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/* Host support routines for MinGW, for GDB, the GNU debugger.

   Copyright (C) 2006, 2007, 2008 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 3 of the License, or

   (at your option) any later version.

   This program is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

   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, 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>

/* The strerror() function can return NULL for errno values that are

   out of range.  Provide a "safe" version that always returns a

   printable string.

   The Windows runtime implementation of strerror never returns NULL,

   but does return a useless string for anything above sys_nerr;

   unfortunately this includes all socket-related error codes.

   This replacement tries to find a system-provided error message.  */

char *

safe_strerror (int errnum)

{

  static char *buffer;

  int len;

  if (errnum >= 0 && errnum < sys_nerr)

    return strerror (errnum);

  if (buffer)

    {

      LocalFree (buffer);

      buffer = NULL;

    }

  if (FormatMessage (FORMAT_MESSAGE_ALLOCATE_BUFFER

                     | FORMAT_MESSAGE_FROM_SYSTEM,

                     NULL, errnum,

                     MAKELANGID (LANG_NEUTRAL, SUBLANG_DEFAULT),

                     (LPTSTR) &buffer, 0, NULL) == 0)

    {

      static char buf[32];

      xsnprintf (buf, sizeof buf, "(undocumented errno %d)", errnum);

      return buf;

    }

  /* Windows error messages end with a period and a CR-LF; strip that

     out.  */

  len = strlen (buffer);

  if (len > 3 && strcmp (buffer + len - 3, ".\r\n") == 0)

    buffer[len - 3] = '\0';

  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;

}