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ww (selfhost): procrun propagates the real child exit code (fix #16)

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The shared fork/exec/wait helper collapsed every non-zero child exit to
1, so `ww_ww run <prog>` lost the program's real exit status (return 42
-> exit 1). The C ww driver's do_run returns WEXITSTATUS(status) — the
exact code. procrun now returns the real exit code instead of folding to
1; signal kill still returns 1 and fork/wait failure still returns -1,
matching do_run.

procrun is shared with the build-step callers (w6c/w6a/w6l), but they
only test `!= 0` (success vs failure), so a real non-zero code is still
`!= 0` — they are unaffected. dorun's final exec then reports the true
program exit code.

Driver behavior is not under byte-id (993 pins build_one output bytes,
not wait-status handling); 993 extended with table-driven run exit-code
rows (0/7/42) that fail under the old collapse-to-1.
This commit is contained in:
Hojun-Cho
2026-06-03 19:12:25 +09:00
parent 8199d6cdad
commit 0f0f2f4aa1
3 changed files with 63 additions and 11 deletions
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10
selfhost/cmd/ww/main.combined.ww
View File

@@ -2986,8 +2986,11 @@ fn joinpathlit(dir: *u8, name: str) *u8 = {
// ---- Subprocess plumbing ----------------------------------------------
// procrun — fork, execve `path` with `argv` (NULL-terminated), wait.
// Returns 0 on clean exit-0, 1 on any non-zero exit or signal kill,
// -1 on fork/wait failure.
// Returns the child's real exit code on clean exit, 1 on signal kill,
// -1 on fork/wait failure. Mirrors cmd/ww/main.c:do_run WEXITSTATUS:
// the build-step callers only test `!= 0`, so propagating the exact
// non-zero code leaves them unaffected while `dorun` reports the true
// program exit status (was collapsing every non-zero exit to 1; fix #16).
fn procrun(path: *u8, argv: **u8) i32 = {
let pid: i32 = os.fork();
if (pid < 0) {
@@ -3009,8 +3012,7 @@ fn procrun(path: *u8, argv: **u8) i32 = {
// next byte = exit code.
if ((status & 127i32) != 0) { return 1; };
let code: i32 = (status >> 8i32) & 255i32;
if (code != 0) { return 1; };
return 0;
return code;
};
// ---- `use` resolution + source concatenation --------------------------

10
selfhost/cmd/ww/main.ww
View File

@@ -152,8 +152,11 @@ fn joinpathlit(dir: *u8, name: str) *u8 = {
// ---- Subprocess plumbing ----------------------------------------------
// procrun — fork, execve `path` with `argv` (NULL-terminated), wait.
// Returns 0 on clean exit-0, 1 on any non-zero exit or signal kill,
// -1 on fork/wait failure.
// Returns the child's real exit code on clean exit, 1 on signal kill,
// -1 on fork/wait failure. Mirrors cmd/ww/main.c:do_run WEXITSTATUS:
// the build-step callers only test `!= 0`, so propagating the exact
// non-zero code leaves them unaffected while `dorun` reports the true
// program exit status (was collapsing every non-zero exit to 1; fix #16).
fn procrun(path: *u8, argv: **u8) i32 = {
let pid: i32 = os.fork();
if (pid < 0) {
@@ -175,8 +178,7 @@ fn procrun(path: *u8, argv: **u8) i32 = {
// next byte = exit code.
if ((status & 127i32) != 0) { return 1; };
let code: i32 = (status >> 8i32) & 255i32;
if (code != 0) { return 1; };
return 0;
return code;
};
// ---- `use` resolution + source concatenation --------------------------