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Cygwin: FIFO: fix clone 

After copyto is called, make the new fhandler's pipe_name point to the
new fhandler's pipe_name_buf, which is a *copy* of the old fhandler's
pipe_name_buf.  Previously, get_pipe_name would return the wrong
result after a clone/dup, causing create_pipe_instance and open_pipe
to fail.

Also, stop the listen_client thread when cloning.  Otherwise the
thread can keep accepting connections that the cloned fhandler won't
know about.

Do this via a new method fhandler_fifo::stop_listen_client, extracted
from fhandler_fifo::close.
This commit is contained in:
Ken Brown 2019-04-14 19:16:02 +00:00 committed by Corinna Vinschen
parent c5bc7a8065
commit 7b28776d3f
2 changed files with 21 additions and 5 deletions
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6
winsup/cygwin/fhandler.h
View File

@ -1280,6 +1280,7 @@ class fhandler_fifo: public fhandler_base
int disconnect_and_reconnect (int);
int add_client_handler ();
bool listen_client ();
int stop_listen_client ();
public:
fhandler_fifo ();
bool hit_eof ();
@ -1326,7 +1327,12 @@ public:
{
void *ptr = (void *) ccalloc (malloc_type, 1, sizeof (fhandler_fifo));
fhandler_fifo *fhf = new (ptr) fhandler_fifo (ptr);
/* We don't want our client list to change any more. */
stop_listen_client ();
copyto (fhf);
/* fhf->pipe_name_buf is a *copy* of this->pipe_name_buf, but
fhf->pipe_name.Buffer == this->pipe_name_buf. */
fhf->pipe_name.Buffer = fhf->pipe_name_buf;
for (int i = 0; i < nhandlers; i++)
fhf->fc_handler[i].fh = fc_handler[i].fh->clone ();
return fhf;

20
winsup/cygwin/fhandler_fifo.cc
View File

@ -812,9 +812,9 @@ fifo_client_handler::close ()
}
int
fhandler_fifo::close ()
fhandler_fifo::stop_listen_client ()
{
int res = 0;
int ret = 0;
HANDLE evt = InterlockedExchangePointer (&lct_termination_evt, NULL);
HANDLE thr = InterlockedExchangePointer (&listen_client_thr, NULL);
if (thr)
@ -825,19 +825,29 @@ fhandler_fifo::close ()
DWORD err;
GetExitCodeThread (thr, &err);
if (err)
debug_printf ("listen_client_thread exited with code %d", err);
{
ret = -1;
debug_printf ("listen_client_thread exited with error, %E");
}
CloseHandle (thr);
}
if (evt)
CloseHandle (evt);
return ret;
}
int
fhandler_fifo::close ()
{
int ret = stop_listen_client ();
if (read_ready)
CloseHandle (read_ready);
if (write_ready)
CloseHandle (write_ready);
for (int i = 0; i < nhandlers; i++)
if (fc_handler[i].close () < 0)
res = -1;
return fhandler_base::close () || res;
ret = -1;
return fhandler_base::close () || ret;
}
int