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Manual page for CPIO(4)

cpio - format of cpio archive

DESCRIPTION

The header structure, when the -c option of cpio(1) is not used, is: 
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;




When the
-c
option is used,
the header information is described by:



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);








Longtime
and
Longfile
are equivalent to
Hdr.h_mtime
and
Hdr.h_filesize,
respectively. 
The contents of each file are recorded
in an element of the array
archive,
of varying length structures,
together with other items describing the file. 
Every instance of
h_magic
contains the constant
070707 (octal). 
The items
h_dev
through
h_mtime
have
meanings explained in
stat(2).
The length of the null-terminated path name
H_name,
including the null byte, is
given by
h_namesize. 


The last record of the archive always contains the name
TRAILER!!!. 
Special files, directories, and the trailer are
recorded with
H_filesize
equal to zero. 

SEE ALSO

cpio(1),
find(1),
stat(2)

HISTORY

A
cpio(1)
command appeared in
AT&T System V UNIX. 
This file format is derived from the
AT&T System V UNIX
sources contributed to the public domain by AT&T. 



	
	

	

	

	


	

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	Last modified 11/5/97