* fhandler.h (fhandler_pipe::create_selectable): Remove optional argument, take
an options argument for CreateNamedPipe/CreateFile. Change handle arguments to expect pointers. (fhandler_fifo::fifo_state): Delete. (fhandler_fifo::dummy_client): Ditto. (fhandler_fifo::open_nonserver): Ditto. (fhandler_fifo::wait_state): Ditto. (fhandler_fifo::raw_write): Ditto. (fhandler_fifo::read_ready): New field. (fhandler_fifo::write_ready): Ditto. (fhandler_fifo::wait): Modify argument. (fhandler_fifo::fifo_name): Add a new argument. (fhandler_fifo::fixup_after_fork): New function. * fhandler_fifo.cc (fhandler_fifo::fhandler_fifo): Remove initialization of expunged elements. Initialize new handles to NULL. (fhandler_fifo::open_nonserver): Delete. (fnevent): New macro for creating a named event. (fnpipe): New macro for creating a unique named pipe name. (create_pipe): New macro for simplification of named pipe creation. (fhandler_fifo::fifo_name): Use new argument when creating a shared name. (fhandler_fifo::open): Rewrite. Use events to synchronize. (pure_debug_printf): New macro, active only when DEBUGGING. (fhandler_fifo::wait): Rewrite to wait for new fifo events which are supplied as a parameter. (fhandler_fifo::raw_read): Rewrite to use handle mechanism to detect client-side disconnect. (fhandler_fifo::raw_write): Delete. (fhandler_fifo::close): Remove accommodations for expunged fields. Close event handles. (fhandler_fifo::dup): Remove accommodations for expunged fields. Duplicate event handles. (fhandler_fifo::fixup_after_fork): New function. Perform fixups on event handles. (fhandler_fifo::set_close_on_exec): Remove accommodations for expunged fields. Set inheritance for new handle fields. * miscfuncs.cc (CreatePipeOverlapped): Accommodate changes in fhandler_pipe::create_selectable. * tty.cc (tty::not_allocated): Ditto. * pipe.cc (fhandler_pipe::create): Ditto. (fhandler_pipe::create_selectable): Accept an extra open_mode argument. Pass arguments by reference and allow opening one end of the pipe at a time. * sys/strace.h (debug_only_printf): Define new macro which calls debug_printf only when DEBUGGING is defined.
This commit is contained in:
Christopher Faylor
@@ -24,52 +24,27 @@
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#include "ntdll.h"
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fhandler_fifo::fhandler_fifo ():
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fhandler_base_overlapped (), wait_state (fifo_unknown), dummy_client (NULL)
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fhandler_base_overlapped (),
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read_ready (NULL), write_ready (NULL)
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{
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max_atomic_write = DEFAULT_PIPEBUFSIZE;
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need_fork_fixup (true);
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}
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HANDLE
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fhandler_fifo::open_nonserver (const char *npname, unsigned low_flags,
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LPSECURITY_ATTRIBUTES sa_buf)
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{
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DWORD mode = 0;
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if (low_flags == O_RDONLY)
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mode = GENERIC_READ;
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else if (low_flags == O_WRONLY)
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mode = GENERIC_WRITE;
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else
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mode = GENERIC_READ | GENERIC_WRITE;
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while (1)
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{
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HANDLE h = CreateFile (npname, mode, 0, sa_buf, OPEN_EXISTING,
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FILE_FLAG_OVERLAPPED, NULL);
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if (h != INVALID_HANDLE_VALUE || GetLastError () != ERROR_PIPE_NOT_CONNECTED)
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return h;
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if (IsEventSignalled (signal_arrived))
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{
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set_errno (EINTR);
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return NULL;
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}
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}
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}
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#define fnevent(w) fifo_name (npbuf, w "-event")
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#define fnpipe() fifo_name (npbuf, "fifo")
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#define create_pipe(r, w) \
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fhandler_pipe::create_selectable (sa_buf, (r), (w), 0, fnpipe (), open_mode)
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char *
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fhandler_fifo::fifo_name (char *buf)
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fhandler_fifo::fifo_name (char *buf, const char *what)
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{
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/* Generate a semi-unique name to associate with this fifo. */
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__small_sprintf (buf, "\\\\.\\pipe\\__cygfifo__%S_%08x_%016X",
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&installation_key, get_dev (), get_ino ());
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__small_sprintf (buf, "%s.%08x.%016X", what, get_dev (),
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get_ino ());
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return buf;
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}
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#define FIFO_PIPE_MODE (PIPE_TYPE_BYTE | PIPE_READMODE_BYTE)
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#define FIFO_BUF_SIZE 4096
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#define cnp(m, s) CreateNamedPipe(npname, (m), FIFO_PIPE_MODE, \
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PIPE_UNLIMITED_INSTANCES, (s), (s), \
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NMPWAIT_WAIT_FOREVER, sa_buf)
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inline PSECURITY_ATTRIBUTES
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sec_user_cloexec (bool cloexec, PSECURITY_ATTRIBUTES sa, PSID sid)
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{
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@@ -79,207 +54,242 @@ sec_user_cloexec (bool cloexec, PSECURITY_ATTRIBUTES sa, PSID sid)
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int
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fhandler_fifo::open (int flags, mode_t)
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{
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int res = 1;
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char npname[MAX_PATH];
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enum
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{
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success,
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error_errno_set,
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error_set_errno
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} res;
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bool reader, writer;
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DWORD open_mode = FILE_FLAG_OVERLAPPED;
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fifo_name (npname);
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unsigned low_flags = flags & O_ACCMODE;
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DWORD mode = 0;
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if (low_flags == O_WRONLY)
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mode = PIPE_ACCESS_OUTBOUND;
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else if (low_flags == O_RDONLY || low_flags == O_RDWR)
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mode = PIPE_ACCESS_DUPLEX;
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/* Determine what we're doing with this fhandler: reading, writing, both */
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switch (flags & O_ACCMODE)
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{
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case O_RDONLY:
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reader = true;
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writer = false;
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break;
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case O_WRONLY:
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writer = true;
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reader = false;
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break;
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case O_RDWR:
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reader = true;
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writer = true;
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open_mode |= PIPE_ACCESS_DUPLEX;
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break;
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default:
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set_errno (EINVAL);
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res = error_errno_set;
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goto out;
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}
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set_flags (flags);
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char char_sa_buf[1024];
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LPSECURITY_ATTRIBUTES sa_buf;
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sa_buf = sec_user_cloexec (flags & O_CLOEXEC, (PSECURITY_ATTRIBUTES) char_sa_buf,
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cygheap->user.sid());
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char npbuf[MAX_PATH];
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/* Create control events for this named pipe */
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if (!(read_ready = CreateEvent (sa_buf, true, false, fnevent ("r"))))
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{
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debug_printf ("CreatEvent for %s failed, %E", npbuf);
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res = error_set_errno;
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goto out;
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}
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if (!(write_ready = CreateEvent (sa_buf, true, false, fnevent ("w"))))
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{
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debug_printf ("CreatEvent for %s failed, %E", npbuf);
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res = error_set_errno;
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goto out;
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}
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/* If we're reading, create the pipe, signal that we're ready and wait for
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a writer.
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FIXME: Probably need to special case O_RDWR case. */
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if (!reader)
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/* We are not a reader */;
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else if (create_pipe (&get_io_handle (), NULL))
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{
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debug_printf ("create of reader failed");
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res = error_set_errno;
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goto out;
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}
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else if (!SetEvent (read_ready))
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{
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debug_printf ("SetEvent for read_ready failed, %E");
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res = error_set_errno;
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goto out;
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}
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else if (!writer && !wait (write_ready))
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{
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debug_printf ("wait for write_ready failed, %E");
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res = error_errno_set;
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goto out;
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}
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/* If we're writing, it's a little tricky since it is possible that
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we're attempting to open the other end of a pipe which is already
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connected. In that case, we detect ERROR_PIPE_BUSY, reset the
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read_ready event and wait for the reader to allow us to connect
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by signalling read_ready.
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Once the pipe has been set up, we signal write_ready. */
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if (writer)
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{
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int err;
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while (1)
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if (!wait (read_ready))
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{
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res = error_errno_set;
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goto out;
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}
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else if ((err = create_pipe (NULL, &get_io_handle ())) == 0)
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break;
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else if (err == ERROR_PIPE_BUSY)
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{
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debug_only_printf ("pipe busy");
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ResetEvent (read_ready);
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}
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else
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{
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debug_printf ("create of writer failed");
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res = error_set_errno;
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goto out;
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}
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if (!SetEvent (write_ready))
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{
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debug_printf ("SetEvent for write_ready failed, %E");
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res = error_set_errno;
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goto out;
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}
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}
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/* If setup_overlapped() succeeds (and why wouldn't it?) we are all set. */
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if (setup_overlapped () == 0)
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res = success;
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else
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{
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set_errno (EINVAL);
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res = 0;
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debug_printf ("setup_overlapped failed, %E");
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res = error_set_errno;
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}
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if (res)
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out:
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if (res == error_set_errno)
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__seterrno ();
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if (res != success)
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{
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char char_sa_buf[1024];
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LPSECURITY_ATTRIBUTES sa_buf =
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sec_user_cloexec (flags & O_CLOEXEC, (PSECURITY_ATTRIBUTES) char_sa_buf,
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cygheap->user.sid());
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bool do_seterrno = true;
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HANDLE h;
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bool nonblocking_write = !!((flags & (O_WRONLY | O_NONBLOCK)) == (O_WRONLY | O_NONBLOCK));
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wait_state = fifo_unknown;
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if (mode != PIPE_ACCESS_OUTBOUND)
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if (read_ready)
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{
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h = cnp (mode | FILE_FLAG_OVERLAPPED, FIFO_BUF_SIZE);
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wait_state = fifo_wait_for_client;
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CloseHandle (read_ready);
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read_ready = NULL;
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}
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else
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if (write_ready)
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{
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h = open_nonserver (npname, low_flags, sa_buf);
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if (h != INVALID_HANDLE_VALUE)
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wait_state = fifo_ok;
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else if (nonblocking_write)
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{
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set_errno (ENXIO);
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do_seterrno = false;
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}
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else if ((h = cnp (PIPE_ACCESS_DUPLEX, 1)) != INVALID_HANDLE_VALUE)
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{
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if ((dummy_client = open_nonserver (npname, low_flags, sa_buf))
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!= INVALID_HANDLE_VALUE)
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{
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wait_state = fifo_wait_for_server;
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ProtectHandle (dummy_client);
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}
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else
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{
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DWORD saveerr = GetLastError ();
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CloseHandle (h);
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h = INVALID_HANDLE_VALUE;
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SetLastError (saveerr);
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}
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}
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}
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if (h == INVALID_HANDLE_VALUE)
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{
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if (do_seterrno)
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__seterrno ();
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res = 0;
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}
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else if (setup_overlapped ())
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{
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CloseHandle (h);
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__seterrno ();
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res = 0;
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}
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else
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{
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set_io_handle (h);
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set_flags (flags);
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res = 1;
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CloseHandle (write_ready);
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write_ready = NULL;
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}
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if (get_io_handle ())
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CloseHandle (get_io_handle ());
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}
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debug_printf ("returning %d, errno %d", res, get_errno ());
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return res;
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debug_printf ("res %d", res);
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return res == success;
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}
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bool
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fhandler_fifo::wait (bool iswrite)
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fhandler_fifo::wait (HANDLE h)
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{
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DWORD ninstances;
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switch (wait_state)
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#ifdef DEBUGGING
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const char *what;
|
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if (h == read_ready)
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what = "reader";
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else if (h == write_ready)
|
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what = "writer";
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||||
else
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what = "overlapped event";
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||||
#endif
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HANDLE w4[3] = {h, signal_arrived, pthread::get_cancel_event ()};
|
||||
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||||
/* Set the wait to zero for non-blocking I/O-related events. */
|
||||
DWORD wait = ((h == read_ready || h == write_ready)
|
||||
&& get_flags () & O_NONBLOCK) ? 0 : INFINITE;
|
||||
|
||||
debug_only_printf ("waiting for %s", what);
|
||||
/* Wait for the event. Set errno, as appropriate if something goes wrong. */
|
||||
switch (WaitForMultipleObjects (3, w4, false, wait))
|
||||
{
|
||||
case fifo_wait_for_next_client:
|
||||
DisconnectNamedPipe (get_handle ());
|
||||
if (!GetNamedPipeHandleState (get_handle (), NULL, &ninstances, NULL, NULL, NULL, 0))
|
||||
case WAIT_OBJECT_0:
|
||||
debug_only_printf ("successfully waited for %s", what);
|
||||
return true;
|
||||
case WAIT_TIMEOUT:
|
||||
if (h == write_ready)
|
||||
{
|
||||
__seterrno ();
|
||||
wait_state = fifo_error;
|
||||
debug_only_printf ("wait timed out waiting for write but will still open reader since non-blocking mode");
|
||||
return true;
|
||||
}
|
||||
else
|
||||
{
|
||||
set_errno (ENXIO);
|
||||
return false;
|
||||
}
|
||||
if (ninstances <= 1)
|
||||
{
|
||||
wait_state = fifo_eof;
|
||||
return false;
|
||||
}
|
||||
case fifo_wait_for_client:
|
||||
{
|
||||
DWORD dummy_bytes;
|
||||
while (1)
|
||||
{
|
||||
int res = ConnectNamedPipe (get_handle (), get_overlapped ());
|
||||
if (GetLastError () != ERROR_NO_DATA && GetLastError () != ERROR_PIPE_CONNECTED)
|
||||
{
|
||||
res = wait_overlapped (res, iswrite, &dummy_bytes, false);
|
||||
if (!res)
|
||||
{
|
||||
if (get_errno () != EINTR)
|
||||
wait_state = fifo_error;
|
||||
else if (!_my_tls.call_signal_handler ())
|
||||
wait_state = fifo_eintr;
|
||||
else
|
||||
continue;
|
||||
return false;
|
||||
}
|
||||
}
|
||||
wait_state = fifo_ok;
|
||||
break;
|
||||
}
|
||||
}
|
||||
break;
|
||||
case fifo_wait_for_server:
|
||||
char npname[MAX_PATH];
|
||||
fifo_name (npname);
|
||||
char char_sa_buf[1024];
|
||||
LPSECURITY_ATTRIBUTES sa_buf;
|
||||
sa_buf = sec_user_cloexec (close_on_exec (),
|
||||
(PSECURITY_ATTRIBUTES) char_sa_buf,
|
||||
cygheap->user.sid());
|
||||
while (1)
|
||||
{
|
||||
if (WaitNamedPipe (npname, 10))
|
||||
/* connected, maybe */;
|
||||
else if (GetLastError () != ERROR_SEM_TIMEOUT)
|
||||
{
|
||||
__seterrno ();
|
||||
return false;
|
||||
}
|
||||
else if (!IsEventSignalled (signal_arrived))
|
||||
continue;
|
||||
else if (_my_tls.call_signal_handler ())
|
||||
continue;
|
||||
else
|
||||
{
|
||||
set_errno (EINTR);
|
||||
return false;
|
||||
}
|
||||
HANDLE h = open_nonserver (npname, get_flags () & O_ACCMODE, sa_buf);
|
||||
if (h != INVALID_HANDLE_VALUE)
|
||||
{
|
||||
ForceCloseHandle (get_handle ());
|
||||
ForceCloseHandle (dummy_client);
|
||||
dummy_client = NULL;
|
||||
wait_state = fifo_ok;
|
||||
set_io_handle (h);
|
||||
break;
|
||||
}
|
||||
if (GetLastError () == ERROR_PIPE_LISTENING)
|
||||
continue;
|
||||
else
|
||||
{
|
||||
__seterrno ();
|
||||
return false;
|
||||
}
|
||||
}
|
||||
case WAIT_OBJECT_0 + 1:
|
||||
debug_only_printf ("interrupted by signal while waiting for %s", what);
|
||||
set_errno (EINTR);
|
||||
return false;
|
||||
case WAIT_OBJECT_0 + 2:
|
||||
debug_only_printf ("cancellable interruption while waiting for %s", what);
|
||||
pthread::static_cancel_self (); /* never returns */
|
||||
break;
|
||||
default:
|
||||
break;
|
||||
}
|
||||
return true;
|
||||
debug_only_printf ("unknown error while waiting for %s", what);
|
||||
__seterrno ();
|
||||
return false;
|
||||
}
|
||||
}
|
||||
|
||||
void __stdcall
|
||||
fhandler_fifo::raw_read (void *in_ptr, size_t& len)
|
||||
{
|
||||
while (wait_state != fifo_eof && wait_state != fifo_error && wait_state != fifo_eintr)
|
||||
if (!wait (false))
|
||||
len = (wait_state == fifo_error || wait_state == fifo_eintr) ? (size_t) -1 : 0;
|
||||
else
|
||||
{
|
||||
size_t prev_len = len;
|
||||
fhandler_base_overlapped::raw_read (in_ptr, len);
|
||||
if (len)
|
||||
break;
|
||||
wait_state = fifo_wait_for_next_client;
|
||||
len = prev_len;
|
||||
}
|
||||
if (wait_state == fifo_eintr)
|
||||
wait_state = fifo_wait_for_client;
|
||||
debug_printf ("returning %d, mode %d, %E\n", len, get_errno ());
|
||||
}
|
||||
size_t orig_len = len;
|
||||
for (int i = 0; i < 2; i++)
|
||||
{
|
||||
fhandler_base_overlapped::raw_read (in_ptr, len);
|
||||
if (len || i || WaitForSingleObject (read_ready, 0) == WAIT_OBJECT_0)
|
||||
break;
|
||||
/* If we got here, then fhandler_base_overlapped::raw_read returned 0,
|
||||
indicating "EOF" and something has set read_ready to zero. That means
|
||||
we should have a client waiting to connect.
|
||||
FIXME: If the client CTRL-C's the open during this time then this
|
||||
could hang indefinitely. Maybe implement a timeout? */
|
||||
if (!DisconnectNamedPipe (get_io_handle ()))
|
||||
{
|
||||
debug_printf ("DisconnecttNamedPipe failed, %E");
|
||||
goto errno_out;
|
||||
}
|
||||
else if (!ConnectNamedPipe (get_io_handle (), get_overlapped ())
|
||||
&& GetLastError () != ERROR_IO_PENDING)
|
||||
{
|
||||
debug_printf ("ConnectNamedPipe failed, %E");
|
||||
goto errno_out;
|
||||
}
|
||||
else if (!SetEvent (read_ready))
|
||||
{
|
||||
debug_printf ("SetEvent (read_ready) failed, %E");
|
||||
goto errno_out;
|
||||
}
|
||||
else if (!wait (get_overlapped_buffer ()->hEvent))
|
||||
goto errout; /* If wait() fails, errno is set so no need to set it */
|
||||
len = orig_len; /* Reset since raw_read above set it to zero. */
|
||||
}
|
||||
return;
|
||||
|
||||
ssize_t __stdcall
|
||||
fhandler_fifo::raw_write (const void *ptr, size_t len)
|
||||
{
|
||||
return wait (true) ? fhandler_base_overlapped::raw_write (ptr, len) : -1;
|
||||
errno_out:
|
||||
__seterrno ();
|
||||
errout:
|
||||
len = -1;
|
||||
}
|
||||
|
||||
int __stdcall
|
||||
@@ -293,41 +303,52 @@ fhandler_fifo::fstatvfs (struct statvfs *sfs)
|
||||
int
|
||||
fhandler_fifo::close ()
|
||||
{
|
||||
wait_state = fifo_eof;
|
||||
if (dummy_client)
|
||||
{
|
||||
ForceCloseHandle (dummy_client);
|
||||
dummy_client = NULL;
|
||||
}
|
||||
CloseHandle (read_ready);
|
||||
CloseHandle (write_ready);
|
||||
return fhandler_base::close ();
|
||||
}
|
||||
|
||||
int
|
||||
fhandler_fifo::dup (fhandler_base *child, int flags)
|
||||
{
|
||||
int res = fhandler_base_overlapped::dup (child, flags);
|
||||
fhandler_fifo *fifo_child = (fhandler_fifo *) child;
|
||||
if (res == 0 && dummy_client)
|
||||
if (fhandler_base_overlapped::dup (child, flags))
|
||||
{
|
||||
bool dres = DuplicateHandle (GetCurrentProcess (), dummy_client,
|
||||
GetCurrentProcess (),
|
||||
&fifo_child->dummy_client, 0,
|
||||
TRUE, DUPLICATE_SAME_ACCESS);
|
||||
if (!dres)
|
||||
{
|
||||
fifo_child->dummy_client = NULL;
|
||||
child->close ();
|
||||
__seterrno ();
|
||||
res = -1;
|
||||
}
|
||||
__seterrno ();
|
||||
return -1;
|
||||
}
|
||||
return res;
|
||||
fhandler_fifo *fhf = (fhandler_fifo *) child;
|
||||
if (!DuplicateHandle (GetCurrentProcess (), read_ready,
|
||||
GetCurrentProcess (), &fhf->read_ready,
|
||||
0, true, DUPLICATE_SAME_ACCESS))
|
||||
{
|
||||
fhf->close ();
|
||||
__seterrno ();
|
||||
return -1;
|
||||
}
|
||||
if (!DuplicateHandle (GetCurrentProcess (), write_ready,
|
||||
GetCurrentProcess (), &fhf->write_ready,
|
||||
0, true, DUPLICATE_SAME_ACCESS))
|
||||
{
|
||||
CloseHandle (fhf->read_ready);
|
||||
fhf->close ();
|
||||
__seterrno ();
|
||||
return -1;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
void
|
||||
fhandler_fifo::fixup_after_fork (HANDLE parent)
|
||||
{
|
||||
fhandler_base_overlapped::fixup_after_fork (parent);
|
||||
fork_fixup (parent, read_ready, "read_ready");
|
||||
fork_fixup (parent, write_ready, "write_ready");
|
||||
}
|
||||
|
||||
void
|
||||
fhandler_fifo::set_close_on_exec (bool val)
|
||||
{
|
||||
fhandler_base::set_close_on_exec (val);
|
||||
if (dummy_client)
|
||||
set_no_inheritance (dummy_client, val);
|
||||
set_no_inheritance (read_ready, val);
|
||||
set_no_inheritance (write_ready, val);
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user