bionic (3) pcap_activate.3pcap.gz

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,  a  non-zero  positive  value  on  success  with
       warnings,  and  a  negative  value  on  error.   A  non-zero return value indicates what warning or error
       condition occurred.

       The possible warning values are:

       PCAP_WARNING_PROMISC_NOTSUP
              Promiscuous mode was requested, but the capture source doesn't support promiscuous mode.

       PCAP_WARNING_TSTAMP_TYPE_NOTSUP
              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
              Another  warning  condition  occurred;  pcap_geterr()  or pcap_perror() may be called with p as an
              argument to fetch or display a message describing the warning condition.

       The possible error values are:

       PCAP_ERROR_ACTIVATED
              The handle has already been activated.

       PCAP_ERROR_NO_SUCH_DEVICE
              The capture source specified when the handle was created doesn't exist.

       PCAP_ERROR_PERM_DENIED
              The process doesn't have permission to open the capture source.

       PCAP_ERROR_PROMISC_PERM_DENIED
              The process has permission to open the capture source but doesn't have permission to put  it  into
              promiscuous mode.

       PCAP_ERROR_RFMON_NOTSUP
              Monitor mode was specified but the capture source doesn't support monitor mode.

       PCAP_ERROR_IFACE_NOT_UP
              The capture source device is not up.

       PCAP_ERROR
              Another  error  occurred.   pcap_geterr()  or pcap_perror() may be called with p as an argument to
              fetch or display a message describing the 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.

       Additional warning and error codes may be added in the future;  a  program  should  check  for  positive,
       negative,  and zero return codes, and treat all positive return codes as warnings and all negative return
       codes as errors.  pcap_statustostr() can be called, with a warning or error code as an argument, to fetch
       a message describing the warning or error code.

SEE ALSO

       pcap(3PCAP)

                                                  7 April 2014                              PCAP_ACTIVATE(3PCAP)