MPE/iX Shell and Utilities Reference Manual, Vol 2

cpio(2) MPE/iX Shell and Utilities cpio(2)

Binary headers contain the same information in 2 byte (short) and 4 byte (long) integers as

shown in Table 2-2.

Bytes Field Name

2 magic

2 dev

2 ino

2 mode

2 uid

2 gid

2 nlink

2 rdev

4 mtime

2 namesize

4 ﬁlesize

Table 2-2: Binary Header Format for cpio File

After this information comes the ﬁle name (with namesize rounded up to the nearest 2 byte

boundary). Then the ﬁle contents appear as in the

ASCII archive. The byte ordering of the 2

and 4 byte integers in the binary format is machine dependent and thus portability of this for-

mat is not easily guaranteed.

Compressed cpio archives are exactly equivalent to the corresponding archive being passed

to a 14-bit compress utility.

PORTABILITY

For maximum portability among different system architectures, only the

ASCII archive format

should be used.