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setup_pseudoconsole(): handle missing/incorrect helper gracefully

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When `cygwin-console-helper.exe` is either missing, or corresponds to a
different Cygwin runtime, we currently wait forever while setting up
access to the pseudo console, even long after the process is gone that
was supposed to signal that it set up access to the pseudo console.

Let's handle that more gracefully: if the process exited without
signaling, we cannot use the pseudo console. In that case, let's just
fall back to not using it.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
This commit is contained in:
Johannes Schindelin 2020-05-02 15:03:07 +02:00 committed by Corinna Vinschen
parent 453b6d17bf
commit 717db9fd1c
1 changed files with 17 additions and 1 deletions
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18
winsup/cygwin/fhandler_tty.cc
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@ -3496,7 +3496,23 @@ fhandler_pty_master::setup_pseudoconsole ()
TRUE, EXTENDED_STARTUPINFO_PRESENT,
NULL, NULL, &si_helper.StartupInfo, &pi_helper))
goto cleanup_event_and_pipes;
WaitForSingleObject (hello, INFINITE);
for (;;)
{
DWORD wait_result = WaitForSingleObject (hello, 500);
if (wait_result == WAIT_OBJECT_0)
break;
if (wait_result != WAIT_TIMEOUT)
goto cleanup_helper_process;
DWORD exit_code;
if (!GetExitCodeProcess(pi_helper.hProcess, &exit_code))
goto cleanup_helper_process;
if (exit_code == STILL_ACTIVE)
continue;
if (exit_code != 0 ||
WaitForSingleObject (hello, 500) != WAIT_OBJECT_0)
goto cleanup_helper_process;
break;
}
CloseHandle (hello);
CloseHandle (pi_helper.hThread);
/* Retrieve pseudo console handles */