1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
|
/*
Simple DirectMedia Layer
Copyright (C) 1997-2019 Sam Lantinga <slouken@libsdl.org>
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
*/
#include "../SDL_internal.h"
#include "SDL_hints.h"
#include "SDL_assert.h"
/* General quit handling code for SDL */
#ifdef HAVE_SIGNAL_H
#include <signal.h>
#endif
#include "SDL_events.h"
#include "SDL_events_c.h"
static SDL_bool disable_signals = SDL_FALSE;
static SDL_bool send_quit_pending = SDL_FALSE;
#ifdef SDL_BACKGROUNDING_SIGNAL
static SDL_bool send_backgrounding_pending = SDL_FALSE;
#endif
#ifdef SDL_FOREGROUNDING_SIGNAL
static SDL_bool send_foregrounding_pending = SDL_FALSE;
#endif
#ifdef HAVE_SIGNAL_H
static void
SDL_HandleSIG(int sig)
{
/* Reset the signal handler */
signal(sig, SDL_HandleSIG);
/* Send a quit event next time the event loop pumps. */
/* We can't send it in signal handler; malloc() might be interrupted! */
if ((sig == SIGINT) || (sig == SIGTERM)) {
send_quit_pending = SDL_TRUE;
}
#ifdef SDL_BACKGROUNDING_SIGNAL
else if (sig == SDL_BACKGROUNDING_SIGNAL) {
send_backgrounding_pending = SDL_TRUE;
}
#endif
#ifdef SDL_FOREGROUNDING_SIGNAL
else if (sig == SDL_FOREGROUNDING_SIGNAL) {
send_foregrounding_pending = SDL_TRUE;
}
#endif
}
#endif /* HAVE_SIGNAL_H */
static void
SDL_EventSignal_Init(const int sig)
{
#ifdef HAVE_SIGACTION
struct sigaction action;
sigaction(sig, NULL, &action);
#ifdef HAVE_SA_SIGACTION
if ( action.sa_handler == SIG_DFL && (void (*)(int))action.sa_sigaction == SIG_DFL ) {
#else
if ( action.sa_handler == SIG_DFL ) {
#endif
action.sa_handler = SDL_HandleSIG;
sigaction(sig, &action, NULL);
}
#elif HAVE_SIGNAL_H
void (*ohandler) (int) = signal(sig, SDL_HandleSIG);
if (ohandler != SIG_DFL) {
signal(sig, ohandler);
}
#endif
}
static void
SDL_EventSignal_Quit(const int sig)
{
#ifdef HAVE_SIGACTION
struct sigaction action;
sigaction(sig, NULL, &action);
if ( action.sa_handler == SDL_HandleSIG ) {
action.sa_handler = SIG_DFL;
sigaction(sig, &action, NULL);
}
#elif HAVE_SIGNAL_H
void (*ohandler) (int) = signal(sig, SIG_DFL);
if (ohandler != SDL_HandleSIG) {
signal(sig, ohandler);
}
#endif /* HAVE_SIGNAL_H */
}
/* Public functions */
static int
SDL_QuitInit_Internal(void)
{
/* Both SIGINT and SIGTERM are translated into quit interrupts */
/* and SDL can be built to simulate iOS/Android semantics with arbitrary signals. */
SDL_EventSignal_Init(SIGINT);
SDL_EventSignal_Init(SIGTERM);
#ifdef SDL_BACKGROUNDING_SIGNAL
SDL_EventSignal_Init(SDL_BACKGROUNDING_SIGNAL);
#endif
#ifdef SDL_FOREGROUNDING_SIGNAL
SDL_EventSignal_Init(SDL_FOREGROUNDING_SIGNAL);
#endif
/* That's it! */
return 0;
}
int
SDL_QuitInit(void)
{
if (!SDL_GetHintBoolean(SDL_HINT_NO_SIGNAL_HANDLERS, SDL_FALSE)) {
return SDL_QuitInit_Internal();
}
return 0;
}
static void
SDL_QuitQuit_Internal(void)
{
SDL_EventSignal_Quit(SIGINT);
SDL_EventSignal_Quit(SIGTERM);
#ifdef SDL_BACKGROUNDING_SIGNAL
SDL_EventSignal_Quit(SDL_BACKGROUNDING_SIGNAL);
#endif
#ifdef SDL_FOREGROUNDING_SIGNAL
SDL_EventSignal_Quit(SDL_FOREGROUNDING_SIGNAL);
#endif
}
void
SDL_QuitQuit(void)
{
if (!disable_signals) {
SDL_QuitQuit_Internal();
}
}
/* This function returns 1 if it's okay to close the application window */
int
SDL_SendQuit(void)
{
send_quit_pending = SDL_FALSE;
return SDL_SendAppEvent(SDL_QUIT);
}
void
SDL_SendPendingSignalEvents(void)
{
if (send_quit_pending) {
SDL_SendQuit();
SDL_assert(!send_quit_pending);
}
#ifdef SDL_BACKGROUNDING_SIGNAL
if (send_backgrounding_pending) {
send_backgrounding_pending = SDL_FALSE;
SDL_OnApplicationWillResignActive();
}
#endif
#ifdef SDL_FOREGROUNDING_SIGNAL
if (send_foregrounding_pending) {
send_foregrounding_pending = SDL_FALSE;
SDL_OnApplicationDidBecomeActive();
}
#endif
}
/* vi: set ts=4 sw=4 expandtab: */
|
