diff options
Diffstat (limited to 'src/os/pidfd_linux.go')
| -rw-r--r-- | src/os/pidfd_linux.go | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/src/os/pidfd_linux.go b/src/os/pidfd_linux.go index 7a6f4cfad0..5d89c9d39d 100644 --- a/src/os/pidfd_linux.go +++ b/src/os/pidfd_linux.go @@ -66,6 +66,7 @@ func getPidfd(sysAttr *syscall.SysProcAttr, needDup bool) (uintptr, bool) { return uintptr(h), true } +// pidfdFind returns the process handle for pid. func pidfdFind(pid int) (uintptr, error) { if !pidfdWorks() { return 0, syscall.ENOSYS @@ -78,6 +79,8 @@ func pidfdFind(pid int) (uintptr, error) { return h, nil } +// pidfdWait waits for the process to complete, +// and updates the process status to done. func (p *Process) pidfdWait() (*ProcessState, error) { // When pidfd is used, there is no wait/kill race (described in CL 23967) // because the PID recycle issue doesn't exist (IOW, pidfd, unlike PID, @@ -120,6 +123,7 @@ func (p *Process) pidfdWait() (*ProcessState, error) { }, nil } +// pidfdSendSignal sends a signal to the process. func (p *Process) pidfdSendSignal(s syscall.Signal) error { handle, status := p.handleTransientAcquire() switch status { @@ -133,10 +137,12 @@ func (p *Process) pidfdSendSignal(s syscall.Signal) error { return convertESRCH(unix.PidFDSendSignal(handle, s)) } +// pidfdWorks returns whether we can use pidfd on this system. func pidfdWorks() bool { return checkPidfdOnce() == nil } +// checkPidfdOnce is used to only check whether pidfd works once. var checkPidfdOnce = sync.OnceValue(checkPidfd) // checkPidfd checks whether all required pidfd-related syscalls work. This |