1 /****************************************************************************
3 * GNAT COMPILER COMPONENTS *
7 * C Implementation File *
9 * Copyright (C) 2002-2008, Free Software Foundation, Inc. *
11 * GNAT is free software; you can redistribute it and/or modify it under *
12 * terms of the GNU General Public License as published by the Free Soft- *
13 * ware Foundation; either version 2, or (at your option) any later ver- *
14 * sion. GNAT is distributed in the hope that it will be useful, but WITH- *
15 * OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY *
16 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License *
17 * for more details. You should have received a copy of the GNU General *
18 * Public License distributed with GNAT; see file COPYING. If not, write *
19 * to the Free Software Foundation, 51 Franklin Street, Fifth Floor, *
20 * Boston, MA 02110-1301, USA. *
22 * As a special exception, if you link this file with other files to *
23 * produce an executable, this file does not by itself cause the resulting *
24 * executable to be covered by the GNU General Public License. This except- *
25 * ion does not however invalidate any other reasons why the executable *
26 * file might be covered by the GNU Public License. *
28 * GNAT was originally developed by the GNAT team at New York University. *
29 * Extensive contributions were provided by Ada Core Technologies Inc. *
31 ****************************************************************************/
42 /* Services to intercept Ctrl-C */
44 /* __gnat_install_int_handler will install the specified handler.
45 If called for the first time, it will also save the original handler */
46 void __gnat_install_int_handler (void (*) (void));
48 /* __gnat_uninstall_int_handler will reinstall the original handler */
49 void __gnat_uninstall_int_handler (void);
51 /* POSIX implementation */
53 #if (defined (__unix__) || defined (_AIX) || defined (__APPLE__)) \
54 && !defined (__vxworks)
58 void (*sigint_intercepted
) (void) = 0;
60 struct sigaction original_act
;
63 __gnat_int_handler (int sig
__attribute__ ((unused
)))
65 if (sigint_intercepted
!= 0)
66 sigint_intercepted ();
69 /* Install handler and save original handler. */
72 __gnat_install_int_handler (void (*proc
) (void))
76 if (sigint_intercepted
== 0)
78 act
.sa_handler
= __gnat_int_handler
;
79 #if defined (__Lynx__)
80 /* LynxOS does not support SA_RESTART. */
83 act
.sa_flags
= SA_RESTART
;
85 sigemptyset (&act
.sa_mask
);
86 sigaction (SIGINT
, &act
, &original_act
);
89 sigint_intercepted
= proc
;
92 /* Restore original handler */
95 __gnat_uninstall_int_handler (void)
97 if (sigint_intercepted
!= 0)
99 sigaction (SIGINT
, &original_act
, 0);
100 sigint_intercepted
= 0;
104 /* Windows implementation */
106 #elif defined (__MINGW32__)
111 void (*sigint_intercepted
) (void) = NULL
;
114 __gnat_int_handler (DWORD dwCtrlType
)
119 case CTRL_BREAK_EVENT
:
120 if (sigint_intercepted
!= 0)
122 sigint_intercepted ();
127 case CTRL_CLOSE_EVENT
:
128 case CTRL_LOGOFF_EVENT
:
129 case CTRL_SHUTDOWN_EVENT
:
137 __gnat_install_int_handler (void (*proc
) (void))
139 if (sigint_intercepted
== NULL
)
140 SetConsoleCtrlHandler (__gnat_int_handler
, TRUE
);
142 sigint_intercepted
= proc
;
146 __gnat_uninstall_int_handler (void)
148 if (sigint_intercepted
!= NULL
)
149 SetConsoleCtrlHandler (__gnat_int_handler
, FALSE
);
151 sigint_intercepted
= NULL
;
154 /* Default implementation: do nothing */
159 __gnat_install_int_handler (void (*proc
) (void) __attribute__ ((unused
)))
164 __gnat_uninstall_int_handler (void)