pcap: fix timeout when TPACKET_V3 is used #15
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Starting with libpcap 1.8.0, the TPACKET_V3 interface will be used under Linux. This has the side-effect of packet reads not timing out until a packet is received. This patch detects when TPACKET_V3 is active and uses poll() on the capture file descriptor to ensure packet reads complete within the configured timeout.
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Starting with libpcap 1.8.0, the TPACKET_V3 interface will be used under Linux. This has the side-effect of packet reads not timing out until a packet is received.
This patch detects when TPACKET_V3 is active and uses poll() on the capture file descriptor to ensure packet reads complete within the configured timeout.
Fixes elastic/beats#6535