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.hmtime and
          Hdr.hfilesize, 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 hmagic contains the constant
          070707 (octal).  The items hdev through hmtime have
          meanings explained in stat(2).  The length of the null-
          terminated path name hname, including the null byte, is
          given by hnamesize.

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

     SEE ALSO
          cpio(1), find(1), stat(2).









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