1 /*
2 * Copyright (C) 2000-2007 Carsten Haitzler, Geoff Harrison and various contributors
3 * Copyright (C) 2004-2021 Kim Woelders
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining a copy
6 * of this software and associated documentation files (the "Software"), to
7 * deal in the Software without restriction, including without limitation the
8 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
9 * sell copies of the Software, and to permit persons to whom the Software is
10 * furnished to do so, subject to the following conditions:
11 *
12 * The above copyright notice and this permission notice shall be included in
13 * all copies of the Software, its documentation and marketing & publicity
14 * materials, and acknowledgment shall be given in the documentation, materials
15 * and software packages that this Software was used.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
21 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
22 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
23 */
24 #include "config.h"
25
26 #include <sys/wait.h>
27 #include <signal.h>
28
29 #include "E.h"
30 #include "session.h"
31
32 static void
SignalHandler(int sig)33 SignalHandler(int sig)
34 {
35 static int loop_count = 0;
36 int status;
37
38 Mode.wm.in_signal_handler = 1;
39
40 if (EDebug(EDBUG_TYPE_SESSION))
41 Eprintf("%s: signal=%d\n", __func__, sig);
42
43 switch (sig)
44 {
45 case SIGHUP:
46 SessionExit(EEXIT_RESTART, NULL);
47 break;
48
49 default:
50 case SIGINT:
51 case SIGQUIT:
52 case SIGABRT:
53 case SIGTERM:
54 SessionExit(EEXIT_EXIT, NULL);
55 break;
56
57 case SIGPIPE:
58 case SIGALRM:
59 case SIGUSR1:
60 case SIGUSR2:
61 break;
62
63 case SIGILL:
64 Mode.wm.exit_now = 1;
65 Alert(_("Enlightenment performed an Illegal Instruction.\n" "\n"
66 "This most likely is due to you having installed an run a\n"
67 "binary of Enlightenment that was compiled for a make or model\n"
68 "of CPU not 100%% identical or compatible with yours. Please\n"
69 "either obtain the correct package for your system, or\n"
70 "re-compile Enlightenment and possibly any support libraries\n"
71 "that you got in binary format to run Enlightenment.\n"));
72 goto do_abort;
73
74 case SIGFPE:
75 Mode.wm.exit_now = 1;
76 Alert(_("Enlightenment caused a Floating Point Exception.\n" "\n"
77 "This means that Enlightenment or support library routines it calls\n"
78 "have performed an illegal mathematical operation (most likely\n"
79 "dividing a number by zero). This is most likely a bug. It is\n"
80 "recommended to restart now. If you wish to help fix this please\n"
81 "compile Enlightenment with debugging symbols in and run\n"
82 "Enlightenment under gdb so you can backtrace for where it died and\n"
83 "send in a useful bug report with backtrace information and variable\n"
84 "dumps etc.\n"));
85 goto do_abort;
86
87 case SIGSEGV:
88 Mode.wm.exit_now = 1;
89 Alert(_("Enlightenment caused Segment Violation (Segfault)\n" "\n"
90 "This means that Enlightenment or support library routines it calls\n"
91 "have accessed areas of your system's memory that they are not\n"
92 "allowed access to. This is most likely a bug. It is recommended to\n"
93 "restart now. If you wish to help fix this please compile\n"
94 "Enlightenment with debugging symbols in and run Enlightenment\n"
95 "under gdb so you can backtrace for where it died and send in a\n"
96 "useful bug report with backtrace information and variable\n"
97 "dumps etc.\n"));
98 goto do_abort;
99
100 case SIGBUS:
101 Mode.wm.exit_now = 1;
102 Alert(_("Enlightenment caused Bus Error.\n" "\n"
103 "It is suggested you check your hardware and OS installation.\n"
104 "It is highly unusual to cause Bus Errors on operational\n"
105 "hardware.\n"));
106 goto do_abort;
107
108 do_abort:
109 if (loop_count > 0)
110 abort();
111 loop_count++;
112 #if 0 /* Avoid X-ops? */
113 disp = NULL;
114 #endif
115 SessionExit(EEXIT_ERROR, NULL);
116 abort();
117 break;
118
119 case SIGCHLD:
120 while (waitpid(-1, &status, WNOHANG) > 0)
121 ;
122 break;
123 }
124
125 Mode.wm.in_signal_handler = 0;
126 }
127
128 static void
doSignalsSetup(int setup)129 doSignalsSetup(int setup)
130 {
131 static const int signals[] = {
132 SIGHUP, SIGINT, SIGQUIT, SIGILL, SIGABRT, SIGFPE, SIGSEGV, SIGPIPE,
133 SIGALRM, SIGTERM, SIGUSR1, SIGUSR2, SIGCHLD, SIGBUS
134 };
135 unsigned int i, sig;
136 struct sigaction sa;
137
138 /*
139 * We may be here after a fork/exec within in a signal handler.
140 * Therefore, lets just clear the blocked signals.
141 */
142 sigemptyset(&sa.sa_mask);
143 sigprocmask(SIG_SETMASK, &sa.sa_mask, (sigset_t *) NULL);
144
145 for (i = 0; i < E_ARRAY_SIZE(signals); i++)
146 {
147 sig = signals[i];
148 if (Mode.wm.coredump &&
149 (sig == SIGILL || sig == SIGFPE || sig == SIGSEGV || sig == SIGBUS))
150 continue;
151
152 if (setup)
153 {
154 sa.sa_handler = SignalHandler;
155 sa.sa_flags = (sig == SIGCHLD) ? SA_RESTART : 0;
156 }
157 else
158 {
159 sa.sa_handler = SIG_DFL;
160 sa.sa_flags = 0;
161 }
162 sigemptyset(&sa.sa_mask);
163 sigaction(sig, &sa, (struct sigaction *)0);
164 }
165 }
166
167 void
SignalsSetup(void)168 SignalsSetup(void)
169 {
170 /* This function will set up all the signal handlers for E */
171 doSignalsSetup(1);
172 }
173
174 void
SignalsRestore(void)175 SignalsRestore(void)
176 {
177 /* This function will restore all the signal handlers for E */
178 doSignalsSetup(0);
179 }
180