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