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#define TEST_MACROS
#include <init/stdlib.h>
#include <init/tests/main.h>
#include <shared/flags.h>
#include <shared/syscalls.h>
static void run_forked(void (*fn)()) {
if (!_syscall_fork(0, NULL)) {
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, NULL))
_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, NULL)) { // invalid memory access
asm volatile("movb $69, 0" ::: "memory");
printf("this shouldn't happen");
_syscall_exit(-1);
}
if (!_syscall_fork(0, NULL)) { // #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;
if (_syscall_fork(FORK_NEWFS, &h)) { /* child */
// 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);
} else { /* parent */
_syscall_mount(h, "/", 1);
int ret = _syscall_open("/", 1, 0);
// the handler quits while handling that call - but this syscall should return anyways
_syscall_exit(ret < 0 ? 0 : -1);
}
}
static void test_orphaned_fs(void) {
handle_t h;
if (_syscall_fork(FORK_NEWFS, &h)) { /* child */
_syscall_exit(0);
} else { /* parent */
_syscall_mount(h, "/", 1);
int ret = _syscall_open("/", 1, 0);
// no handler will ever be available to handle this call - the syscall should instantly return
_syscall_exit(ret < 0 ? 0 : -1);
}
}
static void test_memflag(void) {
void *page = (void*)0x77777000;
_syscall_memflag(page, 4096, MEMFLAG_PRESENT); // allocate page
memset(page, 77, 4096); // write to it
_syscall_memflag(page, 4096, 0); // free it
if (!_syscall_fork(0, NULL)) {
memset(page, 11, 4096); // should segfault
_syscall_exit(0);
} else {
assert(_syscall_await() != 0); // test if the process crashed
}
char *pages[4];
for (size_t i = 0; i < 4; i++) {
pages[i] = _syscall_memflag(NULL, 4096, MEMFLAG_FINDFREE);
printf("[test_memflag] findfree: 0x%x\n", pages[i]);
assert(pages[i] == _syscall_memflag(NULL, 4096, MEMFLAG_FINDFREE | MEMFLAG_PRESENT));
if (i > 0) assert(pages[i] != pages[i-1]);
*pages[i] = 0x77;
}
for (size_t i = 0; i < 4; i++)
_syscall_memflag(pages, 4096, MEMFLAG_PRESENT);
// TODO check if reclaims
}
static void test_malloc(void) {
// not really a test
void *p1, *p2;
p1 = malloc(420);
printf("p1 = 0x%x\n", p1);
p2 = malloc(1024);
printf("p2 = 0x%x\n", p2);
free(p2);
p2 = malloc(256);
printf("p2 = 0x%x\n", p2);
free(p2);
p2 = malloc(4096);
printf("p2 = 0x%x\n", p2);
free(p2);
free(p1);
}
static void test_misc(void) {
assert(_syscall(~0, 0, 0, 0, 0) < 0); /* try making an invalid syscall */
}
static void stress_fork(void) {
/* run a lot of processes */
for (size_t i = 0; i < 2048; i++) {
if (!_syscall_fork(0, NULL)) _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(test_memflag);
run_forked(test_malloc);
run_forked(test_pipe);
run_forked(test_misc);
run_forked(stress_fork);
}
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