diff --git a/Lib/test/test_signal.py b/Lib/test/test_signal.py
@@ -127,8 +127,6 @@ def test_strsignal(self):
        self.assertIn("Terminated", signal.strsignal(signal.SIGTERM))
        self.assertIn("Hangup", signal.strsignal(signal.SIGHUP))

-    # TODO: RUSTPYTHON
-    @unittest.expectedFailure
    # Issue 3864, unknown if this affects earlier versions of freebsd also
    def test_interprocess_signal(self):
        dirname = os.path.dirname(__file__)
@@ -820,8 +818,6 @@ def sig_prof(self, *args):
        self.hndl_called = True
        signal.setitimer(signal.ITIMER_PROF, 0)

-    # TODO: RUSTPYTHON
-    @unittest.expectedFailure
    def test_itimer_exc(self):
        # XXX I'm assuming -1 is an invalid itimer, but maybe some platform
        # defines it ?
@@ -831,16 +827,12 @@ def test_itimer_exc(self):
            self.assertRaises(signal.ItimerError,
                              signal.setitimer, signal.ITIMER_REAL, -1)

-    # TODO: RUSTPYTHON
-    @unittest.expectedFailure
    def test_itimer_real(self):
        self.itimer = signal.ITIMER_REAL
        signal.setitimer(self.itimer, 1.0)
        signal.pause()
        self.assertEqual(self.hndl_called, True)

-    # TODO: RUSTPYTHON
-    @unittest.expectedFailure
    # Issue 3864, unknown if this affects earlier versions of freebsd also
    @unittest.skipIf(sys.platform in ('netbsd5',),
        'itimer not reliable (does not mix well with threading) on some BSDs.')
@@ -861,8 +853,6 @@ def test_itimer_virtual(self):
        # and the handler should have been called
        self.assertEqual(self.hndl_called, True)

-    # TODO: RUSTPYTHON
-    @unittest.expectedFailure
    def test_itimer_prof(self):
        self.itimer = signal.ITIMER_PROF
        signal.signal(signal.SIGPROF, self.sig_prof)
@@ -880,8 +870,6 @@ def test_itimer_prof(self):
        # and the handler should have been called
        self.assertEqual(self.hndl_called, True)

-    # TODO: RUSTPYTHON
-    @unittest.expectedFailure
    def test_setitimer_tiny(self):
        # bpo-30807: C setitimer() takes a microsecond-resolution interval.
        # Check that float -> timeval conversion doesn't round

diff --git a/crates/vm/src/stdlib/posix.rs b/crates/vm/src/stdlib/posix.rs
@@ -1738,9 +1738,17 @@ pub mod module {
    #[pyfunction]
    fn waitpid(pid: libc::pid_t, opt: i32, vm: &VirtualMachine) -> PyResult<(libc::pid_t, i32)> {
        let mut status = 0;
-        let pid = unsafe { libc::waitpid(pid, &mut status, opt) };
-        let pid = nix::Error::result(pid).map_err(|err| err.into_pyexception(vm))?;
-        Ok((pid, status))
    }

    #[pyfunction]

diff --git a/crates/vm/src/stdlib/signal.rs b/crates/vm/src/stdlib/signal.rs
@@ -19,6 +19,11 @@ pub(crate) mod _signal {
        convert::{IntoPyException, TryFromBorrowedObject},
    };
    use crate::{PyObjectRef, PyResult, VirtualMachine, signal};
    use std::sync::atomic::{self, Ordering};

    #[cfg(any(unix, windows))]
@@ -89,6 +94,18 @@ pub(crate) mod _signal {
        fn siginterrupt(sig: i32, flag: i32) -> i32;
    }

    #[pyattr]
    use crate::signal::NSIG;

@@ -114,6 +131,31 @@ pub(crate) mod _signal {
    #[pyattr]
    use libc::{SIGPWR, SIGSTKFLT};

    #[cfg(any(unix, windows))]
    pub(super) fn init_signal_handlers(
        module: &Py<crate::builtins::PyModule>,
@@ -216,6 +258,80 @@ pub(crate) mod _signal {
        prev_time.unwrap_or(0)
    }

    #[pyfunction]
    fn default_int_handler(
        _signum: PyObjectRef,