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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())
}
}
|
