CPIO(4)                              SysV                              CPIO(4)



NAME
     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 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 pathname 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
     stat(2).
     cpio(1), find(1) in the SysV Command Reference.