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lib/os+test: add stat / lstat / fstat / exists

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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.
This commit is contained in:
Hojun-Cho
2026-05-16 02:42:41 +09:00
parent db2b05bbe5
commit 2f9d6dc43a
10 changed files with 1998 additions and 0 deletions
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5
Makefile
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@@ -241,6 +241,7 @@ TESTS = $(BIN)/test_smoke $(BIN)/test_lex $(BIN)/test_parse $(BIN)/test_check \
$(BIN)/test_dyn_ww $(BIN)/test_selfcheck $(BIN)/test_at_test_ww \
$(BIN)/test_fmt_run $(BIN)/test_log_run $(BIN)/test_fnmatch_run \
$(BIN)/test_shlex_run $(BIN)/test_getenv_run $(BIN)/test_dirs_run \
$(BIN)/test_stat_run \
$(BIN)/test_memio_run $(BIN)/test_temp_run $(BIN)/test_getopt_run \
$(BIN)/test_base32_run $(BIN)/test_base64_run \
$(BIN)/test_adler32_run $(BIN)/test_crc16_run \
@@ -498,6 +499,10 @@ $(BIN)/test_dirs_run: test/wcc/975_dirs_run.c $(BIN)/ww $(BIN)/w6c \
$(BIN)/w6a $(BIN)/w6l $(LIB)/libwwrt.a | $(BIN)
$(CC) $(CFLAGS) -o $@ $<
$(BIN)/test_stat_run: test/wcc/976_stat_run.c $(BIN)/ww $(BIN)/w6c \
$(BIN)/w6a $(BIN)/w6l $(LIB)/libwwrt.a | $(BIN)
$(CC) $(CFLAGS) -o $@ $<
$(BIN)/test_memio_run: test/wcc/980_memio_run.c $(BIN)/ww $(BIN)/w6c \
$(BIN)/w6a $(BIN)/w6l $(LIB)/libwwrt.a | $(BIN)
$(CC) $(CFLAGS) -o $@ $<