File size: 4,150 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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 | // 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.
//go:build unix || (js && wasm) || wasip1 || windows
package os
import (
"internal/strconv"
"internal/syscall/execenv"
"runtime"
"syscall"
)
// The only signal values guaranteed to be present in the os package on all
// systems are os.Interrupt (send the process an interrupt) and os.Kill (force
// the process to exit). On Windows, sending os.Interrupt to a process with
// os.Process.Signal is not implemented; it will return an error instead of
// sending a signal.
var (
Interrupt Signal = syscall.SIGINT
Kill Signal = syscall.SIGKILL
)
func startProcess(name string, argv []string, attr *ProcAttr) (p *Process, err error) {
// If there is no SysProcAttr (ie. no Chroot or changed
// UID/GID), double-check existence of the directory we want
// to chdir into. We can make the error clearer this way.
if attr != nil && attr.Sys == nil && attr.Dir != "" {
if _, err := Stat(attr.Dir); err != nil {
pe := err.(*PathError)
pe.Op = "chdir"
return nil, pe
}
}
attrSys, shouldDupPidfd := ensurePidfd(attr.Sys)
sysattr := &syscall.ProcAttr{
Dir: attr.Dir,
Env: attr.Env,
Sys: attrSys,
}
if sysattr.Env == nil {
sysattr.Env, err = execenv.Default(sysattr.Sys)
if err != nil {
return nil, err
}
}
sysattr.Files = make([]uintptr, 0, len(attr.Files))
for _, f := range attr.Files {
sysattr.Files = append(sysattr.Files, f.Fd())
}
pid, h, e := syscall.StartProcess(name, argv, sysattr)
// Make sure we don't run the finalizers of attr.Files.
runtime.KeepAlive(attr)
if e != nil {
return nil, &PathError{Op: "fork/exec", Path: name, Err: e}
}
// For Windows, syscall.StartProcess above already returned a process handle.
if runtime.GOOS != "windows" {
var ok bool
h, ok = getPidfd(sysattr.Sys, shouldDupPidfd)
if !ok {
return newPIDProcess(pid), nil
}
}
return newHandleProcess(pid, h), nil
}
func (p *Process) kill() error {
return p.Signal(Kill)
}
func (p *Process) withHandle(f func(handle uintptr)) error {
if p.handle == nil {
return ErrNoHandle
}
handle, status := p.handleTransientAcquire()
switch status {
case statusDone:
return ErrProcessDone
case statusReleased:
return errProcessReleased
}
defer p.handleTransientRelease()
f(handle)
return nil
}
// ProcessState stores information about a process, as reported by Wait.
type ProcessState struct {
pid int // The process's id.
status syscall.WaitStatus // System-dependent status info.
rusage *syscall.Rusage
}
// 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.rusage
}
func (p *ProcessState) String() string {
if p == nil {
return "<nil>"
}
status := p.Sys().(syscall.WaitStatus)
res := ""
switch {
case status.Exited():
code := status.ExitStatus()
if runtime.GOOS == "windows" && uint(code) >= 1<<16 { // windows uses large hex numbers
res = "exit status 0x" + strconv.FormatUint(uint64(code), 16)
} else { // unix systems use small decimal integers
res = "exit status " + strconv.Itoa(code) // unix
}
case status.Signaled():
res = "signal: " + status.Signal().String()
case status.Stopped():
res = "stop signal: " + status.StopSignal().String()
if status.StopSignal() == syscall.SIGTRAP && status.TrapCause() != 0 {
res += " (trap " + strconv.Itoa(status.TrapCause()) + ")"
}
case status.Continued():
res = "continued"
}
if status.CoreDump() {
res += " (core dumped)"
}
return res
}
// 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()
}
|