pcap_activate(3) - NetBSD Manual Pages

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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, a non-zero posi-
       tive 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(3) 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(3) or pcap_per-
              ror(3) 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  sup-
              port 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 pro-
       gram 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(3) 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(3)



                                 31 July 2016                 PCAP_ACTIVATE(3)