Removes the local os.timespec (sec, nsec) struct in favour of
time.instant from lib/time. lib/os now `use time;`. filestat's
atime/mtime/ctime change type with byte-identical layout
(i64+i64=16B both sides), so .sec / .nsec accessors at all caller
sites work unchanged.
Rule 12: simple data + mirror Hare. Two same-layout types — one
Hare-canonical, one not — is exactly the structural divergence the
rule forbids. Single-source-of-truth; no transitional alias.
Citations: ref/hare/fs/types.ha:141 (Hare's fs::filestat carries
time::instant), ref/hare/time/instant.ha:9 (canonical layout).
Caller impact (sole reader): lib/os/stattest.ww (.sec / .nsec
unchanged; one comment line refreshed). examples/cmatrix migrated
already in 7e9bede. No selfhost/cmd/* reads mtime/atime/ctime.
Test wiring: lib/os/os.ww removed from 900_stdlib.c's standalone-
w6c-codegen list (cross-module type ref now needs the driver's
module concatenation, same reason lib/bufio and lib/fmt graduated
off earlier). Coverage stays at 976_stat_run via stattest.ww.
Makefile dep edges for the five wwstage targets gain
lib/time/time.ww so changes to it trigger wwstage rebuild.
lib/time is now in the toolchain transitive chain via lib/os. No
selfhost cmd calls time.add/time.diff today; bootstrap is safe.
Latent risk: any future selfhost edit adding time.add/time.diff
would surface task #15 (nested-if label-counter skew in lib/time/
add) as a bootstrap regression. File a fix-#15 before such an edit.
Bootstrap byte-id: ww2 == ww3 == ww4 for all five wwstage tools.
Path-shaped entrypoints now take str: open, tryopen, access, remove,
mkdir, rmdir, mkdirs, stat, lstat, exists, execve (path arg only).
Each cites its Hare source (ref/hare/os/*.ha, ref/hare/sys/+linux/
*.ha).
New internal kpath(str) *u8 copies into module-level pathbuf: [4096]u8
and NUL-terminates; mirrors ref/hare/sys/+linux/syscalls.ha:25,53.
Non-reentrant — graduates with thread story. mkdirs flattens to one
kpath at entry then walks pathbuf invoking raw SYS_mkdir to avoid
nested kpath clobber.
One Hare divergence at kpath: ships *u8 with nil ENAMETOOLONG sentinel
instead of (*const u8 | errno). Reason: wwstage over-allocates
1-word-payload tagged returns to 24B (cstage emits 16B); filed as
follow-up. Repro at .ai/probe_tagged_return_pointer_payload.ww;
graduates when fix lands.
Each selfhost cmd grew a private pathstr(*u8) str (cstrlen + bs) for
remaining *u8 path sites; w6l shares via obj.ww. Probe 7 in smoke
updated.
Tests 975/976/981 cover migrated entrypoints; 976 extended with two
ENAMETOOLONG rows (-36 for stat, false for exists).
Hare-shaped filestat introspection. New types: filestat (80B,
mirrors fs::filestat ref/hare/fs/types.ha:141), mode (31-member
enum mirroring fs::mode ref/hare/fs/types.ha:63), stat_mask (7 bits
mirroring fs::stat_mask ref/hare/fs/types.ha:129), timespec (i64+i64,
layout-compatible with future lib/time::instant).
APIs: stat / lstat / fstat (*filestat, *u8|i32) (void|oserror) over
SYS_newfstatat (nr=262). The out-param shape sidesteps the cgreturn
24B ABI cap; commented inline. exists(*u8) bool goes through the
syscall directly rather than wrapping stat()? — dodges task #22's
80B-scrutinee match-slot disagreement until that lands.
Three latent cgen workarounds in tree, all pointer'd to filed tasks:
#22: os.exists sidesteps the (void|oserror) match shape
#24: `at` enum bundles AT_FDCWD/SYMLINK_NOFOLLOW/EMPTY_PATH instead
of three top-level `def`s (negative-literal def DATA omit)
#25: kstat.mode typed as `mode` (enum) rather than u32 to skip the
redundant u32→enum cast emit
Tests: 976_stat_run, 9 rows — stat/lstat/fstat × regfile/dir/symlink
plus exists × {regfile,dir,noent}. Row 1 also pins perm-bit and
atime/mtime/ctime!=0 to catch silent kstat→filestat offset miscompiles
(kstat fields at 72/88/104).
Graduation to lib/fs when it ships is noted inline; signatures stay
rename-compatible.
