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ip_pktinfo 

        # Socket::AncillaryData.ip_pktinfo

(from ruby core)
### Implementation from AncillaryData
---
    Socket::AncillaryData.ip_pktinfo(addr, ifindex) => ancdata
    Socket::AncillaryData.ip_pktinfo(addr, ifindex, spec_dst) => ancdata

---

Returns new ancillary data for IP_PKTINFO.

If spec_dst is not given, addr is used.

IP_PKTINFO is not standard.

Supported platform: GNU/Linux

    addr = Addrinfo.ip("127.0.0.1")
    ifindex = 0
    spec_dst = Addrinfo.ip("127.0.0.1")
    p Socket::AncillaryData.ip_pktinfo(addr, ifindex, spec_dst)
    #=> #<Socket::AncillaryData: INET IP PKTINFO 127.0.0.1 ifindex:0 spec_dst:127.0.0.1>


(from ruby core)
### Implementation from AncillaryData
---
    ancdata.ip_pktinfo => [addr, ifindex, spec_dst]

---

Extracts addr, ifindex and spec_dst from IP_PKTINFO ancillary data.

IP_PKTINFO is not standard.

Supported platform: GNU/Linux

    addr = Addrinfo.ip("127.0.0.1")
    ifindex = 0
    spec_dest = Addrinfo.ip("127.0.0.1")
    ancdata = Socket::AncillaryData.ip_pktinfo(addr, ifindex, spec_dest)
    p ancdata.ip_pktinfo
    #=> [#<Addrinfo: 127.0.0.1>, 0, #<Addrinfo: 127.0.0.1>]

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