d56f51ea7d
As part of this, we import bpf_filter.c from NetBSD. Even though that file is part of the NetBSD kernel, it is also used by userland (as is clear here). Our LWIP service has its own bpf_filter.c implementation but that implementation has certain limits (e.g. on program size) that are fine for a system service but should not apply to userland. The libpcap code has a number of blocks guarded by __NetBSD__, but none of those blocks apply to MINIX 3. In particular, some of the alignment logic used for NetBSD may in fact not work in our case. Change-Id: Ib187e22d627c929e111d5d4a991c3bee3c0154cb
90 lines
2.6 KiB
Plaintext
90 lines
2.6 KiB
Plaintext
.\" $NetBSD: pcap_open_live.3pcap,v 1.2 2014/11/19 19:33:30 christos Exp $
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.\"
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.\" Copyright (c) 1994, 1996, 1997
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that: (1) source code distributions
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.\" retain the above copyright notice and this paragraph in its entirety, (2)
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.\" distributions including binary code include the above copyright notice and
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.\" this paragraph in its entirety in the documentation or other materials
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.\" provided with the distribution, and (3) all advertising materials mentioning
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.\" features or use of this software display the following acknowledgement:
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.\" ``This product includes software developed by the University of California,
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.\" Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
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.\" the University nor the names of its contributors may be used to endorse
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.\" or promote products derived from this software without specific prior
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.\" written permission.
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.\" THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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.\" WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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.\" MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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.\"
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.TH PCAP_OPEN_LIVE 3PCAP "5 April 2008"
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.SH NAME
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pcap_open_live \- open a device for capturing
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.SH SYNOPSIS
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.nf
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.ft B
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#include <pcap/pcap.h>
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.ft
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.LP
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.nf
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.ft B
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char errbuf[PCAP_ERRBUF_SIZE];
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.ft
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.LP
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.ft B
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pcap_t *pcap_open_live(const char *device, int snaplen,
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.ti +8
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int promisc, int to_ms, char *errbuf);
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.ft
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.fi
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.SH DESCRIPTION
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.B pcap_open_live()
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is used to obtain a packet capture handle to look
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at packets on the network.
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.I device
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is a string that specifies the network device to open; on Linux systems
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with 2.2 or later kernels, a
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.I device
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argument of "any" or
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.B NULL
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can be used to capture packets from all interfaces.
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.PP
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.I snaplen
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specifies the snapshot length to be set on the handle.
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.PP
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.I promisc
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specifies if the interface is to be put into promiscuous mode.
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.PP
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.I to_ms
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specifies the read timeout in milliseconds.
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.SH RETURN VALUE
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.B pcap_open_live()
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returns a
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.I pcap_t *
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on success and
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.B NULL
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on failure.
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If
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.B NULL
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is returned,
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.I errbuf
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is filled in with an appropriate error message.
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.I errbuf
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may also be set to warning text when
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.B pcap_open_live()
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succeeds; to detect this case the caller should store a zero-length string in
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.I errbuf
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before calling
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.B pcap_open_live()
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and display the warning to the user if
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.I errbuf
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is no longer a zero-length string.
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.I errbuf
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is assumed to be able to hold at least
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.B PCAP_ERRBUF_SIZE
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chars.
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.SH SEE ALSO
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pcap(3PCAP), pcap_create(3PCAP), pcap_activate(3PCAP)
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