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root/cebix/BasiliskII/src/slirp/mbuf.h
Revision: 1.2
Committed: 2012-03-30T01:10:28Z (12 years, 7 months ago) by asvitkine
Content type: text/plain
Branch: MAIN
CVS Tags: HEAD
Changes since 1.1: +1 -5 lines
Log Message: 
Switch slirp to 3-clause BSD license. This change went in upstream to QEMU's
version of slirp (where this code comes from), with the following checkin:

commit 2f5f89963186d42a7ded253bc6cf5b32abb45cec
Author: aliguori <aliguori@c046a42c-6fe2-441c-8c8c-71466251a162>
Date:   Mon Jan 26 19:37:41 2009 +0000

    Remove the advertising clause from the slirp license

    According to the FSF, the 4-clause BSD license, which slirp is covered under,
    is not compatible with the GPL or LGPL[1].

    [1] http://www.fsf.org/licensing/licenses/index_html#GPLIncompatibleLicenses

    There are three declared copyright holders in slirp that use the 4-clause
    BSD license, the Regents of UC Berkley, Danny Gasparovski, and Kelly Price.
    Below are the appropriate permissions to remove the advertise clause from slirp
    from each party.

    Special thanks go to Richard Fontana from Red Hat for contacting all of the
    necessary authors to resolve this issue!

    Regents of UC Berkley:
    From ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change

    July 22, 1999

    To All Licensees, Distributors of Any Version of BSD:

    As you know, certain of the Berkeley Software Distribution ("BSD") source
    code files require that further distributions of products containing all or
    portions of the software, acknowledge within their advertising materials
    that such products contain software developed by UC Berkeley and its
    contributors.

    Specifically, the provision reads:

    "     * 3. All advertising materials mentioning features or use of this software
          *    must display the following acknowledgement:
          *    This product includes software developed by the University of
          *    California, Berkeley and its contributors."

    Effective immediately, licensees and distributors are no longer required to
    include the acknowledgement within advertising materials.  Accordingly, the
    foregoing paragraph of those BSD Unix files containing it is hereby deleted
    in its entirety.

    William Hoskins
    Director, Office of Technology Licensing
    University of California, Berkeley

    Danny Gasparovski:

    Subject: RE: Slirp license
    Date: Thu, 8 Jan 2009 10:51:00 +1100
    From: "Gasparovski, Daniel" <Daniel.Gasparovski@ato.gov.au>
    To: "Richard Fontana" <rfontana@redhat.com>

    Hi Richard,

    I have no objection to having Slirp code in QEMU be licensed under the
    3-clause BSD license.

    Thanks for taking the effort to consult me about this.


    Dan ...

    Kelly Price:

    Date: Thu, 8 Jan 2009 19:38:56 -0500
    From: "Kelly Price" <strredwolf@gmail.com>
    To: "Richard Fontana" <rfontana@redhat.com>
    Subject: Re: Slirp license

    Thanks for contacting me, Richard.  I'm glad you were able to find
    Dan, as I've been "keeping the light on" for Slirp.  I have no use for
    it now, and I have little time for it (now holding onto Keenspot's
    Comic Genesis and having a regular US state government position). If
    Dan would like to return to the project, I'd love to give it back to
    him.

    As for copyright, I don't own all of it.  Dan does, so I will defer to
    him.  Any of my patches I will gladly license to the 3-part BSD
    license.  My interest in re-licensing was because we didn't have ready
    info to contact Dan.  If Dan would like to port Slirp back out of
    QEMU, a lot of us 64-bit users would be grateful.

    Feel free to share this email address with Dan.  I will be glad to
    effect a transfer of the project to him and Mr. Bellard of the QEMU
    project.

    Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>


    git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6451 c046a42c-6fe2-441c-8c8c-71466251a162

File Contents

# Content
1 /*
2 * Copyright (c) 1982, 1986, 1988, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * @(#)mbuf.h 8.3 (Berkeley) 1/21/94
30 * mbuf.h,v 1.9 1994/11/14 13:54:20 bde Exp
31 */
32
33 #ifndef _MBUF_H_
34 #define _MBUF_H_
35
36 #define m_freem m_free
37
38
39 #define MINCSIZE 4096 /* Amount to increase mbuf if too small */
40
41 /*
42 * Macros for type conversion
43 * mtod(m,t) - convert mbuf pointer to data pointer of correct type
44 * dtom(x) - convert data pointer within mbuf to mbuf pointer (XXX)
45 */
46 #define mtod(m,t) ((t)(m)->m_data)
47 /* #define dtom(x) ((struct mbuf *)((int)(x) & ~(M_SIZE-1))) */
48
49 /* XXX About mbufs for slirp:
50 * Only one mbuf is ever used in a chain, for each "cell" of data.
51 * m_nextpkt points to the next packet, if fragmented.
52 * If the data is too large, the M_EXT is used, and a larger block
53 * is alloced. Therefore, m_free[m] must check for M_EXT and if set
54 * free the m_ext. This is inefficient memory-wise, but who cares.
55 */
56
57 /* XXX should union some of these! */
58 /* header at beginning of each mbuf: */
59 struct m_hdr {
60 struct mbuf *mh_next; /* Linked list of mbufs */
61 struct mbuf *mh_prev;
62 struct mbuf *mh_nextpkt; /* Next packet in queue/record */
63 struct mbuf *mh_prevpkt; /* Flags aren't used in the output queue */
64 int mh_flags; /* Misc flags */
65
66 int mh_size; /* Size of data */
67 struct socket *mh_so;
68
69 caddr_t mh_data; /* Location of data */
70 int mh_len; /* Amount of data in this mbuf */
71 };
72
73 /*
74 * How much room is in the mbuf, from m_data to the end of the mbuf
75 */
76 #define M_ROOM(m) ((m->m_flags & M_EXT)? \
77 (((m)->m_ext + (m)->m_size) - (m)->m_data) \
78 : \
79 (((m)->m_dat + (m)->m_size) - (m)->m_data))
80
81 /*
82 * How much free room there is
83 */
84 #define M_FREEROOM(m) (M_ROOM(m) - (m)->m_len)
85 #define M_TRAILINGSPACE M_FREEROOM
86
87 struct mbuf {
88 struct m_hdr m_hdr;
89 union M_dat {
90 char m_dat_[1]; /* ANSI don't like 0 sized arrays */
91 char *m_ext_;
92 } M_dat;
93 };
94
95 #define m_next m_hdr.mh_next
96 #define m_prev m_hdr.mh_prev
97 #define m_nextpkt m_hdr.mh_nextpkt
98 #define m_prevpkt m_hdr.mh_prevpkt
99 #define m_flags m_hdr.mh_flags
100 #define m_len m_hdr.mh_len
101 #define m_data m_hdr.mh_data
102 #define m_size m_hdr.mh_size
103 #define m_dat M_dat.m_dat_
104 #define m_ext M_dat.m_ext_
105 #define m_so m_hdr.mh_so
106
107 #define ifq_prev m_prev
108 #define ifq_next m_next
109 #define ifs_prev m_prevpkt
110 #define ifs_next m_nextpkt
111 #define ifq_so m_so
112
113 #define M_EXT 0x01 /* m_ext points to more (malloced) data */
114 #define M_FREELIST 0x02 /* mbuf is on free list */
115 #define M_USEDLIST 0x04 /* XXX mbuf is on used list (for dtom()) */
116 #define M_DOFREE 0x08 /* when m_free is called on the mbuf, free()
117 * it rather than putting it on the free list */
118
119 /*
120 * Mbuf statistics. XXX
121 */
122
123 struct mbstat {
124 int mbs_alloced; /* Number of mbufs allocated */
125
126 };
127
128 extern struct mbstat mbstat;
129 extern int mbuf_alloced;
130 extern struct mbuf m_freelist, m_usedlist;
131 extern int mbuf_max;
132
133 void m_init _P((void));
134 void msize_init _P((void));
135 struct mbuf * m_get _P((void));
136 void m_free _P((struct mbuf *));
137 void m_cat _P((register struct mbuf *, register struct mbuf *));
138 void m_inc _P((struct mbuf *, int));
139 void m_adj _P((struct mbuf *, int));
140 int m_copy _P((struct mbuf *, struct mbuf *, int, int));
141 struct mbuf * dtom _P((void *));
142
143 #endif