105 lines
2.1 KiB
Go
105 lines
2.1 KiB
Go
//go:build linux
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// +build linux
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package system
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import (
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"os"
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"os/exec"
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"unsafe"
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"golang.org/x/sys/unix"
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)
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type ParentDeathSignal int
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func (p ParentDeathSignal) Restore() error {
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if p == 0 {
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return nil
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}
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current, err := GetParentDeathSignal()
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if err != nil {
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return err
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}
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if p == current {
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return nil
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}
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return p.Set()
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}
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func (p ParentDeathSignal) Set() error {
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return SetParentDeathSignal(uintptr(p))
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}
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// Deprecated: Execv is not used in runc anymore, it will be removed in v1.2.0.
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func Execv(cmd string, args []string, env []string) error {
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name, err := exec.LookPath(cmd)
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if err != nil {
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return err
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}
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return Exec(name, args, env)
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}
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func Exec(cmd string, args []string, env []string) error {
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for {
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err := unix.Exec(cmd, args, env)
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if err != unix.EINTR { //nolint:errorlint // unix errors are bare
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return &os.PathError{Op: "exec", Path: cmd, Err: err}
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}
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}
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}
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func SetParentDeathSignal(sig uintptr) error {
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if err := unix.Prctl(unix.PR_SET_PDEATHSIG, sig, 0, 0, 0); err != nil {
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return err
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}
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return nil
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}
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func GetParentDeathSignal() (ParentDeathSignal, error) {
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var sig int
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if err := unix.Prctl(unix.PR_GET_PDEATHSIG, uintptr(unsafe.Pointer(&sig)), 0, 0, 0); err != nil {
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return -1, err
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}
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return ParentDeathSignal(sig), nil
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}
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func SetKeepCaps() error {
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if err := unix.Prctl(unix.PR_SET_KEEPCAPS, 1, 0, 0, 0); err != nil {
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return err
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}
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return nil
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}
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func ClearKeepCaps() error {
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if err := unix.Prctl(unix.PR_SET_KEEPCAPS, 0, 0, 0, 0); err != nil {
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return err
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}
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return nil
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}
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func Setctty() error {
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if err := unix.IoctlSetInt(0, unix.TIOCSCTTY, 0); err != nil {
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return err
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}
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return nil
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}
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// SetSubreaper sets the value i as the subreaper setting for the calling process
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func SetSubreaper(i int) error {
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return unix.Prctl(unix.PR_SET_CHILD_SUBREAPER, uintptr(i), 0, 0, 0)
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}
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// GetSubreaper returns the subreaper setting for the calling process
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func GetSubreaper() (int, error) {
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var i uintptr
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if err := unix.Prctl(unix.PR_GET_CHILD_SUBREAPER, uintptr(unsafe.Pointer(&i)), 0, 0, 0); err != nil {
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return -1, err
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}
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return int(i), nil
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}
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