Commit | Line | Data |
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872870b2 | 1 | /* Function for handling the GLib event loop. |
95df8112 | 2 | |
acaf905b | 3 | Copyright (C) 2009-2012 Free Software Foundation, Inc. |
872870b2 JD |
4 | |
5 | This file is part of GNU Emacs. | |
6 | ||
7 | GNU Emacs is free software: you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation, either version 3 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | GNU Emacs is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
0949d2b6 | 18 | along with GNU Emacs. If not, see <http§://www.gnu.org/licenses/>. */ |
872870b2 | 19 | |
08a494a3 | 20 | #include <config.h> |
872870b2 | 21 | |
aefd87e1 PE |
22 | #include <setjmp.h> |
23 | #include "xgselect.h" | |
24 | ||
0949d2b6 | 25 | #if defined (USE_GTK) || defined (HAVE_GCONF) || defined (HAVE_GSETTINGS) |
aefd87e1 | 26 | |
872870b2 JD |
27 | #include <glib.h> |
28 | #include <errno.h> | |
29 | #include <setjmp.h> | |
872870b2 JD |
30 | |
31 | static GPollFD *gfds; | |
0065d054 | 32 | static ptrdiff_t gfds_size; |
872870b2 JD |
33 | |
34 | int | |
e5447b22 JB |
35 | xg_select (int max_fds, SELECT_TYPE *rfds, SELECT_TYPE *wfds, SELECT_TYPE *efds, |
36 | EMACS_TIME *timeout) | |
872870b2 JD |
37 | { |
38 | SELECT_TYPE all_rfds, all_wfds; | |
39 | EMACS_TIME tmo, *tmop = timeout; | |
40 | ||
41 | GMainContext *context = g_main_context_default (); | |
42 | int have_wfds = wfds != NULL; | |
43 | int n_gfds = 0, our_tmo = 0, retval = 0, our_fds = 0; | |
41729b81 | 44 | int i, nfds, tmo_in_millisec; |
872870b2 JD |
45 | |
46 | if (rfds) memcpy (&all_rfds, rfds, sizeof (all_rfds)); | |
47 | else FD_ZERO (&all_rfds); | |
48 | if (wfds) memcpy (&all_wfds, wfds, sizeof (all_rfds)); | |
49 | else FD_ZERO (&all_wfds); | |
50 | ||
51 | /* Update event sources in GLib. */ | |
52 | g_main_context_pending (context); | |
53 | ||
54 | do { | |
41729b81 | 55 | if (n_gfds > gfds_size) |
872870b2 | 56 | { |
872870b2 | 57 | xfree (gfds); |
0065d054 PE |
58 | gfds = xpalloc (0, &gfds_size, n_gfds - gfds_size, INT_MAX, |
59 | sizeof *gfds); | |
872870b2 JD |
60 | } |
61 | ||
62 | n_gfds = g_main_context_query (context, | |
63 | G_PRIORITY_LOW, | |
64 | &tmo_in_millisec, | |
65 | gfds, | |
66 | gfds_size); | |
67 | } while (n_gfds > gfds_size); | |
68 | ||
41729b81 | 69 | for (i = 0; i < n_gfds; ++i) |
872870b2 JD |
70 | { |
71 | if (gfds[i].events & G_IO_IN) | |
72 | { | |
73 | FD_SET (gfds[i].fd, &all_rfds); | |
74 | if (gfds[i].fd > max_fds) max_fds = gfds[i].fd; | |
75 | } | |
76 | if (gfds[i].events & G_IO_OUT) | |
77 | { | |
78 | FD_SET (gfds[i].fd, &all_wfds); | |
79 | if (gfds[i].fd > max_fds) max_fds = gfds[i].fd; | |
80 | have_wfds = 1; | |
81 | } | |
82 | } | |
83 | ||
84 | if (tmo_in_millisec >= 0) | |
85 | { | |
86 | EMACS_SET_SECS_USECS (tmo, tmo_in_millisec/1000, | |
87 | 1000 * (tmo_in_millisec % 1000)); | |
88 | if (!timeout) our_tmo = 1; | |
89 | else | |
90 | { | |
91 | EMACS_TIME difference; | |
41729b81 | 92 | |
872870b2 JD |
93 | EMACS_SUB_TIME (difference, tmo, *timeout); |
94 | if (EMACS_TIME_NEG_P (difference)) our_tmo = 1; | |
95 | } | |
96 | ||
97 | if (our_tmo) tmop = &tmo; | |
98 | } | |
99 | ||
100 | nfds = select (max_fds+1, &all_rfds, have_wfds ? &all_wfds : NULL, | |
101 | efds, tmop); | |
102 | ||
103 | if (nfds < 0) | |
104 | retval = nfds; | |
41729b81 | 105 | else if (nfds > 0) |
872870b2 JD |
106 | { |
107 | for (i = 0; i < max_fds+1; ++i) | |
108 | { | |
109 | if (FD_ISSET (i, &all_rfds)) | |
110 | { | |
111 | if (rfds && FD_ISSET (i, rfds)) ++retval; | |
112 | else ++our_fds; | |
113 | } | |
42d3022b J |
114 | else if (rfds) |
115 | FD_CLR (i, rfds); | |
116 | ||
872870b2 JD |
117 | if (have_wfds && FD_ISSET (i, &all_wfds)) |
118 | { | |
119 | if (wfds && FD_ISSET (i, wfds)) ++retval; | |
120 | else ++our_fds; | |
121 | } | |
42d3022b J |
122 | else if (wfds) |
123 | FD_CLR (i, wfds); | |
124 | ||
872870b2 JD |
125 | if (efds && FD_ISSET (i, efds)) |
126 | ++retval; | |
127 | } | |
128 | } | |
129 | ||
130 | if (our_fds > 0 || (nfds == 0 && our_tmo)) | |
131 | { | |
41729b81 | 132 | |
872870b2 JD |
133 | /* If Gtk+ is in use eventually gtk_main_iteration will be called, |
134 | unless retval is zero. */ | |
135 | #ifdef USE_GTK | |
136 | if (retval == 0) | |
137 | #endif | |
138 | while (g_main_context_pending (context)) | |
139 | g_main_context_dispatch (context); | |
140 | ||
141 | /* To not have to recalculate timeout, return like this. */ | |
41729b81 | 142 | if (retval == 0) |
872870b2 JD |
143 | { |
144 | retval = -1; | |
145 | errno = EINTR; | |
146 | } | |
147 | } | |
148 | ||
149 | return retval; | |
150 | } | |
0949d2b6 | 151 | #endif /* USE_GTK || HAVE_GCONF || HAVE_GSETTINGS */ |
872870b2 JD |
152 | |
153 | void | |
971de7fb | 154 | xgselect_initialize (void) |
872870b2 | 155 | { |
0949d2b6 | 156 | #if defined (USE_GTK) || defined (HAVE_GCONF) || defined (HAVE_GSETTINGS) |
872870b2 JD |
157 | gfds_size = 128; |
158 | gfds = xmalloc (sizeof (*gfds)*gfds_size); | |
0949d2b6 | 159 | #endif |
872870b2 | 160 | } |