CPIO(4)                                                   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 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
          stat(2).
          cpio(1), find(1) in the User's Reference Manual.

     ORIGIN
          AT&T V.3





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