89f85cbfa7
As per #117276, this moves the implementations of `Process` and friends out of the `pal` module and into the `sys` module, removing quite a lot of error-prone `#[path]` imports in the process (hah, get it ;-)). I've also made the `zircon` module a dedicated submodule of `pal::unix`, hopefully we can move some other definitions there as well (they are currently quite a lot of duplications in `sys`). Also, the `ensure_no_nuls` function on Windows now lives in `sys::pal::windows` – it's not specific to processes and shared by the argument implementation.
674 lines
20 KiB
Rust
674 lines
20 KiB
Rust
#[cfg(all(test, not(target_os = "emscripten")))]
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mod tests;
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use libc::{EXIT_FAILURE, EXIT_SUCCESS, c_char, c_int, gid_t, pid_t, uid_t};
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use crate::collections::BTreeMap;
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use crate::ffi::{CStr, CString, OsStr, OsString};
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use crate::os::unix::prelude::*;
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use crate::path::Path;
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use crate::sys::fd::FileDesc;
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use crate::sys::fs::File;
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#[cfg(not(target_os = "fuchsia"))]
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use crate::sys::fs::OpenOptions;
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use crate::sys::pipe::{self, AnonPipe};
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use crate::sys_common::process::{CommandEnv, CommandEnvs};
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use crate::sys_common::{FromInner, IntoInner};
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use crate::{fmt, io, ptr};
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cfg_if::cfg_if! {
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if #[cfg(target_os = "fuchsia")] {
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// fuchsia doesn't have /dev/null
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} else if #[cfg(target_os = "vxworks")] {
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const DEV_NULL: &CStr = c"/null";
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} else {
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const DEV_NULL: &CStr = c"/dev/null";
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}
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}
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// Android with api less than 21 define sig* functions inline, so it is not
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// available for dynamic link. Implementing sigemptyset and sigaddset allow us
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// to support older Android version (independent of libc version).
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// The following implementations are based on
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// https://github.com/aosp-mirror/platform_bionic/blob/ad8dcd6023294b646e5a8288c0ed431b0845da49/libc/include/android/legacy_signal_inlines.h
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cfg_if::cfg_if! {
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if #[cfg(target_os = "android")] {
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#[allow(dead_code)]
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pub unsafe fn sigemptyset(set: *mut libc::sigset_t) -> libc::c_int {
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set.write_bytes(0u8, 1);
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return 0;
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}
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#[allow(dead_code)]
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pub unsafe fn sigaddset(set: *mut libc::sigset_t, signum: libc::c_int) -> libc::c_int {
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use crate::slice;
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use libc::{c_ulong, sigset_t};
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// The implementations from bionic (android libc) type pun `sigset_t` as an
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// array of `c_ulong`. This works, but lets add a smoke check to make sure
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// that doesn't change.
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const _: () = assert!(
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align_of::<c_ulong>() == align_of::<sigset_t>()
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&& (size_of::<sigset_t>() % size_of::<c_ulong>()) == 0
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);
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let bit = (signum - 1) as usize;
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if set.is_null() || bit >= (8 * size_of::<sigset_t>()) {
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crate::sys::pal::os::set_errno(libc::EINVAL);
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return -1;
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}
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let raw = slice::from_raw_parts_mut(
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set as *mut c_ulong,
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size_of::<sigset_t>() / size_of::<c_ulong>(),
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);
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const LONG_BIT: usize = size_of::<c_ulong>() * 8;
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raw[bit / LONG_BIT] |= 1 << (bit % LONG_BIT);
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return 0;
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}
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} else {
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#[allow(unused_imports)]
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pub use libc::{sigemptyset, sigaddset};
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}
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}
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////////////////////////////////////////////////////////////////////////////////
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// Command
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////////////////////////////////////////////////////////////////////////////////
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pub struct Command {
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program: CString,
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args: Vec<CString>,
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/// Exactly what will be passed to `execvp`.
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///
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/// First element is a pointer to `program`, followed by pointers to
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/// `args`, followed by a `null`. Be careful when modifying `program` or
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/// `args` to properly update this as well.
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argv: Argv,
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env: CommandEnv,
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program_kind: ProgramKind,
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cwd: Option<CString>,
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uid: Option<uid_t>,
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gid: Option<gid_t>,
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saw_nul: bool,
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closures: Vec<Box<dyn FnMut() -> io::Result<()> + Send + Sync>>,
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groups: Option<Box<[gid_t]>>,
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stdin: Option<Stdio>,
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stdout: Option<Stdio>,
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stderr: Option<Stdio>,
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#[cfg(target_os = "linux")]
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create_pidfd: bool,
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pgroup: Option<pid_t>,
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}
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// Create a new type for argv, so that we can make it `Send` and `Sync`
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struct Argv(Vec<*const c_char>);
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// It is safe to make `Argv` `Send` and `Sync`, because it contains
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// pointers to memory owned by `Command.args`
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unsafe impl Send for Argv {}
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unsafe impl Sync for Argv {}
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// passed back to std::process with the pipes connected to the child, if any
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// were requested
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pub struct StdioPipes {
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pub stdin: Option<AnonPipe>,
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pub stdout: Option<AnonPipe>,
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pub stderr: Option<AnonPipe>,
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}
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// passed to do_exec() with configuration of what the child stdio should look
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// like
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#[cfg_attr(target_os = "vita", allow(dead_code))]
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pub struct ChildPipes {
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pub stdin: ChildStdio,
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pub stdout: ChildStdio,
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pub stderr: ChildStdio,
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}
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pub enum ChildStdio {
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Inherit,
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Explicit(c_int),
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Owned(FileDesc),
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// On Fuchsia, null stdio is the default, so we simply don't specify
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// any actions at the time of spawning.
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#[cfg(target_os = "fuchsia")]
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Null,
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}
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#[derive(Debug)]
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pub enum Stdio {
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Inherit,
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Null,
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MakePipe,
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Fd(FileDesc),
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StaticFd(BorrowedFd<'static>),
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}
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#[derive(Copy, Clone, Debug, Eq, PartialEq)]
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pub enum ProgramKind {
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/// A program that would be looked up on the PATH (e.g. `ls`)
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PathLookup,
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/// A relative path (e.g. `my-dir/foo`, `../foo`, `./foo`)
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Relative,
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/// An absolute path.
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Absolute,
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}
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impl ProgramKind {
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fn new(program: &OsStr) -> Self {
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if program.as_encoded_bytes().starts_with(b"/") {
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Self::Absolute
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} else if program.as_encoded_bytes().contains(&b'/') {
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// If the program has more than one component in it, it is a relative path.
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Self::Relative
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} else {
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Self::PathLookup
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}
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}
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}
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impl Command {
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#[cfg(not(target_os = "linux"))]
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pub fn new(program: &OsStr) -> Command {
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let mut saw_nul = false;
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let program_kind = ProgramKind::new(program.as_ref());
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let program = os2c(program, &mut saw_nul);
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Command {
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argv: Argv(vec![program.as_ptr(), ptr::null()]),
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args: vec![program.clone()],
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program,
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program_kind,
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env: Default::default(),
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cwd: None,
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uid: None,
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gid: None,
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saw_nul,
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closures: Vec::new(),
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groups: None,
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stdin: None,
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stdout: None,
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stderr: None,
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pgroup: None,
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}
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}
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#[cfg(target_os = "linux")]
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pub fn new(program: &OsStr) -> Command {
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let mut saw_nul = false;
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let program_kind = ProgramKind::new(program.as_ref());
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let program = os2c(program, &mut saw_nul);
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Command {
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argv: Argv(vec![program.as_ptr(), ptr::null()]),
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args: vec![program.clone()],
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program,
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program_kind,
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env: Default::default(),
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cwd: None,
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uid: None,
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gid: None,
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saw_nul,
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closures: Vec::new(),
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groups: None,
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stdin: None,
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stdout: None,
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stderr: None,
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create_pidfd: false,
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pgroup: None,
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}
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}
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pub fn set_arg_0(&mut self, arg: &OsStr) {
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// Set a new arg0
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let arg = os2c(arg, &mut self.saw_nul);
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debug_assert!(self.argv.0.len() > 1);
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self.argv.0[0] = arg.as_ptr();
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self.args[0] = arg;
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}
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pub fn arg(&mut self, arg: &OsStr) {
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// Overwrite the trailing null pointer in `argv` and then add a new null
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// pointer.
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let arg = os2c(arg, &mut self.saw_nul);
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self.argv.0[self.args.len()] = arg.as_ptr();
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self.argv.0.push(ptr::null());
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// Also make sure we keep track of the owned value to schedule a
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// destructor for this memory.
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self.args.push(arg);
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}
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pub fn cwd(&mut self, dir: &OsStr) {
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self.cwd = Some(os2c(dir, &mut self.saw_nul));
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}
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pub fn uid(&mut self, id: uid_t) {
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self.uid = Some(id);
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}
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pub fn gid(&mut self, id: gid_t) {
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self.gid = Some(id);
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}
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pub fn groups(&mut self, groups: &[gid_t]) {
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self.groups = Some(Box::from(groups));
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}
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pub fn pgroup(&mut self, pgroup: pid_t) {
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self.pgroup = Some(pgroup);
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}
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#[cfg(target_os = "linux")]
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pub fn create_pidfd(&mut self, val: bool) {
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self.create_pidfd = val;
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}
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#[cfg(not(target_os = "linux"))]
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#[allow(dead_code)]
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pub fn get_create_pidfd(&self) -> bool {
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false
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}
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#[cfg(target_os = "linux")]
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pub fn get_create_pidfd(&self) -> bool {
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self.create_pidfd
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}
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pub fn saw_nul(&self) -> bool {
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self.saw_nul
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}
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pub fn get_program(&self) -> &OsStr {
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OsStr::from_bytes(self.program.as_bytes())
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}
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#[allow(dead_code)]
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pub fn get_program_kind(&self) -> ProgramKind {
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self.program_kind
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}
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pub fn get_args(&self) -> CommandArgs<'_> {
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let mut iter = self.args.iter();
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iter.next();
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CommandArgs { iter }
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}
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pub fn get_envs(&self) -> CommandEnvs<'_> {
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self.env.iter()
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}
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pub fn get_current_dir(&self) -> Option<&Path> {
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self.cwd.as_ref().map(|cs| Path::new(OsStr::from_bytes(cs.as_bytes())))
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}
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pub fn get_argv(&self) -> &Vec<*const c_char> {
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&self.argv.0
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}
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pub fn get_program_cstr(&self) -> &CStr {
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&*self.program
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}
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#[allow(dead_code)]
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pub fn get_cwd(&self) -> Option<&CStr> {
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self.cwd.as_deref()
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}
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#[allow(dead_code)]
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pub fn get_uid(&self) -> Option<uid_t> {
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self.uid
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}
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#[allow(dead_code)]
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pub fn get_gid(&self) -> Option<gid_t> {
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self.gid
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}
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#[allow(dead_code)]
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pub fn get_groups(&self) -> Option<&[gid_t]> {
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self.groups.as_deref()
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}
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#[allow(dead_code)]
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pub fn get_pgroup(&self) -> Option<pid_t> {
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self.pgroup
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}
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pub fn get_closures(&mut self) -> &mut Vec<Box<dyn FnMut() -> io::Result<()> + Send + Sync>> {
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&mut self.closures
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}
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pub unsafe fn pre_exec(&mut self, f: Box<dyn FnMut() -> io::Result<()> + Send + Sync>) {
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self.closures.push(f);
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}
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pub fn stdin(&mut self, stdin: Stdio) {
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self.stdin = Some(stdin);
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}
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pub fn stdout(&mut self, stdout: Stdio) {
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self.stdout = Some(stdout);
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}
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pub fn stderr(&mut self, stderr: Stdio) {
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self.stderr = Some(stderr);
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}
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pub fn env_mut(&mut self) -> &mut CommandEnv {
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&mut self.env
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}
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pub fn capture_env(&mut self) -> Option<CStringArray> {
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let maybe_env = self.env.capture_if_changed();
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maybe_env.map(|env| construct_envp(env, &mut self.saw_nul))
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}
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#[allow(dead_code)]
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pub fn env_saw_path(&self) -> bool {
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self.env.have_changed_path()
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}
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#[allow(dead_code)]
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pub fn program_is_path(&self) -> bool {
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self.program.to_bytes().contains(&b'/')
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}
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pub fn setup_io(
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&self,
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default: Stdio,
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needs_stdin: bool,
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) -> io::Result<(StdioPipes, ChildPipes)> {
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let null = Stdio::Null;
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let default_stdin = if needs_stdin { &default } else { &null };
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let stdin = self.stdin.as_ref().unwrap_or(default_stdin);
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let stdout = self.stdout.as_ref().unwrap_or(&default);
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let stderr = self.stderr.as_ref().unwrap_or(&default);
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let (their_stdin, our_stdin) = stdin.to_child_stdio(true)?;
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let (their_stdout, our_stdout) = stdout.to_child_stdio(false)?;
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let (their_stderr, our_stderr) = stderr.to_child_stdio(false)?;
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let ours = StdioPipes { stdin: our_stdin, stdout: our_stdout, stderr: our_stderr };
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let theirs = ChildPipes { stdin: their_stdin, stdout: their_stdout, stderr: their_stderr };
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Ok((ours, theirs))
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}
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}
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fn os2c(s: &OsStr, saw_nul: &mut bool) -> CString {
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CString::new(s.as_bytes()).unwrap_or_else(|_e| {
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*saw_nul = true;
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c"<string-with-nul>".to_owned()
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})
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}
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// Helper type to manage ownership of the strings within a C-style array.
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pub struct CStringArray {
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items: Vec<CString>,
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ptrs: Vec<*const c_char>,
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}
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impl CStringArray {
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pub fn with_capacity(capacity: usize) -> Self {
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let mut result = CStringArray {
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items: Vec::with_capacity(capacity),
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ptrs: Vec::with_capacity(capacity + 1),
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};
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result.ptrs.push(ptr::null());
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result
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}
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pub fn push(&mut self, item: CString) {
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let l = self.ptrs.len();
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self.ptrs[l - 1] = item.as_ptr();
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self.ptrs.push(ptr::null());
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self.items.push(item);
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}
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pub fn as_ptr(&self) -> *const *const c_char {
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self.ptrs.as_ptr()
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}
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}
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fn construct_envp(env: BTreeMap<OsString, OsString>, saw_nul: &mut bool) -> CStringArray {
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let mut result = CStringArray::with_capacity(env.len());
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for (mut k, v) in env {
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// Reserve additional space for '=' and null terminator
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k.reserve_exact(v.len() + 2);
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k.push("=");
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k.push(&v);
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// Add the new entry into the array
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if let Ok(item) = CString::new(k.into_vec()) {
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result.push(item);
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} else {
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*saw_nul = true;
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}
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}
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result
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}
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impl Stdio {
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pub fn to_child_stdio(&self, readable: bool) -> io::Result<(ChildStdio, Option<AnonPipe>)> {
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match *self {
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Stdio::Inherit => Ok((ChildStdio::Inherit, None)),
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// Make sure that the source descriptors are not an stdio
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// descriptor, otherwise the order which we set the child's
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// descriptors may blow away a descriptor which we are hoping to
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// save. For example, suppose we want the child's stderr to be the
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// parent's stdout, and the child's stdout to be the parent's
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// stderr. No matter which we dup first, the second will get
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// overwritten prematurely.
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Stdio::Fd(ref fd) => {
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if fd.as_raw_fd() >= 0 && fd.as_raw_fd() <= libc::STDERR_FILENO {
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Ok((ChildStdio::Owned(fd.duplicate()?), None))
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} else {
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Ok((ChildStdio::Explicit(fd.as_raw_fd()), None))
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}
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}
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Stdio::StaticFd(fd) => {
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|
let fd = FileDesc::from_inner(fd.try_clone_to_owned()?);
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Ok((ChildStdio::Owned(fd), None))
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}
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Stdio::MakePipe => {
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let (reader, writer) = pipe::anon_pipe()?;
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let (ours, theirs) = if readable { (writer, reader) } else { (reader, writer) };
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Ok((ChildStdio::Owned(theirs.into_inner()), Some(ours)))
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}
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#[cfg(not(target_os = "fuchsia"))]
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Stdio::Null => {
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let mut opts = OpenOptions::new();
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opts.read(readable);
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opts.write(!readable);
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let fd = File::open_c(DEV_NULL, &opts)?;
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Ok((ChildStdio::Owned(fd.into_inner()), None))
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}
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#[cfg(target_os = "fuchsia")]
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Stdio::Null => Ok((ChildStdio::Null, None)),
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}
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}
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}
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impl From<AnonPipe> for Stdio {
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fn from(pipe: AnonPipe) -> Stdio {
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Stdio::Fd(pipe.into_inner())
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}
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}
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impl From<FileDesc> for Stdio {
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fn from(fd: FileDesc) -> Stdio {
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|
Stdio::Fd(fd)
|
|
}
|
|
}
|
|
|
|
impl From<File> for Stdio {
|
|
fn from(file: File) -> Stdio {
|
|
Stdio::Fd(file.into_inner())
|
|
}
|
|
}
|
|
|
|
impl From<io::Stdout> for Stdio {
|
|
fn from(_: io::Stdout) -> Stdio {
|
|
// This ought really to be is Stdio::StaticFd(input_argument.as_fd()).
|
|
// But AsFd::as_fd takes its argument by reference, and yields
|
|
// a bounded lifetime, so it's no use here. There is no AsStaticFd.
|
|
//
|
|
// Additionally AsFd is only implemented for the *locked* versions.
|
|
// We don't want to lock them here. (The implications of not locking
|
|
// are the same as those for process::Stdio::inherit().)
|
|
//
|
|
// Arguably the hypothetical AsStaticFd and AsFd<'static>
|
|
// should be implemented for io::Stdout, not just for StdoutLocked.
|
|
Stdio::StaticFd(unsafe { BorrowedFd::borrow_raw(libc::STDOUT_FILENO) })
|
|
}
|
|
}
|
|
|
|
impl From<io::Stderr> for Stdio {
|
|
fn from(_: io::Stderr) -> Stdio {
|
|
Stdio::StaticFd(unsafe { BorrowedFd::borrow_raw(libc::STDERR_FILENO) })
|
|
}
|
|
}
|
|
|
|
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 {
|
|
// show all attributes but `self.closures` which does not implement `Debug`
|
|
// and `self.argv` which is not useful for debugging
|
|
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
|
|
if f.alternate() {
|
|
let mut debug_command = f.debug_struct("Command");
|
|
debug_command.field("program", &self.program).field("args", &self.args);
|
|
if !self.env.is_unchanged() {
|
|
debug_command.field("env", &self.env);
|
|
}
|
|
|
|
if self.cwd.is_some() {
|
|
debug_command.field("cwd", &self.cwd);
|
|
}
|
|
if self.uid.is_some() {
|
|
debug_command.field("uid", &self.uid);
|
|
}
|
|
if self.gid.is_some() {
|
|
debug_command.field("gid", &self.gid);
|
|
}
|
|
|
|
if self.groups.is_some() {
|
|
debug_command.field("groups", &self.groups);
|
|
}
|
|
|
|
if self.stdin.is_some() {
|
|
debug_command.field("stdin", &self.stdin);
|
|
}
|
|
if self.stdout.is_some() {
|
|
debug_command.field("stdout", &self.stdout);
|
|
}
|
|
if self.stderr.is_some() {
|
|
debug_command.field("stderr", &self.stderr);
|
|
}
|
|
if self.pgroup.is_some() {
|
|
debug_command.field("pgroup", &self.pgroup);
|
|
}
|
|
|
|
#[cfg(target_os = "linux")]
|
|
{
|
|
debug_command.field("create_pidfd", &self.create_pidfd);
|
|
}
|
|
|
|
debug_command.finish()
|
|
} else {
|
|
if let Some(ref cwd) = self.cwd {
|
|
write!(f, "cd {cwd:?} && ")?;
|
|
}
|
|
if self.env.does_clear() {
|
|
write!(f, "env -i ")?;
|
|
// Altered env vars will be printed next, that should exactly work as expected.
|
|
} else {
|
|
// Removed env vars need the command to be wrapped in `env`.
|
|
let mut any_removed = false;
|
|
for (key, value_opt) in self.get_envs() {
|
|
if value_opt.is_none() {
|
|
if !any_removed {
|
|
write!(f, "env ")?;
|
|
any_removed = true;
|
|
}
|
|
write!(f, "-u {} ", key.to_string_lossy())?;
|
|
}
|
|
}
|
|
}
|
|
// Altered env vars can just be added in front of the program.
|
|
for (key, value_opt) in self.get_envs() {
|
|
if let Some(value) = value_opt {
|
|
write!(f, "{}={value:?} ", key.to_string_lossy())?;
|
|
}
|
|
}
|
|
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()
|
|
}
|
|
}
|