Function ProcThreadSelfOpen

internal/pathrs/procfs_pathrslite.go:74–101

ProcThreadSelfOpen is a wrapper around [procfs.Handle.OpenThreadSelf] and [pathrs.Reopen], to let you one-shot open a procfs file with the given flags. The returned [procfs.ProcThreadSelfCloser] needs the same handling as when using pathrs-lite.

(subpath string, flags int)

// flags. The returned [procfs.ProcThreadSelfCloser] needs the same handling as
// when using pathrs-lite.
func ProcThreadSelfOpen(subpath string, flags int) (_ *os.File, _ procfs.ProcThreadSelfCloser, Err error) {
	proc, err := retryEAGAIN(procfs.OpenProcRoot)
	if err != nil {
		return nil, nil, err
	}
	defer proc.Close()

	handle, closer, err := retryEAGAIN2(func() (*os.File, procfs.ProcThreadSelfCloser, error) {
		return proc.OpenThreadSelf(subpath)
	})
	if err != nil {
		return nil, nil, err
	}
	if closer != nil {
		defer func() {
			if Err != nil {
				closer()
			}
		}()
	}
	defer handle.Close()

	f, err := Reopen(handle, flags)
	if err != nil {
		return nil, nil, fmt.Errorf("reopen %s: %w", handle.Name(), err)
	}
	return f, closer, nil
}

// Reopen is a wrapper around pathrs.Reopen.
func Reopen(file *os.File, flags int) (*os.File, error) {