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

one use

	golang.org/x/sys/unix (current package)
		zerrors_linux_amd64.go#L370: 	SO_PEERPIDFD                     = 0x4d

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