1 // RUN: %clangxx -std=c++11 -O0 -g %s -o %t && %run %t
2 
3 #include <assert.h>
4 #include <signal.h>
5 #include <unistd.h>
6 
7 static bool sahandler_done;
8 static bool sasigaction_done;
9 
10 static void sahandler(int) { sahandler_done = true; }
11 
12 static void sasigaction(int, siginfo_t *, void *) { sasigaction_done = true; }
13 
14 template <typename T> void install(T *handler, struct sigaction *prev) {
15   bool siginfo = handler == (T *)&sasigaction;
16   struct sigaction act = {};
17   if (siginfo) {
18     act.sa_flags = SA_SIGINFO;
19     act.sa_sigaction = (decltype(act.sa_sigaction))handler;
20   } else {
21     act.sa_handler = (decltype(act.sa_handler))handler;
22   }
23   int ret = sigaction(SIGHUP, &act, prev);
24   assert(ret == 0);
25 
26   if (handler == (T *)&sahandler) {
27     sahandler_done = false;
28     raise(SIGHUP);
29     assert(sahandler_done);
30   }
31 
32   if (handler == (T *)&sasigaction) {
33     sasigaction_done = false;
34     raise(SIGHUP);
35     assert(sasigaction_done);
36   }
37 }
38 
39 template <typename T1, typename T2> void test(T1 *from, T2 *to) {
40   install(from, nullptr);
41   struct sigaction prev = {};
42   install(to, &prev);
43 
44   bool siginfo_from = (from == (T1 *)&sasigaction);
45   if (siginfo_from) {
46     assert(prev.sa_flags & SA_SIGINFO);
47     assert(prev.sa_sigaction == (decltype(prev.sa_sigaction))from);
48   } else {
49     assert((prev.sa_flags & SA_SIGINFO) == 0);
50     assert(prev.sa_handler == (decltype(prev.sa_handler))from);
51   }
52 }
53 
54 template <typename T> void testAll(T *to) {
55   test(&sahandler, to);
56   test(&sasigaction, to);
57   test(SIG_IGN, to);
58   test(SIG_DFL, to);
59 }
60 
61 int main(void) {
62   testAll(&sahandler);
63   testAll(&sasigaction);
64   testAll(SIG_IGN);
65   testAll(SIG_DFL);
66 }
67