Source to net/bpf_compat.h
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* @(#)bpf_compat.h 8.1 (Berkeley) 6/10/93
/* from: $Header: bpf_compat.h,v 1.1 92/05/22 15:33:20 mccanne Exp $ (LBL) */
* Some hacks for compatibility across SunOS and 4.4BSD. We emulate malloc
* and free with mbuf clusters. We store a pointer to the mbuf in the first
* word of the mbuf and return 8 bytes passed the start of data (for double
* word alignment). We cannot just use offsets because clusters are not at
* a fixed offset from the associated mbuf. Sorry for this kludge.
#define malloc(size, type, canwait) bpf_alloc(size, canwait)
#define free(cp, type) m_free(*(struct mbuf **)(cp - 8))
#define M_WAITOK M_WAIT
/* This mapping works for our purposes. */
#define ERESTART EINTR