctly
reads the path from args[1] and omits flags (ev->flags = -1) rather than
misreading the struct ptr/size, and registers the returned fd->path
mapping via the shared handleOpenExit path. This was verified by
inspection but had no integration scenario, unlike open/openat/creat/
open_by_handle_at.
Add an open-openat2 ioworkload scenario issuing the raw openat2 syscall
(Go has no wrapper and routes Open through openat) and a TestOpenOpenat2
integration test asserting the enter_openat2 tracepoint captures the
path. Verified passing as root.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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- openEnoent: verifies ior captures enter_openat even when syscall fails (ENOENT)
- openRdonlyWrite: verifies tracing of open + failed write to read-only fd
- openPidFilter: verifies child process I/O is excluded by PID filtering
- AssertEventsAbsent helper with zero-value guard and 6 unit tests
Task: 348
Amp-Thread-ID: https://ampcode.com/threads/T-019c8185-55f4-72f0-8ddb-3be5e4002c0d
Co-authored-by: Amp <amp@ampcode.com>
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- rename_test.go: Fix PathContains to use destination names (newname.txt,
renameat-new.txt, renameat2-new.txt) since name_events use Newname as
the path in ior output, not the source name
- open_test.go: Change expected tracepoint from enter_openat to enter_creat
- scenarios.go: Use raw SYS_CREAT instead of Go's syscall.Creat which
wraps openat on amd64, so the creat tracepoint is actually exercised
- Created task 350 for close_range path resolution bug found during review
Amp-Thread-ID: https://ampcode.com/threads/T-019c8178-1c1f-7509-9ac9-bd48b970945b
Co-authored-by: Amp <amp@ampcode.com>
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