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/* Function for handling the GLib event loop.
Copyright (C) 2009, 2010, 2011
Free Software Foundation, Inc.
This file is part of GNU Emacs.
GNU Emacs 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.
GNU Emacs 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 GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */
#include <config.h>
#if defined (USE_GTK) || defined (HAVE_GCONF)
#include <glib.h>
#include <errno.h>
#include <setjmp.h>
#include "xgselect.h"
static GPollFD *gfds;
static int gfds_size;
int
xg_select (int max_fds, SELECT_TYPE *rfds, SELECT_TYPE *wfds, SELECT_TYPE *efds,
EMACS_TIME *timeout)
{
SELECT_TYPE all_rfds, all_wfds;
EMACS_TIME tmo, *tmop = timeout;
GMainContext *context = g_main_context_default ();
int have_wfds = wfds != NULL;
int n_gfds = 0, our_tmo = 0, retval = 0, our_fds = 0;
int prio, i, nfds, tmo_in_millisec;
if (rfds) memcpy (&all_rfds, rfds, sizeof (all_rfds));
else FD_ZERO (&all_rfds);
if (wfds) memcpy (&all_wfds, wfds, sizeof (all_rfds));
else FD_ZERO (&all_wfds);
/* Update event sources in GLib. */
g_main_context_pending (context);
do {
if (n_gfds > gfds_size)
{
while (n_gfds > gfds_size)
gfds_size *= 2;
xfree (gfds);
gfds = xmalloc (sizeof (*gfds) * gfds_size);
}
n_gfds = g_main_context_query (context,
G_PRIORITY_LOW,
&tmo_in_millisec,
gfds,
gfds_size);
} while (n_gfds > gfds_size);
for (i = 0; i < n_gfds; ++i)
{
if (gfds[i].events & G_IO_IN)
{
FD_SET (gfds[i].fd, &all_rfds);
if (gfds[i].fd > max_fds) max_fds = gfds[i].fd;
}
if (gfds[i].events & G_IO_OUT)
{
FD_SET (gfds[i].fd, &all_wfds);
if (gfds[i].fd > max_fds) max_fds = gfds[i].fd;
have_wfds = 1;
}
}
if (tmo_in_millisec >= 0)
{
EMACS_SET_SECS_USECS (tmo, tmo_in_millisec/1000,
1000 * (tmo_in_millisec % 1000));
if (!timeout) our_tmo = 1;
else
{
EMACS_TIME difference;
EMACS_SUB_TIME (difference, tmo, *timeout);
if (EMACS_TIME_NEG_P (difference)) our_tmo = 1;
}
if (our_tmo) tmop = &tmo;
}
nfds = select (max_fds+1, &all_rfds, have_wfds ? &all_wfds : NULL,
efds, tmop);
if (nfds < 0)
retval = nfds;
else if (nfds > 0)
{
for (i = 0; i < max_fds+1; ++i)
{
if (FD_ISSET (i, &all_rfds))
{
if (rfds && FD_ISSET (i, rfds)) ++retval;
else ++our_fds;
}
else if (rfds)
FD_CLR (i, rfds);
if (have_wfds && FD_ISSET (i, &all_wfds))
{
if (wfds && FD_ISSET (i, wfds)) ++retval;
else ++our_fds;
}
else if (wfds)
FD_CLR (i, wfds);
if (efds && FD_ISSET (i, efds))
++retval;
}
}
if (our_fds > 0 || (nfds == 0 && our_tmo))
{
/* If Gtk+ is in use eventually gtk_main_iteration will be called,
unless retval is zero. */
#ifdef USE_GTK
if (retval == 0)
#endif
while (g_main_context_pending (context))
g_main_context_dispatch (context);
/* To not have to recalculate timeout, return like this. */
if (retval == 0)
{
retval = -1;
errno = EINTR;
}
}
return retval;
}
#endif /* defined (USE_GTK) || defined (HAVE_GCONF) */
void
xgselect_initialize (void)
{
#if defined (USE_GTK) || defined (HAVE_GCONF)
gfds_size = 128;
gfds = xmalloc (sizeof (*gfds)*gfds_size);
#endif /* defined (USE_GTK) || defined (HAVE_GCONF) */
}
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