CPIO(4) — Silicon Graphics
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.
SEE ALSO
Version 3.6 — December 20, 1987