1 /****************************************************************************
3 * GNAT COMPILER COMPONENTS *
7 * C Implementation File *
9 * Copyright (C) 2002-2003, 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, 59 Temple Place - Suite 330, Boston, *
20 * MA 02111-1307, 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 static void __gnat_int_handler (int);
53 /* POSIX implementation */
55 #if (defined (_AIX) || defined (unix)) && !defined (__vxworks)
59 void (*sigint_intercepted) (void) = 0;
61 struct sigaction original_act;
64 __gnat_int_handler (int sig __attribute__ ((unused)))
66 if (sigint_intercepted != 0)
67 sigint_intercepted ();
70 /* Install handler and save original handler. */
73 __gnat_install_int_handler (void (*proc) (void))
77 if (sigint_intercepted == 0)
79 act.sa_handler = __gnat_int_handler;
80 act.sa_flags = SA_RESTART;
81 sigemptyset (&act.sa_mask);
82 sigaction (SIGINT, &act, &original_act);
85 sigint_intercepted = proc;
88 /* Restore original handler */
91 __gnat_uninstall_int_handler (void)
93 if (sigint_intercepted != 0)
95 sigaction (SIGINT, &original_act, 0);
96 sigint_intercepted = 0;
100 /* Windows implementation */
102 #elif defined (__MINGW32__)
107 void (*sigint_intercepted) () = NULL;
110 __gnat_int_handler (DWORD dwCtrlType)
115 case CTRL_BREAK_EVENT:
116 if (sigint_intercepted != 0)
117 sigint_intercepted ();
120 case CTRL_CLOSE_EVENT:
121 case CTRL_LOGOFF_EVENT:
122 case CTRL_SHUTDOWN_EVENT:
128 __gnat_install_int_handler (void (*proc) (void))
130 if (sigint_intercepted == NULL)
131 SetConsoleCtrlHandler (__gnat_int_handler, TRUE);
133 sigint_intercepted = proc;
137 __gnat_uninstall_int_handler ()
139 if (sigint_intercepted != NULL)
140 SetConsoleCtrlHandler (__gnat_int_handler, FALSE);
142 sigint_intercepted = NULL;
145 /* Default implementation: do nothing */
150 __gnat_install_int_handler (void (*proc) (void) __attribute__ ((unused)))
155 __gnat_uninstall_int_handler ()