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+.\" Copyright (c) 1994, 1996, 1997
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that: (1) source code distributions
+.\" retain the above copyright notice and this paragraph in its entirety, (2)
+.\" distributions including binary code include the above copyright notice and
+.\" this paragraph in its entirety in the documentation or other materials
+.\" provided with the distribution, and (3) all advertising materials mentioning
+.\" features or use of this software display the following acknowledgement:
+.\" ``This product includes software developed by the University of California,
+.\" Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
+.\" the University nor the names of its contributors may be used to endorse
+.\" or promote products derived from this software without specific prior
+.\" written permission.
+.\" THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
+.\" WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
+.\" MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+.\"
+.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)