Options of getaddrinfo() (2)

• Searching options

  • NULL in nodename denotes loopback or wildcard
    • wildcard if AI_PASSIVE, otherwise loopback
    • numeric address allowed(e.g. “::1”)
  • do not search service if servname is NULL
    • numeric service allowed(e.g. “80”)
  • AF_UNSPEC in ai_family, 0 in ai_socktype, ai_protocol means caller does not care.

Notes: