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* fhandle.h (fhandler_pipe::create_guard): Revert change which eliminated

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SECURITY_ATTRIBUTES argument.
* pipe.cc (fhandler_pipe::open): Duplicate guard from other process and protect
it appropriately.  Eliminate unneeded writepipe_exists temporary variable.  Set
inheritance appropriately.
(fhandler_pipe::set_close_on_exec): Revert change which eliminated handling
guard inheritance.
(fhandler_pipe::fixup_after_fork): Ditto.  Use correct name of entity being
checked by fork_fixup.
(fhandler_pipe::fixup_after_exec): Don't bother with guard here.
(fhandler_pipe::dup): Cosmetic changes and revert creation of writepipe_exists
as noninheritable.
(fhandler_pipe::create): Revert change which eliminated SECURITY_ATTRIBUTES
argument.  Revert change which always made writepipe_exists noninheritable.
This commit is contained in:
Christopher Faylor
2006-05-21 21:02:52 +00:00
parent 9c9959a512
commit 8ae1d98d8e
3 changed files with 64 additions and 32 deletions
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18
winsup/cygwin/ChangeLog
View File

@@ -1,3 +1,21 @@
2006-05-21 Christopher Faylor <cgf@timesys.com>
* fhandle.h (fhandler_pipe::create_guard): Revert change which
eliminated SECURITY_ATTRIBUTES argument.
* pipe.cc (fhandler_pipe::open): Duplicate guard from other process and
protect it appropriately. Eliminate unneeded writepipe_exists
temporary variable. Set inheritance appropriately.
(fhandler_pipe::set_close_on_exec): Revert change which eliminated
handling guard inheritance.
(fhandler_pipe::fixup_after_fork): Ditto. Use correct name of entity
being checked by fork_fixup.
(fhandler_pipe::fixup_after_exec): Don't bother with guard here.
(fhandler_pipe::dup): Cosmetic changes and revert creation of
writepipe_exists as noninheritable.
(fhandler_pipe::create): Revert change which eliminated
SECURITY_ATTRIBUTES argument. Revert change which always made
writepipe_exists noninheritable.
2006-05-21 Christopher Faylor <cgf@timesys.com>
* debug.cc (add_handle): Print handle value when collision detected.

10
winsup/cygwin/fhandler.h
View File

@@ -513,11 +513,11 @@ public:
void __stdcall read (void *ptr, size_t& len) __attribute__ ((regparm (3)));
int open (int flags, mode_t mode = 0);
int close ();
void create_guard ()
{
guard = CreateMutex (&sec_none, FALSE, NULL);
ProtectHandleINH (guard);
}
void create_guard (SECURITY_ATTRIBUTES *sa)
{
guard = CreateMutex (sa, FALSE, NULL);
ProtectHandleINH (guard);
}
int dup (fhandler_base *child);
int ioctl (unsigned int cmd, void *);
void fixup_in_child ();

68
winsup/cygwin/pipe.cc
View File

@@ -1,7 +1,7 @@
/* pipe.cc: pipe for Cygwin.
Copyright 1996, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
2006 Red Hat, Inc.
Copyright 1996, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006
Hat, Inc.
This file is part of Cygwin.
@@ -42,7 +42,7 @@ extern "C" int sscanf (const char *, const char *, ...);
int
fhandler_pipe::open (int flags, mode_t mode)
{
HANDLE proc, pipe_hdl, nio_hdl = NULL, nwrp_hdl = NULL;
HANDLE proc, pipe_hdl, nio_hdl = NULL;
fhandler_pipe *fh = NULL;
size_t size;
int pid, rwflags = (flags & O_ACCMODE);
@@ -93,25 +93,35 @@ fhandler_pipe::open (int flags, mode_t mode)
set_errno (EACCES);
goto out;
}
bool inh = !(flags & O_NOINHERIT);
if (!DuplicateHandle (proc, pipe_hdl, hMainProc, &nio_hdl,
0, false, DUPLICATE_SAME_ACCESS))
0, inh, DUPLICATE_SAME_ACCESS))
{
__seterrno ();
goto out;
}
if (fh->writepipe_exists
&& !DuplicateHandle (proc, fh->writepipe_exists, hMainProc, &nwrp_hdl,
0, false, DUPLICATE_SAME_ACCESS))
if (!fh->guard)
/* nothing to do */;
else if (DuplicateHandle (proc, fh->guard, hMainProc, &guard,
0, inh, DUPLICATE_SAME_ACCESS))
ProtectHandle (guard);
else
{
__seterrno ();
goto out;
}
if (!fh->writepipe_exists)
/* nothing to do */;
else if (!DuplicateHandle (proc, fh->writepipe_exists,
hMainProc, &writepipe_exists,
0, inh, DUPLICATE_SAME_ACCESS))
{
__seterrno ();
goto out;
}
if (fh->read_state)
create_read_state (2);
if (fh->guard)
create_guard ();
init (nio_hdl, fh->get_access (), mode & O_TEXT ?: O_BINARY);
writepipe_exists = nwrp_hdl;
if (flags & O_NOINHERIT)
close_on_exec (true);
uninterruptible_io (fh->uninterruptible_io ());
@@ -119,8 +129,10 @@ fhandler_pipe::open (int flags, mode_t mode)
CloseHandle (proc);
return 1;
out:
if (nwrp_hdl)
CloseHandle (nwrp_hdl);
if (writepipe_exists)
CloseHandle (writepipe_exists);
if (guard)
CloseHandle (guard);
if (nio_hdl)
CloseHandle (nio_hdl);
if (fh)
@@ -142,6 +154,8 @@ void
fhandler_pipe::set_close_on_exec (bool val)
{
fhandler_base::set_close_on_exec (val);
if (guard)
set_no_inheritance (guard, val);
if (writepipe_exists)
set_no_inheritance (writepipe_exists, val);
}
@@ -230,16 +244,16 @@ fhandler_pipe::fixup_after_exec ()
{
if (!close_on_exec ())
fixup_in_child ();
else if (guard)
ForceCloseHandle (guard);
}
void
fhandler_pipe::fixup_after_fork (HANDLE parent)
{
fhandler_base::fixup_after_fork (parent);
if (guard)
fork_fixup (parent, guard, "guard");
if (writepipe_exists)
fork_fixup (parent, writepipe_exists, "guard");
fork_fixup (parent, writepipe_exists, "writepipe_exists");
fixup_in_child ();
}
@@ -253,10 +267,10 @@ fhandler_pipe::dup (fhandler_base *child)
if (get_handle () && fhandler_base::dup (child))
goto err;
if (guard == NULL)
ftp->guard = NULL;
if (!guard)
/* nothing to do */;
else if (DuplicateHandle (hMainProc, guard, hMainProc, &ftp->guard, 0, true,
DUPLICATE_SAME_ACCESS))
DUPLICATE_SAME_ACCESS))
ProtectHandle1 (ftp->guard, guard);
else
{
@@ -264,21 +278,21 @@ fhandler_pipe::dup (fhandler_base *child)
goto err;
}
if (writepipe_exists == NULL)
ftp->writepipe_exists = NULL;
if (!writepipe_exists)
/* nothing to do */;
else if (!DuplicateHandle (hMainProc, writepipe_exists, hMainProc,
&ftp->writepipe_exists, 0, false,
&ftp->writepipe_exists, 0, true,
DUPLICATE_SAME_ACCESS))
{
debug_printf ("couldn't duplicate writepipe_exists %p, %E", writepipe_exists);
goto err;
}
if (read_state == NULL)
ftp->read_state = NULL;
if (!read_state)
/* nothing to do */;
else if (DuplicateHandle (hMainProc, read_state, hMainProc,
&ftp->read_state, 0, 0,
DUPLICATE_SAME_ACCESS))
&ftp->read_state, 0, false,
DUPLICATE_SAME_ACCESS))
ProtectHandle1 (ftp->read_state, read_state);
else
{
@@ -439,13 +453,13 @@ fhandler_pipe::create (fhandler_pipe *fhs[2], unsigned psize, int mode, bool fif
fhs[0]->create_read_state (2);
res = 0;
fhs[0]->create_guard ();
fhs[0]->create_guard (sa);
if (wincap.has_unreliable_pipes ())
{
char buf[80];
int count = pipecount++; /* FIXME: Should this be InterlockedIncrement? */
__small_sprintf (buf, pipeid_fmt, myself->pid, count);
fhs[1]->writepipe_exists = CreateEvent (&sec_none_nih, TRUE, FALSE, buf);
fhs[1]->writepipe_exists = CreateEvent (sa, TRUE, FALSE, buf);
fhs[0]->orig_pid = myself->pid;
fhs[0]->id = count;
}