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Cygwin: AF_UNIX: fix creation of npfs handle

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The handle to the device is never needed.  As the name impies,
FSCTL_PIPE_WAIT works on the file system, not on the device level.

Drop opening the device and make sure to open only one handle to NPFS.

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
This commit is contained in:
Corinna Vinschen 2018-03-07 15:48:21 +01:00
parent d69bcdd671
commit 2f2a75b7bb
3 changed files with 23 additions and 25 deletions
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8
winsup/cygwin/fhandler.h
View File

@ -852,12 +852,6 @@ class sun_name_t
class fhandler_socket_unix : public fhandler_socket
{
enum npfs_hdl_t
{
NPFS_DEVICE,
NPFS_DIR
};
protected:
SRWLOCK conn_lock;
SRWLOCK bind_lock;
@ -886,7 +880,7 @@ class fhandler_socket_unix : public fhandler_socket
void set_pipe_non_blocking (bool nonblocking);
int send_my_name ();
int recv_peer_name ();
static NTSTATUS npfs_handle (HANDLE &nph, npfs_hdl_t type);
static NTSTATUS npfs_handle (HANDLE &nph);
HANDLE create_pipe ();
HANDLE create_pipe_instance ();
NTSTATUS open_pipe (HANDLE &ph, PUNICODE_STRING pipe_name);

37
winsup/cygwin/fhandler_socket_unix.cc
View File

@ -620,28 +620,33 @@ fhandler_socket_unix::recv_peer_name ()
}
NTSTATUS
fhandler_socket_unix::npfs_handle (HANDLE &nph, npfs_hdl_t type)
fhandler_socket_unix::npfs_handle (HANDLE &nph)
{
static NO_COPY HANDLE npfs_devh;
static NO_COPY SRWLOCK npfs_lock;
static NO_COPY HANDLE npfs_dirh;
HANDLE &npfs_ref = (type == NPFS_DEVICE) ? npfs_devh : npfs_dirh;
PUNICODE_STRING path = (type == NPFS_DEVICE) ? &ro_u_npfs : &ro_u_npfs_dir;
NTSTATUS status;
NTSTATUS status = STATUS_SUCCESS;
OBJECT_ATTRIBUTES attr;
IO_STATUS_BLOCK io;
if (!npfs_ref)
/* Lockless after first call. */
if (npfs_dirh)
{
InitializeObjectAttributes (&attr, path, 0, NULL, NULL);
status = NtOpenFile (&npfs_ref, FILE_READ_ATTRIBUTES | SYNCHRONIZE,
nph = npfs_dirh;
return STATUS_SUCCESS;
}
AcquireSRWLockExclusive (&npfs_lock);
if (!npfs_dirh)
{
InitializeObjectAttributes (&attr, &ro_u_npfs, 0, NULL, NULL);
status = NtOpenFile (&npfs_dirh, FILE_READ_ATTRIBUTES | SYNCHRONIZE,
&attr, &io, FILE_SHARE_READ | FILE_SHARE_WRITE,
FILE_SYNCHRONOUS_IO_NONALERT);
if (!NT_SUCCESS (status))
return status;
}
nph = npfs_ref;
return STATUS_SUCCESS;
ReleaseSRWLockExclusive (&npfs_lock);
if (NT_SUCCESS (status))
nph = npfs_dirh;
return status;
}
HANDLE
@ -658,7 +663,7 @@ fhandler_socket_unix::create_pipe ()
ULONG max_instances;
LARGE_INTEGER timeout;
status = npfs_handle (npfsh, NPFS_DIR);
status = npfs_handle (npfsh);
if (!NT_SUCCESS (status))
{
__seterrno_from_nt_status (status);
@ -700,7 +705,7 @@ fhandler_socket_unix::create_pipe_instance ()
ULONG max_instances;
LARGE_INTEGER timeout;
status = npfs_handle (npfsh, NPFS_DIR);
status = npfs_handle (npfsh);
if (!NT_SUCCESS (status))
{
__seterrno_from_nt_status (status);
@ -738,7 +743,7 @@ fhandler_socket_unix::open_pipe (HANDLE &ph, PUNICODE_STRING pipe_name)
IO_STATUS_BLOCK io;
ULONG sharing;
status = npfs_handle (npfsh, NPFS_DIR);
status = npfs_handle (npfsh);
if (!NT_SUCCESS (status))
return status;
access = GENERIC_READ | GENERIC_WRITE | SYNCHRONIZE;
@ -996,7 +1001,7 @@ fhandler_socket_unix::wait_pipe_thread (PUNICODE_STRING pipe_name)
LONGLONG stamp;
HANDLE ph = NULL;
status = npfs_handle (npfsh, NPFS_DEVICE);
status = npfs_handle (npfsh);
if (!NT_SUCCESS (status))
{
error = geterrno_from_nt_status (status);

3
winsup/cygwin/globals.cc
View File

@ -149,8 +149,7 @@ const int __collate_load_error = 0;
extern UNICODE_STRING _RDATA ro_u_natdir = _ROU (L"Directory");
extern UNICODE_STRING _RDATA ro_u_natsyml = _ROU (L"SymbolicLink");
extern UNICODE_STRING _RDATA ro_u_natdev = _ROU (L"Device");
extern UNICODE_STRING _RDATA ro_u_npfs = _ROU (L"\\Device\\NamedPipe");
extern UNICODE_STRING _RDATA ro_u_npfs_dir = _ROU (L"\\Device\\NamedPipe\\");
extern UNICODE_STRING _RDATA ro_u_npfs = _ROU (L"\\Device\\NamedPipe\\");
#undef _ROU
/* This is an exported copy of environ which can be used by DLLs