Source of /tests/poll.c (From xnu-11215.1.10)

#ifdef T_NAMESPACE
#undef T_NAMESPACE
#endif
#include <darwintest.h>

#include <dispatch/dispatch.h>
#include <fcntl.h>
#include <mach/mach.h>
#include <poll.h>
#include <stdint.h>
#include <unistd.h>

T_GLOBAL_META(T_META_NAMESPACE("xnu.poll"),
    T_META_RUN_CONCURRENTLY(true));

#define SLEEP_TIME_SECS 1
#define POLL_TIMEOUT_MS 1800
static_assert(POLL_TIMEOUT_MS > (SLEEP_TIME_SECS * 1000),
    "poll timeout should be longer than sleep time");

/*
 * This matches the behavior of other UNIXes, but is under-specified in POSIX.
 *
 * See <rdar://problem/28372390>.
 */
T_DECL(sleep_with_no_fds,
    "poll() called with no fds provided should act like sleep", T_META_TAG_VM_PREFERRED)
{
	uint64_t begin_time, sleep_time, poll_time;
	struct pollfd pfd = { .fd = 0, .events = 0, .revents = 0 };

	begin_time = mach_absolute_time();
	sleep(SLEEP_TIME_SECS);
	sleep_time = mach_absolute_time() - begin_time;
	T_LOG("sleep(%d) ~= %llu mach absolute time units", SLEEP_TIME_SECS, sleep_time);

	begin_time = mach_absolute_time();
	T_ASSERT_POSIX_SUCCESS(poll(&pfd, 0, POLL_TIMEOUT_MS),
	    "poll() with 0 events and timeout %d ms", POLL_TIMEOUT_MS);
	poll_time = mach_absolute_time() - begin_time;

	T_EXPECT_GT(poll_time, sleep_time,
	    "poll(... %d) should wait longer than sleep(1)", POLL_TIMEOUT_MS);
}

#define LAUNCHD_PATH "/sbin/launchd"
#define PIPE_DIR_TIMEOUT_SECS 1

/*
 * See <rdar://problem/28539155>.
 */
T_DECL(directories,
    "poll() with directories should return an error", T_META_TAG_VM_PREFERRED)
{
	int file, dir, pipes[2];
	struct pollfd pfd[] = {
		{ .events = POLLIN },
		{ .events = POLLIN },
		{ .events = POLLIN },
	};

	file = open(LAUNCHD_PATH, O_RDONLY | O_NONBLOCK);
	T_QUIET; T_ASSERT_POSIX_SUCCESS(file, "open(%s)", LAUNCHD_PATH);
	dir = open(".", O_RDONLY | O_NONBLOCK);
	T_QUIET; T_ASSERT_POSIX_SUCCESS(dir, "open(\".\")");
	T_QUIET; T_ASSERT_POSIX_SUCCESS(pipe(pipes), NULL);

	/* just directory */
	pfd[0].fd = dir;
	T_EXPECT_POSIX_SUCCESS(poll(pfd, 1, -1), "poll() with a directory");
	T_QUIET; T_EXPECT_TRUE(pfd[0].revents & POLLNVAL,
	    "directory should be an invalid event");

	/* file and directory */
	pfd[0].fd = file; pfd[0].revents = 0;
	pfd[1].fd = dir; pfd[1].revents = 0;
	T_EXPECT_POSIX_SUCCESS(poll(pfd, 2, -1),
	    "poll() with a file and directory");
	T_QUIET; T_EXPECT_TRUE(pfd[0].revents & POLLIN, "file should be readable");
	T_QUIET; T_EXPECT_TRUE(pfd[1].revents & POLLNVAL,
	    "directory should be an invalid event");

	/* directory and file */
	pfd[0].fd = dir; pfd[0].revents = 0;
	pfd[1].fd = file; pfd[1].revents = 0;
	T_EXPECT_POSIX_SUCCESS(poll(pfd, 2, -1),
	    "poll() with a directory and a file");
	T_QUIET; T_EXPECT_TRUE(pfd[0].revents & POLLNVAL,
	    "directory should be an invalid event");
	T_QUIET; T_EXPECT_TRUE(pfd[1].revents & POLLIN, "file should be readable");

	/* file and pipe */
	pfd[0].fd = file; pfd[0].revents = 0;
	pfd[1].fd = pipes[0]; pfd[0].revents = 0;
	T_EXPECT_POSIX_SUCCESS(poll(pfd, 2, -1),
	    "poll() with a file and pipe");
	T_QUIET; T_EXPECT_TRUE(pfd[0].revents & POLLIN, "file should be readable");
	T_QUIET; T_EXPECT_FALSE(pfd[1].revents & POLLIN,
	    "pipe should not be readable");

	/* file, directory, and pipe */
	pfd[0].fd = file; pfd[0].revents = 0;
	pfd[1].fd = dir; pfd[1].revents = 0;
	pfd[2].fd = pipes[0]; pfd[2].revents = 0;
	T_EXPECT_POSIX_SUCCESS(poll(pfd, 3, -1),
	    "poll() with a file, directory, and pipe");
	T_QUIET; T_EXPECT_TRUE(pfd[0].revents & POLLIN, "file should be readable");
	T_QUIET; T_EXPECT_TRUE(pfd[1].revents & POLLNVAL,
	    "directory should be an invalid event");
	T_QUIET; T_EXPECT_FALSE(pfd[2].revents & POLLIN, "pipe should not be readable");

	/* directory and pipe */
	__block bool timed_out = true;
	pfd[0].fd = dir; pfd[0].revents = 0;
	pfd[1].fd = pipes[0]; pfd[1].revents = 0;
	dispatch_after(dispatch_time(DISPATCH_TIME_NOW,
	    PIPE_DIR_TIMEOUT_SECS * NSEC_PER_SEC),
	    dispatch_get_global_queue(QOS_CLASS_DEFAULT, 0), ^{
		T_ASSERT_FALSE(timed_out, "poll timed out after %d seconds",
		PIPE_DIR_TIMEOUT_SECS);
	});

	T_EXPECT_POSIX_SUCCESS(poll(pfd, 3, -1),
	    "poll() with a directory and pipe");
	timed_out = false;

	T_QUIET; T_EXPECT_TRUE(pfd[0].revents & POLLNVAL,
	    "directory should be an invalid event");
	T_QUIET; T_EXPECT_FALSE(pfd[1].revents & POLLIN, "pipe should not be readable");
}

#define PRIVATE
#include <libproc.h>

static void *
leak_thread(void *ptr)
{
	T_LOG("Trying to find kevent kernel pointer...\n");

	unsigned char *buffer = (unsigned char*) malloc(16392 * 8);

	while (1) {
		memset(buffer, 0, 16392 * 8);

		// Dump the kevent udatas for self
		int ret = proc_list_uptrs(getpid(), buffer, 16392 * 8);

		if (ret > 0) {
			T_LOG("udata pointers returned: %d\n", ret);
			uint64_t *ptrs = (uint64_t*) buffer;
			for (int i = 0; i < ret; i++) {
				T_EXPECT_EQ(ptrs[i] & 0xffffff0000000000, 0, "kptr? -> 0x%llx\n", ptrs[i]);
			}
			break;
		}
	}

	free(buffer);
	return NULL;
}

T_DECL(poll_dont_leak_kernel_pointers, "poll and proc_pidinfo should not leak kernel pointers", T_META_TAG_VM_PREFERRED)
{
	pthread_t thr;
	pthread_create(&thr, NULL, *leak_thread, (void *) NULL);

	struct pollfd fds[2] = {};
	fds[0].fd = STDERR_FILENO;
	fds[0].events = POLLERR | POLLHUP;
	fds[0].revents = POLLERR;
	fds[1].fd = STDOUT_FILENO;
	fds[1].events = POLLERR | POLLHUP;
	fds[1].revents = POLLERR;

	//int poll_nocancel(struct pollfd *fds, u_int nfds, int timeout)
	poll(fds, 2, 5000);

	pthread_join(thr, NULL);
}