NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | SEE ALSO | COLOPHON

PCAP_ACTIVATE(3PCAP)                                    PCAP_ACTIVATE(3PCAP)

NAME         top

       pcap_activate - activate a capture handle

SYNOPSIS         top

       #include <pcap/pcap.h>

       int pcap_activate(pcap_t *p);

DESCRIPTION         top

       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         top

       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         top

       pcap(3PCAP)

COLOPHON         top

       This page is part of the libpcap (packet capture library) project.
       Information about the project can be found at 
       ⟨http://www.tcpdump.org/⟩.  If you have a bug report for this manual
       page, see ⟨http://www.tcpdump.org/#patches⟩.  This page was obtained
       from the project's upstream Git repository 
       ⟨https://github.com/the-tcpdump-group/libpcap.git⟩ on 2017-05-03.  If
       you discover any rendering problems in this HTML version of the page,
       or you believe there is a better or more up-to-date source for the
       page, or you have corrections or improvements to the information in
       this COLOPHON (which is not part of the original manual page), send a
       mail to man-pages@man7.org

                                7 April 2014            PCAP_ACTIVATE(3PCAP)