win32: convert exit codes

Add two utility functions to convert Windows process exit codes.

- exit_code_to_wait_status() converts to a POSIX wait status.
  This is used in ash and the implementations of system(3) and
  mingw_wait3().

- exit_code_to_posix() converts to a POSIX exit code.  (Not that
  POSIX has much to say about them.)

As a result it's possible for more applets to report when child
processes are killed as if by a signal.  'time', 'drop' and 'su -W',
for example.

Adds 64-80 bytes.

1 files changed, 2 insertions, 0 deletions

diff --git a/loginutils/suw32.c b/loginutils/suw32.c
index 79e8415a8..240a692bc 100644
--- a/loginutils/suw32.c
+++ b/loginutils/suw32.c
@@ -112,6 +112,8 @@ int suw32_main(int argc UNUSED_PARAM, char **argv)
                 WaitForSingleObject(info.hProcess, INFINITE);
                 if (!GetExitCodeProcess(info.hProcess, &r))
                         r = 1;
+                else
+                        r = exit_code_to_posix(r);
                 CloseHandle(info.hProcess);
                 return r;
         }