1 use crate::convert::{TryFrom, TryInto};
5 use crate::num::{NonZeroI32, NonZeroI64};
8 use crate::sys::process::process_common::*;
9 use crate::sys::process::zircon::{zx_handle_t, Handle};
11 use libc::{c_int, size_t};
13 ////////////////////////////////////////////////////////////////////////////////
15 ////////////////////////////////////////////////////////////////////////////////
22 ) -> io::Result<(Process, StdioPipes)> {
23 let envp = self.capture_env();
26 return Err(io::Error::new_const(
27 io::ErrorKind::InvalidInput,
28 &"nul byte found in provided data",
32 let (ours, theirs) = self.setup_io(default, needs_stdin)?;
34 let process_handle = unsafe { self.do_exec(theirs, envp.as_ref())? };
36 Ok((Process { handle: Handle::new(process_handle) }, ours))
39 pub fn exec(&mut self, default: Stdio) -> io::Error {
41 return io::Error::new_const(
42 io::ErrorKind::InvalidInput,
43 &"nul byte found in provided data",
47 match self.setup_io(default, true) {
49 // FIXME: This is tough because we don't support the exec syscalls
59 maybe_envp: Option<&CStringArray>,
60 ) -> io::Result<zx_handle_t> {
61 use crate::sys::process::zircon::*;
63 let envp = match maybe_envp {
64 // None means to clone the current environment, which is done in the
67 Some(envp) => envp.as_ptr(),
70 let make_action = |local_io: &ChildStdio, target_fd| -> io::Result<fdio_spawn_action_t> {
71 if let Some(local_fd) = local_io.fd() {
72 Ok(fdio_spawn_action_t {
73 action: FDIO_SPAWN_ACTION_TRANSFER_FD,
79 if let ChildStdio::Null = local_io {
81 return Ok(Default::default());
84 let mut handle = ZX_HANDLE_INVALID;
85 let status = fdio_fd_clone(target_fd, &mut handle);
86 if status == ERR_INVALID_ARGS || status == ERR_NOT_SUPPORTED {
87 // This descriptor is closed; skip it rather than generating an
89 return Ok(Default::default());
93 let mut cloned_fd = 0;
94 zx_cvt(fdio_fd_create(handle, &mut cloned_fd))?;
96 Ok(fdio_spawn_action_t {
97 action: FDIO_SPAWN_ACTION_TRANSFER_FD,
98 local_fd: cloned_fd as i32,
105 // Clone stdin, stdout, and stderr
106 let action1 = make_action(&stdio.stdin, 0)?;
107 let action2 = make_action(&stdio.stdout, 1)?;
108 let action3 = make_action(&stdio.stderr, 2)?;
109 let actions = [action1, action2, action3];
111 // We don't want FileDesc::drop to be called on any stdio. fdio_spawn_etc
112 // always consumes transferred file descriptors.
115 for callback in self.get_closures().iter_mut() {
119 let mut process_handle: zx_handle_t = 0;
120 zx_cvt(fdio_spawn_etc(
123 | FDIO_SPAWN_CLONE_LDSVC
124 | FDIO_SPAWN_CLONE_NAMESPACE
125 | FDIO_SPAWN_CLONE_ENVIRON // this is ignored when envp is non-null
126 | FDIO_SPAWN_CLONE_UTC_CLOCK,
127 self.get_program_cstr().as_ptr(),
128 self.get_argv().as_ptr(),
130 actions.len() as size_t,
135 // FIXME: See if we want to do something with that err_msg
141 ////////////////////////////////////////////////////////////////////////////////
143 ////////////////////////////////////////////////////////////////////////////////
150 pub fn id(&self) -> u32 {
151 self.handle.raw() as u32
154 pub fn kill(&mut self) -> io::Result<()> {
155 use crate::sys::process::zircon::*;
158 zx_cvt(zx_task_kill(self.handle.raw()))?;
164 pub fn wait(&mut self) -> io::Result<ExitStatus> {
165 use crate::default::Default;
166 use crate::sys::process::zircon::*;
168 let mut proc_info: zx_info_process_t = Default::default();
169 let mut actual: size_t = 0;
170 let mut avail: size_t = 0;
173 zx_cvt(zx_object_wait_one(
179 zx_cvt(zx_object_get_info(
182 &mut proc_info as *mut _ as *mut libc::c_void,
183 mem::size_of::<zx_info_process_t>(),
189 return Err(io::Error::new_const(
190 io::ErrorKind::InvalidData,
191 &"Failed to get exit status of process",
194 Ok(ExitStatus(proc_info.return_code))
197 pub fn try_wait(&mut self) -> io::Result<Option<ExitStatus>> {
198 use crate::default::Default;
199 use crate::sys::process::zircon::*;
201 let mut proc_info: zx_info_process_t = Default::default();
202 let mut actual: size_t = 0;
203 let mut avail: size_t = 0;
207 zx_object_wait_one(self.handle.raw(), ZX_TASK_TERMINATED, 0, ptr::null_mut());
210 x if x == ERR_TIMED_OUT => {
214 panic!("Failed to wait on process handle: {}", status);
217 zx_cvt(zx_object_get_info(
220 &mut proc_info as *mut _ as *mut libc::c_void,
221 mem::size_of::<zx_info_process_t>(),
227 return Err(io::Error::new_const(
228 io::ErrorKind::InvalidData,
229 &"Failed to get exit status of process",
232 Ok(Some(ExitStatus(proc_info.return_code)))
236 #[derive(PartialEq, Eq, Clone, Copy, Debug)]
237 pub struct ExitStatus(i64);
240 pub fn exit_ok(&self) -> Result<(), ExitStatusError> {
241 match NonZeroI64::try_from(self.0) {
242 /* was nonzero */ Ok(failure) => Err(ExitStatusError(failure)),
243 /* was zero, couldn't convert */ Err(_) => Ok(()),
247 pub fn code(&self) -> Option<i32> {
248 // FIXME: support extracting return code as an i64
249 self.0.try_into().ok()
252 pub fn signal(&self) -> Option<i32> {
256 // FIXME: The actually-Unix implementation in process_unix.rs uses WSTOPSIG, WCOREDUMP et al.
257 // I infer from the implementation of `success`, `code` and `signal` above that these are not
258 // available on Fuchsia.
260 // It does not appear that Fuchsia is Unix-like enough to implement ExitStatus (or indeed many
261 // other things from std::os::unix) properly. This veneer is always going to be a bodge. So
262 // while I don't know if these implementations are actually correct, I think they will do for
264 pub fn core_dumped(&self) -> bool {
267 pub fn stopped_signal(&self) -> Option<i32> {
270 pub fn continued(&self) -> bool {
274 pub fn into_raw(&self) -> c_int {
275 // We don't know what someone who calls into_raw() will do with this value, but it should
276 // have the conventional Unix representation. Despite the fact that this is not
277 // standardised in SuS or POSIX, all Unix systems encode the signal and exit status the
278 // same way. (Ie the WIFEXITED, WEXITSTATUS etc. macros have identical behaviour on every
281 // The caller of `std::os::unix::into_raw` is probably wanting a Unix exit status, and may
282 // do their own shifting and masking, or even pass the status to another computer running a
283 // different Unix variant.
285 // The other view would be to say that the caller on Fuchsia ought to know that `into_raw`
286 // will give a raw Fuchsia status (whatever that is - I don't know, personally). That is
287 // not possible here becaause we must return a c_int because that's what Unix (including
288 // SuS and POSIX) say a wait status is, but Fuchsia apparently uses a u64, so it won't
291 // It seems to me that that the right answer would be to provide std::os::fuchsia with its
292 // own ExitStatusExt, rather that trying to provide a not very convincing imitation of
293 // Unix. Ie, std::os::unix::process:ExitStatusExt ought not to exist on Fuchsia. But
294 // fixing this up that is beyond the scope of my efforts now.
295 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.");
296 let wait_status_as_if_unix = (exit_status_as_if_unix as c_int) << 8;
297 wait_status_as_if_unix
301 /// Converts a raw `c_int` to a type-safe `ExitStatus` by wrapping it without copying.
302 impl From<c_int> for ExitStatus {
303 fn from(a: c_int) -> ExitStatus {
308 impl fmt::Display for ExitStatus {
309 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
310 write!(f, "exit code: {}", self.0)
314 #[derive(PartialEq, Eq, Clone, Copy, Debug)]
315 pub struct ExitStatusError(NonZeroI64);
317 impl Into<ExitStatus> for ExitStatusError {
318 fn into(self) -> ExitStatus {
319 ExitStatus(self.0.into())
323 impl ExitStatusError {
324 pub fn code(self) -> Option<NonZeroI32> {
325 // fixme: affected by the same bug as ExitStatus::code()
326 ExitStatus(self.0.into()).code().map(|st| st.try_into().unwrap())