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
The possible warning values are:
Promiscuous mode was requested, but the capture source doesn't
support promiscuous mode.
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),
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:
The handle has already been activated.
The capture source specified when the handle was created
The process doesn't have permission to open the capture
The process has permission to open the capture source but
doesn't have permission to put it into promiscuous mode.
Monitor mode was specified but the capture source doesn't
support monitor mode.
The capture source device is not up.
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.
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 2017-03-13. 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 email@example.com
7 April 2014 PCAP_ACTIVATE(3PCAP)