CPIO(F)                                    UNIX System V



     Name
          cpio - format of cpio archive


     Description
          The header structure, when the -c option of cpio(C)  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(S).   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(C), find(C), stat(S)


     Standards Conformance
          cpio is conformant with:

          AT&T SVID Issue 2, Select Code 307-127;
          and The X/Open Portability Guide II of January 1987.


     (printed 8/23/89)                                  CPIO(F)