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On new architectures and on the alpha, define SIZEOF_BPF_HDR to be 

sizeof(struct bpf_hdr).  On machines that we currently support that
can use the old definition (which just covers the size of the data in
struct bpf_hdr), use it even though it's a hack.  (This was changed
for the 'new architectures' case so as to be fail-safe; BPF may
waste a few bytes of space per captured packet on new architectures,
but now at least it's more likely to work.)
This commit is contained in:
cgd 1996-05-02 00:57:28 +00:00
parent 8fcff43077
commit 4d6b6d9082
1 changed files with 10 additions and 1 deletions
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11
sys/net/bpf.h
View File

@ -1,4 +1,4 @@
/* $NetBSD: bpf.h,v 1.13 1996/02/13 21:59:58 christos Exp $ */
/* $NetBSD: bpf.h,v 1.14 1996/05/02 00:57:28 cgd Exp $ */
/*
* Copyright (c) 1990, 1991, 1993
@ -144,9 +144,18 @@ struct bpf_hdr {
* Because the structure above is not a multiple of 4 bytes, some compilers
* will insist on inserting padding; hence, sizeof(struct bpf_hdr) won't work.
* Only the kernel needs to know about it; applications use bh_hdrlen.
* XXX To save a few bytes on 32-bit machines, we avoid end-of-struct
* XXX padding by using the size of the header data elements. This is
* XXX fail-safe: on new machines, we just use the 'safe' sizeof.
*/
#ifdef _KERNEL
#if defined(__arm32__) || defined(__i386__) || defined(__m68k__) || \
defined(__mips__) || defined(__ns32k__) || defined(__sparc__) || \
defined(__vax__)
#define SIZEOF_BPF_HDR 18
#else
#define SIZEOF_BPF_HDR sizeof(struct bpf_hdr)
#endif
#endif
/*