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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)