File size: 3,399 Bytes
e36aeda | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 | // Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package os
import (
"internal/strconv"
"syscall"
"time"
)
// The only signal values guaranteed to be present in the os package
// on all systems are Interrupt (send the process an interrupt) and
// Kill (force the process to exit). Interrupt is not implemented on
// Windows; using it with [os.Process.Signal] will return an error.
var (
Interrupt Signal = syscall.Note("interrupt")
Kill Signal = syscall.Note("kill")
)
func startProcess(name string, argv []string, attr *ProcAttr) (p *Process, err error) {
sysattr := &syscall.ProcAttr{
Dir: attr.Dir,
Env: attr.Env,
Sys: attr.Sys,
}
sysattr.Files = make([]uintptr, 0, len(attr.Files))
for _, f := range attr.Files {
sysattr.Files = append(sysattr.Files, f.Fd())
}
pid, _, e := syscall.StartProcess(name, argv, sysattr)
if e != nil {
return nil, &PathError{Op: "fork/exec", Path: name, Err: e}
}
return newPIDProcess(pid), nil
}
func (p *Process) writeProcFile(file string, data string) error {
f, e := OpenFile("/proc/"+strconv.Itoa(p.Pid)+"/"+file, O_WRONLY, 0)
if e != nil {
return e
}
defer f.Close()
_, e = f.Write([]byte(data))
return e
}
func (p *Process) signal(sig Signal) error {
switch p.pidStatus() {
case statusDone:
return ErrProcessDone
case statusReleased:
return syscall.ENOENT
}
if e := p.writeProcFile("note", sig.String()); e != nil {
return NewSyscallError("signal", e)
}
return nil
}
func (p *Process) kill() error {
return p.signal(Kill)
}
func (p *Process) wait() (ps *ProcessState, err error) {
var waitmsg syscall.Waitmsg
switch p.pidStatus() {
case statusReleased:
return nil, ErrInvalid
}
err = syscall.WaitProcess(p.Pid, &waitmsg)
if err != nil {
return nil, NewSyscallError("wait", err)
}
p.doRelease(statusDone)
ps = &ProcessState{
pid: waitmsg.Pid,
status: &waitmsg,
}
return ps, nil
}
func (p *Process) withHandle(_ func(handle uintptr)) error {
return ErrNoHandle
}
func findProcess(pid int) (p *Process, err error) {
// NOOP for Plan 9.
return newPIDProcess(pid), nil
}
// ProcessState stores information about a process, as reported by Wait.
type ProcessState struct {
pid int // The process's id.
status *syscall.Waitmsg // System-dependent status info.
}
// Pid returns the process id of the exited process.
func (p *ProcessState) Pid() int {
return p.pid
}
func (p *ProcessState) exited() bool {
return p.status.Exited()
}
func (p *ProcessState) success() bool {
return p.status.ExitStatus() == 0
}
func (p *ProcessState) sys() any {
return p.status
}
func (p *ProcessState) sysUsage() any {
return p.status
}
func (p *ProcessState) userTime() time.Duration {
return time.Duration(p.status.Time[0]) * time.Millisecond
}
func (p *ProcessState) systemTime() time.Duration {
return time.Duration(p.status.Time[1]) * time.Millisecond
}
func (p *ProcessState) String() string {
if p == nil {
return "<nil>"
}
return "exit status: " + p.status.Msg
}
// ExitCode returns the exit code of the exited process, or -1
// if the process hasn't exited or was terminated by a signal.
func (p *ProcessState) ExitCode() int {
// return -1 if the process hasn't started.
if p == nil {
return -1
}
return p.status.ExitStatus()
}
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