1

CPIO(5)                 COMMAND REFERENCE                 CPIO(5)



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.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 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.

CAVEATS
     On some systems, the value of Hdr.h_namesize must be less
     than 128.  On this system, the value is restricted only by
     the maximum length of a pathname (currently 1024).  Care
     must be taken if the cpio archives are to be used on other
     systems.





Printed 10/17/86                                                1

CPIO(5)                 COMMAND REFERENCE                 CPIO(5)



SEE ALSO
     ar(1), cpio(1), find(1), tar(1), stat(2), ar(5), tar(5).





















































Printed 10/17/86                                                2

%%index%%
na:203,65;
de:268,1951;
ca:2219,367;
se:2730,221;
%%index%%000000000083