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-rw-r--r--library/std/src/sys/unix/process/mod.rs24
-rw-r--r--library/std/src/sys/unix/process/process_common.rs523
-rw-r--r--library/std/src/sys/unix/process/process_common/tests.rs124
-rw-r--r--library/std/src/sys/unix/process/process_fuchsia.rs327
-rw-r--r--library/std/src/sys/unix/process/process_unix.rs836
-rw-r--r--library/std/src/sys/unix/process/process_unix/tests.rs62
-rw-r--r--library/std/src/sys/unix/process/process_unsupported.rs118
-rw-r--r--library/std/src/sys/unix/process/process_vxworks.rs262
-rw-r--r--library/std/src/sys/unix/process/zircon.rs309
9 files changed, 2585 insertions, 0 deletions
diff --git a/library/std/src/sys/unix/process/mod.rs b/library/std/src/sys/unix/process/mod.rs
new file mode 100644
index 000000000..3701510f3
--- /dev/null
+++ b/library/std/src/sys/unix/process/mod.rs
@@ -0,0 +1,24 @@
+pub use self::process_common::{Command, CommandArgs, ExitCode, Stdio, StdioPipes};
+pub use self::process_inner::{ExitStatus, ExitStatusError, Process};
+pub use crate::ffi::OsString as EnvKey;
+pub use crate::sys_common::process::CommandEnvs;
+
+#[cfg_attr(any(target_os = "espidf", target_os = "horizon"), allow(unused))]
+mod process_common;
+
+cfg_if::cfg_if! {
+ if #[cfg(target_os = "fuchsia")] {
+ #[path = "process_fuchsia.rs"]
+ mod process_inner;
+ mod zircon;
+ } else if #[cfg(target_os = "vxworks")] {
+ #[path = "process_vxworks.rs"]
+ mod process_inner;
+ } else if #[cfg(any(target_os = "espidf", target_os = "horizon"))] {
+ #[path = "process_unsupported.rs"]
+ mod process_inner;
+ } else {
+ #[path = "process_unix.rs"]
+ mod process_inner;
+ }
+}
diff --git a/library/std/src/sys/unix/process/process_common.rs b/library/std/src/sys/unix/process/process_common.rs
new file mode 100644
index 000000000..bca1b65a7
--- /dev/null
+++ b/library/std/src/sys/unix/process/process_common.rs
@@ -0,0 +1,523 @@
+#[cfg(all(test, not(target_os = "emscripten")))]
+mod tests;
+
+use crate::os::unix::prelude::*;
+
+use crate::collections::BTreeMap;
+use crate::ffi::{CStr, CString, OsStr, OsString};
+use crate::fmt;
+use crate::io;
+use crate::path::Path;
+use crate::ptr;
+use crate::sys::fd::FileDesc;
+use crate::sys::fs::File;
+use crate::sys::pipe::{self, AnonPipe};
+use crate::sys_common::process::{CommandEnv, CommandEnvs};
+use crate::sys_common::IntoInner;
+
+#[cfg(not(target_os = "fuchsia"))]
+use crate::sys::fs::OpenOptions;
+
+use libc::{c_char, c_int, gid_t, pid_t, uid_t, EXIT_FAILURE, EXIT_SUCCESS};
+
+cfg_if::cfg_if! {
+ if #[cfg(target_os = "fuchsia")] {
+ // fuchsia doesn't have /dev/null
+ } else if #[cfg(target_os = "redox")] {
+ const DEV_NULL: &str = "null:\0";
+ } else if #[cfg(target_os = "vxworks")] {
+ const DEV_NULL: &str = "/null\0";
+ } else {
+ const DEV_NULL: &str = "/dev/null\0";
+ }
+}
+
+// Android with api less than 21 define sig* functions inline, so it is not
+// available for dynamic link. Implementing sigemptyset and sigaddset allow us
+// to support older Android version (independent of libc version).
+// The following implementations are based on
+// https://github.com/aosp-mirror/platform_bionic/blob/ad8dcd6023294b646e5a8288c0ed431b0845da49/libc/include/android/legacy_signal_inlines.h
+cfg_if::cfg_if! {
+ if #[cfg(target_os = "android")] {
+ pub unsafe fn sigemptyset(set: *mut libc::sigset_t) -> libc::c_int {
+ set.write_bytes(0u8, 1);
+ return 0;
+ }
+ #[allow(dead_code)]
+ pub unsafe fn sigaddset(set: *mut libc::sigset_t, signum: libc::c_int) -> libc::c_int {
+ use crate::{slice, mem};
+
+ let raw = slice::from_raw_parts_mut(set as *mut u8, mem::size_of::<libc::sigset_t>());
+ let bit = (signum - 1) as usize;
+ raw[bit / 8] |= 1 << (bit % 8);
+ return 0;
+ }
+ } else {
+ pub use libc::{sigemptyset, sigaddset};
+ }
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// Command
+////////////////////////////////////////////////////////////////////////////////
+
+pub struct Command {
+ program: CString,
+ args: Vec<CString>,
+ /// Exactly what will be passed to `execvp`.
+ ///
+ /// First element is a pointer to `program`, followed by pointers to
+ /// `args`, followed by a `null`. Be careful when modifying `program` or
+ /// `args` to properly update this as well.
+ argv: Argv,
+ env: CommandEnv,
+
+ cwd: Option<CString>,
+ uid: Option<uid_t>,
+ gid: Option<gid_t>,
+ saw_nul: bool,
+ closures: Vec<Box<dyn FnMut() -> io::Result<()> + Send + Sync>>,
+ groups: Option<Box<[gid_t]>>,
+ stdin: Option<Stdio>,
+ stdout: Option<Stdio>,
+ stderr: Option<Stdio>,
+ #[cfg(target_os = "linux")]
+ create_pidfd: bool,
+ pgroup: Option<pid_t>,
+}
+
+// Create a new type for argv, so that we can make it `Send` and `Sync`
+struct Argv(Vec<*const c_char>);
+
+// It is safe to make `Argv` `Send` and `Sync`, because it contains
+// pointers to memory owned by `Command.args`
+unsafe impl Send for Argv {}
+unsafe impl Sync for Argv {}
+
+// passed back to std::process with the pipes connected to the child, if any
+// were requested
+pub struct StdioPipes {
+ pub stdin: Option<AnonPipe>,
+ pub stdout: Option<AnonPipe>,
+ pub stderr: Option<AnonPipe>,
+}
+
+// passed to do_exec() with configuration of what the child stdio should look
+// like
+pub struct ChildPipes {
+ pub stdin: ChildStdio,
+ pub stdout: ChildStdio,
+ pub stderr: ChildStdio,
+}
+
+pub enum ChildStdio {
+ Inherit,
+ Explicit(c_int),
+ Owned(FileDesc),
+
+ // On Fuchsia, null stdio is the default, so we simply don't specify
+ // any actions at the time of spawning.
+ #[cfg(target_os = "fuchsia")]
+ Null,
+}
+
+pub enum Stdio {
+ Inherit,
+ Null,
+ MakePipe,
+ Fd(FileDesc),
+}
+
+impl Command {
+ #[cfg(not(target_os = "linux"))]
+ pub fn new(program: &OsStr) -> Command {
+ let mut saw_nul = false;
+ let program = os2c(program, &mut saw_nul);
+ Command {
+ argv: Argv(vec![program.as_ptr(), ptr::null()]),
+ args: vec![program.clone()],
+ program,
+ env: Default::default(),
+ cwd: None,
+ uid: None,
+ gid: None,
+ saw_nul,
+ closures: Vec::new(),
+ groups: None,
+ stdin: None,
+ stdout: None,
+ stderr: None,
+ pgroup: None,
+ }
+ }
+
+ #[cfg(target_os = "linux")]
+ pub fn new(program: &OsStr) -> Command {
+ let mut saw_nul = false;
+ let program = os2c(program, &mut saw_nul);
+ Command {
+ argv: Argv(vec![program.as_ptr(), ptr::null()]),
+ args: vec![program.clone()],
+ program,
+ env: Default::default(),
+ cwd: None,
+ uid: None,
+ gid: None,
+ saw_nul,
+ closures: Vec::new(),
+ groups: None,
+ stdin: None,
+ stdout: None,
+ stderr: None,
+ create_pidfd: false,
+ pgroup: None,
+ }
+ }
+
+ pub fn set_arg_0(&mut self, arg: &OsStr) {
+ // Set a new arg0
+ let arg = os2c(arg, &mut self.saw_nul);
+ debug_assert!(self.argv.0.len() > 1);
+ self.argv.0[0] = arg.as_ptr();
+ self.args[0] = arg;
+ }
+
+ pub fn arg(&mut self, arg: &OsStr) {
+ // Overwrite the trailing null pointer in `argv` and then add a new null
+ // pointer.
+ let arg = os2c(arg, &mut self.saw_nul);
+ self.argv.0[self.args.len()] = arg.as_ptr();
+ self.argv.0.push(ptr::null());
+
+ // Also make sure we keep track of the owned value to schedule a
+ // destructor for this memory.
+ self.args.push(arg);
+ }
+
+ pub fn cwd(&mut self, dir: &OsStr) {
+ self.cwd = Some(os2c(dir, &mut self.saw_nul));
+ }
+ pub fn uid(&mut self, id: uid_t) {
+ self.uid = Some(id);
+ }
+ pub fn gid(&mut self, id: gid_t) {
+ self.gid = Some(id);
+ }
+ pub fn groups(&mut self, groups: &[gid_t]) {
+ self.groups = Some(Box::from(groups));
+ }
+ pub fn pgroup(&mut self, pgroup: pid_t) {
+ self.pgroup = Some(pgroup);
+ }
+
+ #[cfg(target_os = "linux")]
+ pub fn create_pidfd(&mut self, val: bool) {
+ self.create_pidfd = val;
+ }
+
+ #[cfg(not(target_os = "linux"))]
+ #[allow(dead_code)]
+ pub fn get_create_pidfd(&self) -> bool {
+ false
+ }
+
+ #[cfg(target_os = "linux")]
+ pub fn get_create_pidfd(&self) -> bool {
+ self.create_pidfd
+ }
+
+ pub fn saw_nul(&self) -> bool {
+ self.saw_nul
+ }
+
+ pub fn get_program(&self) -> &OsStr {
+ OsStr::from_bytes(self.program.as_bytes())
+ }
+
+ pub fn get_args(&self) -> CommandArgs<'_> {
+ let mut iter = self.args.iter();
+ iter.next();
+ CommandArgs { iter }
+ }
+
+ pub fn get_envs(&self) -> CommandEnvs<'_> {
+ self.env.iter()
+ }
+
+ pub fn get_current_dir(&self) -> Option<&Path> {
+ self.cwd.as_ref().map(|cs| Path::new(OsStr::from_bytes(cs.as_bytes())))
+ }
+
+ pub fn get_argv(&self) -> &Vec<*const c_char> {
+ &self.argv.0
+ }
+
+ pub fn get_program_cstr(&self) -> &CStr {
+ &*self.program
+ }
+
+ #[allow(dead_code)]
+ pub fn get_cwd(&self) -> &Option<CString> {
+ &self.cwd
+ }
+ #[allow(dead_code)]
+ pub fn get_uid(&self) -> Option<uid_t> {
+ self.uid
+ }
+ #[allow(dead_code)]
+ pub fn get_gid(&self) -> Option<gid_t> {
+ self.gid
+ }
+ #[allow(dead_code)]
+ pub fn get_groups(&self) -> Option<&[gid_t]> {
+ self.groups.as_deref()
+ }
+ #[allow(dead_code)]
+ pub fn get_pgroup(&self) -> Option<pid_t> {
+ self.pgroup
+ }
+
+ pub fn get_closures(&mut self) -> &mut Vec<Box<dyn FnMut() -> io::Result<()> + Send + Sync>> {
+ &mut self.closures
+ }
+
+ pub unsafe fn pre_exec(&mut self, f: Box<dyn FnMut() -> io::Result<()> + Send + Sync>) {
+ self.closures.push(f);
+ }
+
+ pub fn stdin(&mut self, stdin: Stdio) {
+ self.stdin = Some(stdin);
+ }
+
+ pub fn stdout(&mut self, stdout: Stdio) {
+ self.stdout = Some(stdout);
+ }
+
+ pub fn stderr(&mut self, stderr: Stdio) {
+ self.stderr = Some(stderr);
+ }
+
+ pub fn env_mut(&mut self) -> &mut CommandEnv {
+ &mut self.env
+ }
+
+ pub fn capture_env(&mut self) -> Option<CStringArray> {
+ let maybe_env = self.env.capture_if_changed();
+ maybe_env.map(|env| construct_envp(env, &mut self.saw_nul))
+ }
+
+ #[allow(dead_code)]
+ pub fn env_saw_path(&self) -> bool {
+ self.env.have_changed_path()
+ }
+
+ #[allow(dead_code)]
+ pub fn program_is_path(&self) -> bool {
+ self.program.to_bytes().contains(&b'/')
+ }
+
+ pub fn setup_io(
+ &self,
+ default: Stdio,
+ needs_stdin: bool,
+ ) -> io::Result<(StdioPipes, ChildPipes)> {
+ let null = Stdio::Null;
+ let default_stdin = if needs_stdin { &default } else { &null };
+ let stdin = self.stdin.as_ref().unwrap_or(default_stdin);
+ let stdout = self.stdout.as_ref().unwrap_or(&default);
+ let stderr = self.stderr.as_ref().unwrap_or(&default);
+ let (their_stdin, our_stdin) = stdin.to_child_stdio(true)?;
+ let (their_stdout, our_stdout) = stdout.to_child_stdio(false)?;
+ let (their_stderr, our_stderr) = stderr.to_child_stdio(false)?;
+ let ours = StdioPipes { stdin: our_stdin, stdout: our_stdout, stderr: our_stderr };
+ let theirs = ChildPipes { stdin: their_stdin, stdout: their_stdout, stderr: their_stderr };
+ Ok((ours, theirs))
+ }
+}
+
+fn os2c(s: &OsStr, saw_nul: &mut bool) -> CString {
+ CString::new(s.as_bytes()).unwrap_or_else(|_e| {
+ *saw_nul = true;
+ CString::new("<string-with-nul>").unwrap()
+ })
+}
+
+// Helper type to manage ownership of the strings within a C-style array.
+pub struct CStringArray {
+ items: Vec<CString>,
+ ptrs: Vec<*const c_char>,
+}
+
+impl CStringArray {
+ pub fn with_capacity(capacity: usize) -> Self {
+ let mut result = CStringArray {
+ items: Vec::with_capacity(capacity),
+ ptrs: Vec::with_capacity(capacity + 1),
+ };
+ result.ptrs.push(ptr::null());
+ result
+ }
+ pub fn push(&mut self, item: CString) {
+ let l = self.ptrs.len();
+ self.ptrs[l - 1] = item.as_ptr();
+ self.ptrs.push(ptr::null());
+ self.items.push(item);
+ }
+ pub fn as_ptr(&self) -> *const *const c_char {
+ self.ptrs.as_ptr()
+ }
+}
+
+fn construct_envp(env: BTreeMap<OsString, OsString>, saw_nul: &mut bool) -> CStringArray {
+ let mut result = CStringArray::with_capacity(env.len());
+ for (mut k, v) in env {
+ // Reserve additional space for '=' and null terminator
+ k.reserve_exact(v.len() + 2);
+ k.push("=");
+ k.push(&v);
+
+ // Add the new entry into the array
+ if let Ok(item) = CString::new(k.into_vec()) {
+ result.push(item);
+ } else {
+ *saw_nul = true;
+ }
+ }
+
+ result
+}
+
+impl Stdio {
+ pub fn to_child_stdio(&self, readable: bool) -> io::Result<(ChildStdio, Option<AnonPipe>)> {
+ match *self {
+ Stdio::Inherit => Ok((ChildStdio::Inherit, None)),
+
+ // Make sure that the source descriptors are not an stdio
+ // descriptor, otherwise the order which we set the child's
+ // descriptors may blow away a descriptor which we are hoping to
+ // save. For example, suppose we want the child's stderr to be the
+ // parent's stdout, and the child's stdout to be the parent's
+ // stderr. No matter which we dup first, the second will get
+ // overwritten prematurely.
+ Stdio::Fd(ref fd) => {
+ if fd.as_raw_fd() >= 0 && fd.as_raw_fd() <= libc::STDERR_FILENO {
+ Ok((ChildStdio::Owned(fd.duplicate()?), None))
+ } else {
+ Ok((ChildStdio::Explicit(fd.as_raw_fd()), None))
+ }
+ }
+
+ Stdio::MakePipe => {
+ let (reader, writer) = pipe::anon_pipe()?;
+ let (ours, theirs) = if readable { (writer, reader) } else { (reader, writer) };
+ Ok((ChildStdio::Owned(theirs.into_inner()), Some(ours)))
+ }
+
+ #[cfg(not(target_os = "fuchsia"))]
+ Stdio::Null => {
+ let mut opts = OpenOptions::new();
+ opts.read(readable);
+ opts.write(!readable);
+ let path = unsafe { CStr::from_ptr(DEV_NULL.as_ptr() as *const _) };
+ let fd = File::open_c(&path, &opts)?;
+ Ok((ChildStdio::Owned(fd.into_inner()), None))
+ }
+
+ #[cfg(target_os = "fuchsia")]
+ Stdio::Null => Ok((ChildStdio::Null, None)),
+ }
+ }
+}
+
+impl From<AnonPipe> for Stdio {
+ fn from(pipe: AnonPipe) -> Stdio {
+ Stdio::Fd(pipe.into_inner())
+ }
+}
+
+impl From<File> for Stdio {
+ fn from(file: File) -> Stdio {
+ Stdio::Fd(file.into_inner())
+ }
+}
+
+impl ChildStdio {
+ pub fn fd(&self) -> Option<c_int> {
+ match *self {
+ ChildStdio::Inherit => None,
+ ChildStdio::Explicit(fd) => Some(fd),
+ ChildStdio::Owned(ref fd) => Some(fd.as_raw_fd()),
+
+ #[cfg(target_os = "fuchsia")]
+ ChildStdio::Null => None,
+ }
+ }
+}
+
+impl fmt::Debug for Command {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ if self.program != self.args[0] {
+ write!(f, "[{:?}] ", self.program)?;
+ }
+ write!(f, "{:?}", self.args[0])?;
+
+ for arg in &self.args[1..] {
+ write!(f, " {:?}", arg)?;
+ }
+ Ok(())
+ }
+}
+
+#[derive(PartialEq, Eq, Clone, Copy)]
+pub struct ExitCode(u8);
+
+impl fmt::Debug for ExitCode {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ f.debug_tuple("unix_exit_status").field(&self.0).finish()
+ }
+}
+
+impl ExitCode {
+ pub const SUCCESS: ExitCode = ExitCode(EXIT_SUCCESS as _);
+ pub const FAILURE: ExitCode = ExitCode(EXIT_FAILURE as _);
+
+ #[inline]
+ pub fn as_i32(&self) -> i32 {
+ self.0 as i32
+ }
+}
+
+impl From<u8> for ExitCode {
+ fn from(code: u8) -> Self {
+ Self(code)
+ }
+}
+
+pub struct CommandArgs<'a> {
+ iter: crate::slice::Iter<'a, CString>,
+}
+
+impl<'a> Iterator for CommandArgs<'a> {
+ type Item = &'a OsStr;
+ fn next(&mut self) -> Option<&'a OsStr> {
+ self.iter.next().map(|cs| OsStr::from_bytes(cs.as_bytes()))
+ }
+ fn size_hint(&self) -> (usize, Option<usize>) {
+ self.iter.size_hint()
+ }
+}
+
+impl<'a> ExactSizeIterator for CommandArgs<'a> {
+ fn len(&self) -> usize {
+ self.iter.len()
+ }
+ fn is_empty(&self) -> bool {
+ self.iter.is_empty()
+ }
+}
+
+impl<'a> fmt::Debug for CommandArgs<'a> {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ f.debug_list().entries(self.iter.clone()).finish()
+ }
+}
diff --git a/library/std/src/sys/unix/process/process_common/tests.rs b/library/std/src/sys/unix/process/process_common/tests.rs
new file mode 100644
index 000000000..1956b3692
--- /dev/null
+++ b/library/std/src/sys/unix/process/process_common/tests.rs
@@ -0,0 +1,124 @@
+use super::*;
+
+use crate::ffi::OsStr;
+use crate::mem;
+use crate::ptr;
+use crate::sys::{cvt, cvt_nz};
+
+macro_rules! t {
+ ($e:expr) => {
+ match $e {
+ Ok(t) => t,
+ Err(e) => panic!("received error for `{}`: {}", stringify!($e), e),
+ }
+ };
+}
+
+#[test]
+#[cfg_attr(
+ any(
+ // See #14232 for more information, but it appears that signal delivery to a
+ // newly spawned process may just be raced in the macOS, so to prevent this
+ // test from being flaky we ignore it on macOS.
+ target_os = "macos",
+ // When run under our current QEMU emulation test suite this test fails,
+ // although the reason isn't very clear as to why. For now this test is
+ // ignored there.
+ target_arch = "arm",
+ target_arch = "aarch64",
+ target_arch = "riscv64",
+ ),
+ ignore
+)]
+fn test_process_mask() {
+ unsafe {
+ // Test to make sure that a signal mask does not get inherited.
+ let mut cmd = Command::new(OsStr::new("cat"));
+
+ let mut set = mem::MaybeUninit::<libc::sigset_t>::uninit();
+ let mut old_set = mem::MaybeUninit::<libc::sigset_t>::uninit();
+ t!(cvt(sigemptyset(set.as_mut_ptr())));
+ t!(cvt(sigaddset(set.as_mut_ptr(), libc::SIGINT)));
+ t!(cvt_nz(libc::pthread_sigmask(libc::SIG_SETMASK, set.as_ptr(), old_set.as_mut_ptr())));
+
+ cmd.stdin(Stdio::MakePipe);
+ cmd.stdout(Stdio::MakePipe);
+
+ let (mut cat, mut pipes) = t!(cmd.spawn(Stdio::Null, true));
+ let stdin_write = pipes.stdin.take().unwrap();
+ let stdout_read = pipes.stdout.take().unwrap();
+
+ t!(cvt_nz(libc::pthread_sigmask(libc::SIG_SETMASK, old_set.as_ptr(), ptr::null_mut())));
+
+ t!(cvt(libc::kill(cat.id() as libc::pid_t, libc::SIGINT)));
+ // We need to wait until SIGINT is definitely delivered. The
+ // easiest way is to write something to cat, and try to read it
+ // back: if SIGINT is unmasked, it'll get delivered when cat is
+ // next scheduled.
+ let _ = stdin_write.write(b"Hello");
+ drop(stdin_write);
+
+ // Either EOF or failure (EPIPE) is okay.
+ let mut buf = [0; 5];
+ if let Ok(ret) = stdout_read.read(&mut buf) {
+ assert_eq!(ret, 0);
+ }
+
+ t!(cat.wait());
+ }
+}
+
+#[test]
+#[cfg_attr(
+ any(
+ // See test_process_mask
+ target_os = "macos",
+ target_arch = "arm",
+ target_arch = "aarch64",
+ target_arch = "riscv64",
+ ),
+ ignore
+)]
+fn test_process_group_posix_spawn() {
+ unsafe {
+ // Spawn a cat subprocess that's just going to hang since there is no I/O.
+ let mut cmd = Command::new(OsStr::new("cat"));
+ cmd.pgroup(0);
+ cmd.stdin(Stdio::MakePipe);
+ cmd.stdout(Stdio::MakePipe);
+ let (mut cat, _pipes) = t!(cmd.spawn(Stdio::Null, true));
+
+ // Check that we can kill its process group, which means there *is* one.
+ t!(cvt(libc::kill(-(cat.id() as libc::pid_t), libc::SIGINT)));
+
+ t!(cat.wait());
+ }
+}
+
+#[test]
+#[cfg_attr(
+ any(
+ // See test_process_mask
+ target_os = "macos",
+ target_arch = "arm",
+ target_arch = "aarch64",
+ target_arch = "riscv64",
+ ),
+ ignore
+)]
+fn test_process_group_no_posix_spawn() {
+ unsafe {
+ // Same as above, create hang-y cat. This time, force using the non-posix_spawnp path.
+ let mut cmd = Command::new(OsStr::new("cat"));
+ cmd.pgroup(0);
+ cmd.pre_exec(Box::new(|| Ok(()))); // pre_exec forces fork + exec
+ cmd.stdin(Stdio::MakePipe);
+ cmd.stdout(Stdio::MakePipe);
+ let (mut cat, _pipes) = t!(cmd.spawn(Stdio::Null, true));
+
+ // Check that we can kill its process group, which means there *is* one.
+ t!(cvt(libc::kill(-(cat.id() as libc::pid_t), libc::SIGINT)));
+
+ t!(cat.wait());
+ }
+}
diff --git a/library/std/src/sys/unix/process/process_fuchsia.rs b/library/std/src/sys/unix/process/process_fuchsia.rs
new file mode 100644
index 000000000..73f5d3a61
--- /dev/null
+++ b/library/std/src/sys/unix/process/process_fuchsia.rs
@@ -0,0 +1,327 @@
+use crate::fmt;
+use crate::io;
+use crate::mem;
+use crate::num::{NonZeroI32, NonZeroI64};
+use crate::ptr;
+
+use crate::sys::process::process_common::*;
+use crate::sys::process::zircon::{zx_handle_t, Handle};
+
+use libc::{c_int, size_t};
+
+////////////////////////////////////////////////////////////////////////////////
+// Command
+////////////////////////////////////////////////////////////////////////////////
+
+impl Command {
+ pub fn spawn(
+ &mut self,
+ default: Stdio,
+ needs_stdin: bool,
+ ) -> io::Result<(Process, StdioPipes)> {
+ let envp = self.capture_env();
+
+ if self.saw_nul() {
+ return Err(io::const_io_error!(
+ io::ErrorKind::InvalidInput,
+ "nul byte found in provided data",
+ ));
+ }
+
+ let (ours, theirs) = self.setup_io(default, needs_stdin)?;
+
+ let process_handle = unsafe { self.do_exec(theirs, envp.as_ref())? };
+
+ Ok((Process { handle: Handle::new(process_handle) }, ours))
+ }
+
+ pub fn exec(&mut self, default: Stdio) -> io::Error {
+ if self.saw_nul() {
+ return io::const_io_error!(
+ io::ErrorKind::InvalidInput,
+ "nul byte found in provided data",
+ );
+ }
+
+ match self.setup_io(default, true) {
+ Ok((_, _)) => {
+ // FIXME: This is tough because we don't support the exec syscalls
+ unimplemented!();
+ }
+ Err(e) => e,
+ }
+ }
+
+ unsafe fn do_exec(
+ &mut self,
+ stdio: ChildPipes,
+ maybe_envp: Option<&CStringArray>,
+ ) -> io::Result<zx_handle_t> {
+ use crate::sys::process::zircon::*;
+
+ let envp = match maybe_envp {
+ // None means to clone the current environment, which is done in the
+ // flags below.
+ None => ptr::null(),
+ Some(envp) => envp.as_ptr(),
+ };
+
+ let make_action = |local_io: &ChildStdio, target_fd| -> io::Result<fdio_spawn_action_t> {
+ if let Some(local_fd) = local_io.fd() {
+ Ok(fdio_spawn_action_t {
+ action: FDIO_SPAWN_ACTION_TRANSFER_FD,
+ local_fd,
+ target_fd,
+ ..Default::default()
+ })
+ } else {
+ if let ChildStdio::Null = local_io {
+ // acts as no-op
+ return Ok(Default::default());
+ }
+
+ let mut handle = ZX_HANDLE_INVALID;
+ let status = fdio_fd_clone(target_fd, &mut handle);
+ if status == ERR_INVALID_ARGS || status == ERR_NOT_SUPPORTED {
+ // This descriptor is closed; skip it rather than generating an
+ // error.
+ return Ok(Default::default());
+ }
+ zx_cvt(status)?;
+
+ let mut cloned_fd = 0;
+ zx_cvt(fdio_fd_create(handle, &mut cloned_fd))?;
+
+ Ok(fdio_spawn_action_t {
+ action: FDIO_SPAWN_ACTION_TRANSFER_FD,
+ local_fd: cloned_fd as i32,
+ target_fd,
+ ..Default::default()
+ })
+ }
+ };
+
+ // Clone stdin, stdout, and stderr
+ let action1 = make_action(&stdio.stdin, 0)?;
+ let action2 = make_action(&stdio.stdout, 1)?;
+ let action3 = make_action(&stdio.stderr, 2)?;
+ let actions = [action1, action2, action3];
+
+ // We don't want FileDesc::drop to be called on any stdio. fdio_spawn_etc
+ // always consumes transferred file descriptors.
+ mem::forget(stdio);
+
+ for callback in self.get_closures().iter_mut() {
+ callback()?;
+ }
+
+ let mut process_handle: zx_handle_t = 0;
+ zx_cvt(fdio_spawn_etc(
+ ZX_HANDLE_INVALID,
+ FDIO_SPAWN_CLONE_JOB
+ | FDIO_SPAWN_CLONE_LDSVC
+ | FDIO_SPAWN_CLONE_NAMESPACE
+ | FDIO_SPAWN_CLONE_ENVIRON // this is ignored when envp is non-null
+ | FDIO_SPAWN_CLONE_UTC_CLOCK,
+ self.get_program_cstr().as_ptr(),
+ self.get_argv().as_ptr(),
+ envp,
+ actions.len() as size_t,
+ actions.as_ptr(),
+ &mut process_handle,
+ ptr::null_mut(),
+ ))?;
+ // FIXME: See if we want to do something with that err_msg
+
+ Ok(process_handle)
+ }
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// Processes
+////////////////////////////////////////////////////////////////////////////////
+
+pub struct Process {
+ handle: Handle,
+}
+
+impl Process {
+ pub fn id(&self) -> u32 {
+ self.handle.raw() as u32
+ }
+
+ pub fn kill(&mut self) -> io::Result<()> {
+ use crate::sys::process::zircon::*;
+
+ unsafe {
+ zx_cvt(zx_task_kill(self.handle.raw()))?;
+ }
+
+ Ok(())
+ }
+
+ pub fn wait(&mut self) -> io::Result<ExitStatus> {
+ use crate::default::Default;
+ use crate::sys::process::zircon::*;
+
+ let mut proc_info: zx_info_process_t = Default::default();
+ let mut actual: size_t = 0;
+ let mut avail: size_t = 0;
+
+ unsafe {
+ zx_cvt(zx_object_wait_one(
+ self.handle.raw(),
+ ZX_TASK_TERMINATED,
+ ZX_TIME_INFINITE,
+ ptr::null_mut(),
+ ))?;
+ zx_cvt(zx_object_get_info(
+ self.handle.raw(),
+ ZX_INFO_PROCESS,
+ &mut proc_info as *mut _ as *mut libc::c_void,
+ mem::size_of::<zx_info_process_t>(),
+ &mut actual,
+ &mut avail,
+ ))?;
+ }
+ if actual != 1 {
+ return Err(io::const_io_error!(
+ io::ErrorKind::InvalidData,
+ "Failed to get exit status of process",
+ ));
+ }
+ Ok(ExitStatus(proc_info.return_code))
+ }
+
+ pub fn try_wait(&mut self) -> io::Result<Option<ExitStatus>> {
+ use crate::default::Default;
+ use crate::sys::process::zircon::*;
+
+ let mut proc_info: zx_info_process_t = Default::default();
+ let mut actual: size_t = 0;
+ let mut avail: size_t = 0;
+
+ unsafe {
+ let status =
+ zx_object_wait_one(self.handle.raw(), ZX_TASK_TERMINATED, 0, ptr::null_mut());
+ match status {
+ 0 => {} // Success
+ x if x == ERR_TIMED_OUT => {
+ return Ok(None);
+ }
+ _ => {
+ panic!("Failed to wait on process handle: {status}");
+ }
+ }
+ zx_cvt(zx_object_get_info(
+ self.handle.raw(),
+ ZX_INFO_PROCESS,
+ &mut proc_info as *mut _ as *mut libc::c_void,
+ mem::size_of::<zx_info_process_t>(),
+ &mut actual,
+ &mut avail,
+ ))?;
+ }
+ if actual != 1 {
+ return Err(io::const_io_error!(
+ io::ErrorKind::InvalidData,
+ "Failed to get exit status of process",
+ ));
+ }
+ Ok(Some(ExitStatus(proc_info.return_code)))
+ }
+}
+
+#[derive(PartialEq, Eq, Clone, Copy, Debug)]
+pub struct ExitStatus(i64);
+
+impl ExitStatus {
+ pub fn exit_ok(&self) -> Result<(), ExitStatusError> {
+ match NonZeroI64::try_from(self.0) {
+ /* was nonzero */ Ok(failure) => Err(ExitStatusError(failure)),
+ /* was zero, couldn't convert */ Err(_) => Ok(()),
+ }
+ }
+
+ pub fn code(&self) -> Option<i32> {
+ // FIXME: support extracting return code as an i64
+ self.0.try_into().ok()
+ }
+
+ pub fn signal(&self) -> Option<i32> {
+ None
+ }
+
+ // FIXME: The actually-Unix implementation in process_unix.rs uses WSTOPSIG, WCOREDUMP et al.
+ // I infer from the implementation of `success`, `code` and `signal` above that these are not
+ // available on Fuchsia.
+ //
+ // It does not appear that Fuchsia is Unix-like enough to implement ExitStatus (or indeed many
+ // other things from std::os::unix) properly. This veneer is always going to be a bodge. So
+ // while I don't know if these implementations are actually correct, I think they will do for
+ // now at least.
+ pub fn core_dumped(&self) -> bool {
+ false
+ }
+ pub fn stopped_signal(&self) -> Option<i32> {
+ None
+ }
+ pub fn continued(&self) -> bool {
+ false
+ }
+
+ pub fn into_raw(&self) -> c_int {
+ // We don't know what someone who calls into_raw() will do with this value, but it should
+ // have the conventional Unix representation. Despite the fact that this is not
+ // standardised in SuS or POSIX, all Unix systems encode the signal and exit status the
+ // same way. (Ie the WIFEXITED, WEXITSTATUS etc. macros have identical behaviour on every
+ // Unix.)
+ //
+ // The caller of `std::os::unix::into_raw` is probably wanting a Unix exit status, and may
+ // do their own shifting and masking, or even pass the status to another computer running a
+ // different Unix variant.
+ //
+ // The other view would be to say that the caller on Fuchsia ought to know that `into_raw`
+ // will give a raw Fuchsia status (whatever that is - I don't know, personally). That is
+ // not possible here because we must return a c_int because that's what Unix (including
+ // SuS and POSIX) say a wait status is, but Fuchsia apparently uses a u64, so it won't
+ // necessarily fit.
+ //
+ // It seems to me that that the right answer would be to provide std::os::fuchsia with its
+ // own ExitStatusExt, rather that trying to provide a not very convincing imitation of
+ // Unix. Ie, std::os::unix::process:ExitStatusExt ought not to exist on Fuchsia. But
+ // fixing this up that is beyond the scope of my efforts now.
+ let exit_status_as_if_unix: u8 = self.0.try_into().expect("Fuchsia process return code bigger than 8 bits, but std::os::unix::ExitStatusExt::into_raw() was called to try to convert the value into a traditional Unix-style wait status, which cannot represent values greater than 255.");
+ let wait_status_as_if_unix = (exit_status_as_if_unix as c_int) << 8;
+ wait_status_as_if_unix
+ }
+}
+
+/// Converts a raw `c_int` to a type-safe `ExitStatus` by wrapping it without copying.
+impl From<c_int> for ExitStatus {
+ fn from(a: c_int) -> ExitStatus {
+ ExitStatus(a as i64)
+ }
+}
+
+impl fmt::Display for ExitStatus {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ write!(f, "exit code: {}", self.0)
+ }
+}
+
+#[derive(PartialEq, Eq, Clone, Copy, Debug)]
+pub struct ExitStatusError(NonZeroI64);
+
+impl Into<ExitStatus> for ExitStatusError {
+ fn into(self) -> ExitStatus {
+ ExitStatus(self.0.into())
+ }
+}
+
+impl ExitStatusError {
+ pub fn code(self) -> Option<NonZeroI32> {
+ // fixme: affected by the same bug as ExitStatus::code()
+ ExitStatus(self.0.into()).code().map(|st| st.try_into().unwrap())
+ }
+}
diff --git a/library/std/src/sys/unix/process/process_unix.rs b/library/std/src/sys/unix/process/process_unix.rs
new file mode 100644
index 000000000..75bb92437
--- /dev/null
+++ b/library/std/src/sys/unix/process/process_unix.rs
@@ -0,0 +1,836 @@
+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};
+
+////////////////////////////////////////////////////////////////////////////////
+// Command
+////////////////////////////////////////////////////////////////////////////////
+
+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()?;
+
+ // Whatever happens after the fork is almost for sure going to touch or
+ // look at the environment in one way or another (PATH in `execvp` or
+ // accessing the `environ` pointer ourselves). Make sure no other thread
+ // is accessing the environment when we do the fork itself.
+ //
+ // Note that as soon as we're done with the fork there's no need to hold
+ // a lock any more because the parent won't do anything and the child is
+ // in its own process. Thus the parent drops the lock guard while the child
+ // forgets it to avoid unlocking it on a new thread, which would be invalid.
+ 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],
+ ];
+ // pipe I/O up to PIPE_BUF bytes should be atomic, and then
+ // we want to be sure we *don't* run at_exit destructors as
+ // we're being torn down regardless
+ rtassert!(output.write(&bytes).is_ok());
+ unsafe { libc::_exit(1) }
+ }
+
+ drop(env_lock);
+ drop(output);
+
+ // Safety: We obtained the pidfd from calling `clone3` with
+ // `CLONE_PIDFD` so it's valid an otherwise unowned.
+ let mut p = unsafe { Process::new(pid, pidfd) };
+ let mut bytes = [0; 8];
+
+ // loop to handle EINTR
+ 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(..) => {
+ // pipe I/O up to PIPE_BUF bytes should be atomic
+ assert!(p.wait().is_ok(), "wait() should either return Ok or panic");
+ panic!("short read on the CLOEXEC pipe")
+ }
+ }
+ }
+ }
+
+ // Attempts to fork the process. If successful, returns Ok((0, -1))
+ // in the child, and Ok((child_pid, -1)) in the parent.
+ #[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))
+ }
+
+ // Attempts to fork the process. If successful, returns Ok((0, -1))
+ // in the child, and Ok((child_pid, child_pidfd)) in the parent.
+ #[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
+ }
+
+ // Bypassing libc for `clone3` can make further libc calls unsafe,
+ // so we use it sparingly for now. See #89522 for details.
+ // Some tools (e.g. sandboxing tools) may also expect `fork`
+ // rather than `clone3`.
+ let want_clone3_pidfd = self.get_create_pidfd();
+
+ // If we fail to create a pidfd for any reason, this will
+ // stay as -1, which indicates an error.
+ let mut pidfd: pid_t = -1;
+
+ // Attempt to use the `clone3` syscall, which supports more arguments
+ // (in particular, the ability to create a pidfd). If this fails,
+ // we will fall through this block to a call to `fork()`
+ 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() {
+ // Multiple threads can race to execute this store,
+ // but that's fine - that just means that multiple threads
+ // will have tried and failed to execute the same syscall,
+ // with no other side effects.
+ Some(libc::ENOSYS) => HAS_CLONE3.store(false, Ordering::Relaxed),
+ // Fallback to fork if `EPERM` is returned. (e.g. blocked by seccomp)
+ Some(libc::EPERM) => {}
+ _ => return Err(e),
+ },
+ }
+ }
+
+ // Generally, we just call `fork`. If we get here after wanting `clone3`,
+ // then the syscall does not exist or we do not have permission to call it.
+ 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 {
+ // Similar to when forking, we want to ensure that access to
+ // the environment is synchronized, so make sure to grab the
+ // environment lock before we try to exec.
+ let _lock = sys::os::env_read_lock();
+
+ let Err(e) = self.do_exec(theirs, envp.as_ref());
+ e
+ }
+ }
+ Err(e) => e,
+ }
+ }
+
+ // And at this point we've reached a special time in the life of the
+ // child. The child must now be considered hamstrung and unable to
+ // do anything other than syscalls really. Consider the following
+ // scenario:
+ //
+ // 1. Thread A of process 1 grabs the malloc() mutex
+ // 2. Thread B of process 1 forks(), creating thread C
+ // 3. Thread C of process 2 then attempts to malloc()
+ // 4. The memory of process 2 is the same as the memory of
+ // process 1, so the mutex is locked.
+ //
+ // This situation looks a lot like deadlock, right? It turns out
+ // that this is what pthread_atfork() takes care of, which is
+ // presumably implemented across platforms. The first thing that
+ // threads to *before* forking is to do things like grab the malloc
+ // mutex, and then after the fork they unlock it.
+ //
+ // Despite this information, libnative's spawn has been witnessed to
+ // deadlock on both macOS and FreeBSD. I'm not entirely sure why, but
+ // all collected backtraces point at malloc/free traffic in the
+ // child spawned process.
+ //
+ // For this reason, the block of code below should contain 0
+ // invocations of either malloc of free (or their related friends).
+ //
+ // As an example of not having malloc/free traffic, we don't close
+ // this file descriptor by dropping the FileDesc (which contains an
+ // allocation). Instead we just close it manually. This will never
+ // have the drop glue anyway because this code never returns (the
+ // child will either exec() or invoke libc::exit)
+ 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() {
+ //FIXME: Redox kernel does not support setgroups yet
+ #[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() {
+ // When dropping privileges from root, the `setgroups` call
+ // will remove any extraneous groups. We only drop groups
+ // if the current uid is 0 and we weren't given an explicit
+ // set of groups. If we don't call this, then even though our
+ // uid has dropped, we may still have groups that enable us to
+ // do super-user things.
+ //FIXME: Redox kernel does not support setgroups yet
+ #[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))?;
+ }
+
+ // emscripten has no signal support.
+ #[cfg(not(target_os = "emscripten"))]
+ {
+ use crate::mem::MaybeUninit;
+ use crate::sys::cvt_nz;
+ // Reset signal handling so the child process starts in a
+ // standardized state. libstd ignores SIGPIPE, and signal-handling
+ // libraries often set a mask. Child processes inherit ignored
+ // signals and the signal mask from their parent, but most
+ // UNIX programs do not reset these things on their own, so we
+ // need to clean things up now to avoid confusing the program
+ // we're about to run.
+ 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")] // see issue #88585
+ {
+ 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()?;
+ }
+
+ // Although we're performing an exec here we may also return with an
+ // error from this function (without actually exec'ing) in which case we
+ // want to be sure to restore the global environment back to what it
+ // once was, ensuring that our temporary override, when free'd, doesn't
+ // corrupt our process's environment.
+ 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)
+ }
+
+ // Only support platforms for which posix_spawn() can return ENOENT
+ // directly.
+ #[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);
+ }
+
+ // Only glibc 2.24+ posix_spawn() supports returning ENOENT directly.
+ #[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);
+ }
+ }
+
+ // Solaris, glibc 2.29+, and musl 1.24+ can set a new working directory,
+ // and maybe others will gain this non-POSIX function too. We'll check
+ // for this weak symbol as soon as it's needed, so we can return early
+ // otherwise to do a manual chdir before exec.
+ 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") {
+ // There is a bug in macOS where a relative executable
+ // path like "../myprogram" will cause `posix_spawn` to
+ // successfully launch the program, but erroneously return
+ // ENOENT when used with posix_spawn_file_actions_addchdir_np
+ // which was introduced in macOS 10.15.
+ 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();
+
+ // Safety: -1 indicates we don't have a pidfd.
+ 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 _))?;
+
+ // Make sure we synchronize access to the global `environ` resource
+ 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))
+ }
+ }
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// Processes
+////////////////////////////////////////////////////////////////////////////////
+
+/// The unique ID of the process (this should never be negative).
+pub struct Process {
+ pid: pid_t,
+ status: Option<ExitStatus>,
+ // On Linux, stores the pidfd created for this child.
+ // This is None if the user did not request pidfd creation,
+ // or if the pidfd could not be created for some reason
+ // (e.g. the `clone3` syscall was not available).
+ #[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;
+ // Safety: If `pidfd` is nonnegative, we assume it's valid and otherwise unowned.
+ 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 we've already waited on this process then the pid can be recycled
+ // and used for another process, and we probably shouldn't be killing
+ // random processes, so just return an error.
+ 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)))
+ }
+ }
+}
+
+/// Unix exit statuses
+//
+// This is not actually an "exit status" in Unix terminology. Rather, it is a "wait status".
+// See the discussion in comments and doc comments for `std::process::ExitStatus`.
+#[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> {
+ // This assumes that WIFEXITED(status) && WEXITSTATUS==0 corresponds to status==0. This is
+ // true on all actual versions of Unix, is widely assumed, and is specified in SuS
+ // https://pubs.opengroup.org/onlinepubs/9699919799/functions/wait.html . If it is not
+ // true for a platform pretending to be Unix, the tests (our doctests, and also
+ // procsss_unix/tests.rs) will spot it. `ExitStatusError::code` assumes this too.
+ match NonZero_c_int::try_from(self.0) {
+ /* was nonzero */ Ok(failure) => Err(ExitStatusError(failure)),
+ /* was zero, couldn't convert */ 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
+ }
+}
+
+/// Converts a raw `c_int` to a type-safe `ExitStatus` by wrapping it without copying.
+impl From<c_int> for ExitStatus {
+ fn from(a: c_int) -> ExitStatus {
+ ExitStatus(a)
+ }
+}
+
+/// Convert a signal number to a readable, searchable name.
+///
+/// This string should be displayed right after the signal number.
+/// If a signal is unrecognized, it returns the empty string, so that
+/// you just get the number like "0". If it is recognized, you'll get
+/// something like "9 (SIGKILL)".
+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)",
+ // For information on Linux signals, run `man 7 signal`
+ #[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;
diff --git a/library/std/src/sys/unix/process/process_unix/tests.rs b/library/std/src/sys/unix/process/process_unix/tests.rs
new file mode 100644
index 000000000..e0e2d478f
--- /dev/null
+++ b/library/std/src/sys/unix/process/process_unix/tests.rs
@@ -0,0 +1,62 @@
+use crate::os::unix::process::{CommandExt, ExitStatusExt};
+use crate::panic::catch_unwind;
+use crate::process::Command;
+
+// Many of the other aspects of this situation, including heap alloc concurrency
+// safety etc., are tested in src/test/ui/process/process-panic-after-fork.rs
+
+#[test]
+fn exitstatus_display_tests() {
+ // In practice this is the same on every Unix.
+ // If some weird platform turns out to be different, and this test fails, use #[cfg].
+ use crate::os::unix::process::ExitStatusExt;
+ use crate::process::ExitStatus;
+
+ let t = |v, s| assert_eq!(s, format!("{}", <ExitStatus as ExitStatusExt>::from_raw(v)));
+
+ t(0x0000f, "signal: 15 (SIGTERM)");
+ t(0x0008b, "signal: 11 (SIGSEGV) (core dumped)");
+ t(0x00000, "exit status: 0");
+ t(0x0ff00, "exit status: 255");
+
+ // On MacOS, 0x0137f is WIFCONTINUED, not WIFSTOPPED. Probably *BSD is similar.
+ // https://github.com/rust-lang/rust/pull/82749#issuecomment-790525956
+ // The purpose of this test is to test our string formatting, not our understanding of the wait
+ // status magic numbers. So restrict these to Linux.
+ if cfg!(target_os = "linux") {
+ t(0x0137f, "stopped (not terminated) by signal: 19 (SIGSTOP)");
+ t(0x0ffff, "continued (WIFCONTINUED)");
+ }
+
+ // Testing "unrecognised wait status" is hard because the wait.h macros typically
+ // assume that the value came from wait and isn't mad. With the glibc I have here
+ // this works:
+ if cfg!(all(target_os = "linux", target_env = "gnu")) {
+ t(0x000ff, "unrecognised wait status: 255 0xff");
+ }
+}
+
+#[test]
+#[cfg_attr(target_os = "emscripten", ignore)]
+fn test_command_fork_no_unwind() {
+ let got = catch_unwind(|| {
+ let mut c = Command::new("echo");
+ c.arg("hi");
+ unsafe {
+ c.pre_exec(|| panic!("{}", "crash now!"));
+ }
+ let st = c.status().expect("failed to get command status");
+ dbg!(st);
+ st
+ });
+ dbg!(&got);
+ let status = got.expect("panic unexpectedly propagated");
+ dbg!(status);
+ let signal = status.signal().expect("expected child process to die of signal");
+ assert!(
+ signal == libc::SIGABRT
+ || signal == libc::SIGILL
+ || signal == libc::SIGTRAP
+ || signal == libc::SIGSEGV
+ );
+}
diff --git a/library/std/src/sys/unix/process/process_unsupported.rs b/library/std/src/sys/unix/process/process_unsupported.rs
new file mode 100644
index 000000000..72f9f3f9c
--- /dev/null
+++ b/library/std/src/sys/unix/process/process_unsupported.rs
@@ -0,0 +1,118 @@
+use crate::fmt;
+use crate::io;
+use crate::num::NonZeroI32;
+use crate::sys::process::process_common::*;
+use crate::sys::unix::unsupported::*;
+use core::ffi::NonZero_c_int;
+
+use libc::{c_int, pid_t};
+
+////////////////////////////////////////////////////////////////////////////////
+// Command
+////////////////////////////////////////////////////////////////////////////////
+
+impl Command {
+ pub fn spawn(
+ &mut self,
+ _default: Stdio,
+ _needs_stdin: bool,
+ ) -> io::Result<(Process, StdioPipes)> {
+ unsupported()
+ }
+
+ pub fn exec(&mut self, _default: Stdio) -> io::Error {
+ unsupported_err()
+ }
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// Processes
+////////////////////////////////////////////////////////////////////////////////
+
+pub struct Process {
+ _handle: pid_t,
+}
+
+impl Process {
+ pub fn id(&self) -> u32 {
+ 0
+ }
+
+ pub fn kill(&mut self) -> io::Result<()> {
+ unsupported()
+ }
+
+ pub fn wait(&mut self) -> io::Result<ExitStatus> {
+ unsupported()
+ }
+
+ pub fn try_wait(&mut self) -> io::Result<Option<ExitStatus>> {
+ unsupported()
+ }
+}
+
+#[derive(PartialEq, Eq, Clone, Copy, Debug)]
+pub struct ExitStatus(c_int);
+
+impl ExitStatus {
+ #[cfg_attr(target_os = "horizon", allow(unused))]
+ pub fn success(&self) -> bool {
+ self.code() == Some(0)
+ }
+
+ pub fn exit_ok(&self) -> Result<(), ExitStatusError> {
+ Err(ExitStatusError(1.try_into().unwrap()))
+ }
+
+ pub fn code(&self) -> Option<i32> {
+ None
+ }
+
+ pub fn signal(&self) -> Option<i32> {
+ None
+ }
+
+ pub fn core_dumped(&self) -> bool {
+ false
+ }
+
+ pub fn stopped_signal(&self) -> Option<i32> {
+ None
+ }
+
+ pub fn continued(&self) -> bool {
+ false
+ }
+
+ pub fn into_raw(&self) -> c_int {
+ 0
+ }
+}
+
+/// Converts a raw `c_int` to a type-safe `ExitStatus` by wrapping it without copying.
+impl From<c_int> for ExitStatus {
+ fn from(a: c_int) -> ExitStatus {
+ ExitStatus(a as i32)
+ }
+}
+
+impl fmt::Display for ExitStatus {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ write!(f, "exit code: {}", self.0)
+ }
+}
+
+#[derive(PartialEq, Eq, Clone, Copy, Debug)]
+pub struct ExitStatusError(NonZero_c_int);
+
+impl Into<ExitStatus> for ExitStatusError {
+ fn into(self) -> ExitStatus {
+ ExitStatus(self.0.into())
+ }
+}
+
+impl ExitStatusError {
+ pub fn code(self) -> Option<NonZeroI32> {
+ ExitStatus(self.0.into()).code().map(|st| st.try_into().unwrap())
+ }
+}
diff --git a/library/std/src/sys/unix/process/process_vxworks.rs b/library/std/src/sys/unix/process/process_vxworks.rs
new file mode 100644
index 000000000..200ef6719
--- /dev/null
+++ b/library/std/src/sys/unix/process/process_vxworks.rs
@@ -0,0 +1,262 @@
+use crate::fmt;
+use crate::io::{self, Error, ErrorKind};
+use crate::num::NonZeroI32;
+use crate::sys;
+use crate::sys::cvt;
+use crate::sys::process::process_common::*;
+use crate::sys_common::thread;
+use core::ffi::NonZero_c_int;
+use libc::RTP_ID;
+use libc::{self, c_char, c_int};
+
+////////////////////////////////////////////////////////////////////////////////
+// Command
+////////////////////////////////////////////////////////////////////////////////
+
+impl Command {
+ pub fn spawn(
+ &mut self,
+ default: Stdio,
+ needs_stdin: bool,
+ ) -> io::Result<(Process, StdioPipes)> {
+ use crate::sys::cvt_r;
+ 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)?;
+ let mut p = Process { pid: 0, status: None };
+
+ unsafe {
+ macro_rules! t {
+ ($e:expr) => {
+ match $e {
+ Ok(e) => e,
+ Err(e) => return Err(e.into()),
+ }
+ };
+ }
+
+ let mut orig_stdin = libc::STDIN_FILENO;
+ let mut orig_stdout = libc::STDOUT_FILENO;
+ let mut orig_stderr = libc::STDERR_FILENO;
+
+ if let Some(fd) = theirs.stdin.fd() {
+ orig_stdin = t!(cvt_r(|| libc::dup(libc::STDIN_FILENO)));
+ t!(cvt_r(|| libc::dup2(fd, libc::STDIN_FILENO)));
+ }
+ if let Some(fd) = theirs.stdout.fd() {
+ orig_stdout = t!(cvt_r(|| libc::dup(libc::STDOUT_FILENO)));
+ t!(cvt_r(|| libc::dup2(fd, libc::STDOUT_FILENO)));
+ }
+ if let Some(fd) = theirs.stderr.fd() {
+ orig_stderr = t!(cvt_r(|| libc::dup(libc::STDERR_FILENO)));
+ t!(cvt_r(|| libc::dup2(fd, libc::STDERR_FILENO)));
+ }
+
+ if let Some(ref cwd) = *self.get_cwd() {
+ t!(cvt(libc::chdir(cwd.as_ptr())));
+ }
+
+ // pre_exec closures are ignored on VxWorks
+ let _ = self.get_closures();
+
+ let c_envp = envp
+ .as_ref()
+ .map(|c| c.as_ptr())
+ .unwrap_or_else(|| *sys::os::environ() as *const _);
+ let stack_size = thread::min_stack();
+
+ // ensure that access to the environment is synchronized
+ let _lock = sys::os::env_read_lock();
+
+ let ret = libc::rtpSpawn(
+ self.get_program_cstr().as_ptr(),
+ self.get_argv().as_ptr() as *mut *const c_char, // argv
+ c_envp as *mut *const c_char,
+ 100 as c_int, // initial priority
+ stack_size, // initial stack size.
+ 0, // options
+ 0, // task options
+ );
+
+ // Because FileDesc was not used, each duplicated file descriptor
+ // needs to be closed manually
+ if orig_stdin != libc::STDIN_FILENO {
+ t!(cvt_r(|| libc::dup2(orig_stdin, libc::STDIN_FILENO)));
+ libc::close(orig_stdin);
+ }
+ if orig_stdout != libc::STDOUT_FILENO {
+ t!(cvt_r(|| libc::dup2(orig_stdout, libc::STDOUT_FILENO)));
+ libc::close(orig_stdout);
+ }
+ if orig_stderr != libc::STDERR_FILENO {
+ t!(cvt_r(|| libc::dup2(orig_stderr, libc::STDERR_FILENO)));
+ libc::close(orig_stderr);
+ }
+
+ if ret != libc::RTP_ID_ERROR {
+ p.pid = ret;
+ Ok((p, ours))
+ } else {
+ Err(io::Error::last_os_error())
+ }
+ }
+ }
+
+ pub fn exec(&mut self, default: Stdio) -> io::Error {
+ let ret = Command::spawn(self, default, false);
+ match ret {
+ Ok(t) => unsafe {
+ let mut status = 0 as c_int;
+ libc::waitpid(t.0.pid, &mut status, 0);
+ libc::exit(0);
+ },
+ Err(e) => e,
+ }
+ }
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// Processes
+////////////////////////////////////////////////////////////////////////////////
+
+/// The unique id of the process (this should never be negative).
+pub struct Process {
+ pid: RTP_ID,
+ status: Option<ExitStatus>,
+}
+
+impl Process {
+ pub fn id(&self) -> u32 {
+ self.pid as u32
+ }
+
+ pub fn kill(&mut self) -> io::Result<()> {
+ // If we've already waited on this process then the pid can be recycled
+ // and used for another process, and we probably shouldn't be killing
+ // random processes, so just return an error.
+ 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)))
+ }
+ }
+}
+
+/// Unix exit statuses
+#[derive(PartialEq, Eq, Clone, Copy, Debug)]
+pub struct ExitStatus(c_int);
+
+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> {
+ // This assumes that WIFEXITED(status) && WEXITSTATUS==0 corresponds to status==0. This is
+ // true on all actual versions of Unix, is widely assumed, and is specified in SuS
+ // https://pubs.opengroup.org/onlinepubs/9699919799/functions/wait.html . If it is not
+ // true for a platform pretending to be Unix, the tests (our doctests, and also
+ // procsss_unix/tests.rs) will spot it. `ExitStatusError::code` assumes this too.
+ match NonZero_c_int::try_from(self.0) {
+ Ok(failure) => Err(ExitStatusError(failure)),
+ Err(_) => Ok(()),
+ }
+ }
+
+ pub fn code(&self) -> Option<i32> {
+ if self.exited() { Some(libc::WEXITSTATUS(self.0)) } else { None }
+ }
+
+ pub fn signal(&self) -> Option<i32> {
+ if !self.exited() { Some(libc::WTERMSIG(self.0)) } else { None }
+ }
+
+ pub fn core_dumped(&self) -> bool {
+ // This method is not yet properly implemented on VxWorks
+ false
+ }
+
+ pub fn stopped_signal(&self) -> Option<i32> {
+ if libc::WIFSTOPPED(self.0) { Some(libc::WSTOPSIG(self.0)) } else { None }
+ }
+
+ pub fn continued(&self) -> bool {
+ // This method is not yet properly implemented on VxWorks
+ false
+ }
+
+ pub fn into_raw(&self) -> c_int {
+ self.0
+ }
+}
+
+/// Converts a raw `c_int` to a type-safe `ExitStatus` by wrapping it without copying.
+impl From<c_int> for ExitStatus {
+ fn from(a: c_int) -> ExitStatus {
+ ExitStatus(a)
+ }
+}
+
+impl fmt::Display for ExitStatus {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ if let Some(code) = self.code() {
+ write!(f, "exit code: {code}")
+ } else {
+ let signal = self.signal().unwrap();
+ write!(f, "signal: {signal}")
+ }
+ }
+}
+
+#[derive(PartialEq, Eq, Clone, Copy, Debug)]
+pub struct ExitStatusError(NonZero_c_int);
+
+impl Into<ExitStatus> for ExitStatusError {
+ fn into(self) -> ExitStatus {
+ ExitStatus(self.0.into())
+ }
+}
+
+impl ExitStatusError {
+ pub fn code(self) -> Option<NonZeroI32> {
+ ExitStatus(self.0.into()).code().map(|st| st.try_into().unwrap())
+ }
+}
diff --git a/library/std/src/sys/unix/process/zircon.rs b/library/std/src/sys/unix/process/zircon.rs
new file mode 100644
index 000000000..2e596486f
--- /dev/null
+++ b/library/std/src/sys/unix/process/zircon.rs
@@ -0,0 +1,309 @@
+#![allow(non_camel_case_types, unused)]
+
+use crate::io;
+use crate::mem::MaybeUninit;
+use crate::os::raw::c_char;
+
+use libc::{c_int, c_void, size_t};
+
+pub type zx_handle_t = u32;
+pub type zx_vaddr_t = usize;
+pub type zx_rights_t = u32;
+pub type zx_status_t = i32;
+
+pub const ZX_HANDLE_INVALID: zx_handle_t = 0;
+
+pub type zx_time_t = i64;
+pub const ZX_TIME_INFINITE: zx_time_t = i64::MAX;
+
+pub type zx_signals_t = u32;
+
+pub const ZX_OBJECT_SIGNAL_3: zx_signals_t = 1 << 3;
+
+pub const ZX_TASK_TERMINATED: zx_signals_t = ZX_OBJECT_SIGNAL_3;
+
+pub const ZX_RIGHT_SAME_RIGHTS: zx_rights_t = 1 << 31;
+
+// The upper four bits gives the minor version.
+pub type zx_object_info_topic_t = u32;
+
+pub const ZX_INFO_PROCESS: zx_object_info_topic_t = 3 | (1 << 28);
+
+pub type zx_info_process_flags_t = u32;
+
+pub fn zx_cvt<T>(t: T) -> io::Result<T>
+where
+ T: TryInto<zx_status_t> + Copy,
+{
+ if let Ok(status) = TryInto::try_into(t) {
+ if status < 0 { Err(io::Error::from_raw_os_error(status)) } else { Ok(t) }
+ } else {
+ Err(io::Error::last_os_error())
+ }
+}
+
+// Safe wrapper around zx_handle_t
+pub struct Handle {
+ raw: zx_handle_t,
+}
+
+impl Handle {
+ pub fn new(raw: zx_handle_t) -> Handle {
+ Handle { raw }
+ }
+
+ pub fn raw(&self) -> zx_handle_t {
+ self.raw
+ }
+}
+
+impl Drop for Handle {
+ fn drop(&mut self) {
+ unsafe {
+ zx_cvt(zx_handle_close(self.raw)).expect("Failed to close zx_handle_t");
+ }
+ }
+}
+
+// Returned for topic ZX_INFO_PROCESS
+#[derive(Default)]
+#[repr(C)]
+pub struct zx_info_process_t {
+ pub return_code: i64,
+ pub start_time: zx_time_t,
+ pub flags: zx_info_process_flags_t,
+ pub reserved1: u32,
+}
+
+extern "C" {
+ pub fn zx_job_default() -> zx_handle_t;
+
+ pub fn zx_task_kill(handle: zx_handle_t) -> zx_status_t;
+
+ pub fn zx_handle_close(handle: zx_handle_t) -> zx_status_t;
+
+ pub fn zx_handle_duplicate(
+ handle: zx_handle_t,
+ rights: zx_rights_t,
+ out: *const zx_handle_t,
+ ) -> zx_handle_t;
+
+ pub fn zx_object_wait_one(
+ handle: zx_handle_t,
+ signals: zx_signals_t,
+ timeout: zx_time_t,
+ pending: *mut zx_signals_t,
+ ) -> zx_status_t;
+
+ pub fn zx_object_get_info(
+ handle: zx_handle_t,
+ topic: u32,
+ buffer: *mut c_void,
+ buffer_size: size_t,
+ actual_size: *mut size_t,
+ avail: *mut size_t,
+ ) -> zx_status_t;
+}
+
+#[derive(Default)]
+#[repr(C)]
+pub struct fdio_spawn_action_t {
+ pub action: u32,
+ pub reserved0: u32,
+ pub local_fd: i32,
+ pub target_fd: i32,
+ pub reserved1: u64,
+}
+
+extern "C" {
+ pub fn fdio_spawn_etc(
+ job: zx_handle_t,
+ flags: u32,
+ path: *const c_char,
+ argv: *const *const c_char,
+ envp: *const *const c_char,
+ action_count: size_t,
+ actions: *const fdio_spawn_action_t,
+ process: *mut zx_handle_t,
+ err_msg: *mut c_char,
+ ) -> zx_status_t;
+
+ pub fn fdio_fd_clone(fd: c_int, out_handle: *mut zx_handle_t) -> zx_status_t;
+ pub fn fdio_fd_create(handle: zx_handle_t, fd: *mut c_int) -> zx_status_t;
+}
+
+// fdio_spawn_etc flags
+
+pub const FDIO_SPAWN_CLONE_JOB: u32 = 0x0001;
+pub const FDIO_SPAWN_CLONE_LDSVC: u32 = 0x0002;
+pub const FDIO_SPAWN_CLONE_NAMESPACE: u32 = 0x0004;
+pub const FDIO_SPAWN_CLONE_STDIO: u32 = 0x0008;
+pub const FDIO_SPAWN_CLONE_ENVIRON: u32 = 0x0010;
+pub const FDIO_SPAWN_CLONE_UTC_CLOCK: u32 = 0x0020;
+pub const FDIO_SPAWN_CLONE_ALL: u32 = 0xFFFF;
+
+// fdio_spawn_etc actions
+
+pub const FDIO_SPAWN_ACTION_CLONE_FD: u32 = 0x0001;
+pub const FDIO_SPAWN_ACTION_TRANSFER_FD: u32 = 0x0002;
+
+// Errors
+
+#[allow(unused)]
+pub const ERR_INTERNAL: zx_status_t = -1;
+
+// ERR_NOT_SUPPORTED: The operation is not implemented, supported,
+// or enabled.
+#[allow(unused)]
+pub const ERR_NOT_SUPPORTED: zx_status_t = -2;
+
+// ERR_NO_RESOURCES: The system was not able to allocate some resource
+// needed for the operation.
+#[allow(unused)]
+pub const ERR_NO_RESOURCES: zx_status_t = -3;
+
+// ERR_NO_MEMORY: The system was not able to allocate memory needed
+// for the operation.
+#[allow(unused)]
+pub const ERR_NO_MEMORY: zx_status_t = -4;
+
+// ERR_CALL_FAILED: The second phase of zx_channel_call(; did not complete
+// successfully.
+#[allow(unused)]
+pub const ERR_CALL_FAILED: zx_status_t = -5;
+
+// ERR_INTERRUPTED_RETRY: The system call was interrupted, but should be
+// retried. This should not be seen outside of the VDSO.
+#[allow(unused)]
+pub const ERR_INTERRUPTED_RETRY: zx_status_t = -6;
+
+// ======= Parameter errors =======
+// ERR_INVALID_ARGS: an argument is invalid, ex. null pointer
+#[allow(unused)]
+pub const ERR_INVALID_ARGS: zx_status_t = -10;
+
+// ERR_BAD_HANDLE: A specified handle value does not refer to a handle.
+#[allow(unused)]
+pub const ERR_BAD_HANDLE: zx_status_t = -11;
+
+// ERR_WRONG_TYPE: The subject of the operation is the wrong type to
+// perform the operation.
+// Example: Attempting a message_read on a thread handle.
+#[allow(unused)]
+pub const ERR_WRONG_TYPE: zx_status_t = -12;
+
+// ERR_BAD_SYSCALL: The specified syscall number is invalid.
+#[allow(unused)]
+pub const ERR_BAD_SYSCALL: zx_status_t = -13;
+
+// ERR_OUT_OF_RANGE: An argument is outside the valid range for this
+// operation.
+#[allow(unused)]
+pub const ERR_OUT_OF_RANGE: zx_status_t = -14;
+
+// ERR_BUFFER_TOO_SMALL: A caller provided buffer is too small for
+// this operation.
+#[allow(unused)]
+pub const ERR_BUFFER_TOO_SMALL: zx_status_t = -15;
+
+// ======= Precondition or state errors =======
+// ERR_BAD_STATE: operation failed because the current state of the
+// object does not allow it, or a precondition of the operation is
+// not satisfied
+#[allow(unused)]
+pub const ERR_BAD_STATE: zx_status_t = -20;
+
+// ERR_TIMED_OUT: The time limit for the operation elapsed before
+// the operation completed.
+#[allow(unused)]
+pub const ERR_TIMED_OUT: zx_status_t = -21;
+
+// ERR_SHOULD_WAIT: The operation cannot be performed currently but
+// potentially could succeed if the caller waits for a prerequisite
+// to be satisfied, for example waiting for a handle to be readable
+// or writable.
+// Example: Attempting to read from a message pipe that has no
+// messages waiting but has an open remote will return ERR_SHOULD_WAIT.
+// Attempting to read from a message pipe that has no messages waiting
+// and has a closed remote end will return ERR_REMOTE_CLOSED.
+#[allow(unused)]
+pub const ERR_SHOULD_WAIT: zx_status_t = -22;
+
+// ERR_CANCELED: The in-progress operation (e.g., a wait) has been
+// // canceled.
+#[allow(unused)]
+pub const ERR_CANCELED: zx_status_t = -23;
+
+// ERR_PEER_CLOSED: The operation failed because the remote end
+// of the subject of the operation was closed.
+#[allow(unused)]
+pub const ERR_PEER_CLOSED: zx_status_t = -24;
+
+// ERR_NOT_FOUND: The requested entity is not found.
+#[allow(unused)]
+pub const ERR_NOT_FOUND: zx_status_t = -25;
+
+// ERR_ALREADY_EXISTS: An object with the specified identifier
+// already exists.
+// Example: Attempting to create a file when a file already exists
+// with that name.
+#[allow(unused)]
+pub const ERR_ALREADY_EXISTS: zx_status_t = -26;
+
+// ERR_ALREADY_BOUND: The operation failed because the named entity
+// is already owned or controlled by another entity. The operation
+// could succeed later if the current owner releases the entity.
+#[allow(unused)]
+pub const ERR_ALREADY_BOUND: zx_status_t = -27;
+
+// ERR_UNAVAILABLE: The subject of the operation is currently unable
+// to perform the operation.
+// Note: This is used when there's no direct way for the caller to
+// observe when the subject will be able to perform the operation
+// and should thus retry.
+#[allow(unused)]
+pub const ERR_UNAVAILABLE: zx_status_t = -28;
+
+// ======= Permission check errors =======
+// ERR_ACCESS_DENIED: The caller did not have permission to perform
+// the specified operation.
+#[allow(unused)]
+pub const ERR_ACCESS_DENIED: zx_status_t = -30;
+
+// ======= Input-output errors =======
+// ERR_IO: Otherwise unspecified error occurred during I/O.
+#[allow(unused)]
+pub const ERR_IO: zx_status_t = -40;
+
+// ERR_REFUSED: The entity the I/O operation is being performed on
+// rejected the operation.
+// Example: an I2C device NAK'ing a transaction or a disk controller
+// rejecting an invalid command.
+#[allow(unused)]
+pub const ERR_IO_REFUSED: zx_status_t = -41;
+
+// ERR_IO_DATA_INTEGRITY: The data in the operation failed an integrity
+// check and is possibly corrupted.
+// Example: CRC or Parity error.
+#[allow(unused)]
+pub const ERR_IO_DATA_INTEGRITY: zx_status_t = -42;
+
+// ERR_IO_DATA_LOSS: The data in the operation is currently unavailable
+// and may be permanently lost.
+// Example: A disk block is irrecoverably damaged.
+#[allow(unused)]
+pub const ERR_IO_DATA_LOSS: zx_status_t = -43;
+
+// Filesystem specific errors
+#[allow(unused)]
+pub const ERR_BAD_PATH: zx_status_t = -50;
+#[allow(unused)]
+pub const ERR_NOT_DIR: zx_status_t = -51;
+#[allow(unused)]
+pub const ERR_NOT_FILE: zx_status_t = -52;
+// ERR_FILE_BIG: A file exceeds a filesystem-specific size limit.
+#[allow(unused)]
+pub const ERR_FILE_BIG: zx_status_t = -53;
+// ERR_NO_SPACE: Filesystem or device space is exhausted.
+#[allow(unused)]
+pub const ERR_NO_SPACE: zx_status_t = -54;
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-06 02:54:16 +0000