119 lines
3.4 KiB
Groff
119 lines
3.4 KiB
Groff
.\" Copyright 1991 The Regents of the University of California.
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.\" 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 the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)cpioformat.5 5.3 (Berkeley) 5/10/91
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.\"
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.Dd May 10, 1991
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.Dt CPIO 5
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.Os
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.Sh NAME
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.Nm cpio
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.Nd format of cpio archive
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.Sh DESCRIPTION
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The header structure, when the
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.Fl c
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option of
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.Xr cpio 1
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is not used, is:
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.Bd -literal -offset indent
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struct {
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short h_magic,
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h_dev;
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ushort h_ino,
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h_mode,
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h_uid,
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h_gid;
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short h_nlink,
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h_rdev,
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h_mtime[2],
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h_namesize,
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h_filesize[2];
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char h_name[h_namesize rounded to word];
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} Hdr;
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.Ed
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.Pp
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When the
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.Fl c
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option is used, the header information is described by:
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.Bd -literal -offset indent
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sscanf(Chdr,"%6o%6o%6o%6o%6o%6o%6o%6o%11lo%6o%11lo%s",
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&Hdr.h_magic, &Hdr.h_dev, &Hdr.h_ino, &Hdr.h_mode,
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&Hdr.h_uid, &Hdr.h_gid, &Hdr.h_nlink, &Hdr.h_rdev,
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&Longtime, &Hdr.h_namesize,&Longfile,Hdr.h_name);
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.Ed
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.Pp
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.Fa Longtime
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and
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.Fa Longfile
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are equivalent to
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.Fa Hdr.h_mtime
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and
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.Fa Hdr.h_filesize ,
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respectively.
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The contents of each file are
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recorded in an element of the array of varying lenght
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structures, archive, together with other items describing
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the file.
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Every instance of
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.Fa h_magic
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contains the constant
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070707 (octal).
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The itimes
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.Fa h_dev
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through
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.Fa h_mtime
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have
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meanings explained in
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.Xr stat 2 .
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The length of the null-terminated path name
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.Fa H_name ,
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icluding the null byte, is
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given by
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.Fa h_namesize .
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.Pp
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The last record of the archive always contains the name
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TRAILER!!!. Special files, directories, and the trailer are
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recorded with
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.Fa H_filesize
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equal to zero.
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.Sh SEE ALSO
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.Xr cpio 1 ,
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.Xr find 1 ,
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.Xr stat 2
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.Sh HISTORY
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A
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.Xr cpio 1
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command appeared in
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.At V .
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This file format is derived from the
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.At V
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sources which were contributed to the public domain by AT&T.
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