28 struct child {  struct
33 static void release_child(struct child *child)  in release_child()  argument
37 	if (!child)  in release_child()
39 	close(child->go[1]);  in release_child()
40 	close(child->go[0]);  in release_child()
41 	if (child->pid > 0)  in release_child()
42 		waitpid(child->pid, &child_status, 0);  in release_child()
45 static void kick_child(struct child *child)  in kick_child()  argument
49 	if (child) {  in kick_child()
50 		write(child->go[1], &c, 1);  in kick_child()
51 		release_child(child);  in kick_child()
56 static struct child *spawn_child(void)  in spawn_child()
58 	static struct child child;  in spawn_child()  local
62 	/* pipe to notify child to execute the trigger functions */  in spawn_child()
63 	if (pipe(child.go))  in spawn_child()
66 	child.pid = fork();  in spawn_child()
67 	if (child.pid < 0) {  in spawn_child()
68 		release_child(&child);  in spawn_child()
73 	/* child */  in spawn_child()
74 	if (child.pid == 0) {  in spawn_child()
75 		close(child.go[1]);  in spawn_child()
78 		err = read(child.go[0], &c, 1);  in spawn_child()
89 	return &child;  in spawn_child()
92 static void uprobe_multi_test_run(struct uprobe_multi *skel, struct child *child)  in uprobe_multi_test_run()  argument
102 	 * because the probe should be executed only by child->pid  in uprobe_multi_test_run()
105 	skel->bss->pid = child ? 0 : getpid();  in uprobe_multi_test_run()
107 	if (child)  in uprobe_multi_test_run()
108 		kick_child(child);  in uprobe_multi_test_run()
129 	if (child)  in uprobe_multi_test_run()
130 		ASSERT_EQ(skel->bss->child_pid, child->pid, "uprobe_multi_child_pid");  in uprobe_multi_test_run()
154 		  struct child *child)  in __test_attach_api()  argument
156 	pid_t pid = child ? child->pid : -1;  in __test_attach_api()
193 	uprobe_multi_test_run(skel, child);  in __test_attach_api()
202 	struct child *child;  in test_attach_api()  local
208 	child = spawn_child();  in test_attach_api()
209 	if (!ASSERT_OK_PTR(child, "spawn_child"))  in test_attach_api()
212 	__test_attach_api(binary, pattern, opts, child);  in test_attach_api()
408 static void __test_link_api(struct child *child)  in __test_link_api()  argument
430 	opts.uprobe_multi.pid = child ? child->pid : 0;  in __test_link_api()
467 	uprobe_multi_test_run(skel, child);  in __test_link_api()
487 	struct child *child;  in test_link_api()  local
493 	child = spawn_child();  in test_link_api()
494 	if (!ASSERT_OK_PTR(child, "spawn_child"))  in test_link_api()
497 	__test_link_api(child);  in test_link_api()