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use crate::fmt;
use crate::io::{self, Error, ErrorKind};
use crate::mem;
use crate::num::NonZeroI32;
use crate::ptr;
use crate::sys;
use crate::sys::cvt;
use crate::sys::process::process_common::*;
use core::ffi::NonZero_c_int;
#[cfg(target_os = "linux")]
use crate::os::linux::process::PidFd;
#[cfg(target_os = "linux")]
use crate::sys::weak::raw_syscall;
#[cfg(any(
target_os = "macos",
target_os = "freebsd",
all(target_os = "linux", target_env = "gnu"),
all(target_os = "linux", target_env = "musl"),
))]
use crate::sys::weak::weak;
#[cfg(target_os = "vxworks")]
use libc::RTP_ID as pid_t;
#[cfg(not(target_os = "vxworks"))]
use libc::{c_int, pid_t};
#[cfg(not(any(target_os = "vxworks", target_os = "l4re")))]
use libc::{gid_t, uid_t};
impl Command {
pub fn spawn(
&mut self,
default: Stdio,
needs_stdin: bool,
) -> io::Result<(Process, StdioPipes)> {
const CLOEXEC_MSG_FOOTER: [u8; 4] = *b"NOEX";
let envp = self.capture_env();
if self.saw_nul() {
return Err(io::const_io_error!(
ErrorKind::InvalidInput,
"nul byte found in provided data",
));
}
let (ours, theirs) = self.setup_io(default, needs_stdin)?;
if let Some(ret) = self.posix_spawn(&theirs, envp.as_ref())? {
return Ok((ret, ours));
}
let (input, output) = sys::pipe::anon_pipe()?;
let env_lock = sys::os::env_read_lock();
let (pid, pidfd) = unsafe { self.do_fork()? };
if pid == 0 {
crate::panic::always_abort();
mem::forget(env_lock);
drop(input);
let Err(err) = unsafe { self.do_exec(theirs, envp.as_ref()) };
let errno = err.raw_os_error().unwrap_or(libc::EINVAL) as u32;
let errno = errno.to_be_bytes();
let bytes = [
errno[0],
errno[1],
errno[2],
errno[3],
CLOEXEC_MSG_FOOTER[0],
CLOEXEC_MSG_FOOTER[1],
CLOEXEC_MSG_FOOTER[2],
CLOEXEC_MSG_FOOTER[3],
];
rtassert!(output.write(&bytes).is_ok());
unsafe { libc::_exit(1) }
}
drop(env_lock);
drop(output);
let mut p = unsafe { Process::new(pid, pidfd) };
let mut bytes = [0; 8];
loop {
match input.read(&mut bytes) {
Ok(0) => return Ok((p, ours)),
Ok(8) => {
let (errno, footer) = bytes.split_at(4);
assert_eq!(
CLOEXEC_MSG_FOOTER, footer,
"Validation on the CLOEXEC pipe failed: {:?}",
bytes
);
let errno = i32::from_be_bytes(errno.try_into().unwrap());
assert!(p.wait().is_ok(), "wait() should either return Ok or panic");
return Err(Error::from_raw_os_error(errno));
}
Err(ref e) if e.kind() == ErrorKind::Interrupted => {}
Err(e) => {
assert!(p.wait().is_ok(), "wait() should either return Ok or panic");
panic!("the CLOEXEC pipe failed: {e:?}")
}
Ok(..) => {
assert!(p.wait().is_ok(), "wait() should either return Ok or panic");
panic!("short read on the CLOEXEC pipe")
}
}
}
}
#[cfg(not(target_os = "linux"))]
unsafe fn do_fork(&mut self) -> Result<(pid_t, pid_t), io::Error> {
cvt(libc::fork()).map(|res| (res, -1))
}
#[cfg(target_os = "linux")]
unsafe fn do_fork(&mut self) -> Result<(pid_t, pid_t), io::Error> {
use crate::sync::atomic::{AtomicBool, Ordering};
static HAS_CLONE3: AtomicBool = AtomicBool::new(true);
const CLONE_PIDFD: u64 = 0x00001000;
#[repr(C)]
struct clone_args {
flags: u64,
pidfd: u64,
child_tid: u64,
parent_tid: u64,
exit_signal: u64,
stack: u64,
stack_size: u64,
tls: u64,
set_tid: u64,
set_tid_size: u64,
cgroup: u64,
}
raw_syscall! {
fn clone3(cl_args: *mut clone_args, len: libc::size_t) -> libc::c_long
}
let want_clone3_pidfd = self.get_create_pidfd();
let mut pidfd: pid_t = -1;
if want_clone3_pidfd && HAS_CLONE3.load(Ordering::Relaxed) {
let mut args = clone_args {
flags: CLONE_PIDFD,
pidfd: &mut pidfd as *mut pid_t as u64,
child_tid: 0,
parent_tid: 0,
exit_signal: libc::SIGCHLD as u64,
stack: 0,
stack_size: 0,
tls: 0,
set_tid: 0,
set_tid_size: 0,
cgroup: 0,
};
let args_ptr = &mut args as *mut clone_args;
let args_size = crate::mem::size_of::<clone_args>();
let res = cvt(clone3(args_ptr, args_size));
match res {
Ok(n) => return Ok((n as pid_t, pidfd)),
Err(e) => match e.raw_os_error() {
Some(libc::ENOSYS) => HAS_CLONE3.store(false, Ordering::Relaxed),
Some(libc::EPERM) => {}
_ => return Err(e),
},
}
}
cvt(libc::fork()).map(|res| (res, pidfd))
}
pub fn exec(&mut self, default: Stdio) -> io::Error {
let envp = self.capture_env();
if self.saw_nul() {
return io::const_io_error!(ErrorKind::InvalidInput, "nul byte found in provided data",);
}
match self.setup_io(default, true) {
Ok((_, theirs)) => {
unsafe {
let _lock = sys::os::env_read_lock();
let Err(e) = self.do_exec(theirs, envp.as_ref());
e
}
}
Err(e) => e,
}
}
unsafe fn do_exec(
&mut self,
stdio: ChildPipes,
maybe_envp: Option<&CStringArray>,
) -> Result<!, io::Error> {
use crate::sys::{self, cvt_r};
if let Some(fd) = stdio.stdin.fd() {
cvt_r(|| libc::dup2(fd, libc::STDIN_FILENO))?;
}
if let Some(fd) = stdio.stdout.fd() {
cvt_r(|| libc::dup2(fd, libc::STDOUT_FILENO))?;
}
if let Some(fd) = stdio.stderr.fd() {
cvt_r(|| libc::dup2(fd, libc::STDERR_FILENO))?;
}
#[cfg(not(target_os = "l4re"))]
{
if let Some(_g) = self.get_groups() {
#[cfg(not(target_os = "redox"))]
cvt(libc::setgroups(_g.len().try_into().unwrap(), _g.as_ptr()))?;
}
if let Some(u) = self.get_gid() {
cvt(libc::setgid(u as gid_t))?;
}
if let Some(u) = self.get_uid() {
#[cfg(not(target_os = "redox"))]
if libc::getuid() == 0 && self.get_groups().is_none() {
cvt(libc::setgroups(0, ptr::null()))?;
}
cvt(libc::setuid(u as uid_t))?;
}
}
if let Some(ref cwd) = *self.get_cwd() {
cvt(libc::chdir(cwd.as_ptr()))?;
}
if let Some(pgroup) = self.get_pgroup() {
cvt(libc::setpgid(0, pgroup))?;
}
#[cfg(not(target_os = "emscripten"))]
{
use crate::mem::MaybeUninit;
use crate::sys::cvt_nz;
let mut set = MaybeUninit::<libc::sigset_t>::uninit();
cvt(sigemptyset(set.as_mut_ptr()))?;
cvt_nz(libc::pthread_sigmask(libc::SIG_SETMASK, set.as_ptr(), ptr::null_mut()))?;
#[cfg(target_os = "android")]
{
let mut action: libc::sigaction = mem::zeroed();
action.sa_sigaction = libc::SIG_DFL;
cvt(libc::sigaction(libc::SIGPIPE, &action, ptr::null_mut()))?;
}
#[cfg(not(target_os = "android"))]
{
let ret = sys::signal(libc::SIGPIPE, libc::SIG_DFL);
if ret == libc::SIG_ERR {
return Err(io::Error::last_os_error());
}
}
}
for callback in self.get_closures().iter_mut() {
callback()?;
}
let mut _reset = None;
if let Some(envp) = maybe_envp {
struct Reset(*const *const libc::c_char);
impl Drop for Reset {
fn drop(&mut self) {
unsafe {
*sys::os::environ() = self.0;
}
}
}
_reset = Some(Reset(*sys::os::environ()));
*sys::os::environ() = envp.as_ptr();
}
libc::execvp(self.get_program_cstr().as_ptr(), self.get_argv().as_ptr());
Err(io::Error::last_os_error())
}
#[cfg(not(any(
target_os = "macos",
target_os = "freebsd",
all(target_os = "linux", target_env = "gnu"),
all(target_os = "linux", target_env = "musl"),
)))]
fn posix_spawn(
&mut self,
_: &ChildPipes,
_: Option<&CStringArray>,
) -> io::Result<Option<Process>> {
Ok(None)
}
#[cfg(any(
target_os = "macos",
target_os = "freebsd",
all(target_os = "linux", target_env = "gnu"),
all(target_os = "linux", target_env = "musl"),
))]
fn posix_spawn(
&mut self,
stdio: &ChildPipes,
envp: Option<&CStringArray>,
) -> io::Result<Option<Process>> {
use crate::mem::MaybeUninit;
use crate::sys::{self, cvt_nz};
if self.get_gid().is_some()
|| self.get_uid().is_some()
|| (self.env_saw_path() && !self.program_is_path())
|| !self.get_closures().is_empty()
|| self.get_groups().is_some()
|| self.get_create_pidfd()
{
return Ok(None);
}
#[cfg(all(target_os = "linux", target_env = "gnu"))]
{
if let Some(version) = sys::os::glibc_version() {
if version < (2, 24) {
return Ok(None);
}
} else {
return Ok(None);
}
}
weak! {
fn posix_spawn_file_actions_addchdir_np(
*mut libc::posix_spawn_file_actions_t,
*const libc::c_char
) -> libc::c_int
}
let addchdir = match self.get_cwd() {
Some(cwd) => {
if cfg!(target_os = "macos") {
return Ok(None);
}
match posix_spawn_file_actions_addchdir_np.get() {
Some(f) => Some((f, cwd)),
None => return Ok(None),
}
}
None => None,
};
let pgroup = self.get_pgroup();
let mut p = unsafe { Process::new(0, -1) };
struct PosixSpawnFileActions<'a>(&'a mut MaybeUninit<libc::posix_spawn_file_actions_t>);
impl Drop for PosixSpawnFileActions<'_> {
fn drop(&mut self) {
unsafe {
libc::posix_spawn_file_actions_destroy(self.0.as_mut_ptr());
}
}
}
struct PosixSpawnattr<'a>(&'a mut MaybeUninit<libc::posix_spawnattr_t>);
impl Drop for PosixSpawnattr<'_> {
fn drop(&mut self) {
unsafe {
libc::posix_spawnattr_destroy(self.0.as_mut_ptr());
}
}
}
unsafe {
let mut attrs = MaybeUninit::uninit();
cvt_nz(libc::posix_spawnattr_init(attrs.as_mut_ptr()))?;
let attrs = PosixSpawnattr(&mut attrs);
let mut flags = 0;
let mut file_actions = MaybeUninit::uninit();
cvt_nz(libc::posix_spawn_file_actions_init(file_actions.as_mut_ptr()))?;
let file_actions = PosixSpawnFileActions(&mut file_actions);
if let Some(fd) = stdio.stdin.fd() {
cvt_nz(libc::posix_spawn_file_actions_adddup2(
file_actions.0.as_mut_ptr(),
fd,
libc::STDIN_FILENO,
))?;
}
if let Some(fd) = stdio.stdout.fd() {
cvt_nz(libc::posix_spawn_file_actions_adddup2(
file_actions.0.as_mut_ptr(),
fd,
libc::STDOUT_FILENO,
))?;
}
if let Some(fd) = stdio.stderr.fd() {
cvt_nz(libc::posix_spawn_file_actions_adddup2(
file_actions.0.as_mut_ptr(),
fd,
libc::STDERR_FILENO,
))?;
}
if let Some((f, cwd)) = addchdir {
cvt_nz(f(file_actions.0.as_mut_ptr(), cwd.as_ptr()))?;
}
if let Some(pgroup) = pgroup {
flags |= libc::POSIX_SPAWN_SETPGROUP;
cvt_nz(libc::posix_spawnattr_setpgroup(attrs.0.as_mut_ptr(), pgroup))?;
}
let mut set = MaybeUninit::<libc::sigset_t>::uninit();
cvt(sigemptyset(set.as_mut_ptr()))?;
cvt_nz(libc::posix_spawnattr_setsigmask(attrs.0.as_mut_ptr(), set.as_ptr()))?;
cvt(sigaddset(set.as_mut_ptr(), libc::SIGPIPE))?;
cvt_nz(libc::posix_spawnattr_setsigdefault(attrs.0.as_mut_ptr(), set.as_ptr()))?;
flags |= libc::POSIX_SPAWN_SETSIGDEF | libc::POSIX_SPAWN_SETSIGMASK;
cvt_nz(libc::posix_spawnattr_setflags(attrs.0.as_mut_ptr(), flags as _))?;
let _env_lock = sys::os::env_read_lock();
let envp = envp.map(|c| c.as_ptr()).unwrap_or_else(|| *sys::os::environ() as *const _);
cvt_nz(libc::posix_spawnp(
&mut p.pid,
self.get_program_cstr().as_ptr(),
file_actions.0.as_ptr(),
attrs.0.as_ptr(),
self.get_argv().as_ptr() as *const _,
envp as *const _,
))?;
Ok(Some(p))
}
}
}
pub struct Process {
pid: pid_t,
status: Option<ExitStatus>,
#[cfg(target_os = "linux")]
pidfd: Option<PidFd>,
}
impl Process {
#[cfg(target_os = "linux")]
unsafe fn new(pid: pid_t, pidfd: pid_t) -> Self {
use crate::os::unix::io::FromRawFd;
use crate::sys_common::FromInner;
let pidfd = (pidfd >= 0).then(|| PidFd::from_inner(sys::fd::FileDesc::from_raw_fd(pidfd)));
Process { pid, status: None, pidfd }
}
#[cfg(not(target_os = "linux"))]
unsafe fn new(pid: pid_t, _pidfd: pid_t) -> Self {
Process { pid, status: None }
}
pub fn id(&self) -> u32 {
self.pid as u32
}
pub fn kill(&mut self) -> io::Result<()> {
if self.status.is_some() {
Err(io::const_io_error!(
ErrorKind::InvalidInput,
"invalid argument: can't kill an exited process",
))
} else {
cvt(unsafe { libc::kill(self.pid, libc::SIGKILL) }).map(drop)
}
}
pub fn wait(&mut self) -> io::Result<ExitStatus> {
use crate::sys::cvt_r;
if let Some(status) = self.status {
return Ok(status);
}
let mut status = 0 as c_int;
cvt_r(|| unsafe { libc::waitpid(self.pid, &mut status, 0) })?;
self.status = Some(ExitStatus::new(status));
Ok(ExitStatus::new(status))
}
pub fn try_wait(&mut self) -> io::Result<Option<ExitStatus>> {
if let Some(status) = self.status {
return Ok(Some(status));
}
let mut status = 0 as c_int;
let pid = cvt(unsafe { libc::waitpid(self.pid, &mut status, libc::WNOHANG) })?;
if pid == 0 {
Ok(None)
} else {
self.status = Some(ExitStatus::new(status));
Ok(Some(ExitStatus::new(status)))
}
}
}
#[derive(PartialEq, Eq, Clone, Copy)]
pub struct ExitStatus(c_int);
impl fmt::Debug for ExitStatus {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.debug_tuple("unix_wait_status").field(&self.0).finish()
}
}
impl ExitStatus {
pub fn new(status: c_int) -> ExitStatus {
ExitStatus(status)
}
fn exited(&self) -> bool {
libc::WIFEXITED(self.0)
}
pub fn exit_ok(&self) -> Result<(), ExitStatusError> {
match NonZero_c_int::try_from(self.0) {
Ok(failure) => Err(ExitStatusError(failure)),
Err(_) => Ok(()),
}
}
pub fn code(&self) -> Option<i32> {
self.exited().then(|| libc::WEXITSTATUS(self.0))
}
pub fn signal(&self) -> Option<i32> {
libc::WIFSIGNALED(self.0).then(|| libc::WTERMSIG(self.0))
}
pub fn core_dumped(&self) -> bool {
libc::WIFSIGNALED(self.0) && libc::WCOREDUMP(self.0)
}
pub fn stopped_signal(&self) -> Option<i32> {
libc::WIFSTOPPED(self.0).then(|| libc::WSTOPSIG(self.0))
}
pub fn continued(&self) -> bool {
libc::WIFCONTINUED(self.0)
}
pub fn into_raw(&self) -> c_int {
self.0
}
}
impl From<c_int> for ExitStatus {
fn from(a: c_int) -> ExitStatus {
ExitStatus(a)
}
}
fn signal_string(signal: i32) -> &'static str {
match signal {
libc::SIGHUP => " (SIGHUP)",
libc::SIGINT => " (SIGINT)",
libc::SIGQUIT => " (SIGQUIT)",
libc::SIGILL => " (SIGILL)",
libc::SIGTRAP => " (SIGTRAP)",
libc::SIGABRT => " (SIGABRT)",
libc::SIGBUS => " (SIGBUS)",
libc::SIGFPE => " (SIGFPE)",
libc::SIGKILL => " (SIGKILL)",
libc::SIGUSR1 => " (SIGUSR1)",
libc::SIGSEGV => " (SIGSEGV)",
libc::SIGUSR2 => " (SIGUSR2)",
libc::SIGPIPE => " (SIGPIPE)",
libc::SIGALRM => " (SIGALRM)",
libc::SIGTERM => " (SIGTERM)",
libc::SIGCHLD => " (SIGCHLD)",
libc::SIGCONT => " (SIGCONT)",
libc::SIGSTOP => " (SIGSTOP)",
libc::SIGTSTP => " (SIGTSTP)",
libc::SIGTTIN => " (SIGTTIN)",
libc::SIGTTOU => " (SIGTTOU)",
libc::SIGURG => " (SIGURG)",
libc::SIGXCPU => " (SIGXCPU)",
libc::SIGXFSZ => " (SIGXFSZ)",
libc::SIGVTALRM => " (SIGVTALRM)",
libc::SIGPROF => " (SIGPROF)",
libc::SIGWINCH => " (SIGWINCH)",
#[cfg(not(target_os = "haiku"))]
libc::SIGIO => " (SIGIO)",
libc::SIGSYS => " (SIGSYS)",
#[cfg(all(
target_os = "linux",
any(
target_arch = "x86_64",
target_arch = "x86",
target_arch = "arm",
target_arch = "aarch64"
)
))]
libc::SIGSTKFLT => " (SIGSTKFLT)",
#[cfg(target_os = "linux")]
libc::SIGPWR => " (SIGPWR)",
#[cfg(any(
target_os = "macos",
target_os = "ios",
target_os = "tvos",
target_os = "freebsd",
target_os = "netbsd",
target_os = "openbsd",
target_os = "dragonfly"
))]
libc::SIGEMT => " (SIGEMT)",
#[cfg(any(
target_os = "macos",
target_os = "ios",
target_os = "tvos",
target_os = "freebsd",
target_os = "netbsd",
target_os = "openbsd",
target_os = "dragonfly"
))]
libc::SIGINFO => " (SIGINFO)",
_ => "",
}
}
impl fmt::Display for ExitStatus {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
if let Some(code) = self.code() {
write!(f, "exit status: {code}")
} else if let Some(signal) = self.signal() {
let signal_string = signal_string(signal);
if self.core_dumped() {
write!(f, "signal: {signal}{signal_string} (core dumped)")
} else {
write!(f, "signal: {signal}{signal_string}")
}
} else if let Some(signal) = self.stopped_signal() {
let signal_string = signal_string(signal);
write!(f, "stopped (not terminated) by signal: {signal}{signal_string}")
} else if self.continued() {
write!(f, "continued (WIFCONTINUED)")
} else {
write!(f, "unrecognised wait status: {} {:#x}", self.0, self.0)
}
}
}
#[derive(PartialEq, Eq, Clone, Copy)]
pub struct ExitStatusError(NonZero_c_int);
impl Into<ExitStatus> for ExitStatusError {
fn into(self) -> ExitStatus {
ExitStatus(self.0.into())
}
}
impl fmt::Debug for ExitStatusError {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.debug_tuple("unix_wait_status").field(&self.0).finish()
}
}
impl ExitStatusError {
pub fn code(self) -> Option<NonZeroI32> {
ExitStatus(self.0.into()).code().map(|st| st.try_into().unwrap())
}
}
#[cfg(target_os = "linux")]
#[unstable(feature = "linux_pidfd", issue = "82971")]
impl crate::os::linux::process::ChildExt for crate::process::Child {
fn pidfd(&self) -> io::Result<&PidFd> {
self.handle
.pidfd
.as_ref()
.ok_or_else(|| Error::new(ErrorKind::Other, "No pidfd was created."))
}
fn take_pidfd(&mut self) -> io::Result<PidFd> {
self.handle
.pidfd
.take()
.ok_or_else(|| Error::new(ErrorKind::Other, "No pidfd was created."))
}
}
#[cfg(test)]
#[path = "process_unix/tests.rs"]
mod tests;