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Copy pathposix.rs
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2674 lines (2403 loc) · 94.8 KB
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// spell-checker:disable
pub(crate) use module::module_def;
pub use rustpython_host_env::posix::set_inheritable;
#[pymodule(name = "posix", with(
super::os::_os,
super::posix_unix_like::_posix_unix_like,
#[cfg(any(
target_os = "linux",
target_os = "netbsd",
target_os = "freebsd",
target_os = "android"
))]
posix_sched
))]
pub mod module {
use crate::{
AsObject, Py, PyObjectRef, PyResult, VirtualMachine,
builtins::{PyDictRef, PyInt, PyListRef, PyTuple, PyTupleRef, PyUtf8Str},
convert::{IntoPyException, ToPyException, ToPyObject, TryFromObject},
exceptions::OSErrorBuilder,
function::{ArgMapping, Either, KwArgs, OptionalArg},
ospath::{OsPath, OsPathOrFd},
stdlib::os::{
_os, DirFd, FollowSymlinks, SupportFunc, SymlinkArgs, fs_metadata, warn_if_bool_fd,
},
};
#[cfg(any(
target_os = "android",
target_os = "freebsd",
target_os = "linux",
target_os = "openbsd"
))]
use crate::{builtins::PyUtf8StrRef, utils::ToCString};
use alloc::ffi::CString;
use core::ffi::CStr;
use rustpython_host_env::os::ffi::OsStringExt;
use std::{
fs, io,
os::fd::{AsRawFd, BorrowedFd, FromRawFd, IntoRawFd, OwnedFd},
};
use strum::IntoEnumIterator;
use strum_macros::{EnumIter, EnumString};
#[cfg(target_os = "linux")]
#[pyattr]
use libc::PIDFD_NONBLOCK;
#[cfg(target_os = "macos")]
#[pyattr]
use libc::{
COPYFILE_DATA as _COPYFILE_DATA, O_EVTONLY, O_NOFOLLOW_ANY, PRIO_DARWIN_BG,
PRIO_DARWIN_NONUI, PRIO_DARWIN_PROCESS, PRIO_DARWIN_THREAD,
};
#[cfg(target_os = "freebsd")]
#[pyattr]
use libc::{SF_MNOWAIT, SF_NOCACHE, SF_NODISKIO, SF_SYNC};
#[cfg(any(target_os = "android", target_os = "linux"))]
#[pyattr]
use libc::{
CLONE_FILES, CLONE_FS, CLONE_NEWCGROUP, CLONE_NEWIPC, CLONE_NEWNET, CLONE_NEWNS,
CLONE_NEWPID, CLONE_NEWUSER, CLONE_NEWUTS, CLONE_SIGHAND, CLONE_SYSVSEM, CLONE_THREAD,
CLONE_VM, MFD_HUGE_SHIFT, O_NOATIME, O_TMPFILE, P_PIDFD, SCHED_BATCH, SCHED_DEADLINE,
SCHED_IDLE, SCHED_NORMAL, SCHED_RESET_ON_FORK, SPLICE_F_MORE, SPLICE_F_MOVE,
SPLICE_F_NONBLOCK,
};
#[cfg(any(target_os = "macos", target_os = "redox"))]
#[pyattr]
use libc::O_SYMLINK;
#[cfg(any(target_os = "android", target_os = "redox", unix))]
#[pyattr]
use libc::{O_NOFOLLOW, PRIO_PGRP, PRIO_PROCESS, PRIO_USER};
#[cfg(any(target_os = "linux", target_os = "macos", target_os = "netbsd"))]
#[pyattr]
use libc::{XATTR_CREATE, XATTR_REPLACE};
#[cfg(any(target_os = "android", target_os = "linux", target_os = "netbsd"))]
#[pyattr]
use libc::O_RSYNC;
#[cfg(any(target_os = "android", target_os = "freebsd", target_os = "linux"))]
#[pyattr]
use libc::{
MFD_ALLOW_SEALING, MFD_CLOEXEC, MFD_HUGE_MASK, MFD_HUGETLB, POSIX_FADV_DONTNEED,
POSIX_FADV_NOREUSE, POSIX_FADV_NORMAL, POSIX_FADV_RANDOM, POSIX_FADV_SEQUENTIAL,
POSIX_FADV_WILLNEED,
};
#[cfg(any(target_os = "android", target_os = "linux", target_os = "redox", unix))]
#[pyattr]
use libc::{RTLD_LAZY, RTLD_NOW, WNOHANG};
#[cfg(any(target_os = "android", target_os = "macos", target_os = "redox", unix))]
#[pyattr]
use libc::RTLD_GLOBAL;
#[cfg(any(
target_os = "android",
target_os = "freebsd",
target_os = "linux",
target_os = "redox"
))]
#[pyattr]
use libc::O_PATH;
#[cfg(any(
target_os = "android",
target_os = "freebsd",
target_os = "linux",
target_os = "netbsd"
))]
#[pyattr]
use libc::{
EFD_CLOEXEC, EFD_NONBLOCK, EFD_SEMAPHORE, TFD_CLOEXEC, TFD_NONBLOCK, TFD_TIMER_ABSTIME,
TFD_TIMER_CANCEL_ON_SET,
};
#[cfg(any(
target_os = "android",
target_os = "dragonfly",
target_os = "linux",
target_os = "netbsd"
))]
#[pyattr]
use libc::{GRND_NONBLOCK, GRND_RANDOM};
#[cfg(any(
target_os = "android",
target_os = "linux",
target_os = "macos",
target_os = "redox",
unix
))]
#[pyattr]
use libc::{F_OK, R_OK, W_OK, X_OK};
#[cfg(any(
target_os = "android",
target_os = "freebsd",
target_os = "netbsd",
target_os = "redox",
unix
))]
#[pyattr]
use libc::O_NONBLOCK;
#[cfg(any(
target_os = "android",
target_os = "freebsd",
target_os = "linux",
target_os = "macos",
target_os = "netbsd"
))]
#[pyattr]
use libc::O_DSYNC;
#[cfg(any(
target_os = "dragonfly",
target_os = "freebsd",
target_os = "linux",
target_os = "macos",
target_os = "netbsd"
))]
#[pyattr]
use libc::SCHED_OTHER;
#[cfg(any(
target_os = "android",
target_os = "dragonfly",
target_os = "freebsd",
target_os = "linux",
target_os = "macos"
))]
#[pyattr]
use libc::{RTLD_NODELETE, SEEK_DATA, SEEK_HOLE};
#[cfg(any(
target_os = "android",
target_os = "dragonfly",
target_os = "freebsd",
target_os = "linux",
target_os = "netbsd"
))]
#[pyattr]
use libc::O_DIRECT;
#[cfg(any(
target_os = "dragonfly",
target_os = "freebsd",
target_os = "macos",
target_os = "netbsd",
target_os = "redox"
))]
#[pyattr]
use libc::{O_EXLOCK, O_FSYNC, O_SHLOCK};
#[cfg(any(
target_os = "android",
target_os = "linux",
target_os = "macos",
target_os = "netbsd",
target_os = "redox",
unix
))]
#[pyattr]
use libc::RTLD_LOCAL;
#[cfg(any(
target_os = "android",
target_os = "freebsd",
target_os = "linux",
target_os = "netbsd",
target_os = "redox",
unix
))]
#[pyattr]
use libc::WUNTRACED;
#[cfg(any(
target_os = "android",
target_os = "dragonfly",
target_os = "freebsd",
target_os = "linux",
target_os = "macos",
target_os = "netbsd"
))]
#[pyattr]
use libc::{
CLD_CONTINUED, CLD_DUMPED, CLD_EXITED, CLD_KILLED, CLD_STOPPED, CLD_TRAPPED, O_SYNC, P_ALL,
P_PGID, P_PID, SCHED_FIFO, SCHED_RR,
};
#[cfg(any(
target_os = "android",
target_os = "dragonfly",
target_os = "freebsd",
target_os = "macos",
target_os = "netbsd",
target_os = "redox",
unix
))]
#[pyattr]
use libc::O_DIRECTORY;
#[cfg(any(
target_os = "android",
target_os = "dragonfly",
target_os = "freebsd",
target_os = "linux",
target_os = "macos",
target_os = "netbsd",
target_os = "redox"
))]
#[pyattr]
use libc::{
F_LOCK, F_TEST, F_TLOCK, F_ULOCK, O_ASYNC, O_NDELAY, O_NOCTTY, RTLD_NOLOAD, WEXITED,
WNOWAIT, WSTOPPED,
};
#[cfg(any(
target_os = "android",
target_os = "dragonfly",
target_os = "freebsd",
target_os = "linux",
target_os = "macos",
target_os = "netbsd",
target_os = "redox",
unix
))]
#[pyattr]
use libc::{O_CLOEXEC, WCONTINUED};
#[pyattr]
const EX_OK: i8 = exitcode::OK as i8;
#[pyattr]
const EX_USAGE: i8 = exitcode::USAGE as i8;
#[pyattr]
const EX_DATAERR: i8 = exitcode::DATAERR as i8;
#[pyattr]
const EX_NOINPUT: i8 = exitcode::NOINPUT as i8;
#[pyattr]
const EX_NOUSER: i8 = exitcode::NOUSER as i8;
#[pyattr]
const EX_NOHOST: i8 = exitcode::NOHOST as i8;
#[pyattr]
const EX_UNAVAILABLE: i8 = exitcode::UNAVAILABLE as i8;
#[pyattr]
const EX_SOFTWARE: i8 = exitcode::SOFTWARE as i8;
#[pyattr]
const EX_OSERR: i8 = exitcode::OSERR as i8;
#[pyattr]
const EX_OSFILE: i8 = exitcode::OSFILE as i8;
#[pyattr]
const EX_CANTCREAT: i8 = exitcode::CANTCREAT as i8;
#[pyattr]
const EX_IOERR: i8 = exitcode::IOERR as i8;
#[pyattr]
const EX_TEMPFAIL: i8 = exitcode::TEMPFAIL as i8;
#[pyattr]
const EX_PROTOCOL: i8 = exitcode::PROTOCOL as i8;
#[pyattr]
const EX_NOPERM: i8 = exitcode::NOPERM as i8;
#[pyattr]
const EX_CONFIG: i8 = exitcode::CONFIG as i8;
#[cfg(any(target_os = "linux", target_os = "freebsd", target_os = "macos"))]
#[pyattr]
const POSIX_SPAWN_OPEN: i32 = PosixSpawnFileActionIdentifier::Open as i32;
#[cfg(any(target_os = "linux", target_os = "freebsd", target_os = "macos"))]
#[pyattr]
const POSIX_SPAWN_CLOSE: i32 = PosixSpawnFileActionIdentifier::Close as i32;
#[cfg(any(target_os = "linux", target_os = "freebsd", target_os = "macos"))]
#[pyattr]
const POSIX_SPAWN_DUP2: i32 = PosixSpawnFileActionIdentifier::Dup2 as i32;
impl TryFromObject for BorrowedFd<'_> {
fn try_from_object(vm: &VirtualMachine, obj: PyObjectRef) -> PyResult<Self> {
crate::stdlib::os::warn_if_bool_fd(&obj, vm)?;
let fd = i32::try_from_object(vm, obj)?;
if fd == -1 {
return Err(io::Error::from_raw_os_error(libc::EBADF).into_pyexception(vm));
}
// SAFETY: none, really. but, python's os api of passing around file descriptors
// everywhere isn't really io-safe anyway, so, this is passed to the user.
Ok(unsafe { BorrowedFd::borrow_raw(fd) })
}
}
impl TryFromObject for OwnedFd {
fn try_from_object(vm: &VirtualMachine, obj: PyObjectRef) -> PyResult<Self> {
let fd = i32::try_from_object(vm, obj)?;
if fd == -1 {
return Err(io::Error::from_raw_os_error(libc::EBADF).into_pyexception(vm));
}
// SAFETY: none, really. but, python's os api of passing around file descriptors
// everywhere isn't really io-safe anyway, so, this is passed to the user.
Ok(unsafe { Self::from_raw_fd(fd) })
}
}
impl ToPyObject for OwnedFd {
fn to_pyobject(self, vm: &VirtualMachine) -> PyObjectRef {
self.into_raw_fd().to_pyobject(vm)
}
}
#[pyfunction]
fn getgroups(vm: &VirtualMachine) -> PyResult<Vec<PyObjectRef>> {
let group_ids =
rustpython_host_env::posix::getgroups().map_err(|e| e.into_pyexception(vm))?;
Ok(group_ids
.into_iter()
.map(|gid| vm.ctx.new_int(gid).into())
.collect())
}
#[pyfunction]
pub(super) fn access(path: OsPath, mode: u8, vm: &VirtualMachine) -> PyResult<bool> {
rustpython_host_env::posix::check_access(path.as_ref(), mode)
.map_err(|err| err.to_pyexception(vm))
}
#[pyfunction]
fn _create_environ(vm: &VirtualMachine) -> PyDictRef {
let environ = vm.ctx.new_dict();
for (key, value) in crate::host_env::os::vars_os() {
let key: PyObjectRef = vm.ctx.new_bytes(key.into_vec()).into();
let value: PyObjectRef = vm.ctx.new_bytes(value.into_vec()).into();
environ.set_item(&*key, value, vm).unwrap();
}
environ
}
#[pyfunction]
pub(super) fn symlink(args: SymlinkArgs<'_>, vm: &VirtualMachine) -> PyResult<()> {
let src = args.src.into_cstring(vm)?;
let dst = args.dst.into_cstring(vm)?;
#[cfg(not(target_os = "redox"))]
{
rustpython_host_env::posix::symlinkat(&src, args.dir_fd.get().into(), &dst)
.map_err(|err| err.into_pyexception(vm))
}
#[cfg(target_os = "redox")]
{
let [] = args.dir_fd.0;
rustpython_host_env::posix::symlink(&src, &dst).map_err(|err| err.into_pyexception(vm))
}
}
#[cfg(not(target_os = "redox"))]
#[pyfunction]
fn fchdir(fd: PyObjectRef, vm: &VirtualMachine) -> PyResult<()> {
warn_if_bool_fd(&fd, vm)?;
let fd = i32::try_from_object(vm, fd)?;
rustpython_host_env::posix::fchdir(fd).map_err(|err| err.into_pyexception(vm))
}
#[cfg(not(target_os = "redox"))]
#[pyfunction]
fn chroot(path: OsPath, vm: &VirtualMachine) -> PyResult<()> {
use crate::exceptions::OSErrorBuilder;
rustpython_host_env::posix::chroot(std::path::Path::new(&path.path))
.map_err(|err| OSErrorBuilder::with_filename(&err, path, vm))
}
// As of now, redox does not seems to support chown command (cf. https://gitlab.redox-os.org/redox-os/coreutils , last checked on 05/07/2020)
#[cfg(not(target_os = "redox"))]
#[pyfunction]
fn chown(
path: OsPathOrFd<'_>,
uid: isize,
gid: isize,
dir_fd: DirFd<'_, 1>,
follow_symlinks: FollowSymlinks,
vm: &VirtualMachine,
) -> PyResult<()> {
let uid = if uid >= 0 {
Some(uid as u32)
} else if uid == -1 {
None
} else {
return Err(vm.new_os_error("Specified uid is not valid."));
};
let gid = if gid >= 0 {
Some(gid as u32)
} else if gid == -1 {
None
} else {
return Err(vm.new_os_error("Specified gid is not valid."));
};
match path {
OsPathOrFd::Path(ref p) => rustpython_host_env::posix::fchownat(
dir_fd.get().into(),
p.path.as_os_str(),
uid,
gid,
follow_symlinks.0,
),
OsPathOrFd::Fd(fd) => rustpython_host_env::posix::fchown(fd.into(), uid, gid),
}
.map_err(|err| OSErrorBuilder::with_filename(&err, path, vm))
}
#[cfg(not(target_os = "redox"))]
#[pyfunction]
fn lchown(path: OsPath, uid: isize, gid: isize, vm: &VirtualMachine) -> PyResult<()> {
chown(
OsPathOrFd::Path(path),
uid,
gid,
DirFd::default(),
FollowSymlinks(false),
vm,
)
}
#[cfg(not(target_os = "redox"))]
#[pyfunction]
fn fchown(fd: BorrowedFd<'_>, uid: isize, gid: isize, vm: &VirtualMachine) -> PyResult<()> {
chown(
OsPathOrFd::Fd(fd.into()),
uid,
gid,
DirFd::default(),
FollowSymlinks(true),
vm,
)
}
#[derive(FromArgs)]
struct RegisterAtForkArgs {
#[pyarg(named, optional)]
before: OptionalArg<PyObjectRef>,
#[pyarg(named, optional)]
after_in_parent: OptionalArg<PyObjectRef>,
#[pyarg(named, optional)]
after_in_child: OptionalArg<PyObjectRef>,
}
impl RegisterAtForkArgs {
fn into_validated(
self,
vm: &VirtualMachine,
) -> PyResult<(
Option<PyObjectRef>,
Option<PyObjectRef>,
Option<PyObjectRef>,
)> {
fn into_option(
arg: OptionalArg<PyObjectRef>,
vm: &VirtualMachine,
) -> PyResult<Option<PyObjectRef>> {
match arg {
OptionalArg::Present(obj) => {
if !obj.is_callable() {
return Err(vm.new_type_error("Args must be callable"));
}
Ok(Some(obj))
}
OptionalArg::Missing => Ok(None),
}
}
let before = into_option(self.before, vm)?;
let after_in_parent = into_option(self.after_in_parent, vm)?;
let after_in_child = into_option(self.after_in_child, vm)?;
if before.is_none() && after_in_parent.is_none() && after_in_child.is_none() {
return Err(vm.new_type_error("At least one arg must be present"));
}
Ok((before, after_in_parent, after_in_child))
}
}
#[pyfunction]
fn register_at_fork(
args: RegisterAtForkArgs,
_ignored: KwArgs,
vm: &VirtualMachine,
) -> PyResult<()> {
let (before, after_in_parent, after_in_child) = args.into_validated(vm)?;
if let Some(before) = before {
vm.state.before_forkers.lock().push(before);
}
if let Some(after_in_parent) = after_in_parent {
vm.state.after_forkers_parent.lock().push(after_in_parent);
}
if let Some(after_in_child) = after_in_child {
vm.state.after_forkers_child.lock().push(after_in_child);
}
Ok(())
}
fn run_at_forkers(mut funcs: Vec<PyObjectRef>, reversed: bool, vm: &VirtualMachine) {
if !funcs.is_empty() {
if reversed {
funcs.reverse();
}
for func in funcs {
if let Err(e) = func.call((), vm) {
let exit = e.fast_isinstance(vm.ctx.exceptions.system_exit);
vm.run_unraisable(e, Some("Exception ignored in".to_owned()), func);
if exit {
// Do nothing!
}
}
}
}
}
fn py_os_before_fork(vm: &VirtualMachine) {
let before_forkers: Vec<PyObjectRef> = vm.state.before_forkers.lock().clone();
// functions must be executed in reversed order as they are registered
// only for before_forkers, refer: test_register_at_fork in test_posix
run_at_forkers(before_forkers, true, vm);
#[cfg(feature = "threading")]
crate::stdlib::_imp::acquire_imp_lock_for_fork(vm);
#[cfg(feature = "threading")]
vm.state.stop_the_world.stop_the_world(&vm.state);
}
fn py_os_after_fork_child(vm: &VirtualMachine) {
// The interpreter registry is reachable from every thread, so repair it
// before anything enumerates interpreters.
#[cfg(all(unix, feature = "threading"))]
unsafe {
crate::vm::runtime::reinit_after_fork()
};
#[cfg(feature = "threading")]
vm.state.stop_the_world.reset_after_fork();
// Phase 1: Reset all internal locks FIRST.
// After fork(), locks held by dead parent threads would deadlock
// if we try to acquire them. This must happen before anything else.
#[cfg(feature = "threading")]
reinit_locks_after_fork(vm);
// The collector stops every interpreter, so interpreters other than the
// forking one must be repaired too; otherwise the child's first
// collection waits for threads that did not survive the fork.
#[cfg(all(unix, feature = "threading"))]
reinit_other_interpreters_after_fork(vm);
// Reinit per-object IO buffer locks on std streams.
// BufferedReader/Writer/TextIOWrapper use PyThreadMutex which can be
// held by dead parent threads, causing deadlocks on any IO in the child.
#[cfg(feature = "threading")]
unsafe {
crate::stdlib::_io::reinit_std_streams_after_fork(vm)
};
// Phase 2: Reset low-level atomic state (no locks needed).
crate::signal::clear_after_fork();
crate::stdlib::_signal::_signal::clear_wakeup_fd_after_fork();
#[cfg(any(
target_os = "macos",
target_os = "ios",
target_os = "freebsd",
target_os = "netbsd",
target_os = "openbsd",
target_os = "dragonfly",
))]
rustpython_host_env::select::kqueue::mark_closed_after_fork();
// Reset weakref stripe locks that may have been held during fork.
#[cfg(feature = "threading")]
crate::object::reset_weakref_locks_after_fork();
// Repair any type-cache entries left mid-update at fork time.
unsafe { crate::builtins::type_::type_cache_after_fork() };
// Reset QSBR: dead parent threads' slots would stall reclamation
// forever, and retired memory can be freed immediately in the
// single-threaded child.
#[cfg(feature = "threading")]
unsafe {
crate::object::qsbr::QSBR.reset_after_fork()
};
// Phase 3: Clean up thread state. Locks are now reinit'd so we can
// acquire them normally instead of using try_lock().
#[cfg(feature = "threading")]
crate::stdlib::_thread::after_fork_child(vm);
// CPython parity: reinit import lock ownership metadata in child
// and release the lock acquired by PyOS_BeforeFork().
#[cfg(feature = "threading")]
unsafe {
crate::stdlib::_imp::after_fork_child_imp_lock_release()
};
// Initialize signal handlers for the child's main thread.
// When forked from a worker thread, the OnceCell is empty.
vm.signal_handlers
.get_or_init(crate::signal::SignalHandlers::default);
// Phase 4: Run Python-level at-fork callbacks.
let after_forkers_child: Vec<PyObjectRef> = vm.state.after_forkers_child.lock().clone();
run_at_forkers(after_forkers_child, false, vm);
}
/// Reset all parking_lot-based locks in the interpreter state after fork().
///
/// After fork(), only the calling thread survives. Any locks held by other
/// (now-dead) threads would cause deadlocks. We unconditionally reset them
/// to unlocked by zeroing the raw lock bytes.
#[cfg(all(unix, feature = "threading"))]
fn reinit_locks_after_fork(vm: &VirtualMachine) {
use rustpython_common::lock::reinit_mutex_after_fork;
unsafe {
// PyGlobalState PyMutex locks
reinit_mutex_after_fork(&vm.state.before_forkers);
reinit_mutex_after_fork(&vm.state.after_forkers_child);
reinit_mutex_after_fork(&vm.state.after_forkers_parent);
reinit_mutex_after_fork(&vm.state.atexit_funcs);
reinit_mutex_after_fork(&vm.state.global_trace_func);
reinit_mutex_after_fork(&vm.state.global_profile_func);
reinit_mutex_after_fork(&vm.state.type_mutex);
reinit_mutex_after_fork(&vm.state.monitoring);
// PyGlobalState parking_lot::Mutex locks
reinit_mutex_after_fork(&vm.state.thread_frames);
reinit_mutex_after_fork(&vm.state.thread_handles);
reinit_mutex_after_fork(&vm.state.shutdown_handles);
// Context-level RwLock
vm.ctx.string_pool.reinit_after_fork();
// Codec registry RwLock
vm.state.codec_registry.reinit_after_fork();
// GC state (multiple Mutex + RwLock), shared lists and this
// interpreter's own policy state.
crate::gc_state::gc_state().reinit_after_fork();
vm.state.gc.reinit_after_fork();
// Import lock (RawReentrantMutex<RawMutex, RawThreadId>)
crate::stdlib::_imp::reinit_imp_lock_after_fork();
}
}
/// Repair every live interpreter other than the forking one after `fork()`.
///
/// Only the forking thread survives, so each other interpreter is left with
/// slots for threads that no longer exist (still ATTACHED if they were
/// running bytecode) and possibly locks or stop-the-world flags held by
/// them. Since a collection stops all interpreters, that state would hang
/// the child's first collection.
///
/// # Safety
/// Must only be called after `fork()` in the child, when no other threads exist.
#[cfg(all(unix, feature = "threading"))]
fn reinit_other_interpreters_after_fork(vm: &VirtualMachine) {
use rustpython_common::lock::reinit_mutex_after_fork;
for state in crate::vm::runtime::live_interpreter_states() {
if state.interpreter_id == vm.state.interpreter_id {
continue;
}
unsafe {
reinit_mutex_after_fork(&state.before_forkers);
reinit_mutex_after_fork(&state.after_forkers_child);
reinit_mutex_after_fork(&state.after_forkers_parent);
reinit_mutex_after_fork(&state.atexit_funcs);
reinit_mutex_after_fork(&state.global_trace_func);
reinit_mutex_after_fork(&state.global_profile_func);
reinit_mutex_after_fork(&state.type_mutex);
reinit_mutex_after_fork(&state.monitoring);
reinit_mutex_after_fork(&state.thread_frames);
reinit_mutex_after_fork(&state.thread_handles);
reinit_mutex_after_fork(&state.shutdown_handles);
state.codec_registry.reinit_after_fork();
state.gc.reinit_after_fork();
}
state.stop_the_world.reset_after_fork();
// Every thread registered here belongs to the parent, including any
// slot the forking thread itself registered before the fork.
state.thread_frames.lock().clear();
state.thread_handles.lock().clear();
state.shutdown_handles.lock().clear();
}
crate::vm::thread::purge_other_interpreter_slots_after_fork(vm.state.interpreter_id);
}
fn py_os_after_fork_parent(vm: &VirtualMachine) {
#[cfg(feature = "threading")]
vm.state.stop_the_world.start_the_world(&vm.state);
#[cfg(feature = "threading")]
crate::stdlib::_imp::release_imp_lock_after_fork_parent();
let after_forkers_parent: Vec<PyObjectRef> = vm.state.after_forkers_parent.lock().clone();
run_at_forkers(after_forkers_parent, false, vm);
}
/// Best-effort number of OS threads in this process.
/// Returns <= 0 when unavailable.
fn get_number_of_os_threads() -> isize {
rustpython_host_env::posix::get_number_of_os_threads()
}
/// Warn if forking from a multi-threaded process.
/// `num_os_threads` should be captured before parent after-fork hooks run.
fn warn_if_multi_threaded(name: &str, num_os_threads: isize, vm: &VirtualMachine) {
let num_threads = if num_os_threads > 0 {
num_os_threads as usize
} else {
// CPython fallback: if OS-level count isn't available, use the
// threading module's active+limbo view.
// Only check threading if it was already imported. Avoid vm.import()
// which can execute arbitrary Python code in the fork path.
let threading = match vm
.sys_module
.get_attr("modules", vm)
.and_then(|m| m.get_item("threading", vm))
{
Ok(m) => m,
Err(_) => return,
};
let active = threading.get_attr("_active", vm).ok();
let limbo = threading.get_attr("_limbo", vm).ok();
// Match threading module internals and avoid sequence overcounting:
// count only dict-backed _active/_limbo containers.
let count_dict = |obj: Option<crate::PyObjectRef>| -> usize {
obj.and_then(|o| {
o.downcast_ref::<crate::builtins::PyDict>()
.map(|d| d.__len__())
})
.unwrap_or(0)
};
count_dict(active) + count_dict(limbo)
};
if num_threads > 1 {
let pid = rustpython_host_env::posix::getpid();
let msg = format!(
"This process (pid={pid}) is multi-threaded, use of {name}() may lead to deadlocks in the child."
);
// Match PyErr_WarnFormat(..., stacklevel=1) in CPython.
// Best effort: ignore failures like CPython does in this path.
let _ =
crate::stdlib::_warnings::warn(vm.ctx.exceptions.deprecation_warning, msg, 1, vm);
}
}
#[pyfunction]
fn fork(vm: &VirtualMachine) -> PyResult<i32> {
if vm
.state
.finalizing
.load(core::sync::atomic::Ordering::Acquire)
{
return Err(vm.new_exception_msg(
vm.ctx.exceptions.python_finalization_error.to_owned(),
"can't fork at interpreter shutdown".into(),
));
}
if !vm.state.allow_fork() {
return Err(
vm.new_runtime_error("fork not supported for isolated subinterpreters".to_owned())
);
}
// RustPython does not yet have C-level audit hooks; call sys.audit()
// to preserve Python-visible behavior and failure semantics.
vm.sys_module
.get_attr("audit", vm)?
.call(("os.fork",), vm)?;
py_os_before_fork(vm);
let pid = rustpython_host_env::posix::fork();
match pid {
Ok(0) => {
py_os_after_fork_child(vm);
Ok(0)
}
Ok(pid) => {
// Match CPython timing: capture this before parent after-fork hooks
// in case those hooks start threads.
let num_os_threads = get_number_of_os_threads();
py_os_after_fork_parent(vm);
// Match CPython timing: warn only after parent callback path resumes world.
warn_if_multi_threaded("fork", num_os_threads, vm);
Ok(pid)
}
Err(err) => Err(err.into_pyexception(vm)),
}
}
#[cfg(not(target_os = "redox"))]
const MKNOD_DIR_FD: bool = cfg!(not(target_vendor = "apple"));
#[cfg(not(target_os = "redox"))]
#[derive(FromArgs)]
struct MknodArgs<'fd> {
#[pyarg(any)]
path: OsPath,
#[pyarg(any)]
mode: libc::mode_t,
#[pyarg(any)]
device: libc::dev_t,
#[pyarg(flatten)]
dir_fd: DirFd<'fd, { MKNOD_DIR_FD as usize }>,
}
#[cfg(not(target_os = "redox"))]
impl MknodArgs<'_> {
#[cfg(not(target_vendor = "apple"))]
fn mknod(self, vm: &VirtualMachine) -> PyResult<()> {
let c_path = self.path.clone().into_cstring(vm)?;
match self.dir_fd.raw_opt() {
None => rustpython_host_env::posix::mknod(&c_path, self.mode, self.device),
Some(non_default_fd) => rustpython_host_env::posix::mknodat(
non_default_fd,
&c_path,
self.mode,
self.device,
),
}
.map_err(|err| err.into_pyexception(vm))
}
#[cfg(target_vendor = "apple")]
fn mknod(self, vm: &VirtualMachine) -> PyResult<()> {
let [] = self.dir_fd.0;
let c_path = self.path.clone().into_cstring(vm)?;
rustpython_host_env::posix::mknod(&c_path, self.mode, self.device)
.map_err(|err| err.into_pyexception(vm))
}
}
#[cfg(not(target_os = "redox"))]
#[pyfunction]
fn mknod(args: MknodArgs<'_>, vm: &VirtualMachine) -> PyResult<()> {
args.mknod(vm)
}
#[cfg(not(target_os = "redox"))]
#[pyfunction]
fn nice(increment: i32, vm: &VirtualMachine) -> PyResult<i32> {
rustpython_host_env::posix::nice(increment).map_err(|err| err.into_pyexception(vm))
}
#[cfg(not(target_os = "redox"))]
#[pyfunction]
fn sched_get_priority_max(policy: i32, vm: &VirtualMachine) -> PyResult<i32> {
rustpython_host_env::posix::sched_get_priority_max(policy)
.map_err(|err| err.into_pyexception(vm))
}
#[cfg(not(target_os = "redox"))]
#[pyfunction]
fn sched_get_priority_min(policy: i32, vm: &VirtualMachine) -> PyResult<i32> {
rustpython_host_env::posix::sched_get_priority_min(policy)
.map_err(|err| err.into_pyexception(vm))
}
#[pyfunction]
fn sched_yield(vm: &VirtualMachine) -> PyResult<()> {
rustpython_host_env::posix::sched_yield().map_err(|e| e.into_pyexception(vm))
}
#[pyfunction]
fn get_inheritable(fd: BorrowedFd<'_>, vm: &VirtualMachine) -> PyResult<bool> {
rustpython_host_env::fcntl::get_inheritable(fd).map_err(|err| err.into_pyexception(vm))
}
#[pyfunction]
fn set_inheritable(fd: BorrowedFd<'_>, inheritable: bool, vm: &VirtualMachine) -> PyResult<()> {
super::set_inheritable(fd, inheritable).map_err(|err| err.into_pyexception(vm))
}
#[pyfunction]
fn get_blocking(fd: BorrowedFd<'_>, vm: &VirtualMachine) -> PyResult<bool> {
rustpython_host_env::fcntl::get_blocking(fd).map_err(|err| err.into_pyexception(vm))
}
#[pyfunction]
fn set_blocking(fd: BorrowedFd<'_>, blocking: bool, vm: &VirtualMachine) -> PyResult<()> {
rustpython_host_env::fcntl::set_blocking(fd, blocking)
.map_err(|err| err.into_pyexception(vm))
}
#[pyfunction]
fn pipe(vm: &VirtualMachine) -> PyResult<(OwnedFd, OwnedFd)> {
rustpython_host_env::posix::pipe().map_err(|err| err.into_pyexception(vm))
}
// cfg from nix
#[cfg(any(
target_os = "android",
target_os = "dragonfly",
target_os = "emscripten",
target_os = "freebsd",
target_os = "linux",
target_os = "netbsd",
target_os = "openbsd"
))]
#[pyfunction]
fn pipe2(flags: libc::c_int, vm: &VirtualMachine) -> PyResult<(OwnedFd, OwnedFd)> {
rustpython_host_env::posix::pipe2(flags).map_err(|err| err.into_pyexception(vm))
}
fn _chmod(
path: OsPath,
dir_fd: DirFd<'_, 0>,
mode: u32,
follow_symlinks: FollowSymlinks,
vm: &VirtualMachine,
) -> PyResult<()> {
let [] = dir_fd.0;
let err_path = path.clone();
let body = move || {
use std::os::unix::fs::PermissionsExt;
let meta = fs_metadata(&path, follow_symlinks.0)?;
let mut permissions = meta.permissions();
permissions.set_mode(mode);
fs::set_permissions(&path, permissions)
};