1 /*
2 Simple DirectMedia Layer
3 Copyright (C) 1997-2016 Sam Lantinga <slouken@libsdl.org>
4
5 This software is provided 'as-is', without any express or implied
6 warranty. In no event will the authors be held liable for any damages
7 arising from the use of this software.
8
9 Permission is granted to anyone to use this software for any purpose,
10 including commercial applications, and to alter it and redistribute it
11 freely, subject to the following restrictions:
12
13 1. The origin of this software must not be misrepresented; you must not
14 claim that you wrote the original software. If you use this software
15 in a product, an acknowledgment in the product documentation would be
16 appreciated but is not required.
17 2. Altered source versions must be plainly marked as such, and must not be
18 misrepresented as being the original software.
19 3. This notice may not be removed or altered from any source distribution.
20 */
21 #include "../SDL_internal.h"
22 #include "SDL_hints.h"
23 #include "SDL_assert.h"
24
25 /* General quit handling code for SDL */
26
27 #ifdef HAVE_SIGNAL_H
28 #include <signal.h>
29 #endif
30
31 #include "SDL_events.h"
32 #include "SDL_events_c.h"
33
34 static SDL_bool disable_signals = SDL_FALSE;
35 static SDL_bool send_quit_pending = SDL_FALSE;
36
37 #ifdef HAVE_SIGNAL_H
38 static void
SDL_HandleSIG(int sig)39 SDL_HandleSIG(int sig)
40 {
41 /* Reset the signal handler */
42 signal(sig, SDL_HandleSIG);
43
44 /* Send a quit event next time the event loop pumps. */
45 /* We can't send it in signal handler; malloc() might be interrupted! */
46 send_quit_pending = SDL_TRUE;
47 }
48 #endif /* HAVE_SIGNAL_H */
49
50 /* Public functions */
51 static int
SDL_QuitInit_Internal(void)52 SDL_QuitInit_Internal(void)
53 {
54 #ifdef HAVE_SIGACTION
55 struct sigaction action;
56 sigaction(SIGINT, NULL, &action);
57 #ifdef HAVE_SA_SIGACTION
58 if ( action.sa_handler == SIG_DFL && action.sa_sigaction == (void*)SIG_DFL ) {
59 #else
60 if ( action.sa_handler == SIG_DFL ) {
61 #endif
62 action.sa_handler = SDL_HandleSIG;
63 sigaction(SIGINT, &action, NULL);
64 }
65 sigaction(SIGTERM, NULL, &action);
66
67 #ifdef HAVE_SA_SIGACTION
68 if ( action.sa_handler == SIG_DFL && action.sa_sigaction == (void*)SIG_DFL ) {
69 #else
70 if ( action.sa_handler == SIG_DFL ) {
71 #endif
72 action.sa_handler = SDL_HandleSIG;
73 sigaction(SIGTERM, &action, NULL);
74 }
75 #elif HAVE_SIGNAL_H
76 void (*ohandler) (int);
77
78 /* Both SIGINT and SIGTERM are translated into quit interrupts */
79 ohandler = signal(SIGINT, SDL_HandleSIG);
80 if (ohandler != SIG_DFL)
81 signal(SIGINT, ohandler);
82 ohandler = signal(SIGTERM, SDL_HandleSIG);
83 if (ohandler != SIG_DFL)
84 signal(SIGTERM, ohandler);
85 #endif /* HAVE_SIGNAL_H */
86
87 /* That's it! */
88 return 0;
89 }
90
91 int
92 SDL_QuitInit(void)
93 {
94 if (!SDL_GetHintBoolean(SDL_HINT_NO_SIGNAL_HANDLERS, SDL_FALSE)) {
95 return SDL_QuitInit_Internal();
96 }
97 return 0;
98 }
99
100 static void
101 SDL_QuitQuit_Internal(void)
102 {
103 #ifdef HAVE_SIGACTION
104 struct sigaction action;
105 sigaction(SIGINT, NULL, &action);
106 if ( action.sa_handler == SDL_HandleSIG ) {
107 action.sa_handler = SIG_DFL;
108 sigaction(SIGINT, &action, NULL);
109 }
110 sigaction(SIGTERM, NULL, &action);
111 if ( action.sa_handler == SDL_HandleSIG ) {
112 action.sa_handler = SIG_DFL;
113 sigaction(SIGTERM, &action, NULL);
114 }
115 #elif HAVE_SIGNAL_H
116 void (*ohandler) (int);
117
118 ohandler = signal(SIGINT, SIG_DFL);
119 if (ohandler != SDL_HandleSIG)
120 signal(SIGINT, ohandler);
121 ohandler = signal(SIGTERM, SIG_DFL);
122 if (ohandler != SDL_HandleSIG)
123 signal(SIGTERM, ohandler);
124 #endif /* HAVE_SIGNAL_H */
125 }
126
127 void
128 SDL_QuitQuit(void)
129 {
130 if (!disable_signals) {
131 SDL_QuitQuit_Internal();
132 }
133 }
134
135 /* This function returns 1 if it's okay to close the application window */
136 int
137 SDL_SendQuit(void)
138 {
139 send_quit_pending = SDL_FALSE;
140 return SDL_SendAppEvent(SDL_QUIT);
141 }
142
143 void
144 SDL_SendPendingQuit(void)
145 {
146 if (send_quit_pending) {
147 SDL_SendQuit();
148 SDL_assert(!send_quit_pending);
149 }
150 }
151
152 /* vi: set ts=4 sw=4 expandtab: */
153