/
process_fuchsia.rs
195 lines (162 loc) · 6.83 KB
/
process_fuchsia.rs
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use crate::io;
use crate::mem;
use crate::ptr;
use crate::sys::process::zircon::{Handle, zx_handle_t};
use crate::sys::process::process_common::*;
use libc::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::Error::new(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::Error::new(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
self.get_argv()[0], 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::Error::new(io::ErrorKind::InvalidData,
"Failed to get exit status of process"));
}
Ok(ExitStatus::new(proc_info.rec.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::Error::new(io::ErrorKind::InvalidData,
"Failed to get exit status of process"));
}
Ok(Some(ExitStatus::new(proc_info.rec.return_code)))
}
}