github.com/iDigitalFlame/xmt@v0.5.4/cmd/exec_plan9.go (about)

     1  //go:build plan9
     2  // +build plan9
     3  
     4  // Copyright (C) 2020 - 2023 iDigitalFlame
     5  //
     6  // This program is free software: you can redistribute it and/or modify
     7  // it under the terms of the GNU General Public License as published by
     8  // the Free Software Foundation, either version 3 of the License, or
     9  // any later version.
    10  //
    11  // This program is distributed in the hope that it will be useful,
    12  // but WITHOUT ANY WARRANTY; without even the implied warranty of
    13  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    14  // GNU General Public License for more details.
    15  //
    16  // You should have received a copy of the GNU General Public License
    17  // along with this program.  If not, see <https://www.gnu.org/licenses/>.
    18  //
    19  
    20  package cmd
    21  
    22  import (
    23  	"context"
    24  	"io"
    25  	"os"
    26  	"os/exec"
    27  	"sync/atomic"
    28  	"syscall"
    29  
    30  	"github.com/iDigitalFlame/xmt/cmd/filter"
    31  	"github.com/iDigitalFlame/xmt/util/xerr"
    32  )
    33  
    34  type executable struct {
    35  	e       *exec.Cmd
    36  	r       *os.File
    37  	closers []io.Closer
    38  }
    39  
    40  func (e *executable) close() {
    41  	if len(e.closers) > 0 {
    42  		for i := range e.closers {
    43  			e.closers[i].Close()
    44  		}
    45  	}
    46  }
    47  func (executable) Resume() error {
    48  	return syscall.EINVAL
    49  }
    50  func (executable) Suspend() error {
    51  	return syscall.EINVAL
    52  }
    53  func (e *executable) Pid() uint32 {
    54  	if e.e.ProcessState != nil {
    55  		return uint32(e.e.ProcessState.Pid())
    56  	}
    57  	return uint32(e.e.Process.Pid)
    58  }
    59  
    60  // ResumeProcess will attempt to resume the process via its PID. This will
    61  // attempt to resume the process using an OS-dependent syscall.
    62  //
    63  // This will not affect already running processes.
    64  func ResumeProcess(_ uint32) error {
    65  	return syscall.EINVAL
    66  }
    67  func (executable) Handle() uintptr {
    68  	return 0
    69  }
    70  
    71  // SuspendProcess will attempt to suspend the process via its PID. This will
    72  // attempt to suspend the process using an OS-dependent syscall.
    73  //
    74  // This will not affect already suspended processes.
    75  func SuspendProcess(_ uint32) error {
    76  	return syscall.EINVAL
    77  }
    78  func (e *executable) isStarted() bool {
    79  	return e.e != nil && e.e.Process != nil
    80  }
    81  func (e *executable) isRunning() bool {
    82  	return e.isStarted() && e.e.ProcessState == nil
    83  }
    84  func (e *executable) wait(p *Process) {
    85  	err := e.e.Wait()
    86  	if _, ok := err.(*exec.ExitError); err != nil && !ok {
    87  		p.stopWith(exitStopped, err)
    88  		return
    89  	}
    90  	if err2 := p.ctx.Err(); err2 != nil {
    91  		p.stopWith(exitStopped, err2)
    92  		return
    93  	}
    94  	if atomic.StoreUint32(&p.cookie, atomic.LoadUint32(&p.cookie)|cookieStopped); e.e.ProcessState != nil {
    95  		p.exit = uint32(e.e.ProcessState.Sys().(*syscall.Waitmsg).ExitStatus())
    96  	}
    97  	if p.exit != 0 {
    98  		p.stopWith(p.exit, &ExitError{Exit: p.exit})
    99  		return
   100  	}
   101  	p.stopWith(p.exit, nil)
   102  }
   103  
   104  func (executable) SetToken(_ uintptr)               {}
   105  func (executable) SetFullscreen(_ bool)             {}
   106  func (executable) SetWindowDisplay(_ int)           {}
   107  func (executable) SetWindowTitle(_ string)          {}
   108  func (executable) SetLogin(_, _, _ string)          {}
   109  func (executable) SetWindowSize(_, _ uint32)        {}
   110  func (executable) SetUID(_ int32, _ *Process)       {}
   111  func (executable) SetGID(_ int32, _ *Process)       {}
   112  func (executable) SetWindowPosition(_, _ uint32)    {}
   113  func (executable) SetChroot(_ string, _ *Process)   {}
   114  func (executable) SetNoWindow(_ bool, _ *Process)   {}
   115  func (executable) SetDetached(_ bool, _ *Process)   {}
   116  func (executable) SetSuspended(_ bool, _ *Process)  {}
   117  func (executable) SetNewConsole(_ bool, _ *Process) {}
   118  func (e *executable) kill(x uint32, p *Process) error {
   119  	if p.exit = x; e.e == nil || e.e.Process == nil {
   120  		return p.err
   121  	}
   122  	return e.e.Process.Kill()
   123  }
   124  func (executable) SetParent(_ *filter.Filter, _ *Process) {}
   125  func (e *executable) StdinPipe(p *Process) (io.WriteCloser, error) {
   126  	var err error
   127  	if p.Stdin, e.r, err = os.Pipe(); err != nil {
   128  		return nil, xerr.Wrap("unable to create Pipe", err)
   129  	}
   130  	e.closers = append(e.closers, p.Stdin.(io.Closer))
   131  	return e.r, nil
   132  }
   133  func (e *executable) StdoutPipe(p *Process) (io.ReadCloser, error) {
   134  	r, w, err := os.Pipe()
   135  	if err != nil {
   136  		return nil, xerr.Wrap("unable to create Pipe", err)
   137  	}
   138  	p.Stdout = w
   139  	e.closers = append(e.closers, w)
   140  	return r, nil
   141  }
   142  func (e *executable) StderrPipe(p *Process) (io.ReadCloser, error) {
   143  	r, w, err := os.Pipe()
   144  	if err != nil {
   145  		return nil, xerr.Wrap("unable to create Pipe", err)
   146  	}
   147  	p.Stderr = w
   148  	e.closers = append(e.closers, w)
   149  	return r, nil
   150  }
   151  func (e *executable) start(x context.Context, p *Process, _ bool) error {
   152  	if e.e != nil {
   153  		return ErrAlreadyStarted
   154  	}
   155  	e.e = exec.CommandContext(x, p.Args[0])
   156  	e.e.Dir, e.e.Env = p.Dir, p.Env
   157  	e.e.Stdin, e.e.Stdout, e.e.Stderr = p.Stdin, p.Stdout, p.Stderr
   158  	if e.e.Args = p.Args; !p.split {
   159  		z := os.Environ()
   160  		if e.e.Env == nil {
   161  			e.e.Env = make([]string, 0, len(z))
   162  		}
   163  		e.e.Env = append(e.e.Env, z...)
   164  	}
   165  	if e.r != nil {
   166  		e.r.Close()
   167  		e.r = nil
   168  	}
   169  	if err := e.e.Start(); err != nil {
   170  		return err
   171  	}
   172  	go e.wait(p)
   173  	return nil
   174  }