CPIO(4) CPIO(4)
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.
Page 1 May 1989
CPIO(4) CPIO(4)
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
stat(2).
cpio(1), find(1) in the User's Reference Manual.
Page 2 May 1989