tests: Notify process-list after trap was created

Previously there was no waiting for establish of bash trap.
This may result in situation when sigint/term was send before trap
making test fail.

Solution is to catch the sigusr1 and sigusr2 signals in tests and wait
till these signals are sent by bash after trap is established.

Signed-off-by: Jan Friesse <jfriesse@redhat.com>

qdevices/test-process-list.c

@@ -61,6 +61,22 @@
 
 static int no_executed;
 static int no_finished;
+static volatile sig_atomic_t sigusr1_received;
+static volatile sig_atomic_t sigusr2_received;
+
+static void
+signal_usr1_handler(int sig)
+{
+
+	sigusr1_received = 1;
+}
+
+static void
+signal_usr2_handler(int sig)
+{
+
+	sigusr2_received = 1;
+}
 
 static void
 signal_handlers_register(void)
@@ -78,6 +94,18 @@ signal_handlers_register(void)
 	act.sa_flags = SA_RESTART;
 
 	sigaction(SIGPIPE, &act, NULL);
+
+	act.sa_handler = signal_usr1_handler;
+	sigemptyset(&act.sa_mask);
+	act.sa_flags = SA_RESTART;
+
+	sigaction(SIGUSR1, &act, NULL);
+
+	act.sa_handler = signal_usr2_handler;
+	sigemptyset(&act.sa_mask);
+	act.sa_flags = SA_RESTART;
+
+	sigaction(SIGUSR2, &act, NULL);
 }
 
 static void
@@ -145,12 +173,44 @@ wait_for_no_running(struct process_list *plist, int no_running, int no_in_kill_l
 	return (-1);
 }
 
+static int
+wait_for_sigusrs_received(void)
+{
+	int timeout;
+	int no_repeats;
+	int i;
+
+	no_repeats = WAIT_FOR_NO_RUNNING_REPEATS;
+	timeout = WAIT_FOR_NO_RUNNING_TIMEOUT / no_repeats;
+
+	for (i = 0; i < no_repeats; i++) {
+		if (sigusr1_received && sigusr2_received) {
+			return (0);
+		}
+
+		poll(NULL, 0, timeout);
+	}
+
+	return (-1);
+}
+
+
 int
 main(void)
 {
 	struct process_list plist;
 	struct process_list_entry *plist_entry;
 	char *true_path, *false_path;
+	char ignore_sigint_cmd[PATH_MAX];
+	char ignore_sigintterm_cmd[PATH_MAX];
+
+	assert(snprintf(ignore_sigint_cmd, PATH_MAX,
+	    "bash -c \"trap 'echo trap' SIGINT;kill -USR1 %ld;while true;do sleep 1;done\"",
+	    (long int)getpid()) < PATH_MAX);
+
+	assert(snprintf(ignore_sigintterm_cmd, PATH_MAX,
+	    "bash -c \"trap 'echo trap' SIGINT SIGTERM;kill -USR2 %ld;while true;do sleep 1;done\"",
+	    (long int)getpid()) < PATH_MAX);
 
 	assert((true_path = find_exec_path("true")) != NULL);
 	assert((false_path = find_exec_path("false")) != NULL);
@@ -316,10 +376,12 @@ main(void)
 	/*
 	 * Test two bash proceses. One ignores INT and second ignores INT and TERM.
 	 */
-	plist_entry = process_list_add(&plist, "ignoresig1", "bash -c \"trap 'echo trap' SIGINT;while true;do sleep 1;done\"");
+	sigusr1_received = 0;
+	plist_entry = process_list_add(&plist, "ignoresig1", ignore_sigint_cmd);
 	assert(plist_entry != NULL);
 
-	plist_entry = process_list_add(&plist, "ignoresig2", "bash -c \"trap 'echo trap' SIGINT SIGTERM;while true;do sleep 1;done\"");
+	sigusr2_received = 0;
+	plist_entry = process_list_add(&plist, "ignoresig2", ignore_sigintterm_cmd);
 	assert(plist_entry != NULL);
 
 	no_executed = 0;
@@ -327,6 +389,7 @@ main(void)
 	assert(process_list_exec_initialized(&plist) == 0);
 	assert(no_executed == 2);
 	assert(process_list_get_no_running(&plist) == 2);
+	assert(wait_for_sigusrs_received() == 0);
 
 	/*
 	 * Wait some time. 2 processes should be running
@@ -388,10 +451,12 @@ main(void)
 	plist_entry = process_list_add(&plist, "true", true_path);
 	assert(plist_entry != NULL);
 
-	plist_entry = process_list_add(&plist, "ignoresig1", "bash -c \"trap 'echo trap' SIGINT;while true;do sleep 1;done\"");
+	sigusr1_received = 0;
+	plist_entry = process_list_add(&plist, "ignoresig1", ignore_sigint_cmd);
 	assert(plist_entry != NULL);
 
-	plist_entry = process_list_add(&plist, "ignoresig2", "bash -c \"trap 'echo trap' SIGINT SIGTERM;while true;do sleep 1;done\"");
+	sigusr2_received = 0;
+	plist_entry = process_list_add(&plist, "ignoresig2", ignore_sigintterm_cmd);
 	assert(plist_entry != NULL);
 
 	plist_entry = process_list_add(&plist, "true4", true_path);
@@ -402,6 +467,7 @@ main(void)
 	assert(process_list_exec_initialized(&plist) == 0);
 	assert(no_executed == 3);
 	assert(process_list_get_no_running(&plist) == 3);
+	assert(wait_for_sigusrs_received() == 0);
 
 	assert(wait_for_no_running(&plist, 2, 0) == 0);
 
@@ -486,10 +552,12 @@ main(void)
 	 * Test process_list_killall by running two bash proceses.
 	 * One ignores INT and second ignores INT and TERM. Waiting for maximum of 2 sec
 	 */
-	plist_entry = process_list_add(&plist, "ignoresig1", "bash -c \"trap 'echo trap' SIGINT;while true;do sleep 1;done\"");
+	sigusr1_received = 0;
+	plist_entry = process_list_add(&plist, "ignoresig1", ignore_sigint_cmd);
 	assert(plist_entry != NULL);
 
-	plist_entry = process_list_add(&plist, "ignoresig2", "bash -c \"trap 'echo trap' SIGINT SIGTERM;while true;do sleep 1;done\"");
+	sigusr2_received = 0;
+	plist_entry = process_list_add(&plist, "ignoresig2", ignore_sigintterm_cmd);
 	assert(plist_entry != NULL);
 
 	no_executed = 0;
@@ -497,6 +565,7 @@ main(void)
 	assert(process_list_exec_initialized(&plist) == 0);
 	assert(no_executed == 2);
 	assert(process_list_get_no_running(&plist) == 2);
+	assert(wait_for_sigusrs_received() == 0);
 
 	/*
 	 * Ensure processes are running after pause