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.hmtime and
     Hdr.hfilesize, 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 hmagic contains the constant
     070707 (octal).  The items hdev through hmtime have mean-
     ings 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.

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









Printed 5/13/85                                            CPIO-1
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