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/* Function for handling the GLib event loop.
Copyright (C) 2009-2014 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>
#include "xgselect.h"
#ifdef HAVE_GLIB
#include <glib.h>
#include <errno.h>
#include <timespec.h>
#include "frame.h"
int
xg_select (int fds_lim, fd_set *rfds, fd_set *wfds, fd_set *efds,
struct timespec const *timeout, sigset_t const *sigmask)
{
fd_set all_rfds, all_wfds;
struct timespec tmo;
struct timespec const *tmop = timeout;
GMainContext *context;
int have_wfds = wfds != NULL;
GPollFD gfds_buf[128];
GPollFD *gfds = gfds_buf;
int gfds_size = sizeof gfds_buf / sizeof *gfds_buf;
int n_gfds, retval = 0, our_fds = 0, max_fds = fds_lim - 1;
int i, nfds, tmo_in_millisec;
USE_SAFE_ALLOCA;
/* Do not try to optimize with an initial check with g_main_context_pending
and a call to pselect if it returns false. If Gdk has a timeout for 0.01
second, and Emacs has a timeout for 1 second, g_main_context_pending will
return false, but the timeout will be 1 second, thus missing the gdk
timeout with a lot. */
context = g_main_context_default ();
if (rfds) all_rfds = *rfds;
else FD_ZERO (&all_rfds);
if (wfds) all_wfds = *wfds;
else FD_ZERO (&all_wfds);
n_gfds = g_main_context_query (context, G_PRIORITY_LOW, &tmo_in_millisec,
gfds, gfds_size);
if (gfds_size < n_gfds)
{
SAFE_NALLOCA (gfds, sizeof *gfds, n_gfds);
gfds_size = n_gfds;
n_gfds = g_main_context_query (context, G_PRIORITY_LOW, &tmo_in_millisec,
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;
}
}
SAFE_FREE ();
if (tmo_in_millisec >= 0)
{
tmo = make_timespec (tmo_in_millisec / 1000,
1000 * 1000 * (tmo_in_millisec % 1000));
if (!timeout || timespec_cmp (tmo, *timeout) < 0)
tmop = &tmo;
}
fds_lim = max_fds + 1;
nfds = pselect (fds_lim, &all_rfds, have_wfds ? &all_wfds : NULL,
efds, tmop, sigmask);
if (nfds < 0)
retval = nfds;
else if (nfds > 0)
{
for (i = 0; i < fds_lim; ++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 && tmop == &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 /* HAVE_GLIB */
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