Remove dependency on signal() function

Replaces uses of signal() with sigaction() which should be far
more portable.

tests/common/Makefile.am

@@ -18,6 +18,7 @@ test_common_SOURCES = \
     test_list_calls.c \
     test_string_calls.c \
     test_os_calls.c \
+    test_os_calls_signals.c \
     test_ssl_calls.c \
     test_base64.c \
     test_guid.c

tests/common/test_common.h

@@ -15,4 +15,9 @@ Suite *make_suite_test_ssl_calls(void);
 Suite *make_suite_test_base64(void);
 Suite *make_suite_test_guid(void);
 
+TCase *make_tcase_test_os_calls_signals(void);
+
+void os_calls_signals_init(void);
+void os_calls_signals_deinit(void);
+
 #endif /* TEST_COMMON_H */

tests/common/test_common_main.c

@@ -64,14 +64,17 @@ int main (void)
      * reporting when running in libcheck fork mode */
     setvbuf(stdout, NULL, _IONBF, 0);
 
-    /* Initialise the ssl module */
+    /* Initialise modules */
     ssl_init();
+    os_calls_signals_init();
 
     srunner_run_all (sr, CK_ENV);
     number_failed = srunner_ntests_failed(sr);
     srunner_free(sr);
 
     ssl_finish();
+    os_calls_signals_deinit();
+
     log_end();
     return (number_failed == 0) ? EXIT_SUCCESS : EXIT_FAILURE;
 }

tests/common/test_os_calls.c

@@ -512,5 +512,9 @@ make_suite_test_os_calls(void)
     tcase_add_test(tc_os_calls, test_g_file_is_open);
     tcase_add_test(tc_os_calls, test_g_sck_fd_passing);
     tcase_add_test(tc_os_calls, test_g_sck_fd_overflow);
+
+    // Add other test cases in other files
+    suite_add_tcase(s, make_tcase_test_os_calls_signals());
+
     return s;
 }