/* Host support routines for MinGW, for GDB, the GNU debugger.
- Copyright (C) 2006
- Free Software Foundation, Inc.
+ Copyright (C) 2006, 2007 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
+ the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 51 Franklin Street, Fifth Floor,
- Boston, MA 02110-1301, USA. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
+#include "serial.h"
+#include "gdb_assert.h"
+#include "gdb_select.h"
#include "gdb_string.h"
#include <windows.h>
return buffer;
}
+
+/* Wrapper for select. On Windows systems, where the select interface
+ only works for sockets, this uses the GDB serial abstraction to
+ handle sockets, consoles, pipes, and serial ports.
+
+ The arguments to this function are the same as the traditional
+ arguments to select on POSIX platforms. */
+
+int
+gdb_select (int n, fd_set *readfds, fd_set *writefds, fd_set *exceptfds,
+ struct timeval *timeout)
+{
+ static HANDLE never_handle;
+ HANDLE handles[MAXIMUM_WAIT_OBJECTS];
+ HANDLE h;
+ DWORD event;
+ DWORD num_handles;
+ /* SCBS contains serial control objects corresponding to file
+ descriptors in READFDS and WRITEFDS. */
+ struct serial *scbs[MAXIMUM_WAIT_OBJECTS];
+ /* The number of valid entries in SCBS. */
+ size_t num_scbs;
+ int fd;
+ int num_ready;
+ size_t indx;
+
+ num_ready = 0;
+ num_handles = 0;
+ num_scbs = 0;
+ for (fd = 0; fd < n; ++fd)
+ {
+ HANDLE read = NULL, except = NULL;
+ struct serial *scb;
+
+ /* There is no support yet for WRITEFDS. At present, this isn't
+ used by GDB -- but we do not want to silently ignore WRITEFDS
+ if something starts using it. */
+ gdb_assert (!writefds || !FD_ISSET (fd, writefds));
+
+ if ((!readfds || !FD_ISSET (fd, readfds))
+ && (!exceptfds || !FD_ISSET (fd, exceptfds)))
+ continue;
+
+ scb = serial_for_fd (fd);
+ if (scb)
+ {
+ serial_wait_handle (scb, &read, &except);
+ scbs[num_scbs++] = scb;
+ }
+
+ if (read == NULL)
+ read = (HANDLE) _get_osfhandle (fd);
+ if (except == NULL)
+ {
+ if (!never_handle)
+ never_handle = CreateEvent (0, FALSE, FALSE, 0);
+
+ except = never_handle;
+ }
+
+ if (readfds && FD_ISSET (fd, readfds))
+ {
+ gdb_assert (num_handles < MAXIMUM_WAIT_OBJECTS);
+ handles[num_handles++] = read;
+ }
+
+ if (exceptfds && FD_ISSET (fd, exceptfds))
+ {
+ gdb_assert (num_handles < MAXIMUM_WAIT_OBJECTS);
+ handles[num_handles++] = except;
+ }
+ }
+ /* If we don't need to wait for any handles, we are done. */
+ if (!num_handles)
+ {
+ if (timeout)
+ Sleep (timeout->tv_sec * 1000 + timeout->tv_usec / 1000);
+
+ return 0;
+ }
+
+ event = WaitForMultipleObjects (num_handles,
+ handles,
+ FALSE,
+ timeout
+ ? (timeout->tv_sec * 1000
+ + timeout->tv_usec / 1000)
+ : INFINITE);
+ /* EVENT can only be a value in the WAIT_ABANDONED_0 range if the
+ HANDLES included an abandoned mutex. Since GDB doesn't use
+ mutexes, that should never occur. */
+ gdb_assert (!(WAIT_ABANDONED_0 <= event
+ && event < WAIT_ABANDONED_0 + num_handles));
+ /* We no longer need the helper threads to check for activity. */
+ for (indx = 0; indx < num_scbs; ++indx)
+ serial_done_wait_handle (scbs[indx]);
+ if (event == WAIT_FAILED)
+ return -1;
+ if (event == WAIT_TIMEOUT)
+ return 0;
+ /* Run through the READFDS, clearing bits corresponding to descriptors
+ for which input is unavailable. */
+ h = handles[event - WAIT_OBJECT_0];
+ for (fd = 0, indx = 0; fd < n; ++fd)
+ {
+ HANDLE fd_h;
+
+ if ((!readfds || !FD_ISSET (fd, readfds))
+ && (!exceptfds || !FD_ISSET (fd, exceptfds)))
+ continue;
+
+ if (readfds && FD_ISSET (fd, readfds))
+ {
+ fd_h = handles[indx++];
+ /* This handle might be ready, even though it wasn't the handle
+ returned by WaitForMultipleObjects. */
+ if (fd_h != h && WaitForSingleObject (fd_h, 0) != WAIT_OBJECT_0)
+ FD_CLR (fd, readfds);
+ else
+ num_ready++;
+ }
+
+ if (exceptfds && FD_ISSET (fd, exceptfds))
+ {
+ fd_h = handles[indx++];
+ /* This handle might be ready, even though it wasn't the handle
+ returned by WaitForMultipleObjects. */
+ if (fd_h != h && WaitForSingleObject (fd_h, 0) != WAIT_OBJECT_0)
+ FD_CLR (fd, exceptfds);
+ else
+ num_ready++;
+ }
+ }
+
+ return num_ready;
+}
projects / deliverable / binutils-gdb.git / blobdiff