CPIO(4)								       CPIO(4)

NAME    [Toc]    [Back]

     cpio - format of cpio archive

DESCRIPTION    [Toc]    [Back]

     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,"%6lo%6lo%6llo%6lo%6lo%6lo%6lo%6lo%11lo%6o%11llo%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,
	 &Hdr.g_mtime, &Hdr.h_namesize,&Hdr.h_filesize,Hdr.h_name);
    Other archive formats (e.g ustar) use other	sscanf strings.
    The	contents of each file are recorded in an element of the	array of
    varying length structures, archive,	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    [Toc]    [Back]

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


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