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* fhandler.cc (fhandler_base::read): Remove unused signal state tweaks.

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* fhandler.h (fhandler_pipe::create_selectable): Declare.
(fhandler_fifo::close_one_end): Declare.
* fhandler_fifo.cc (fhandler_fifo::close_one_end): Define.
(fhandler_fifo::open_not_mine): Use close_one_end to close appropriate end of
pipe.
* pinfo.cc (_pinfo::commune_recv): Ditto.
* pipe.cc (fhandler_pipe::create_selectable): Rename from
create_selectable_pipe.  Reorganize.
(fhandler_pipe::create): Use create_selectable.
This commit is contained in:
Christopher Faylor
2005-04-22 13:58:09 +00:00
parent b13aa00489
commit fb201f9270
7 changed files with 76 additions and 79 deletions
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87
winsup/cygwin/pipe.cc
View File

@@ -318,21 +318,17 @@ leave:
FILE_READ_ATTRIBUTES access, on later versions of win32 where
this is supported. This access is needed by NtQueryInformationFile,
which is used to implement select and nonblocking writes.
Note that the return value is either NO_ERROR or GetLastError,
Note that the return value is either 0 or GetLastError,
unlike CreatePipe, which returns a bool for success or failure. */
static int
create_selectable_pipe (PHANDLE read_pipe_ptr,
PHANDLE write_pipe_ptr,
LPSECURITY_ATTRIBUTES sa_ptr,
DWORD psize)
int
fhandler_pipe::create_selectable (LPSECURITY_ATTRIBUTES sa_ptr, HANDLE& r,
HANDLE& w, DWORD psize, bool fifo)
{
/* Default to error. */
*read_pipe_ptr = *write_pipe_ptr = INVALID_HANDLE_VALUE;
HANDLE read_pipe = INVALID_HANDLE_VALUE, write_pipe = INVALID_HANDLE_VALUE;
r = w = INVALID_HANDLE_VALUE;
/* Ensure that there is enough pipe buffer space for atomic writes. */
if (psize < PIPE_BUF)
if (!fifo && psize < PIPE_BUF)
psize = PIPE_BUF;
char pipename[CYG_MAX_PATH];
@@ -342,9 +338,9 @@ create_selectable_pipe (PHANDLE read_pipe_ptr,
to be as robust as possible. */
while (1)
{
static volatile LONG pipe_unique_id;
static volatile ULONG pipe_unique_id;
__small_sprintf (pipename, "\\\\.\\pipe\\cygwin-%d-%ld", myself->pid,
__small_sprintf (pipename, "\\\\.\\pipe\\cygwin-%p-%p", myself->pid,
InterlockedIncrement ((LONG *) &pipe_unique_id));
debug_printf ("CreateNamedPipe: name %s, size %lu", pipename, psize);
@@ -358,84 +354,67 @@ create_selectable_pipe (PHANDLE read_pipe_ptr,
the pipe was not created earlier by some other process, even if
the pid has been reused. We avoid FILE_FLAG_FIRST_PIPE_INSTANCE
because that is only available for Win2k SP2 and WinXP. */
SetLastError (0);
read_pipe = CreateNamedPipe (pipename,
PIPE_ACCESS_INBOUND,
PIPE_TYPE_BYTE | PIPE_READMODE_BYTE,
1, /* max instances */
psize, /* output buffer size */
psize, /* input buffer size */
NMPWAIT_USE_DEFAULT_WAIT,
sa_ptr);
r = CreateNamedPipe (pipename, PIPE_ACCESS_INBOUND,
PIPE_TYPE_BYTE | PIPE_READMODE_BYTE, 1, psize,
psize, NMPWAIT_USE_DEFAULT_WAIT, sa_ptr);
DWORD err = GetLastError ();
/* Win 95 seems to return NULL instead of INVALID_HANDLE_VALUE */
if ((read_pipe || !err) && read_pipe != INVALID_HANDLE_VALUE)
if (r && r != INVALID_HANDLE_VALUE)
{
debug_printf ("pipe read handle %p", read_pipe);
debug_printf ("pipe read handle %p", r);
break;
}
DWORD err = GetLastError ();
switch (err)
{
case ERROR_PIPE_BUSY:
/* The pipe is already open with compatible parameters.
Pick a new name and retry. */
debug_printf ("pipe busy, retrying");
continue;
break;
case ERROR_ACCESS_DENIED:
/* The pipe is already open with incompatible parameters.
Pick a new name and retry. */
debug_printf ("pipe access denied, retrying");
continue;
case ERROR_CALL_NOT_IMPLEMENTED:
/* We are on an older Win9x platform without named pipes.
Return an anonymous pipe as the best approximation. */
debug_printf ("CreateNamedPipe not implemented, resorting to "
"CreatePipe size %lu", psize);
if (CreatePipe (read_pipe_ptr, write_pipe_ptr, sa_ptr, psize))
break;
default:
/* CreateNamePipe failed. Maybe we are on an older Win9x platform without
named pipes. Return an anonymous pipe as the best approximation. */
debug_printf ("CreateNamedPipe failed, resorting to CreatePipe size %lu",
psize);
if (CreatePipe (&r, &w, sa_ptr, psize))
{
debug_printf ("pipe read handle %p", *read_pipe_ptr);
debug_printf ("pipe write handle %p", *write_pipe_ptr);
return NO_ERROR;
debug_printf ("pipe read handle %p", r);
debug_printf ("pipe write handle %p", w);
return 0;
}
err = GetLastError ();
debug_printf ("CreatePipe failed, %E");
return err;
default:
debug_printf ("CreateNamedPipe failed, %E");
return err;
}
/* NOTREACHED */
}
debug_printf ("CreateFile: name %s", pipename);
/* Open the named pipe for writing.
Be sure to permit FILE_READ_ATTRIBUTES access. */
write_pipe = CreateFile (pipename,
GENERIC_WRITE | FILE_READ_ATTRIBUTES,
0, /* share mode */
sa_ptr,
OPEN_EXISTING,
0, /* flags and attributes */
0); /* handle to template file */
w = CreateFile (pipename, GENERIC_WRITE | FILE_READ_ATTRIBUTES, 0, sa_ptr,
OPEN_EXISTING, 0, 0);
if (write_pipe == INVALID_HANDLE_VALUE)
if (!w || w == INVALID_HANDLE_VALUE)
{
/* Failure. */
DWORD err = GetLastError ();
debug_printf ("CreateFile failed, %E");
CloseHandle (read_pipe);
CloseHandle (r);
return err;
}
debug_printf ("pipe write handle %p", write_pipe);
debug_printf ("pipe write handle %p", w);
/* Success. */
*read_pipe_ptr = read_pipe;
*write_pipe_ptr = write_pipe;
return NO_ERROR;
return 0;
}
int
@@ -444,9 +423,9 @@ fhandler_pipe::create (fhandler_pipe *fhs[2], unsigned psize, int mode, bool fif
HANDLE r, w;
SECURITY_ATTRIBUTES *sa = (mode & O_NOINHERIT) ? &sec_none_nih : &sec_none;
int res = -1;
int ret;
if ((ret = create_selectable_pipe (&r, &w, sa, psize)) != NO_ERROR)
int ret = create_selectable (sa, r, w, psize, fifo);
if (ret)
__seterrno_from_win_error (ret);
else
{