SDL  2.0
SDL_quit.c
Go to the documentation of this file.
1 /*
2  Simple DirectMedia Layer
3  Copyright (C) 1997-2020 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 #if defined(HAVE_SIGNAL_H) || defined(HAVE_SIGACTION)
35 #define HAVE_SIGNAL_SUPPORT 1
36 #endif
37 
38 #ifdef HAVE_SIGNAL_SUPPORT
41 
42 #ifdef SDL_BACKGROUNDING_SIGNAL
43 static SDL_bool send_backgrounding_pending = SDL_FALSE;
44 #endif
45 
46 #ifdef SDL_FOREGROUNDING_SIGNAL
47 static SDL_bool send_foregrounding_pending = SDL_FALSE;
48 #endif
49 
50 static void
51 SDL_HandleSIG(int sig)
52 {
53  /* Reset the signal handler */
54  signal(sig, SDL_HandleSIG);
55 
56  /* Send a quit event next time the event loop pumps. */
57  /* We can't send it in signal handler; malloc() might be interrupted! */
58  if ((sig == SIGINT) || (sig == SIGTERM)) {
60  }
61 
62  #ifdef SDL_BACKGROUNDING_SIGNAL
63  else if (sig == SDL_BACKGROUNDING_SIGNAL) {
64  send_backgrounding_pending = SDL_TRUE;
65  }
66  #endif
67 
68  #ifdef SDL_FOREGROUNDING_SIGNAL
69  else if (sig == SDL_FOREGROUNDING_SIGNAL) {
70  send_foregrounding_pending = SDL_TRUE;
71  }
72  #endif
73 }
74 
75 static void
76 SDL_EventSignal_Init(const int sig)
77 {
78 #ifdef HAVE_SIGACTION
79  struct sigaction action;
80 
81  sigaction(sig, NULL, &action);
82 #ifdef HAVE_SA_SIGACTION
83  if ( action.sa_handler == SIG_DFL && (void (*)(int))action.sa_sigaction == SIG_DFL ) {
84 #else
85  if ( action.sa_handler == SIG_DFL ) {
86 #endif
87  action.sa_handler = SDL_HandleSIG;
88  sigaction(sig, &action, NULL);
89  }
90 #elif HAVE_SIGNAL_H
91  void (*ohandler) (int) = signal(sig, SDL_HandleSIG);
92  if (ohandler != SIG_DFL) {
93  signal(sig, ohandler);
94  }
95 #endif
96 }
97 
98 static void
99 SDL_EventSignal_Quit(const int sig)
100 {
101 #ifdef HAVE_SIGACTION
102  struct sigaction action;
103  sigaction(sig, NULL, &action);
104  if ( action.sa_handler == SDL_HandleSIG ) {
105  action.sa_handler = SIG_DFL;
106  sigaction(sig, &action, NULL);
107  }
108 #elif HAVE_SIGNAL_H
109  void (*ohandler) (int) = signal(sig, SIG_DFL);
110  if (ohandler != SDL_HandleSIG) {
111  signal(sig, ohandler);
112  }
113 #endif /* HAVE_SIGNAL_H */
114 }
115 
116 /* Public functions */
117 static int
119 {
120  /* Both SIGINT and SIGTERM are translated into quit interrupts */
121  /* and SDL can be built to simulate iOS/Android semantics with arbitrary signals. */
122  SDL_EventSignal_Init(SIGINT);
123  SDL_EventSignal_Init(SIGTERM);
124 
125  #ifdef SDL_BACKGROUNDING_SIGNAL
126  SDL_EventSignal_Init(SDL_BACKGROUNDING_SIGNAL);
127  #endif
128 
129  #ifdef SDL_FOREGROUNDING_SIGNAL
130  SDL_EventSignal_Init(SDL_FOREGROUNDING_SIGNAL);
131  #endif
132 
133  /* That's it! */
134  return 0;
135 }
136 
137 static void
139 {
140  SDL_EventSignal_Quit(SIGINT);
141  SDL_EventSignal_Quit(SIGTERM);
142 
143  #ifdef SDL_BACKGROUNDING_SIGNAL
144  SDL_EventSignal_Quit(SDL_BACKGROUNDING_SIGNAL);
145  #endif
146 
147  #ifdef SDL_FOREGROUNDING_SIGNAL
148  SDL_EventSignal_Quit(SDL_FOREGROUNDING_SIGNAL);
149  #endif
150 }
151 #endif
152 
153 int
155 {
156 #ifdef HAVE_SIGNAL_SUPPORT
158  return SDL_QuitInit_Internal();
159  }
160 #endif
161  return 0;
162 }
163 
164 void
166 {
167 #ifdef HAVE_SIGNAL_SUPPORT
168  if (!disable_signals) {
170  }
171 #endif
172 }
173 
174 void
176 {
177 #ifdef HAVE_SIGNAL_SUPPORT
178  if (send_quit_pending) {
179  SDL_SendQuit();
181  }
182 
183  #ifdef SDL_BACKGROUNDING_SIGNAL
184  if (send_backgrounding_pending) {
185  send_backgrounding_pending = SDL_FALSE;
187  }
188  #endif
189 
190  #ifdef SDL_FOREGROUNDING_SIGNAL
191  if (send_foregrounding_pending) {
192  send_foregrounding_pending = SDL_FALSE;
194  }
195  #endif
196 #endif
197 }
198 
199 /* This function returns 1 if it's okay to close the application window */
200 int
202 {
203 #ifdef HAVE_SIGNAL_SUPPORT
205 #endif
206  return SDL_SendAppEvent(SDL_QUIT);
207 }
208 
209 /* vi: set ts=4 sw=4 expandtab: */
disable_signals
static SDL_bool disable_signals
Definition: SDL_quit.c:39
SDL_QuitQuit_Internal
static void SDL_QuitQuit_Internal(void)
Definition: SDL_quit.c:138
SDL_events.h
SDL_QuitQuit
void SDL_QuitQuit(void)
Definition: SDL_quit.c:165
NULL
#define NULL
Definition: begin_code.h:167
SDL_SendPendingSignalEvents
void SDL_SendPendingSignalEvents(void)
Definition: SDL_quit.c:175
SDL_HandleSIG
static void SDL_HandleSIG(int sig)
Definition: SDL_quit.c:51
SDL_EventSignal_Init
static void SDL_EventSignal_Init(const int sig)
Definition: SDL_quit.c:76
SDL_GetHintBoolean
#define SDL_GetHintBoolean
Definition: SDL_dynapi_overrides.h:608
SDL_QUIT
@ SDL_QUIT
Definition: SDL_events.h:60
SDL_assert.h
SDL_SendQuit
int SDL_SendQuit(void)
Definition: SDL_quit.c:201
SDL_TRUE
@ SDL_TRUE
Definition: SDL_stdinc.h:164
SDL_assert
#define SDL_assert(condition)
Definition: SDL_assert.h:169
SDL_EventSignal_Quit
static void SDL_EventSignal_Quit(const int sig)
Definition: SDL_quit.c:99
action
set set set set set set set set set set set set set set set set set set set set *set set set macro pixldst op &r &cond WK op &r &cond WK op &r &cond WK else op &m &cond &ia op &r &cond WK else op &m &cond &ia elseif elseif else error unsupported base if elseif elseif else error unsupported unaligned pixldst unaligned endm macro pixst base base else pixldst base endif endm macro PF base if bpp PF set rept prefetch_distance PF set OFFSET endr endif endm macro preload_leading_step2 base if bpp ifc DST PF PF else if bpp lsl PF PF lsl PF PF lsl PF PF PF else PF lsl PF lsl PF lsl PF endif SIZE macro preload_middle scratch_holds_offset if bpp if else PF PF endif endif endif endm macro preload_trailing base if bpp if bpp *pix_per_block PF PF lsl PF PF PF PF PF else PF lsl PF lsl PF PF PF PF PF base if bpp if narrow_case &&bpp<=dst_w_bpp) PF bic, WK0, base, #31 PF pld,[WK0] PF add, WK1, base, X, LSL #bpp_shift PF sub, WK1, WK1, #1 PF bic, WK1, WK1, #31 PF cmp, WK1, WK0 PF beq, 90f PF pld,[WK1]90:.else PF bic, WK0, base, #31 PF pld,[WK0] PF add, WK1, base, X, lsl #bpp_shift PF sub, WK1, WK1, #1 PF bic, WK1, WK1, #31 PF cmp, WK1, WK0 PF beq, 92f91:PF add, WK0, WK0, #32 PF cmp, WK0, WK1 PF pld,[WK0] PF bne, 91b92:.endif .endif.endm.macro conditional_process1_helper cond, process_head, process_tail, numbytes, firstreg, unaligned_src, unaligned_mask, decrementx process_head cond, numbytes, firstreg, unaligned_src, unaligned_mask, 0 .if decrementx sub &cond X, X, #8 *numbytes/dst_w_bpp .endif process_tail cond, numbytes, firstreg .if !((flags) &FLAG_PROCESS_DOES_STORE) pixst cond, numbytes, firstreg, DST .endif.endm.macro conditional_process1 cond, process_head, process_tail, numbytes, firstreg, unaligned_src, unaligned_mask, decrementx .if(flags) &FLAG_BRANCH_OVER .ifc cond, mi bpl 100f .endif .ifc cond, cs bcc 100f .endif .ifc cond, ne beq 100f .endif conditional_process1_helper, process_head, process_tail, numbytes, firstreg, unaligned_src, unaligned_mask, decrementx100:.else conditional_process1_helper cond, process_head, process_tail, numbytes, firstreg, unaligned_src, unaligned_mask, decrementx .endif.endm.macro conditional_process2 test, cond1, cond2, process_head, process_tail, numbytes1, numbytes2, firstreg1, firstreg2, unaligned_src, unaligned_mask, decrementx .if(flags) &(FLAG_DST_READWRITE|FLAG_BRANCH_OVER|FLAG_PROCESS_CORRUPTS_PSR|FLAG_PROCESS_DOES_STORE) test conditional_process1 cond1, process_head, process_tail, numbytes1, firstreg1, unaligned_src, unaligned_mask, decrementx .if(flags) &FLAG_PROCESS_CORRUPTS_PSR test .endif conditional_process1 cond2, process_head, process_tail, numbytes2, firstreg2, unaligned_src, unaligned_mask, decrementx .else test process_head cond1, numbytes1, firstreg1, unaligned_src, unaligned_mask, 0 process_head cond2, numbytes2, firstreg2, unaligned_src, unaligned_mask, 0 .if decrementx sub &cond1 X, X, #8 *numbytes1/dst_w_bpp sub &cond2 X, X, #8 *numbytes2/dst_w_bpp .endif process_tail cond1, numbytes1, firstreg1 process_tail cond2, numbytes2, firstreg2 pixst cond1, numbytes1, firstreg1, DST pixst cond2, numbytes2, firstreg2, DST .endif.endm.macro test_bits_1_0_ptr .if(flags) &FLAG_PROCESS_CORRUPTS_WK0 movs SCRATCH, X, lsl #32-1 .else movs SCRATCH, WK0, lsl #32-1 .endif.endm.macro test_bits_3_2_ptr .if(flags) &FLAG_PROCESS_CORRUPTS_WK0 movs SCRATCH, X, lsl #32-3 .else movs SCRATCH, WK0, lsl #32-3 .endif.endm.macro leading_15bytes process_head, process_tail .set DECREMENT_X, 1 .if(flags) &FLAG_PROCESS_CORRUPTS_WK0 .set DECREMENT_X, 0 sub X, X, WK0, lsr #dst_bpp_shift str X,[sp, #LINE_SAVED_REG_COUNT *4] mov X, WK0 .endif .if dst_w_bpp==8 conditional_process2 test_bits_1_0_ptr, mi, cs, process_head, process_tail, 1, 2, 1, 2, 1, 1, DECREMENT_X .elseif dst_w_bpp==16 test_bits_1_0_ptr conditional_process1 cs, process_head, process_tail, 2, 2, 1, 1, DECREMENT_X .endif conditional_process2 test_bits_3_2_ptr, mi, cs, process_head, process_tail, 4, 8, 1, 2, 1, 1, DECREMENT_X .if(flags) &FLAG_PROCESS_CORRUPTS_WK0 ldr X,[sp, #LINE_SAVED_REG_COUNT *4] .endif.endm.macro test_bits_3_2_pix movs SCRATCH, X, lsl #dst_bpp_shift+32-3.endm.macro test_bits_1_0_pix .if dst_w_bpp==8 movs SCRATCH, X, lsl #dst_bpp_shift+32-1 .else movs SCRATCH, X, lsr #1 .endif.endm.macro trailing_15bytes process_head, process_tail, unaligned_src, unaligned_mask conditional_process2 test_bits_3_2_pix, cs, mi, process_head, process_tail, 8, 4, 0, 2, unaligned_src, unaligned_mask, 0 .if dst_w_bpp==16 test_bits_1_0_pix conditional_process1 cs, process_head, process_tail, 2, 0, unaligned_src, unaligned_mask, 0 .elseif dst_w_bpp==8 conditional_process2 test_bits_1_0_pix, cs, mi, process_head, process_tail, 2, 1, 0, 1, unaligned_src, unaligned_mask, 0 .endif.endm.macro wide_case_inner_loop process_head, process_tail, unaligned_src, unaligned_mask, dst_alignment110:.set SUBBLOCK, 0 .rept pix_per_block *dst_w_bpp/128 process_head, 16, 0, unaligned_src, unaligned_mask, 1 .if(src_bpp > 0) &&(mask_bpp==0) &&((flags) &FLAG_PROCESS_PRESERVES_SCRATCH) preload_middle src_bpp, SRC, 1 .elseif(src_bpp==0) &&(mask_bpp > 0) &&((flags) &FLAG_PROCESS_PRESERVES_SCRATCH) preload_middle mask_bpp, MASK, 1 .else preload_middle src_bpp, SRC, 0 preload_middle mask_bpp, MASK, 0 .endif .if(dst_r_bpp > 0) &&((SUBBLOCK % 2)==0) &&(((flags) &FLAG_NO_PRELOAD_DST)==0) PF pld,[DST, #32 *prefetch_distance - dst_alignment] .endif process_tail, 16, 0 .if !((flags) &FLAG_PROCESS_DOES_STORE) pixst, 16, 0, DST .endif .set SUBBLOCK, SUBBLOCK+1 .endr subs X, X, #pix_per_block bhs 110b.endm.macro wide_case_inner_loop_and_trailing_pixels process_head, process_tail, process_inner_loop, exit_label, unaligned_src, unaligned_mask .if dst_r_bpp > tst bne process_inner_loop DST_PRELOAD_BIAS endif preload_trailing SRC preload_trailing MASK DST endif add medium_case_inner_loop_and_trailing_pixels unaligned_mask endm macro medium_case_inner_loop_and_trailing_pixels DST endif subs bhs tst beq exit_label trailing_15bytes unaligned_mask endm macro narrow_case_inner_loop_and_trailing_pixels unaligned_mask tst conditional_process1 trailing_15bytes unaligned_mask endm macro switch_on_alignment action
Definition: pixman-arm-simd-asm.h:510
SDL_HINT_NO_SIGNAL_HANDLERS
#define SDL_HINT_NO_SIGNAL_HANDLERS
Tell SDL not to catch the SIGINT or SIGTERM signals.
Definition: SDL_hints.h:1007
SDL_hints.h
SDL_QuitInit
int SDL_QuitInit(void)
Definition: SDL_quit.c:154
SDL_QuitInit_Internal
static int SDL_QuitInit_Internal(void)
Definition: SDL_quit.c:118
SDL_events_c.h
SDL_bool
SDL_bool
Definition: SDL_stdinc.h:162
SDL_OnApplicationWillResignActive
#define SDL_OnApplicationWillResignActive
Definition: SDL_dynapi_overrides.h:744
send_quit_pending
static SDL_bool send_quit_pending
Definition: SDL_quit.c:40
SDL_FALSE
@ SDL_FALSE
Definition: SDL_stdinc.h:163
void
SDL_PRINTF_FORMAT_STRING const char int SDL_PRINTF_FORMAT_STRING const char int SDL_PRINTF_FORMAT_STRING const char int SDL_PRINTF_FORMAT_STRING const char const char SDL_SCANF_FORMAT_STRING const char return SDL_ThreadFunction const char void return Uint32 return Uint32 void
Definition: SDL_dynapi_procs.h:89
SDL_SendAppEvent
int SDL_SendAppEvent(SDL_EventType eventType)
Definition: SDL_events.c:972
SDL_OnApplicationDidBecomeActive
#define SDL_OnApplicationDidBecomeActive
Definition: SDL_dynapi_overrides.h:747