08-09-2011
The man seems to day you can pull them all offline, but is otherwise terse, so maybe they assume if you want to limp without the bad drive, you just pull it? Maybe the facility you want is lower down, in the system device layer not the md virtual device layer.
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LEARN ABOUT FREEBSD
pcap_datalink
PCAP_DATALINK(3) Library Functions Manual PCAP_DATALINK(3)
NAME
pcap_datalink - get the link-layer header type
SYNOPSIS
#include <pcap/pcap.h>
int pcap_datalink(pcap_t *p);
DESCRIPTION
pcap_datalink() returns the link-layer header type for the live capture or ``savefile'' specified by p.
It must not be called on a pcap descriptor created by pcap_create() that has not yet been activated by pcap_activate().
http://www.tcpdump.org/linktypes.html lists the values pcap_datalink() can return and describes the packet formats that correspond to those
values.
Do NOT assume that the packets for a given capture or ``savefile`` will have any given link-layer header type, such as DLT_EN10MB for Eth-
ernet. For example, the "any" device on Linux will have a link-layer header type of DLT_LINUX_SLL even if all devices on the system at the
time the "any" device is opened have some other data link type, such as DLT_EN10MB for Ethernet.
RETURN VALUE
pcap_datalink() returns the link-layer header type on success and PCAP_ERROR_NOT_ACTIVATED if called on a capture handle that has been cre-
ated but not activated.
SEE ALSO
pcap(3), pcap-linktype(7)
13 October 2013 PCAP_DATALINK(3)