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Cygwin: pty: Add a workaround for issue of starting a lot of mintty. 

- If a lot of mintty are started in a short time from a mintty, some
  of them hang with empty screen, crash immediately or hang on exiting
  mintty. The following report seems to be related to this issue.
    https://cygwin.com/pipermail/cygwin/2020-August/245751.html
  The cause is not clear at all, but this patch seems to solve the
  issue.
This commit is contained in:
Takashi Yano 2020-08-11 13:16:52 +09:00 committed by Corinna Vinschen
parent a44bc679a4
commit f14d123ac6
1 changed files with 11 additions and 4 deletions
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15
winsup/cygwin/spawn.cc
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@ -177,7 +177,7 @@ find_exec (const char *name, path_conv& buf, const char *search,
/* Utility for child_info_spawn::worker. */
static HANDLE
handle (int fd, bool writing)
handle (int fd, bool writing, bool iscygwin)
{
HANDLE h;
cygheap_fdget cfd (fd);
@ -188,6 +188,11 @@ handle (int fd, bool writing)
h = INVALID_HANDLE_VALUE;
else if (!writing)
h = cfd->get_handle ();
else if (cfd->get_major () == DEV_PTYS_MAJOR && iscygwin)
{
fhandler_pty_slave *ptys = (fhandler_pty_slave *)(fhandler_base *) cfd;
h = ptys->get_output_handle_cyg ();
}
else
h = cfd->get_output_handle ();
@ -625,9 +630,11 @@ child_info_spawn::worker (const char *prog_arg, const char *const *argv,
/* Set up needed handles for stdio */
si.dwFlags = STARTF_USESTDHANDLES;
si.hStdInput = handle ((in__stdin < 0 ? 0 : in__stdin), false);
si.hStdOutput = handle ((in__stdout < 0 ? 1 : in__stdout), true);
si.hStdError = handle (2, true);
si.hStdInput = handle ((in__stdin < 0 ? 0 : in__stdin), false,
iscygwin ());
si.hStdOutput = handle ((in__stdout < 0 ? 1 : in__stdout), true,
iscygwin ());
si.hStdError = handle (2, true, iscygwin ());
si.cb = sizeof (si);