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Length: 3941 (0xf65)
Types: TextFile
Notes: UNIX file
Names: »mbuf.h«
└─⟦8c4f54e61⟧ Bits:30004068/disk2.imd Interactive TCP/IP v.1.2
└─⟦8c4f54e61⟧ UNIX Filesystem
└─⟦this⟧ »hb/new/usr/include/sys/mbuf.h«
/*
* Copyright (c) 1982, 1986 Regents of the University of California.
* All rights reserved. The Berkeley software License Agreement
* specifies the terms and conditions for redistribution.
*
* @(#)mbuf.h 7.1 (Berkeley) 6/4/86
*/
#ident "@(#)mbuf.h 1.2 - 89/02/24"
/*
* Constants related to memory allocator.
*/
#define MSIZE 128 /* size of an mbuf */
#define MMINOFF 0 /* mbuf header length */
#define MTAIL 4
#define MMAXOFF (MSIZE-MTAIL) /* offset where data ends */
#define MLEN (MSIZE-MMINOFF-MTAIL) /* mbuf data length */
#define NMBCLUSTERS 256
#define NMBPCL (CLBYTES/MSIZE) /* # mbufs per cluster */
/*
* Macros for type conversion
*/
/* address in mbuf to mbuf head */
#define dtom(x) $_dtom x$
/* mbuf head, to typed data */
#define mtod(x,t) ((t)((x)->b_rptr))
/* macro to get length of this buffer */
#define m_len(m) ((m)->b_wptr - (m)->b_rptr)
/* macro to compute space between b_rptr and beginning of buffer */
/* used for m_off value */
#define m_off(m) ((m)->b_rptr - (m)->b_datap->db_base)
/* get base of buffer for reset of b_rptr */
#define m_base(m) (m)->b_datap->db_base
/* maximum amount of data (MAXOFF) in this buffer */
#define m_maxoff(m) ((m)->b_datap->db_lim - (m)->b_datap->db_base)
/* mbuf types */
#define MT_FREE 0 /* should be on free list */
#define MT_DATA 1 /* dynamic (data) allocation */
#define MT_HEADER 2 /* packet header */
#define MT_SOCKET 3 /* socket structure */
#define MT_PCB 4 /* protocol control block */
#define MT_RTABLE 5 /* routing tables */
#define MT_HTABLE 6 /* IMP host tables */
#define MT_ATABLE 7 /* address resolution tables */
#define MT_SONAME 8 /* socket name */
#define MT_ZOMBIE 9 /* zombie proc status */
#define MT_SOOPTS 10 /* socket options */
#define MT_FTABLE 11 /* fragment reassembly header */
#define MT_RIGHTS 12 /* access rights */
#define MT_IFADDR 13 /* interface address */
/* flags to m_get */
#define M_DONTWAIT 0
#define M_WAIT 1
/* flags to m_pgalloc */
/* #define MPG_MBUFS 0 /* put new mbufs on free list */
/* #define MPG_CLUSTERS 1 /* put new clusters on free list */
/* #define MPG_SPACE 2 /* don't free; caller wants space */
/* length to m_copy to copy all */
#define M_COPYALL 1000000000
/*
* m_pullup will pull up additional length if convenient;
* should be enough to hold headers of second-level and higher protocols.
*/
#define MPULL_EXTRA 32
#define MGET(m, i, t) (m = allocb(MSIZE, BPRI_MED))
/*
* Mbuf page cluster macros.
* MCLALLOC allocates mbuf page clusters.
* Note that it works only with a count of 1 at the moment.
* MCLGET adds such clusters to a normal mbuf.
* m->m_len is set to CLBYTES upon success.
* MCLFREE frees clusters allocated by MCLALLOC.
*/
#define CLBYTES 1024
#define MCLBYTES CLBYTES
#define MCLALLOC(m, i) (m = allocb(CLBYTES, BPRI_MED))
/* #define M_HASCL(m) ((m)->m_off >= MSIZE) */
/* #define MTOCL(m) ((struct mbuf *)(mtod((m), int)&~CLOFSET)) */
#define MCLGET(m) MCLALLOC(m, M_DONTWAIT, MT_DATA)
#define MCLFREE(m) $MCLFREE m$
#define MFREE(m, n) {n = m->b_cont; freeb(m);}
/*
* additional macros to map functions as needed
*/
#define m_freem(m) freemsg(m) /* 1-1 mapping */
#define m_free(m) freeb(m)
#define m_adj(m,diff) (adjmsg(m, diff)==1 ||panic("m_adj")) /* adjmsg can fail, m_adj doesn't ??? */
#define m_cat(m1, m2) linkb(m1, m2) /* m_cat does compaction, linkb does not */
/* equivalent. VAX converts ovbcopy into inline code */
#define ovbcopy bcopy
/*
* Mbuf statistics.
*/
/* struct mbstat {
/* short m_mbufs; /* mbufs obtained from page pool */
/* short m_clusters; /* clusters obtained from page pool */
/* short m_clfree; /* free clusters */
/* short m_drops; /* times failed to find space */
/* short m_mtypes[256]; /* type specific mbuf allocations */
/* }; */
#ifdef KERNEL
/* need to map this to a valid function */
#define splnet splstr
mblk_t *m_get(), *m_getclr(), *m_copy(), *m_pullup();
#endif