Atlas - SDL_quit.c
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[FILE BEGIN]
1/*
2  Simple DirectMedia Layer
3  Copyright (C) 1997-2018 Sam Lantinga <[email protected]>
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
34static SDL_bool disable_signals = SDL_FALSE;
35static SDL_bool send_quit_pending = SDL_FALSE;
36
37#ifdef HAVE_SIGNAL_H
38static void
39SDL_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 */
51static int
52SDL_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 && (void (*)(int))action.sa_sigaction == 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 && (void (*)(int))action.sa_sigaction == 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
91int
92SDL_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
100static void
101SDL_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
127void
128SDL_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 */
136int
137SDL_SendQuit(void)
138{
139    send_quit_pending = SDL_FALSE;
140    return SDL_SendAppEvent(SDL_QUIT);
141}
142
143void
144SDL_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
[FILE END]
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