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by Kimmo Suominen.
Based on man-cgi by Panagiotis Christias.
pcap_activate - activate a capture handle
int pcap_activate(pcap_t *p);
pcap_activate() is used to activate a packet capture handle to look at
packets on the network, with the options that were set on the handle
being in effect.
pcap_activate() returns 0 on success without warnings, PCAP_WARN-
ING_PROMISC_NOTSUP on success on a device that doesn't support promis-
cuous mode if promiscuous mode was requested, PCAP_WARN-
ING_TSTAMP_TYPE_NOTSUP on success if the time stamp type specified in a
previous pcap_set_tstamp_type() call isn't supported by the capture
source (the time stamp type is left as the default), PCAP_WARNING on
success with any other warning, PCAP_ERROR_ACTIVATED if the handle has
already been activated, PCAP_ERROR_NO_SUCH_DEVICE if the capture source
specified when the handle was created doesn't exist,
PCAP_ERROR_PERM_DENIED if the process doesn't have permission to open
the capture source, PCAP_ERROR_PROMISC_PERM_DENIED if the process has
permission to open the capture source but doesn't have permission to
put it into promiscuous mode, PCAP_ERROR_RFMON_NOTSUP if monitor mode
was specified but the capture source doesn't support monitor mode,
PCAP_ERROR_IFACE_NOT_UP if the capture source is not up, and PCAP_ERROR
if another error occurred. If PCAP_WARNING or PCAP_ERROR is returned,
pcap_geterr() or pcap_perror() may be called with p as an argument to
fetch or display a message describing the warning or error. If
PCAP_WARNING_PROMISC_NOTSUP, PCAP_ERROR_NO_SUCH_DEVICE, or
PCAP_ERROR_PERM_DENIED is returned, pcap_geterr() or pcap_perror() may
be called with p as an argument to fetch or display an message giving
additional details about the problem that might be useful for debugging
the problem if it's unexpected.
5 April 2008 PCAP_ACTIVATE(3)