#include #include #include #define argify(str) str, sizeof(str) - 1 #define test_fail() do { \ printf("\033[31m" "TEST FAILED: %s:%xh\n" "\033[0m", __func__, __LINE__); \ return; \ } while (0) #define assert(cond) if (!(cond)) test_fail(); static void run_forked(void (*fn)()) { if (!_syscall_fork(0)) { fn(); _syscall_exit(0); } else { /* successful tests must return 0 * TODO add a better fail msg */ if (_syscall_await() != 0) test_fail(); } } static void test_await(void) { /* creates 16 child processes, each returning a different value. then checks * if await() returns every value exactly once */ int ret; int counts[16] = {0}; for (int i = 0; i < 16; i++) if (!_syscall_fork(0)) _syscall_exit(i); while ((ret = _syscall_await()) != ~0) { assert(0 <= ret && ret < 16); counts[ret]++; } for (int i = 0; i < 16; i++) assert(counts[i] == 1); } static void test_faults(void) { /* tests what happens when child processes fault. * expected behavior: parent processes still manages to finish, and it can * reap all its children */ int await_cnt = 0; if (!_syscall_fork(0)) { // invalid memory access asm volatile("movb $69, 0" ::: "memory"); printf("this shouldn't happen"); _syscall_exit(-1); } if (!_syscall_fork(0)) { // #GP asm volatile("hlt" ::: "memory"); printf("this shouldn't happen"); _syscall_exit(-1); } while (_syscall_await() != ~0) await_cnt++; assert(await_cnt == 2); } static void test_interrupted_fs(void) { handle_t h = _syscall_fs_fork2(); if (h) { _syscall_mount(h, "/", 1); int ret = _syscall_open("/", 1); // the handler quits while handling that call - but this syscall should return anyways _syscall_exit(ret < 0 ? 0 : -1); } else { // TODO make a similar test with all 0s passed to fs_wait struct fs_wait_response res; _syscall_fs_wait(NULL, 0, &res); _syscall_exit(0); } } static void test_orphaned_fs(void) { handle_t h = _syscall_fs_fork2(); if (h) { _syscall_mount(h, "/", 1); int ret = _syscall_open("/", 1); // no handler will ever be available to handle this call - the syscall should instantly return _syscall_exit(ret < 0 ? 0 : -1); } else { _syscall_exit(0); } } static void stress_fork(void) { /* run a lot of processes */ for (size_t i = 0; i < 2048; i++) { if (!_syscall_fork(0)) _syscall_exit(0); _syscall_await(); } } void test_all(void) { run_forked(test_await); run_forked(test_faults); run_forked(test_interrupted_fs); run_forked(test_orphaned_fs); run_forked(stress_fork); }