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
|
/****************************************************************************
* *
* GNAT COMPILER COMPONENTS *
* *
* C T R L _ C *
* *
* C Implementation File *
* *
* Copyright (C) 2002-2019, Free Software Foundation, Inc. *
* *
* GNAT is free software; you can redistribute it and/or modify it under *
* terms of the GNU General Public License as published by the Free Soft- *
* ware Foundation; either version 3, or (at your option) any later ver- *
* sion. GNAT is distributed in the hope that it will be useful, but WITH- *
* OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY *
* or FITNESS FOR A PARTICULAR PURPOSE. *
* *
* As a special exception under Section 7 of GPL version 3, you are granted *
* additional permissions described in the GCC Runtime Library Exception, *
* version 3.1, as published by the Free Software Foundation. *
* *
* You should have received a copy of the GNU General Public License and *
* a copy of the GCC Runtime Library Exception along with this program; *
* see the files COPYING3 and COPYING.RUNTIME respectively. If not, see *
* <http://www.gnu.org/licenses/>. *
* *
* GNAT was originally developed by the GNAT team at New York University. *
* Extensive contributions were provided by Ada Core Technologies Inc. *
* *
****************************************************************************/
#ifndef IN_RTS
#include "config.h"
#include "system.h"
#endif
/* Services to intercept Ctrl-C */
/* __gnat_install_int_handler will install the specified handler.
If called for the first time, it will also save the original handler */
void __gnat_install_int_handler (void (*) (void));
/* __gnat_uninstall_int_handler will reinstall the original handler */
void __gnat_uninstall_int_handler (void);
/* POSIX implementation */
#if (defined (__unix__) || defined (_AIX) || defined (__APPLE__)) \
|| defined (VMS) && !defined (__vxworks)
#ifdef VMS
/* On VMS _gnat_handle_vms_condition gets control first, and it has to
resignal the Ctrl/C in order for sigaction to gain control and execute
the user handler routine, but in doing so propagates the condition
causing the program to terminate. So instead we install a dummy handler
routine and put the real user handler in a special global variable so
that __gnat_handle_vms_condition can declare an AST to asynchronously
execute the Ctrl/C user handler at some future time and allow
__gnat_handle_vms_condition to return and not be held up waiting for
the potentially unbounded time required to execute the Crtl/C handler. */
void
dummy_handler () {}
/* Lives in init.c. */
extern void (*__gnat_ctrl_c_handler) (void);
#endif
#include <signal.h>
void (*sigint_intercepted) (void) = 0;
struct sigaction original_act;
static void
__gnat_int_handler (int sig __attribute__ ((unused)))
{
if (sigint_intercepted != 0)
sigint_intercepted ();
}
/* Install handler and save original handler. */
void
__gnat_install_int_handler (void (*proc) (void))
{
struct sigaction act;
if (sigint_intercepted == 0)
{
act.sa_handler = __gnat_int_handler;
#if defined (__Lynx__) || defined (VMS) || defined(__DJGPP__)
/* LynxOS, VMS and DJGPP do not support SA_RESTART. */
act.sa_flags = 0;
#else
act.sa_flags = SA_RESTART;
#endif
sigemptyset (&act.sa_mask);
sigaction (SIGINT, &act, &original_act);
}
#ifdef VMS
sigint_intercepted = &dummy_handler;
__gnat_ctrl_c_handler = proc;
#else
sigint_intercepted = proc;
#endif
}
/* Restore original handler */
void
__gnat_uninstall_int_handler (void)
{
if (sigint_intercepted != 0)
{
sigaction (SIGINT, &original_act, 0);
sigint_intercepted = 0;
}
#ifdef VMS
if (__gnat_ctrl_c_handler)
__gnat_ctrl_c_handler = 0;
#endif
}
/* Windows implementation */
#elif defined (__MINGW32__)
#include "mingw32.h"
#include <windows.h>
void (*sigint_intercepted) (void) = NULL;
static BOOL WINAPI
__gnat_int_handler (DWORD dwCtrlType)
{
switch (dwCtrlType)
{
case CTRL_C_EVENT:
case CTRL_BREAK_EVENT:
if (sigint_intercepted != 0)
{
sigint_intercepted ();
return TRUE;
}
break;
case CTRL_CLOSE_EVENT:
case CTRL_LOGOFF_EVENT:
case CTRL_SHUTDOWN_EVENT:
break;
}
return FALSE;
}
void
__gnat_install_int_handler (void (*proc) (void))
{
if (sigint_intercepted == NULL)
SetConsoleCtrlHandler (__gnat_int_handler, TRUE);
sigint_intercepted = proc;
}
void
__gnat_uninstall_int_handler (void)
{
if (sigint_intercepted != NULL)
SetConsoleCtrlHandler (__gnat_int_handler, FALSE);
sigint_intercepted = NULL;
}
/* Default implementation: do nothing */
#else
void
__gnat_install_int_handler (void (*proc) (void) __attribute__ ((unused)))
{
}
void
__gnat_uninstall_int_handler (void)
{
}
#endif
|
