WasmVM: stdio/wchar/poll/select/fmtmsg os-test failures #45
Description
Description
17 os-test binaries newly compiled after sysroot override migration (US-023) fail at runtime. These are implementation gaps in the WASM sandbox's I/O handling.
Affected tests
stdio (stdin reads fail — stdin not connected in sandbox)
- basic/stdio/getchar
- basic/stdio/scanf
- basic/stdio/vscanf
stdio (stdout behavior differs)
- basic/stdio/printf
- basic/stdio/putchar
- basic/stdio/puts
- basic/stdio/vprintf
wchar (stdin reads fail)
- basic/wchar/getwchar
- basic/wchar/wscanf
- basic/wchar/vwscanf
wchar (stdout behavior differs)
- basic/wchar/putwchar
- basic/wchar/wprintf
- basic/wchar/vwprintf
poll/select
- basic/poll/poll
- basic/sys_select/select
- basic/sys_time/select
fmtmsg
- basic/fmtmsg/fmtmsg
Root cause
These tests exercise I/O paths (stdin/stdout/poll/select) that either aren't connected in the WASM sandbox or behave differently from native Linux.