| fmt | Package fmt implements formatted I/O with functions analogous to C's printf and scanf. |
| github.com/pkg/errors | Package errors provides simple error handling primitives. |
| github.com/rootless-containers/rootlesskit/pkg/port | |
| github.com/rootless-containers/rootlesskit/pkg/port/builtin/msg | |
| github.com/rootless-containers/rootlesskit/pkg/port/builtin/parent/udp/udpproxy | Package udpproxy is from https://raw.githubusercontent.com/docker/libnetwork/fec6476dfa21380bf8ee4d74048515d968c1ee63/cmd/proxy/udp_proxy.go |
| io | Package io provides basic interfaces to I/O primitives. |
| net | Package net provides a portable interface for network I/O, including TCP/IP, UDP, domain name resolution, and Unix domain sockets. |
| os | Package os provides a platform-independent interface to operating system functionality. |