Commit | Line | Data |
---|---|---|
075559bc AC |
1 | #include <signal.h> |
2 | #include <unistd.h> | |
3 | #include <stdlib.h> | |
4 | ||
5 | void foo (void); | |
6 | void bar (void); | |
7 | ||
8 | void subroutine (int); | |
9 | void handler (int); | |
10 | void have_a_very_merry_interrupt (void); | |
11 | ||
12 | main () | |
13 | { | |
14 | puts ("Starting up"); | |
15 | ||
16 | foo (); /* Put a breakpoint on foo() and call it to see a dummy frame */ | |
17 | ||
18 | ||
19 | have_a_very_merry_interrupt (); | |
20 | ||
21 | puts ("Shutting down"); | |
22 | } | |
23 | ||
24 | void | |
25 | foo (void) | |
26 | { | |
27 | puts ("hi in foo"); | |
28 | } | |
29 | ||
30 | void | |
31 | bar (void) | |
32 | { | |
33 | char *nuller = 0; | |
34 | ||
35 | puts ("hi in bar"); | |
36 | ||
37 | *nuller = 'a'; /* try to cause a segfault */ | |
38 | } | |
39 | ||
40 | void | |
41 | handler (int sig) | |
42 | { | |
43 | subroutine (sig); | |
44 | } | |
45 | ||
c56716b0 JM |
46 | /* The first statement in subroutine () is a place for a breakpoint. |
47 | Without it, the breakpoint is put on the while comparison and will | |
48 | be hit at each iteration. */ | |
49 | ||
075559bc AC |
50 | void |
51 | subroutine (int in) | |
52 | { | |
5d0331e5 JM |
53 | int count = in; |
54 | while (count < 100) | |
55 | count++; | |
075559bc AC |
56 | } |
57 | ||
58 | void | |
59 | have_a_very_merry_interrupt (void) | |
60 | { | |
61 | puts ("Waiting to get a signal"); | |
62 | signal (SIGALRM, handler); | |
63 | alarm (1); | |
64 | sleep (2); /* We'll receive that signal while sleeping */ | |
65 | } | |
66 |