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.TH PCAP_CAN_SET_RFMON 3PCAP "31 July 2016"

.SH NAME

pcap_can_set_rfmon \- check whether monitor mode can be set for a

not-yet-activated capture handle

.SH SYNOPSIS

.nf

.ft B

#include <pcap/pcap.h>

.LP

.ft B

int pcap_can_set_rfmon(pcap_t *p);

.ft

.fi

.SH DESCRIPTION

.B pcap_can_set_rfmon()

checks whether monitor mode could be set on a capture handle when

the handle is activated.

.SH RETURN VALUE

.B pcap_can_set_rfmon()

returns 0 if monitor mode could not be set,

1 if monitor mode could be set, and a negative value on error.

A negative return value indicates what error condition occurred.

The possible error values are:

.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 check whether monitor mode

could be supported.

.TP

.B PCAP_ERROR_ACTIVATED

The capture handle has already been activated.

.TP

.B PCAP_ERROR

Another error occurred.

.B pcap_geterr(3PCAP)

or

.B \%pcap_perror(3PCAP)

may be called with

.I p

as an argument to fetch or display a message describing the error.

.LP

Additional error codes may be added in the future; a program should

check for 0, 1, and negative, return codes, and treat all negative

return codes as errors.

.B pcap_statustostr(3PCAP)

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), pcap_create(3PCAP), pcap_activate(3PCAP),

pcap_set_rfmon(3PCAP)