[PATCH v2] Cygwin: pinfo: Fix exit code for non-cygwin apps which reads console.
Takashi Yano
takashi.yano@nifty.ne.jp
Mon Feb 28 09:32:02 GMT 2022
On Mon, 28 Feb 2022 10:21:32 +0100
Corinna Vinschen wrote:
> Hi Takashi,
>
> On Feb 27 09:46, Takashi Yano wrote:
> > - The recent commit "Cygwin: pinfo: Fix exit code when non-cygwin app
> > exits by Ctrl-C." did not fix enough the issue. If a non-cygwin app
> > is reading the console, it will not return STATUS_CONTROL_C_EXIT
> > even if it is terminated by Ctrl-C. As a result, the previous patch
> > does not take effect.
> > This patch solves this issue by setting sigExeced to SIGINT in
> > ctrl_c_handler(). In addition, sigExeced will be cleared if the app
> > does not terminated within predetermined time period. The reason is
> > that the app does not seem to be terminated by the signal sigExeced.
> > [...]
> > --- a/winsup/cygwin/spawn.cc
> > +++ b/winsup/cygwin/spawn.cc
> > @@ -953,7 +953,15 @@ child_info_spawn::worker (const char *prog_arg, const char *const *argv,
> > if (sem)
> > __posix_spawn_sem_release (sem, 0);
> > if (ptys_need_cleanup || cons_need_cleanup)
> > - WaitForSingleObject (pi.hProcess, INFINITE);
> > + {
> > + LONG prev_sigExeced = sigExeced;
> > + while (WaitForSingleObject (pi.hProcess, 100) == WAIT_TIMEOUT)
> > + /* If child process does not exit in predetermined time
> > + period, the process does not seem to be terminated by
> > + the signal sigExeced. Therefore, clear sigExeced here. */
> > + prev_sigExeced =
> > + InterlockedCompareExchange (&sigExeced, 0, prev_sigExeced);
> > + }
> > if (ptys_need_cleanup)
> > {
> > fhandler_pty_slave::cleanup_for_non_cygwin_app (&ptys_handle_set,
>
> Is it really necessary to run the InterlockedCompareExchange in a loop?
> What about
>
> if (WFMO(..., 100) == WAIT_TIMEOUT)
> {
> InterlockedCompareExchange (&sigExeced, 0, prev_sigExeced);
> WFMO(..., INFINITE);
> }
>
> ?
If non-cygwin app ignores Ctrl-C (like cmd.exe), and if
you hit Ctrl-C twice or more, sigExeced should be cleared
everytime on Ctrl-C. Your code clears sigExeced only once,
doesn't it?
--
Takashi Yano <takashi.yano@nifty.ne.jp>
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