HP-UX Reference (11i v1 00/12) - 4 File Formats (vol 8)
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STANDARD Printed by: Nora Chuang [nchuang] STANDARD
/build/1111/BRICK/man4/!!!intro.4
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c
cpio(4) cpio(4)
NAME
cpio - format of cpio archive
DESCRIPTION
The header structure, when the -c option of cpio is not used (see cpio(1)), is:
struct {
short c_magic,
c_dev;
ushort c_ino,
c_mode,
c_uid,
c_gid;
short c_nlink,
c_rdev,
c_mtime[2],
c_namesize,
c_filesize[2];
char c_name[c_namesize rounded to word];
} Hdr;
When the cpio -c option is used, the header information is described by:
sscanf(Chdr,"%6ho%6ho%6ho%6ho%6ho%6ho%6ho%6ho%11lo%6ho%11lo",
&Hdr.c_magic,&Hdr.c_dev,&Hdr.c_ino,&Hdr.c_mode,
&Hdr.c_uid,&Hdr.c_gid,&Hdr.c_nlink,&Hdr.c_rdev,
&Longtime,&Hdr.c_namesize,&Longfile);
Longtime and Longfile are equivalent to Hdr.c_mtime and Hdr.c_filesize
, respectively. The con-
tents of each file are recorded together with other items describing the file. Every instance of
c_magic
contains the constant 070707 (octal). The items c_dev through c_mtime have meanings explained in
stat(2). The length of the null-terminated path name
c_name, including the null byte, is given by
c_namesize.
The last record of the archive always contains the name TRAILER!!!. Directories and the trailer are
recorded with c_filesize equal to zero.
It will not always be the case that c_dev and c_ino correspond to the results of stat(), but the
values are always sufficient to tell whether two files in the archive are linked to each other.
When a device special file is archived by
HP-UX cpio (using the -x option), c_rdev contains a magic
constant which is dependent upon the implementation doing the writing.
H_rdev flags the device file as
an
HP-UX 32-bit device specifier, and c_filesize contains the 32-bit device specifier (see stat(2)). If the
-x option is not present, special files are not archived or restored. Non-HPUX device special files are never
restored.
SEE ALSO
cpio(1), find(1), stat(2).
STANDARDS CONFORMANCE
cpio: XPG2, XPG3, XPG4, FIPS 151-2, POSIX.1
Section 4−−40 − 1 − HP-UX Release 11i: December 2000
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