1 #include <sys/types.h>
2 #include <sys/wait.h>
3 #include <assert.h>
4 #if defined(TEST_CLONE)
5 #include <sched.h>
6 #endif
7 #include <stdint.h>
8 #include <stdio.h>
9 #include <unistd.h>
10 
11 int g_val = 0;
12 
13 void parent_func() {
14   g_val = 1;
15   printf("function run in parent\n");
16 }
17 
18 int child_func(void *unused) {
19   // we need to avoid memory modifications for vfork(), yet we want
20   // to be able to test watchpoints, so do the next best thing
21   // and restore the original value
22   g_val = 2;
23   g_val = 0;
24   return 0;
25 }
26 
27 int main() {
28   alignas(uintmax_t) char stack[4096];
29 
30 #if defined(TEST_CLONE)
31   pid_t pid = clone(child_func, &stack[sizeof(stack)], 0, NULL);
32 #elif defined(TEST_FORK)
33   pid_t pid = TEST_FORK();
34   if (pid == 0)
35     _exit(child_func(NULL));
36 #endif
37   assert(pid != -1);
38 
39   parent_func();
40   int status, wait_flags = 0;
41 #if defined(TEST_CLONE)
42   wait_flags = __WALL;
43 #endif
44   pid_t waited = waitpid(pid, &status, wait_flags);
45   assert(waited == pid);
46   assert(WIFEXITED(status));
47   printf("child exited: %d\n", WEXITSTATUS(status));
48 
49   return 0;
50 }
51