cpio(4) — sys5



CPIO(4)         DOMAIN/IX Reference Manual (SYS5)         CPIO(4)



NAME
     cpio - format of the 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 struc-
     tures, 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 mean-
     ings 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.

RELATED INFORMATION
     cpio(1), find(1), stat(2)









Printed 5/13/85                                            CPIO-1
Museum
