pcap_activate man page on FreeBSD

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PCAP_ACTIVATE(3)					      PCAP_ACTIVATE(3)

NAME
       pcap_activate - activate a capture handle

SYNOPSIS
       #include <pcap/pcap.h>

       int pcap_activate(pcap_t *p);

DESCRIPTION
       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.

RETURN VALUE
       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_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 speci‐
       fied 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_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.

SEE ALSO
       pcap(3)

				 5 April 2008		      PCAP_ACTIVATE(3)
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