go/src/os/pidfd_linux.go

// ensurePidfd initializes the PidFD field in sysAttr if it is not already set.
// It returns the original or modified SysProcAttr struct and a flag indicating
// whether the PidFD should be duplicated before using.
func ensurePidfd(sysAttr *syscall.SysProcAttr) (*syscall.SysProcAttr, bool) { … }

// getPidfd returns the value of sysAttr.PidFD (or its duplicate if needDup is
// set) and a flag indicating whether the value can be used.
func getPidfd(sysAttr *syscall.SysProcAttr, needDup bool) (uintptr, bool) { … }

func pidfdFind(pid int) (uintptr, error) { … }

const _P_PIDFD …

func (p *Process) pidfdWait() (*ProcessState, error) { … }

func (p *Process) pidfdSendSignal(s syscall.Signal) error { … }

func pidfdWorks() bool { … }

var checkPidfdOnce …

// checkPidfd checks whether all required pidfd-related syscalls work. This
// consists of pidfd_open and pidfd_send_signal syscalls, waitid syscall with
// idtype of P_PIDFD, and clone(CLONE_PIDFD).
//
// Reasons for non-working pidfd syscalls include an older kernel and an
// execution environment in which the above system calls are restricted by
// seccomp or a similar technology.
func checkPidfd() error { … }

// Provided by syscall.
//
//go:linkname checkClonePidfd
func checkClonePidfd() error

// Provided by runtime.
//
//go:linkname ignoreSIGSYS
func ignoreSIGSYS()

//go:linkname restoreSIGSYS
func restoreSIGSYS()