const golang.org/x/sys/unix.PID_FS_MAGIC

one use

	golang.org/x/sys/unix (current package)
		zerrors_linux.go#L2466: 	PID_FS_MAGIC                                = 0x50494446

The pages are generated with Golds v0.7.6. (GOOS=linux GOARCH=amd64)