| EAI_AGAIN | temporary failure in name resolution |
| EAI_BADFLAGS | invalid value for ai_flags |
| EAI_BADHINTS | invalid value for hints |
| EAI_FAIL | non-recoverable failure in name resolution |
| EAI_FAMILY | ai_family not supported |
| EAI_MEMORY | memory allocation failure |
| EAI_NONAME | hostname or servname not provided, or not known |
| EAI_PROTOCOL | resolved protocol is unknown |
| EAI_SERVICE | servname not supported for ai_socktype |
| EAI_SOCKTYPE | ai_socktype not supported |
| EAI_SYSTEM | system error returned in errno |
|
