1 /* This testcase is part of GDB, the GNU debugger.
3 Copyright 2004, 2007-2012 Free Software Foundation, Inc.
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 3 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>. */
24 enum level
{ MAIN
, OUTER
, INNER
, LEAF
, NR_LEVELS
};
26 /* Levels completed flag. */
27 volatile enum level level
= NR_LEVELS
;
29 void catcher (int signal
);
32 thrower (enum level next_level
, int sig
, int itimer
, int on_stack
)
35 /* Set up the signal handler. */
38 memset (&act
, 0, sizeof (act
));
39 act
.sa_handler
= catcher
;
40 act
.sa_flags
|= on_stack
;
41 sigaction (sig
, &act
, NULL
);
43 /* Set up a one-off timer. A timer, rather than SIGSEGV, is used as
44 after a timer handler finishes the interrupted code can safely
47 struct itimerval itime
;
48 memset (&itime
, 0, sizeof (itime
));
49 itime
.it_value
.tv_usec
= 250 * 1000;
50 setitimer (itimer
, &itime
, NULL
);
53 while (level
!= LEAF
);
59 /* Find the next level. */
63 thrower (OUTER
, SIGALRM
, ITIMER_REAL
, SA_ONSTACK
);
66 thrower (INNER
, SIGVTALRM
, ITIMER_VIRTUAL
, SA_ONSTACK
);
77 /* Set up the altstack. */
79 static char stack
[SIGSTKSZ
* NR_LEVELS
];
81 memset (&alt
, 0, sizeof (alt
));
83 alt
.ss_size
= SIGSTKSZ
;
85 if (sigaltstack (&alt
, NULL
) < 0)
87 perror ("sigaltstack");
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