src/libstd/sys/unix/process/process_fuchsia.rs

   1 use crate::io;
   2 use crate::mem;
   3 use crate::ptr;
   4
   5 use crate::sys::process::zircon::{Handle, zx_handle_t};
   6 use crate::sys::process::process_common::*;
   7
   8 use libc::size_t;
   9
  10 ////////////////////////////////////////////////////////////////////////////////
  11 // Command
  12 ////////////////////////////////////////////////////////////////////////////////
  13
  14 impl Command {
  15     pub fn spawn(&mut self, default: Stdio, needs_stdin: bool)
  16                  -> io::Result<(Process, StdioPipes)> {
  17         let envp = self.capture_env();
  18
  19         if self.saw_nul() {
  20             return Err(io::Error::new(io::ErrorKind::InvalidInput,
  21                                       "nul byte found in provided data"));
  22         }
  23
  24         let (ours, theirs) = self.setup_io(default, needs_stdin)?;
  25
  26         let process_handle = unsafe { self.do_exec(theirs, envp.as_ref())? };
  27
  28         Ok((Process { handle: Handle::new(process_handle) }, ours))
  29     }
  30
  31     pub fn exec(&mut self, default: Stdio) -> io::Error {
  32         if self.saw_nul() {
  33             return io::Error::new(io::ErrorKind::InvalidInput,
  34                                   "nul byte found in provided data")
  35         }
  36
  37         match self.setup_io(default, true) {
  38             Ok((_, _)) => {
  39                 // FIXME: This is tough because we don't support the exec syscalls
  40                 unimplemented!();
  41             },
  42             Err(e) => e,
  43         }
  44     }
  45
  46     unsafe fn do_exec(&mut self, stdio: ChildPipes, maybe_envp: Option<&CStringArray>)
  47                       -> io::Result<zx_handle_t> {
  48         use crate::sys::process::zircon::*;
  49
  50         let envp = match maybe_envp {
  51             Some(envp) => envp.as_ptr(),
  52             None => ptr::null(),
  53         };
  54
  55         let transfer_or_clone = |opt_fd, target_fd| if let Some(local_fd) = opt_fd {
  56             fdio_spawn_action_t {
  57                 action: FDIO_SPAWN_ACTION_TRANSFER_FD,
  58                 local_fd,
  59                 target_fd,
  60                 ..Default::default()
  61             }
  62         } else {
  63             fdio_spawn_action_t {
  64                 action: FDIO_SPAWN_ACTION_CLONE_FD,
  65                 local_fd: target_fd,
  66                 target_fd,
  67                 ..Default::default()
  68             }
  69         };
  70
  71         // Clone stdin, stdout, and stderr
  72         let action1 = transfer_or_clone(stdio.stdin.fd(), 0);
  73         let action2 = transfer_or_clone(stdio.stdout.fd(), 1);
  74         let action3 = transfer_or_clone(stdio.stderr.fd(), 2);
  75         let actions = [action1, action2, action3];
  76
  77         // We don't want FileDesc::drop to be called on any stdio. fdio_spawn_etc
  78         // always consumes transferred file descriptors.
  79         mem::forget(stdio);
  80
  81         for callback in self.get_closures().iter_mut() {
  82             callback()?;
  83         }
  84
  85         let mut process_handle: zx_handle_t = 0;
  86         zx_cvt(fdio_spawn_etc(
  87             0,
  88             FDIO_SPAWN_CLONE_JOB | FDIO_SPAWN_CLONE_LDSVC | FDIO_SPAWN_CLONE_NAMESPACE,
  89             self.get_argv()[0], self.get_argv().as_ptr(), envp, 3, actions.as_ptr(),
  90             &mut process_handle,
  91             ptr::null_mut(),
  92         ))?;
  93         // FIXME: See if we want to do something with that err_msg
  94
  95         Ok(process_handle)
  96     }
  97 }
  98
  99 ////////////////////////////////////////////////////////////////////////////////
 100 // Processes
 101 ////////////////////////////////////////////////////////////////////////////////
 102
 103 pub struct Process {
 104     handle: Handle,
 105 }
 106
 107 impl Process {
 108     pub fn id(&self) -> u32 {
 109         self.handle.raw() as u32
 110     }
 111
 112     pub fn kill(&mut self) -> io::Result<()> {
 113         use crate::sys::process::zircon::*;
 114
 115         unsafe { zx_cvt(zx_task_kill(self.handle.raw()))?; }
 116
 117         Ok(())
 118     }
 119
 120     pub fn wait(&mut self) -> io::Result<ExitStatus> {
 121         use crate::default::Default;
 122         use crate::sys::process::zircon::*;
 123
 124         let mut proc_info: zx_info_process_t = Default::default();
 125         let mut actual: size_t = 0;
 126         let mut avail: size_t = 0;
 127
 128         unsafe {
 129             zx_cvt(zx_object_wait_one(self.handle.raw(), ZX_TASK_TERMINATED,
 130                                       ZX_TIME_INFINITE, ptr::null_mut()))?;
 131             zx_cvt(zx_object_get_info(self.handle.raw(), ZX_INFO_PROCESS,
 132                                       &mut proc_info as *mut _ as *mut libc::c_void,
 133                                       mem::size_of::<zx_info_process_t>(), &mut actual,
 134                                       &mut avail))?;
 135         }
 136         if actual != 1 {
 137             return Err(io::Error::new(io::ErrorKind::InvalidData,
 138                                       "Failed to get exit status of process"));
 139         }
 140         Ok(ExitStatus::new(proc_info.rec.return_code))
 141     }
 142
 143     pub fn try_wait(&mut self) -> io::Result<Option<ExitStatus>> {
 144         use crate::default::Default;
 145         use crate::sys::process::zircon::*;
 146
 147         let mut proc_info: zx_info_process_t = Default::default();
 148         let mut actual: size_t = 0;
 149         let mut avail: size_t = 0;
 150
 151         unsafe {
 152             let status = zx_object_wait_one(self.handle.raw(), ZX_TASK_TERMINATED,
 153                                             0, ptr::null_mut());
 154             match status {
 155                 0 => { }, // Success
 156                 x if x == ERR_TIMED_OUT => {
 157                     return Ok(None);
 158                 },
 159                 _ => { panic!("Failed to wait on process handle: {}", status); },
 160             }
 161             zx_cvt(zx_object_get_info(self.handle.raw(), ZX_INFO_PROCESS,
 162                                       &mut proc_info as *mut _ as *mut libc::c_void,
 163                                       mem::size_of::<zx_info_process_t>(), &mut actual,
 164                                       &mut avail))?;
 165         }
 166         if actual != 1 {
 167             return Err(io::Error::new(io::ErrorKind::InvalidData,
 168                                       "Failed to get exit status of process"));
 169         }
 170         Ok(Some(ExitStatus::new(proc_info.rec.return_code)))
 171     }
 172 }