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| .TH PCAP_ACTIVATE 3PCAP "7 April 2014" |
| .SH NAME |
| pcap_activate \- activate a capture handle |
| .SH SYNOPSIS |
| .nf |
| .ft B |
| #include <pcap/pcap.h> |
| .ft |
| .LP |
| .ft B |
| int pcap_activate(pcap_t *p); |
| .ft |
| .fi |
| .SH DESCRIPTION |
| .B 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. |
| .SH RETURN VALUE |
| .B 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. |
| .LP |
| The possible warning values are: |
| .TP |
| .B PCAP_WARNING_PROMISC_NOTSUP |
| Promiscuous mode was requested, but the capture source doesn't support |
| promiscuous mode. |
| .TP |
| .B PCAP_WARNING_TSTAMP_TYPE_NOTSUP |
| The time stamp type specified in a previous |
| .B pcap_set_tstamp_type() |
| call isn't supported by the capture source (the time stamp type is |
| left as the default), |
| .TP |
| .B PCAP_WARNING |
| Another warning condition occurred; |
| .B pcap_geterr() |
| or |
| .B pcap_perror() |
| may be called with |
| .I p |
| as an argument to fetch or display a message describing the warning |
| condition. |
| .LP |
| The possible error values are: |
| .TP |
| .B PCAP_ERROR_ACTIVATED |
| The handle has already been activated. |
| .TP |
| .B PCAP_ERROR_NO_SUCH_DEVICE |
| The capture source specified when the handle was created doesn't |
| exist. |
| .TP |
| .B PCAP_ERROR_PERM_DENIED |
| The process doesn't have permission to open the capture source. |
| .TP |
| .B 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. |
| .TP |
| .B PCAP_ERROR_RFMON_NOTSUP |
| Monitor mode was specified but the capture source doesn't support |
| monitor mode. |
| .TP |
| .B PCAP_ERROR_IFACE_NOT_UP |
| The capture source device is not up. |
| .TP |
| .B PCAP_ERROR |
| Another error occurred. |
| .B pcap_geterr() |
| or |
| .B pcap_perror() |
| may be called with |
| .I p |
| as an argument to fetch or display a message describing the error. |
| .LP |
| If |
| .BR PCAP_WARNING_PROMISC_NOTSUP , |
| .BR PCAP_ERROR_NO_SUCH_DEVICE , |
| or |
| .B PCAP_ERROR_PERM_DENIED |
| is returned, |
| .B pcap_geterr() |
| or |
| .B pcap_perror() |
| may be called with |
| .I 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. |
| .LP |
| 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. |
| .B pcap_statustostr() |
| can be called, with a warning or error code as an argument, to fetch a |
| message describing the warning or error code. |
| .SH SEE ALSO |
| pcap(3PCAP) |