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
74 lines
2.5 KiB
Plaintext
74 lines
2.5 KiB
Plaintext
.\" 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_LIST_DATALINKS 3PCAP "17 September 2013"
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.SH NAME
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pcap_list_datalinks, pcap_free_datalinks \- get a list of link-layer header
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types supported by a capture device, and free that list
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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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.ft B
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int pcap_list_datalinks(pcap_t *p, int **dlt_buf);
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void pcap_free_datalinks(int *dlt_list);
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.ft
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.fi
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.SH DESCRIPTION
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.B pcap_list_datalinks()
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is used to get a list of the supported link-layer header types of the
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interface associated with the pcap descriptor.
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.B pcap_list_datalinks()
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allocates an array to hold the list and sets
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.IR *dlt_buf
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to point to that array.
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.LP
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The caller is responsible for freeing the array with
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.BR pcap_free_datalinks() ,
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which frees the list of link-layer header types pointed to by
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.IR dlt_list .
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.LP
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It must not be called on a pcap descriptor created by
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.B pcap_create()
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that has not yet been activated by
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.BR pcap_activate() .
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.SH RETURN VALUE
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.B pcap_list_datalinks()
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returns the number of link-layer header types in the array on success,
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.B PCAP_ERROR_NOT_ACTIVATED
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if called on a capture handle that has been created but not activated,
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and
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.B PCAP_ERROR
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(\-1) on other errors.
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If
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.B PCAP_ERROR
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is returned,
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.B pcap_geterr()
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or
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.B pcap_perror()
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may be called with
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.I p
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as an argument to fetch or display the error text.
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.SH SEE ALSO
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pcap(3PCAP), pcap_geterr(3PCAP),
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pcap_datalink_val_to_name(3PCAP),
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pcap-linktype(@MAN_MISC_INFO@)
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