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,"%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);  The
       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  nullterminated
  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.

RELATED INFORMATION    [Toc]    [Back]

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



                                                          cpio(4)