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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_SETNONBLOCK 3PCAP "25 July 2018"
+.SH NAME
+pcap_setnonblock, pcap_getnonblock \- set or get the state of
+non-blocking mode on a capture device
+.SH SYNOPSIS
+.nf
+.ft B
+#include <pcap/pcap.h>
+.ft
+.LP
+.nf
+.ft B
+char errbuf[PCAP_ERRBUF_SIZE];
+.ft
+.LP
+.ft B
+int pcap_setnonblock(pcap_t *p, int nonblock, char *errbuf);
+int pcap_getnonblock(pcap_t *p, char *errbuf);
+.ft
+.fi
+.SH DESCRIPTION
+.B pcap_setnonblock()
+puts a capture handle into ``non-blocking'' mode, or takes it out
+of ``non-blocking'' mode, depending on whether the
+.I nonblock
+argument is non-zero or zero.  It has no effect on ``savefiles''.
+If there is an error,
+.B PCAP_ERROR
+is returned and
+.I errbuf
+is filled in with an appropriate error message; otherwise, 0 is
+returned.
+In
+``non-blocking'' mode, an attempt to read from the capture descriptor
+with
+.B pcap_dispatch(3PCAP)
+will, if no packets are currently available to be read, return 0
+immediately rather than blocking waiting for packets to arrive.
+.B pcap_loop(3PCAP)
+and
+.B pcap_next(3PCAP)
+will not work in ``non-blocking'' mode.
+.PP
+When first activated with
+.B pcap_activate(3PCAP)
+or opened with
+.B pcap_open_live(3PCAP) ,
+a capture handle is not in ``non-blocking mode''; a call to
+.B pcap_setnonblock()
+is required in order to put it into ``non-blocking'' mode.
+.SH RETURN VALUE
+.B pcap_getnonblock()
+returns the current ``non-blocking'' state of the capture descriptor; it
+always returns 0 on ``savefiles''.
+If there is an error,
+.B PCAP_ERROR
+is returned and
+.I errbuf
+is filled in with an appropriate error message.
+.PP
+.I errbuf
+is assumed to be able to hold at least
+.B PCAP_ERRBUF_SIZE
+chars.
+.SH SEE ALSO
+pcap(3PCAP), pcap_next_ex(3PCAP), pcap_geterr(3PCAP)